Change Log

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

5.0.0 - 2022-11-24

Breaking Changes

Made ArgPredicate non_exhaustive
(help) Change default Command::term_width to “source format”
(help) Change default Command::max_term_width to 100
(derive) Vec<Vec<T>> types are now assuming to capture occurrences

Features

(derive) Group values by their occurrence with Vec<Vec<T>>

Unreleased - ReleaseDate

4.5.28 - 2025-02-03

Features

(derive) Unstable support for full markdown syntax for doc comments, enabled with unstable-markdown

4.5.27 - 2025-01-20

Documentation

Iterate on tutorials and reference based on feedback

4.5.26 - 2025-01-09

Fixes

(error) Reduce binary size with the suggestions feature

4.5.25 - 2025-01-09

Fixes

(help) Reduce binary size

4.5.24 - 2025-01-07

Fixes

(parser) Correctly handle defaults with ignore_errors(true) and when a suggestion is provided for an unknown argument

4.5.23 - 2024-12-05

Fixes

(parser) When check allow_negative_numbers, allow E again

4.5.22 - 2024-12-03

Fixes

(assert) Catch bugs with arguments requiring themself

4.5.21 - 2024-11-13

Fixes

(parser) Ensure defaults are filled in on error with ignore_errors(true)

4.5.20 - 2024-10-08

Features

(unstable) Add CommandExt

4.5.19 - 2024-10-01

Internal

Update dependencies

4.5.18 - 2024-09-20

Features

(builder) Expose Arg::get_display_order and Command::get_display_order

4.5.17 - 2024-09-04

Fixes

(help) Style required argument groups
(derive) Improve error messages when unsupported fields are used

4.5.16 - 2024-08-15

Fixes

(derive) Improve error messages when derive feature is missing

4.5.15 - 2024-08-10

Compatiblity

(unstable-ext) Arg::remove changed return types

Fixes

(unstable-ext) Make Arg::remove return the removed item

4.5.14 - 2024-08-08

Features

(unstable-ext) Added Arg::add for attaching arbitrary state, like completion hints, to Arg without Arg knowing about it

4.5.13 - 2024-07-31

Fixes

(derive) Improve error message when #[flatten]ing an optional #[group(skip)]
(help) Properly wrap long subcommand descriptions in help

4.5.12 - 2024-07-31

4.5.11 - 2024-07-25

4.5.10 - 2024-07-23

4.5.9 - 2024-07-09

Fixes

(error) When defining a custom help flag, be sure to suggest it like we do the built-in one

4.5.8 - 2024-06-28

Fixes

Reduce extra flushes

4.5.7 - 2024-06-10

Fixes

Clean up error message when too few arguments for num_args

4.5.6 - 2024-06-06

4.5.5 - 2024-06-06

Fixes

Allow exclusive to override required_unless_present, required_unless_present_any, required_unless_present_all

4.5.4 - 2024-03-25

Fixes

(derive) Allow non-literal #[arg(id)] attributes again

4.5.3 - 2024-03-15

Internal

(derive) Update heck

4.5.2 - 2024-03-06

Fixes

(macros) Silence a warning

4.5.1 - 2024-02-16

Fixes

(error) Include suggestion to add -- even if there is a “did you mean” so long as last or trailing_var_arg is used

4.5.0 - 2024-02-08

Compatibility

Update MSRV to 1.74

4.4.18 - 2024-01-16

Fixes

(error) When lacking usage feature, ensure the list of required arguments is unique

4.4.17 - 2024-01-15

Fixes

Fix panic! when mixing args_conflicts_with_subcommands with ArgGroup (which is implicit with derive) introduced in 4.4.15

4.4.16 - 2024-01-12

Fixes

Ensure invalid escape sequences in user-defined strings are correctly stripped when terminal doesn't support color

4.4.15 - 2024-01-11

Fixes

Improve error for args_conflicts_with_subcommands
Ensure we error for args_conflicts_with_subcommands when using subcommand short and long flags

4.4.14 - 2024-01-08

Documentation

Fix find cookbook entry to allow repeats of flags/options

Features

Allow num_args(0) on options which allows making them emulate being a flag for position-tracking flags

4.4.13 - 2024-01-04

Documentation

Fix link to structopt migration guide

4.4.12 - 2023-12-28

Performance

Only ask TypedValueParser for possible values if needed

4.4.11 - 2023-12-04

Features

Add Command::mut_group

4.4.10 - 2023-11-28

Documentation

Link out to changelog
Cross link derive's attribute reference to derive tutorial

4.4.9 - 2023-11-27

Fixes

(help) Show correct Command::about under flattened headings
(help) Respect hide when flattening subcommands

4.4.8 - 2023-11-10

Features

Add Command::flatten_help to allow git stash -h like help for subcommands

4.4.7 - 2023-10-24

Performance

Reduced code size

4.4.6 - 2023-09-28

Internal

Upgrade anstream

4.4.5 - 2023-09-25

Fixes

(parser) When inferring subcommand name or long_flag, allow ambiguous-looking matches that unambiguously map back to the same command
(parser) When inferring subcommand long_flag, don't panic
(assert) Clarify what action is causing a positional that doesn't set values which is especially useful for derive users

4.4.4 - 2023-09-18

Internal

Update terminal_size to 0.3

4.4.3 - 2023-09-12

Documentation

(derive) Clarify use of attributes within the tutorial
Split sections in the builder and derive tutorials into separate modules

4.4.2 - 2023-08-31

Performance

Improve build times by removing once_cell dependency

4.4.1 - 2023-08-28

Features

Stabilize Command::styles

4.4.0 - 2023-08-24

compatibility

update msrv to 1.70.0

4.3.24 - 2023-08-23

Fixes

Ensure column padding is preserved in --help with custom templates

4.3.23 - 2023-08-18

Fixes

Fixed UnknownArgumentValueParser to not error on flag's absence

4.3.22 - 2023-08-17

Features

Add UnknownArgumentValueParser for injecting errors for improving the experience with errors

4.3.21 - 2023-08-08

Features

Expose TryMapValueParser so the type can be named

4.3.20 - 2023-08-08

Features

Command::mut_args for modifying all arguments en masse

4.3.19 - 2023-07-21

Fixes

(parse) Respect value_terminator even in the presence of later multiple-value positional arguments

4.3.18 - 2023-07-21

Fixes

(parse) Suggest -- in fewer places where it won't work

4.3.17 - 2023-07-19

Fixes

(help) Address a regression in wrapping PossibleValue descriptions in --help

4.3.16 - 2023-07-18

Fixes

Don't assert when stateful value parsers fail on defaults (e.g. checking if a path exists)

4.3.15 - 2023-07-18

Features

(unstable-styles) Re-export anstyle

Documentation

(unstable-styles) Provide more examples

4.3.14 - 2023-07-17

Features

ArgAction::HelpShort and ArgAction::HelpLong for explicitly specifying which style of help to display

Fixes

Skip [OPTIONS] in usage if a help or version ArgAction is used

4.3.13 - 2023-07-17

4.3.12 - 2023-07-14

Fixes

(derive) Don't error on enum variant field attributes

4.3.11 - 2023-07-05

Features

(derive) Support fields wrapped in num::Wrapping, Box, or Arc
(derive) Support Box<str>, Box<OsStr>, and Box<Path>

4.3.10 - 2023-06-30

Performance

Drop a dependency, reducing binary size by 1.3 KiB

4.3.9 - 2023-06-28

Fixes

Command::ignore_errors no longer masks help/version

4.3.8 - 2023-06-23

Fixes

Error on ambiguity with infer_long_arg, rather than arbitrarily picking one, matching the documentation and subcommand's behavior

4.3.7 - 2023-06-23

Documentation

Further clarify magic behavior in derive tutorial
Further clarify derive API's relationship to builder within the tutorial

4.3.6 - 2023-06-23

Documentation

Suggest clio

4.3.5 - 2023-06-20

ColorChoice::possible_values is added to simplify things for builder users

Fixes

ColorChoice::to_possible_value no longer includes descriptions, encouraging shorter help where possible

4.3.4 - 2023-06-14

Features

Add Error::exit_code

4.3.3 - 2023-06-09

Features

Command::defer for delayed initialization of subcommands to reduce startup times of large applications like deno

4.3.2 - 2023-06-05

Fixes

(derive) Don't produce unused_equalifications warnings when someone brings a clap type into scope

4.3.1 - 2023-06-02

Performance

(derive) Reduce the amount of generated code

4.3.0 - 2023-05-19

Fixes

(assert) Allow multiple, value-terminated, positional arguments
(assert) Clear up language on last assertion
(parser) Correctly assign values to arguments when using multiple, value-termianted, positional arguments
(parser) Ensure value_terminator has higher precedence than allow_hyphen_values
(help) Only use next-line-help on subcommand list when explicitly specified, not just with --help
(help) Correctly align possible values list
(help) Don't waste code, vertical space in moving possible value descriptions to next line

4.2.7 - 2023-05-02

Fixes

Correctly track remaining length for iterators provided by ArgMatches

4.2.6 - 2023-05-02

Features

impl Eq<std::any::TypeId> for clap_builder::util::AnyValueId

4.2.5 - 2023-04-27

Fixes

Improve panic when a group requires a non-existent ID

4.2.4 - 2023-04-19

Documentation

Corrected docs for Command::style

4.2.3 - 2023-04-18

Features

Command::styles for theming help/errors (behind unstable-styles)

4.2.2 - 2023-04-13

Internal

Update dependencies

4.2.1 - 2023-03-28

Fixes

Don't highlight uninteresting parts of the error message

4.2.0 - 2023-03-28

Compatibility

Removed the languishing unstable-replace feature (open to discussion at #2836)
Removed the stablized unstable-grouped feature

Features

Allow any StyledStr to accept text styled with ANSI escape codes
Respect CLICOLOR, CLICOLOR_FORCE

Fixes

Lighten the tone for “unexpected argument” errors (open to discussion at #4638)

4.1.14 - 2023-03-28

Features

(derive) #[group] raw attribute support

Performance

(derive) clap_builder was pulled out of clap so it could build in parallel to clap_derive
os_str_bytes dependency was removed for faster builds and smaller binaries

4.1.13 - 2023-03-18

Performance

Reduce repeated alloc calls when building a Command
Reduce duplicate dependencies for faster builds

4.1.12 - 2023-03-18

Internal

(derive) Update to syn v2

Performance

(derive) Faster build times by dropping proc-macro-error dependency

4.1.11 - 2023-03-17

Internal

Update bitflags

4.1.10 - 2023-03-17

Fixes

(help) On Windows, avoid underlined text artifacts

4.1.9 - 2023-03-16

Fixes

(assert) Improve the assert when using the wrong action with get_count / get_flag

4.1.8 - 2023-02-27

Fixes

(derive) Don't deny lints on the users behalf

4.1.7 - 2023-02-27

Fixes

(derive) Hide some nightly clippy warnings

4.1.6 - 2023-02-15

Fixes

(help) Don't show long help for --help just because hidden possible values include a description

4.1.5 - 2023-02-15

Fixes

(help) Don't show long help for --help just because a hidden arg has a possible value with a description

4.1.4 - 2023-01-24

Fixes

(help) Respect disable_colored_help when using arg_required_else_help

Performance

Speed up compiling arg! macro

4.1.3 - 2023-01-23

Fixes

(error) Improve suggested flag/value/subcommand when two share a long preifx
(error) When suggesting one of several subcommands, use the plural subcommands, rather than subcommand

4.1.2 - 2023-01-23

Fixes

In documentation, refer to get_flag, rather than get_one::<bool>

4.1.1 - 2023-01-14

Fixes

(error) Small softening attempt for “unexpected argument” error

4.1.0 - 2023-01-13

Compatibility

MSRV changed to 1.64.0

For apps with custom --help and --version flags:

Descriptions for --help and --version changed

When apps have errors imitating clap's error style:

Error message style was changed, including
- Moving away from “did you mean” to tips
- Leading letter is lower case
- “For more” added some punctuation

Features

ArgMatches::get_occurrences support for argument values to be grouped by their occurrence

Fixes

(derive) Allow upgrade_from when arguments / subcommands are explicitly marked as required
(help) Try be more clearer and succinct with --help and --version (also helps with overflow)
(error) Try to be more clearer and succinct with error messages
(error) Officially adopt an error style guide

4.0.32 - 2022-12-22

Fixes

(parser) When overriding required(true), consider args that conflict with its group

4.0.31 - 2022-12-22

Performance

Speed up parsing when a lot of different flags are present (100 unique flags)

4.0.30 - 2022-12-21

Fixes

(error) Improve error for args_conflicts_with_subcommand

4.0.29 - 2022-11-29

4.0.28 - 2022-11-29

Fixes

Fix wasm support which was broken in 4.0.27

4.0.27 - 2022-11-24

Features

Have Arg::value_parser accept Vec<impl Into<PossibleValue>>
Implement Display and FromStr for ColorChoice

Fixes

Remove soundness issue by switching from atty to is-terminal

4.0.26 - 2022-11-16

Fixes

(error) Fix typos in ContextKind::as_str

4.0.25 - 2022-11-15

Features

(error) Report available subcommands when required subcommand is missing

4.0.24 - 2022-11-14

Fixes

Avoid panic when printing an argument that isn't built

4.0.23 - 2022-11-11

Fixes

Don't panic on reporting invalid-long errors when followed by invalid UTF8
(help) Clarified argument to help subcommand

4.0.22 - 2022-11-07

Fixes

(help) Don't overflow into next-line-help early due to stale (pre-v4) padding calculations

4.0.21 - 2022-11-07

Features

(derive) long_about and long_help attributes, without a value, force using doc comment (before it wouldn‘t be set if there wasn’t anything different than the short help)

4.0.20 - 2022-11-07

Fixes

(derive) Allow defaulted value parser for ‘()’ fields

4.0.19 - 2022-11-04

Features

ColorChoice now implements ValueEnum

4.0.18 - 2022-10-20

Fixes

(derive) Allow #[command(skip)] to also work with enum variants with a value

4.0.17 - 2022-10-18

Fixes

Allow using Arg::last(true) with Arg::value_hint(ValueHint::CommandWithArguments)

4.0.16 - 2022-10-18

Fixes

Arg::exclusive(true) should not be exclusive with the argument's own ArgGroup

4.0.15 - 2022-10-13

Fixes

(error) Don‘t suggest -- when it doesn’t help
(error) Be more consistent in quoting, punctuation, and indentation in errors

4.0.14 - 2022-10-12

Fixes

Only put ArgGroup in ArgMatches when explicitly specified, fixing derives handling of option-flattened fields (#4375)

4.0.13 - 2022-10-11

Features

(derive) Allow () for fields to mean “don't read” (#4371)

4.0.12 - 2022-10-10

Features

Added TypedValueParser::try_map for when adapting an existing TypedValueParser can fail
(error) Create errors like clap with Error::new, Error::with_cmd, and Error::insert

4.0.11 - 2022-10-09

Fixes

(help) Fix wrapping calculations with ANSI escape codes

4.0.10 - 2022-10-05

Features

(derive) Support #[arg(flatten)] on Option types (#4211, #4350)

4.0.9 - 2022-10-03

Fixes

(derive) Process doc comments for #[command(subcommand)] like in clap v3

4.0.8 - 2022-10-01

Fixes

(derive) Remove a low-value assert preventing defaulting Help and Version actions

4.0.7 - 2022-09-30

Features

(derive) Populate implicit ArgGroup (#3165)

Fixes

(derive) Support #[group(skip)] on Parser derive
(derive) Tell users about implicit arg groups when running into group name conflicts
(error) Don't report unrelated groups in conflict or requires errors

4.0.6 - 2022-09-30

Features

(derive) Support #[group(skip)] (#4279, #4301)

4.0.5 - 2022-09-30

4.0.4 - 2022-09-29

Fixes

(error) Specialize the self-conflict error to look like clap v3

4.0.3 - 2022-09-29

Fixes

(error) Quote literals consistently
(error) Stylize escape (--) suggestions
(error) Format help flag as a literal

4.0.2 - 2022-09-28

Fixes

(parser) SetFalse should conflict with itself like SetTrue and Set
(parser) Allow one-off overrides

4.0.1 - 2022-09-28

Fixes

(derive) Ensure #[clap(...)] attribute still works

4.0.0 - 2022-09-28

Highlights

Arg::num_args(range)

Clap has had several ways for controlling how many values will be captured without always being clear on how they interacted, including

Arg::multiple_values(true)
Arg::number_of_values(4)
Arg::min_values(2)
Arg::max_values(20)
Arg::takes_value(true)

These have now all been collapsed into Arg::num_args which accepts both single values and ranges of values. num_args controls how many raw arguments on the command line will be captured as values per occurrence and independent of value delimiters.

See Issue 2688 for more background.

Polishing Help

Clap strives to give a polished CLI experience out of the box with little ceremony. With some feedback that has accumulated over time, we took this release as an opportunity to re-evaluate our --help output to make sure it is meeting that goal.

In doing this evaluation, we wanted to keep in mind:

Whether other CLIs had ideas that make sense to apply
Providing an experience that fits within the rest of applications and works across all shells

Before:

git
A fictional versioning CLI

USAGE:
    git <SUBCOMMAND>

OPTIONS:
    -h, --help    Print help information

SUBCOMMANDS:
    add      adds things
    clone    Clones repos
    help     Print this message or the help of the given subcommand(s)
    push     pushes things
    stash

After:

A fictional versioning CLI

Usage: git <COMMAND>

Commands:
  clone  Clones repos
  push   pushes things
  add    adds things
  stash
  help   Print this message or the help of the given subcommand(s)

Options:
  -h, --help  Print help information

name/version header was removed because we couldn't justify the space it occupied when
- Usage already includes the name
- --version is available for showing the same thing (if the program has a version set)
Usage was dropped to one line to save space
Focus is put on the subcommands
Headings are now Title case
The more general term “command” is used rather than being explicit about being “subcommands”
The output is more dense with the expectation that it won't affect legibility but will allow more content
We've moved to a more neutral palette for highlighting elements (not highlighted above)

In talking to users, we found some that liked clap‘s man-like experience. When deviating from this, we are making the assumption that those are more power users and that the majority of users wouldn’t look as favorably on being consistent with man.

See Issue 4132 for more background.

More Dynamicism

Clap's API has focused on &str for performance but this can make dealing with owned data difficult, like #[arg(default_value_t)] generating a String from the default value.

Additionally, to avoid ArgMatches from borrowing (and for some features we decided to forgo), clap took the &str argument IDs and hashed them. This prevented us from providing a usable API for iterating over existing arguments.

Now clap has switched to a string newtype that gives us the flexibility to decide whether to use &'static str, Cow<'static, str> for fast dynamic behavior, or Box<str> for dynamic behavior with small binary size.

As an extension of that work, you can now call ArgMatches::ids to iterate over the arguments and groups that were found when parsing. The newtype Id was used to prevent some classes of bugs and to make it easier to understand when opaque Ids are used vs user-visible strings.

Clearing Out Deprecations

Instead of doing all development on clap 4.0.0, we implemented a lot of new features during clap 3's development, deprecating the old API while introducing the new API, including:

Replacing the implicit behavior for args when parsing them with ArgAction
Replacing various one-off forms of value validation with the ValueParser API
- Allowing derives to automatically do the right thing for PathBuf (allowing invalid UTF-8)
Replacing AppSettings and ArgSettings enums with getters/setters
Clarifying terms and making them more consistent

Migrating

Steps:

Upgrade to v3 if you haven't already
Add CLI tests (including example below), -h and --help output at a minimum (recommendation: trycmd for snapshot testing)
If using Builder API: Explicitly set the arg.action(ArgAction::...) on each argument (StoreValue for options and IncOccurrences for flags)
Run cargo check --features clap/deprecated and resolve all deprecation warnings
Upgrade to v4
Update feature flags

If default-features = false, run cargo add clap -F help,usage,error-context
Run cargo add clap -F wrap_help unless you want to hard code line wraps

Resolve compiler errors
Resolve behavior changes (see “subtle changes” under BREAKING CHANGES)
At your leisure: resolve new deprecation notices

Example test (derive):

#[derive(clap::Parser)]
struct Cli {
    ...
}

#[test]
fn verify_cli() {
    use clap::CommandFactory;
    Cli::command().debug_assert()
}

Example test (builder):

fn cli() -> clap::Command {
    ...
}

#[test]
fn verify_cli() {
    cli().debug_assert();
}

Note: the idiomatic / recommended way of specifying different types of args in the Builder API has changed:

Before

.arg(Arg::new("flag").long("flag"))  # --flag
.arg(Arg::new("option").long("option").takes_value(true))  # --option <option>

After:

.arg(Arg::new("flag").long("flag").action(ArgAction::SetTrue))  # --flag
.arg(Arg::new("option").long("option"))  # --option <option>

In particular, num_args (the replacement for takes_value) will default appropriately from the ArgAction and generally only needs to be set explicitly for the other num_args use cases.

Breaking Changes

Subtle changes (i.e. compiler won't catch):

arg! now sets one of (#3795):
- ArgAction::SetTrue, requiring ArgMatches::get_flag instead of ArgMatches::is_present
- ArgAction::Count, requiring ArgMatches::get_count instead of ArgMatches::occurrences_of
- ArgAction::Set, requiring ArgMatches::get_one instead of ArgMatches::value_of
- ArgAction::Append, requiring ArgMatches::get_many instead of ArgMatches::values_of
ArgAction::Set, ArgAction::SetTrue, and Arg::Action::SetFalse now conflict by default to be like ArgAction::StoreValue and ArgAction::IncOccurrences, requiring cmd.args_override_self(true) to override instead (#4261)
By default, an Args default action is ArgAction::Set, rather than ArgAction::IncOccurrence to reduce confusing magic through consistency (#2687, #4032, see also #3977)
mut_arg can no longer be used to customize help and version arguments, instead disable them (Command::disable_help_flag, Command::disable_version_flag) and provide your own (#4056)
Removed lifetimes from Command, Arg, ArgGroup, and PossibleValue, assuming 'static. string feature flag will enable support for Strings (#1041, #2150, #4223)
arg!(--flag <value>) is now optional, instead of required. Add .required(true) at the end to restore the original behavior (#4206)
Added default feature flags, help, usage and error-context, requiring adding them back in if default-features = false (#4236)
(parser) Always fill in "" argument for external subcommands to make it easier to distinguish them from built-in commands (#3263)
(parser) Short flags now have higher precedence than hyphen values with Arg::allow_hyphen_values, to be consistent with Command::allow_hyphen_values (#4187)
(parser) Arg::value_terminator must be its own argument on the CLI rather than being in a delimited list (#4025)
(help) Line wrapping of help is now behind the existing wrap_help feature flag, either enable it or hard code your wraps (#4258)
(help) Make DeriveDisplayOrder the default and removed the setting. To sort help, set next_display_order(None) (#2808)
(help) Subcommand display order respects Command::next_display_order instead of DeriveDisplayOrder and using its own initial display order value (#2808)
(help) Subcommands are now listed before arguments. To get the old behavior, see Command::help_template (#4132)
(help) Help headings are now title cased, making any user-provided help headings inconsistent. To get the old behavior, see Command::help_template, Arg::help_heading, and Command::subcommand_help_heading (#4132)
(help) “Command” is used as the section heading for subcommands and COMMAND for the value name. To get the old behavior, see Command::subcommand_help_heading and Arg::subcommand_value_name (#4132, #4155)
(help) Whitespace in help output is now trimmed to ensure consistency regardless of how well a template matches the users needs. (#4132, #4156)
(help) name/version/author are removed by default from help output. To get the old behavior, see Command::help_template. (#4132, #4160)
(help) Indentation for second-line usage changed. (#4132, #4188)
(env) Parse --help and --version like any ArgAction::SetTrue flag (#3776)
(derive) Leave Arg::id as verbatim casing, requiring updating of string references to other args like in conflicts_with or requires (#3282)
(derive) Doc comments for ValueEnum variants will now show up in --help (#3312)
(derive) When deriving Args, and ArgGroup is created using the type's name, reserving it for future use (#2621, #4209)
(derive) next_help_heading can now leak out of a #[clap(flatten)], like all other command settings (#4222)

Easier to catch changes:

Looking up a group in ArgMatches now returns the arg Ids, rather than the values to reduce overhead and offer more flexibility. (#4072)
Changed Arg::number_of_values (average-across-occurrences) to Arg::num_args (per-occurrence) (raw CLI args, not parsed values) (#2688, #4023)
- num_args(0) no longer implies takes_value(true).multiple_values(true) (#4023)
- num_args(1) no longer implies multiple_values(true) (#4023)
- Does not check default or env values, only what the user explicitly passes in (#4025)
- No longer terminates on delimited values (#4025)
Replace Arg::min_values (across all occurrences) with Arg::num_args(N..) (per occurrence) to reduce confusion over different value count APIs (#4023)
Replace Arg::max_values (across all occurrences) with Arg::num_args(1..=M) (per occurrence) to reduce confusion over different value count APIs (#4023)
Replace Arg::multiple_values(true) with Arg::num_args(1..) and Arg::multiple_values(false) with Arg::num_args(0) to reduce confusion over different value count APIs (#4023)
Replace Arg::takes_value(true) with Arg::num_args(1) and Arg::takes_value(false) with Arg::num_args(0) to reduce confusion over different value count APIs
Remove Arg::require_value_delimiter, either users could use Arg::value_delimiter or implement a custom parser with TypedValueParser as it was mostly to make multiple_values(true) act like multiple_values(false) and isn't needed anymore (#4026)
Arg::new("help") and Arg::new("version") no longer implicitly disable the built-in flags and be copied to all subcommands, instead disable the built-in flags (Command::disable_help_flag, Command::disable_version_flag) and mark the custom flags as global(true). (#4056)
Arg::short('h') no longer implicitly disables the short flag for help, instead disable the built-in flags (Command::disable_help_flag, Command::disable_version_flag) provide your own Arg::new("help").long("help").action(ArgAction::Help).global(true). (#4056)
ArgAction::SetTrue and ArgAction::SetFalse now prioritize Arg::default_missing_value over their standard behavior (#4000)
Changed Arg::requires_ifs and Arg::default_value*_ifs* to taking an ArgPredicate, removing ambiguity with None when accepting owned and borrowed types (#4084)
Removed PartialEq and Eq from Command so we could change external subcommands to use a ValueParser (#3990)
Various Arg, Command, and ArgGroup calls were switched from accepting &[] to [] via IntoIterator to be more flexible (#4072)
Arg::short_aliases and other builder functions that took &[] need the & dropped (#4081)
ErrorKind and Result moved into the error module
ErrorKind::EmptyValue replaced with ErrorKind::InvalidValue to remove an unnecessary special case (#3676, #3968)
ErrorKind::UnrecognizedSubcommand replaced with ErrorKind::InvalidSubcommand to remove an unnecessary special case (#3676)
Changed the default type of allow_external_subcommands from String to OsString as that is less likely to cause bugs in user applications (#3990)
(help) Command::render_usage now returns a StyledStr (#4248)
(derive) Changed the default for arguments from parse to value_parser, removing parse support (#3827, #3981)
- #[clap(value_parser)] and #[clap(action)] are now redundant
(derive) subcommand_required(true).arg_required_else_help(true) is set instead of SubcommandRequiredElseHelp to give more meaningful errors when subcommands are missing and to reduce redundancy (#3280)
(derive) Remove arg_enum attribute in favor of value_enum to match the new name (we didn't have support in v3 to mark it deprecated) (#4127)
(parser) Assert when the CLI looksup an unknown args when external subcommand support is enabled to help catch bugs (#3703)
(assert) Sometimes Arg::default_missing_value didn't require num_args(0..=N), now it does (#4023)
(assert) Leading dashes in Arg::long are no longer allowed (#3691)
(assert) Disallow more value_names than num_args (#2695)
(assert) Always enforce that version is specified when the ArgAction::Version is used
(assert) Add missing #[track_caller]s to make it easier to debug asserts
(assert) Ensure overrides_with IDs are valid
(assert) Ensure no self-overrides_with now that Actions replace it
(assert) Ensure subcommand names are not duplicated
(assert) Assert on mut_arg receiving an invalid arg ID or mut_subcommand receiving an invalid command name

Compatibility

MSRV is now 1.60.0

Deprecated

Arg::use_value_delimiter in favor of Arg::value_delimiter to avoid having multiple ways of doing the same thing
Arg::requires_all in favor of Arg::requires_ifs now that it takes an ArgPredicate to avoid having multiple ways of doing the same thing
Arg::number_of_values in favor of Arg::num_args to clarify semantic differences
default_value_os, default_values_os, default_value_if_os, and default_value_ifs_os as the non _os variants now accept either a str or an OsStr (#4141)
Arg::env_os in favor of Arg::env
Command::dont_collapse_args_in_usage is now the default (#4151)
Command::trailing_var_arg in favor of Arg::trailing_var_arg to make it clearer which arg it is meant to apply to (#4187)
Command::allow_hyphen_values in favor of Arg::allow_hyphen_values to make it clearer which arg it is meant to apply to (#4187)
Command::allow_negative_numbers in favor of Arg::allow_negative_numbers to make it clearer which arg it is meant to apply to (#4187)
(help) Deprecated Command::write_help and Command::write_long_help in favor of Command::render_help and Command::render_long_help (#4248)
(derive) structopt and clap attributes in favor of the more specific command, arg, and value to open the door for more features and clarify relationship to the builder (#1807, #4180)
(derive) #[clap(value_parser)] and #[clap(action)] defaulted attributes (its the default) (#3976)

Behavior Changes

(help) With wrap_help feature, if the terminal size cannot be determined, LINES and COLUMNS variables are used (#4186)

Features

Arg::num_args now accepts ranges, allowing setting both the minimum and maximum number of values per occurrence (#2688, #4023)
Allow non-bool value_parsers for ArgAction::SetTrue / ArgAction::SetFalse (#4092)
Add From<&OsStr>, From<OsString>, From<&str>, and From<String> to value_parser! (#4257)
Allow resetting most builder methods
Can now pass runtime generated data to Command, Arg, ArgGroup, PossibleValue, etc without managing lifetimes with the string feature flag (#2150, #4223)
New default error-context, help and usage feature flags that can be turned off for smaller binaries (#4236)
Added StyledStr::ansi() to Display with ANSI escape codes (#4248)
(error) Error::apply for changing the formatter for dropping binary size (#4111)
(error) Error::renderfor formatting the error into a StyledStr
(help) Show PossibleValue::help in long help (--help) (#3312)
(help) New {tab} variable for Command::help_template (#4161)
(help) Command::render_help and Command::render_long_help for formatting the error into a StyledStr (#3873, #4248)
(help) Command::render_usage now returns a StyledStr (#4248)

Fixes

Verify required is not used with conditional required settings (#3660)
Replaced cmd.allow_invalid_for_utf8_external_subcommands with cmd.external_subcommand_value_parser (#3733)
Arg::default_missing_value now applies per occurrence rather than if a value is missing across all occurrences (#3998)
arg!(--long [value]) to accept 0..=1 per occurrence rather than across all occurrences, making it safe to use with ArgAction::Append (#4001)
Allow OsStrs for Arg::{required_if_eq,required_if_eq_any,required_if_eq_all} (#4084)
(help) With wrap_help feature, if the terminal size cannot be determined, LINES and COLUMNS variables are used (#4186)
(help) Use Command::display_name in the help title rather than Command::bin_name
(help) Show when a flag is ArgAction::Count by adding an ... (#4003)
(help) Use a more neutral palette for coloring (#4132, #4117)
(help) Don't rely on ALL CAPS for help headers (#4132, #4123)
(help) List subcommands first, focusing the emphasis on them (#4132, #4125)
(help) Do not include global args in cmd help help (#4131)
(help) Use [positional] in list when relevant (#4144)
(help) Show all [positional] in usage (#4151)
(help) Polish up subcommands by referring to them as commands (#4132, #4155)
(help) Trim extra whitespace to avoid artifacts from different uses of templates (#4132, #4156)
(help) Hint to the user the difference between -h / --help when applicable (#4132, #4159)
(help) Shorten help by eliding name/version/author (#4132, #4160)
(help) When short help is long enough to activate next_line_help, don't add blank lines (#4132, #4190)
(help) Make help output more dense (reducing horizontal whitespace) (#4132, #4192)
(help) Separate subcommand flags with “,” like option flags (#4232, #4235)
(help) Quote the suggested help flag (#4220)
(version) Use Command::display_name rather than Command::bin_name (#3966)
(parser) Always fill in "" argument for external subcommands (#3263)
(parser) Short flags now have higher precedence than hyphen values with Arg::allow_hyphen_values, like Command::allow_hyphen_values (#4187)
(parser) Prefer InvalidSubcommand over UnknownArgument in more cases (#4219)
(derive) Detect escaped external subcommands that look like built-in subcommands (#3703)
(derive) Leave Arg::id as verbatim casing (#3282)
(derive) Default to #[clap(value_parser, action)] instead of #[clap(parse)] (#3827)

3.2.18 - 2022-08-29

Fixes

(help) Command::print_help now respects Command::colored_help
(derive) Improved error messages

3.2.17 - 2022-08-12

Fixes

(derive) Expose #[clap(id = ...)] attribute to match Arg's latest API

3.2.16 - 2022-07-30

Fixes

Ensure required arguments appear in errors when they are also members of a group (#4004)

3.2.15 - 2022-07-25

Features

(derive) New default_values_t and default_values_os_t attributes

3.2.14 - 2022-07-21

Fixes

A multiple_values positional followed by another positional now works with multiple flags

3.2.13 - 2022-07-19

Documentation

Pulled in tutorials, cookbook, and derive reference into rustdoc

3.2.12 - 2022-07-14

Fixes

Allow an arg to declare a conflict with a group

3.2.11 - 2022-07-13

Features

Added Arg::get_all_short_aliaes and Arg::get_all_aliases

3.2.10 - 2022-07-12

Fixes

Loosen lifetime on Command::mut_subcommand

3.2.8 - 2022-06-30

Features

Added Command::mut_subcommand to mirror Command::mut_arg

3.2.7 - 2022-06-28

Fixes

Global arguments should override env-sourced arguments

3.2.6 - 2022-06-21

Fixes

Don't panic when parsing --=

3.2.5 - 2022-06-15

Fixes

(derive) Fix regression with #[clap(default_value_os_t ...)] introduced in v3.2.3

3.2.4 - 2022-06-14

Fixes

(derive) Provide more clearer deprecation messages for #[clap(parse)] attribute (#3832)

3.2.3 - 2022-06-14

Fixes

Moved deprecations to be behind the deprecated Cargo.toml feature (#3830)
- For now, it is disabled by default though we are considering enabling it by default as we release the next major version to help draw attention to the deprecation migration path

3.2.2 - 2022-06-14

Fixes

(derive) Improve the highlighted code for deprecation warnings

gated behind unstable-v4

(derive) Default to #[clap(value_parser, action)] instead of #[clap(parse)] (#3827)

3.2.1 - 2022-06-13

3.2.0 - 2022-06-13

Compatibility

MSRV is now 1.56.0 (#3732)

Behavior

Defaults no longer satisfy required and its variants (#3793)
When misusing ArgMatches::value_of and friends, debug asserts were turned into panics

Moving (old location deprecated)

clap::{PossibleValue, ValueHint} to clap::builder::{PossibleValue, ValueHint}
clap::{Indices, OsValues, ValueSource, Values} to clap::parser::{Indices, OsValues, ValueSource, Values}
clap::ArgEnum to clap::ValueEnum (#3799)

Replaced

Arg::allow_invalid_utf8 with Arg::value_parser(value_parser!(PathBuf)) (#3753)
Arg::validator / Arg::validator_os with Arg::value_parser (#3753)
Arg::validator_regex with users providing their own builder::TypedValueParser (#3756)
Arg::forbid_empty_values with builder::NonEmptyStringValueParser / builder::PathBufValueParser (#3753)
Arg::possible_values with Arg::value_parser([...]), builder::PossibleValuesParser, or builder::EnumValueParser (#3753)
Arg::max_occurrences with arg.action(ArgAction::Count).value_parser(value_parser!(u8).range(..N)) for flags (#3797)
Arg::multiple_occurrences with ArgAction::Append or ArgAction::Count though positionals will need Arg::multiple_values (#3772, #3797)
Command::args_override_self with ArgAction::Set (#2627, #3797)
AppSettings::NoAutoVersion with ArgAction or Command::disable_version_flag (#3800)
AppSettings::NoHelpVersion with ArgAction or Command::disable_help_flag / Command::disable_help_subcommand (#3800)
ArgMatches::{value_of, value_of_os, value_of_os_lossy, value_of_t} with ArgMatches::{get_one,remove_one} (#3753)
ArgMatches::{values_of, values_of_os, values_of_os_lossy, values_of_t} with ArgMatches::{get_many,remove_many} (#3753)
ArgMatches::is_valid_arg with ArgMatches::{try_get_one,try_get_many} (#3753)
ArgMatches::occurrences_of with ArgMatches::value_source or ArgAction::Count (#3797)
ArgMatches::is_present with ArgMatches::contains_id or ArgAction::SetTrue (#3797)
ArgAction::StoreValue with ArgAction::Set or ArgAction::Append (#3797)
ArgAction::IncOccurrences with ArgAction::SetTrue or ArgAction::Count (#3797)
(derive) #[clap(parse(...))] replaced with: (#3589, #3794)
- For default parsers (no parse attribute), deprecation warnings can be silenced by opting into the new behavior by adding either #[clap(action)] or #[clap(value_parser)] (ie requesting the default behavior for these attributes). Alternatively, the unstable-v4 feature changes the default away from parse to action/value_parser.
- For #[clap(parse(from_flag))] replaced with #[clap(action = ArgAction::SetTrue)] (#3794)
- For #[clap(parse(from_occurrences))] replaced with #[clap(action = ArgAction::Count)] though the field's type must be u8 (#3794)
- For #[clap(parse(from_os_str)] for PathBuf, replace it with #[clap(value_parser)] (as mentioned earlier this will call value_parser!(PathBuf) which will auto-select the right ValueParser automatically).
- For #[clap(parse(try_from_str = ...)], replace it with #[clap(value_parser = ...)]
- For most other cases, a type implementing TypedValueParser will be needed and specify it with #[clap(value_parser = ...)]

Features

Parsed, typed arguments via Arg::value_parser / ArgMatches::{get_one,get_many} (#2683, #3732)
- Several built-in TypedValueParsers available with an API open for expansion
- value_parser!(T) macro for selecting a parser for a given type (#3732) and open to expansion via the ValueParserFactory trait (#3755)
- [&str] is implicitly a value parser for possible values
- All ArgMatches getters do not assume required arguments (#2505)
- Add ArgMatches::remove_* variants to transfer ownership
- Add ArgMatches::try_* variants to avoid panics for developer errors (#3621)
- Add a get_raw to access the underlying OsStrs
- PathBuf value parsers imply ValueHint::AnyPath for completions (#3732)
Explicit control over parsing via Arg::action (#3774)
- ArgAction::StoreValue: existing takes_value(true) behavior
- ArgAction::IncOccurrences: existing takes_value(false) behavior
- ArgAction::Help: existing --help behavior
- ArgAction::Version: existing --version behavior
- ArgAction::Set: Overwrite existing values (like Arg::multiple_occurrences mixed with Command::args_override_self) (#3777)
- ArgAction::Append: like Arg::multiple_occurrences (#3777)
- ArgAction::SetTrue: Treat --flag as --flag=true (#3775)
  - Implies Arg::default_value("false") (#3786)
  - Parses Arg::env via Arg::value_parser
- ArgAction::SetFalse: Treat --flag as --flag=false (#3775)
  - Implies Arg::default_value("true") (#3786)
  - Parses Arg::env via Arg::value_parser
- ArgAction::Count: Treat --flag --flag --flag as --flag=1 --flag=2 --flag=3 (#3775)
  - Implies Arg::default_value("0") (#3786)
  - Parses Arg::env via Arg::value_parser
(derive) Opt-in to new Arg::value_parser / Arg::action with either #[clap(value_parser)] (#3589, #3742) / #[clap(action)] attributes (#3794)
- Default ValueParser is determined by value_parser! (#3199, #3496)
- Default ArgAction is determine by a hard-coded lookup on the type (#3794)
Command::multicall is now stable for busybox-like programs and REPLs (#2861, #3684)
ArgMatches::{try_,}contains_id for checking if there are values for an argument that mirrors the new get_{one,many} API

Fixes

Don't correct argument id in default_value_ifs_os(#3815)

parser

Set ArgMatches::value_source and ArgMatches::occurrences_of for external subcommands (#3732)
Use value delimiter for Arg::default_missing_values (#3761, #3765)
SplitArg::default_value / Arg::env on value delimiters independent of whether -- was used (#3765)
Allow applying defaults to flags (#3294, 3775)
Defaults no longer satisfy required and its variants (#3793)

3.1.18 - 2022-05-10

Fixes

Fix deprecated arg_enum! for users migrating to clap3 (#3717)
Verify all required_unless_present_all arguments exist
Verify group members exist before processing group members (#3711)
(help) Use ... when not enough value_names are supplied

gated behind unstable-v4

Verify required is not used with conditional required settings (#3660)
Disallow more value_names than number_of_values (#2695)
(parser) Assert on unknown args when using external subcommands (#3703)
(parser) Always fill in "" argument for external subcommands (#3263)
(derive) Detect escaped external subcommands that look like built-in subcommands (#3703)
(derive) Leave Arg::id as verbatim casing (#3282)

3.1.17 - 2022-05-06

Fixes

Allow value names for arg! macro to have dashes when quoted, like longs

3.1.16 - 2022-05-06

Fixes

(parser) Arg::exclusive overrides Arg::required, like other conflicts
(error) Don't duplicate arguments in usage
(error) Don't show hidden arguments in conflict error usage
(help) New help_template variable {name} to fix problems with {bin}
(help) Don't wrap URLs

gated behind unstable-v4

Leading dashes in Arg::long are no longer allowed
(help) Use Command::display_name in the help title rather than Command::bin_name

3.1.15 - 2022-05-02

Fixes

(error) Render actual usage for unrecognized subcommands
(multicall) Improve bad command error
(multicall) Always require a multicall command
(multicall) Disallow arguments on multicall parent command
(multicall) More consistent with rest of clap errors

3.1.14 - 2022-05-01

Fixes

Panic when calling Command::build with a required positional argument nested several layers in subcommands

3.1.13 - 2022-04-30

Fixes

Help subcommand and Command::write_help now report required arguments in usage in more circumstances
Unknown subcommand for help subcommand flag now reports an error with more context
More details reported when using debug feature
Allow disabling color feature with debug feature enabled

3.1.12 - 2022-04-22

Fixes

Regression in 3.1.11 where the (output) streams were crossed

3.1.11 - 2022-04-22

Fixes

Implied conflicts override Arg::required, making the behavior consistent with how we calculate conflicts for error reporting
Members of a mutually exclusive ArgGroup override Arg::required, making the behavior consistent with how we calculate conflicts for error reporting
Arg::overrides_with always override Arg::required, not just when the parser processes an override

3.1.10 - 2022-04-19

Features

Expose Command::build for custom help generation or other command introspection needs

3.1.9 - 2022-04-15

Fixes

Pin the clap_derive version so a compatible version is always used with clap

3.1.8 - 2022-04-01

Fixes

Add Debug impls to more types

3.1.7 - 2022-03-31

Fixes

(derive) Abort, rather than ignore, when deriving ArgEnum with non-unit unskipped variants

3.1.6 - 2022-03-07

Fixes

Don't panic when validating delimited defaults (#3541)
Make it clearer that cargo feature is needed
Documentation improvements

3.1.5 - 2022-03-02

Fixes

Dependency upgrade

3.1.4 - 2022-03-02

Features

(help) Show PossibleValue::help in long help (--help) (gated behind unstable-v4) (#3312)

3.1.3 - 2022-02-28

Fixes

Don't panic when validating delimited defaults (#3514)

3.1.2 - 2022-02-23

Fixes

(derive) Allow other attribute with a subcommand that has subcommands

Documentation

(examples) List example topics
(derive) Clarify syntax and relation to builder API

3.1.1 - 2022-02-21

Fixes

Track caller for ArgMatches assertions so the user more easily sees where they need to fix the call

3.1.0 - 2022-02-16

Compatibility

Changes in behavior of note that are not guaranteed to be compatible across releases:

(help) help subcommand shows long help like --help, rather than short help (-h), deprecated clap::AppSettings::UseLongFormatForHelpSubcommand (#3440)
(help) Pacman-style subcommands are now ordered the same as usage errors (#3470)
(help) Pacman-style subcommands use standard alternate syntax in usage (#3470)

Deprecations

clap::Command is now preferred over clap::App (#3089 in #3472)
- clap::command! is now preferred over clap::app_from_crate (#3089 in #3474)
- clap::CommandFactory::command is now preferred over clap::IntoApp::into_app (#3089 in #3473)
(help) help subcommand shows long help like --help, rather than short help (-h), deprecated clap::AppSettings::UseLongFormatForHelpSubcommand (#3440)
(error) Deprecate clap::AppSettings::WaitOnError, leaving it to the user to implement
(validation) clap::Command::subcommand_required(true).arg_required_else_help(true) is now preferred over clap::AppSettings::SubcommandRequiredElseHelp (#3280)
(builder) clap::AppSettings are nearly all deprecated and replaced with builder methods and getters (#2717)
(builder) clap::ArgSettings is deprecated and replaced with builder methods and getters (#2717)
(builder) clap::Arg::id and clap::ArgGroup::id are now preferred over clap::Arg::name and clap::ArgGroup::name (#3335)
(help) clap::Command::next_help_heading is now preferred over clap::Command::help_heading (#1807, #1553)
(error) clap::error::ErrorKind is now preferred over clap::ErrorKind (#3395)
(error) clap::Error::kind() is now preferred over clap::Error::kind
(error) clap::Error::context() is now preferred over clap::Error::info (#2628)

Note: All items deprecated in 3.0.0 are now hidden in the documentation. (#3458)

Features

(matches) Add clap::ArgMatches::value_source to determine what insert the value (#1345)
(help) Override derived display order with clap::Command::next_display_order (#1807)
(error) Show possible values when an argument doesn't have a value (#3320)
(error) New clap::Error::context API to open the door for fully-custom error messages (#2628)
- (error) clap::error::ErrorKind now implements Display

Fixes

(builder) Some functions were renamed for consistency and fixing spelling issues
(builder) Allow clap::Command::color to override previous calls (#3449)
(parse) Propagate globals with multiple subcommands (#3428)
(validation) Give ArgRequiredElseHelp precedence over SubcommandRequired (#3456)
(validation) Default values no longer count as “present” for conflicts, requires, clap::Command::arg_required_else_help, etc (#3076, #1264)
(assert) Report invalid defaults (#3202)
(help) Clarify how to handle -h conflicts (#3403)
(help) Make it easier to debug the addition of help flags (#3425)
(help) Pacman-style subcommands are now separated with spaces (#3470)
(help) Pacman-style subcommands are now ordered the same as usage errors (#3470)
(help) Pacman-style subcommands use standard alternate syntax in usage (#3470)
(error) Be consistent in showing of required attributes between errors / usage (#3390)
(error) Show user's order of possible values, like in --help (#1549)
(error) Allow customizing error type in clap::error::Result (#3395)

Performance

(error) Reduced stack size of clap::Error (#3395)

Documentation

(builder) Correct data take accepted for clap::Arg::validator
(derive) Clarify parse attribute
(tutorial) Demonstrate custom parsing
(example) Consistently list out required feature flags (#3448)

3.0.14 - 2022-02-01

Features

Added ArgMatches::args_present() to check if any args are present
Added Error::kind() as we work to deprecate direct member access for Error
Added App::get_version
Added App::get_long_version
Added App::get_author
Added App::get_subcommand_help_heading
Added App::get_subcommand_value_name
Added App::get_after_help
Added App::get_after_long_help

Performance

Misc binary size reductions

3.0.13 - 2022-01-26

Fixes

Show optional flag values wrapped in []

3.0.12 - 2022-01-24

Features

(derive) Support for default_value_os_t

3.0.11 - 2022-01-24

Fixes

Ensure conflicts work when they target a group with a default value

3.0.10 - 2022-01-18

Fixes

Resolve panic! from v3.0.8 when using global_setting(PropagateVersion).

3.0.9 - 2022-01-17

Features

Added App::find_subcommand_mut

3.0.8 - 2022-01-17

Fixes

Respected DisableColoredHelp on cmd help help
Provide a little more context when completing arguments for cmd help
Provide more context for some asserts
Small documentation improvements

3.0.7 - 2022-01-12

Fixes

Shift more asserts from parsing to App building (ie will now run in App::debug_assert)

derive

Documentation fixes

3.0.6 - 2022-01-10

Fixes

derive

Don't assume user does use clap::ArgEnum (#3277)
Documentation fixes

3.0.5 - 2022-01-05

Fixes

Provide hack to workaround inability to detect external subcommands aliasing when escaped (#3264)

docs:

Cleaned up code blocks in tutorials (#3261)
Clean up quotes in ArgMatches asserts
List correct replacement for deprecated Parser::from_clap (#3257)

3.0.4 - 2022-01-04

Features

For very limited cases, like cargo, expose ArgMatches::is_valid_arg to avoid panicing on undefined arguments

3.0.3 - 2022-01-04

Fixes

Specify cause of debug assert failure

3.0.2 - 2022-01-04

Fixes

Ignore Last when checking hyphen values (see #3249 for details)
Help catch bugs with #[must_use]

3.0.1 - 2022-01-03

Fixes

Don't panic when getting number of values (#3241)
Don't warn when using default_value_t derive attribute with a Subcommand (#3245)

Documentation

Added name attribute to ArgEnum variant derive reference

3.0.0 - 2021-12-31

Note: clap v3 has been in development for several years and has changed hands multiple times. Unfortunately, our changelog might be incomplete, whether in changes or their motivation.

Highlights

A special thanks to the maintainers, contributors, beta users, and sponsors who have helped along this journey, especially kbknapp.

StructOpt Integration

StructOpt provides a serde-like declarative approach to defining your parser. The main benefits we've seen so far from integrating are:

Tighter feedback between the design of clap and the derives
More universal traits. Crates exist for common CLI patterns (example) and we‘ve re-designed the StructOpt traits so crates built on clap3 can be reused not just with other derives but also people using the builder API. People can even hand implement these so people using the builder API won’t have the pay the cost for derives.

Custom Help Headings

Previously, clap automatically grouped arguments in the help as either ARGS, FLAGS, OPTIONS, and SUBCOMMANDS.

You can now override the default group with Arg::help_heading and App::subcommand_help_heading. To apply a heading to a series of arguments, you can set App::help_heading.

Deprecations

While a lot of deprecations have been added to clean up the API (overloaded meaning of Arg::multiple) or make things more consistent, some particular highlights are:

clap_app! has been deprecated in favor of the builder API with arg! (clap-rs/clap#2835)
Arg::from_usage has been deprecated in favor of arg! (clap-rs/clap#3087)
- Porting example
The YAML API has been deprecated in favor the builder or derive APIs (clap-rs/clap#3087)

Migrating

From clap v2

Add CLI tests, -h and --help output at a minimum (recommendation: trycmd for snapshot testing)
Update your dependency
1. If you use no-default-features: add the std feature
Resolve compiler errors
Resolve behavior changes
1. Refactor your App creation to a function and add a test similar to the one below, resolving any of its assertions
2. Look over the “subtle changes” under BREAKING CHANGES
3. If using builder: test your application under various circumstances to see if ArgMatches asserts regarding AllowInvalidUtf8.
At your leisure: resolve deprecation notices

Example test:

fn app() -> clap::App<'static> {
    ...
}

#[test]
fn verify_app() {
    app().debug_assert();
}

From structopt 0.3.25

Add CLI tests, -h and --help output at a minimum (recommendation: trycmd for snapshot testing)
Replace your dependency from structopt = "..." to clap = { version = "3.0", features = ["derive"] }
1. If you use no-default-features: add the std feature
Resolve compiler errors, including
1. Update your use statements from structopt and structopt::clap to clap
Resolve behavior changes
1. Add a test similar to the one below, resolving any of its assertions
2. Look over the “subtle changes” under BREAKING CHANGES
At your leisure: resolve deprecation notices

Example test:

#[derive(clap::StructOpt)]
struct Args {
    ...
}

#[test]
fn verify_app() {
    use clap::IntoApp;
    Args::into_app().debug_assert()
}

From clap v3.0.0-beta.5

Add CLI tests, -h and --help output at a minimum (recommendation: trycmd for snapshot testing)
Update your dependency
1. Add in derive, env, cargo, or unicode feature flags as needed
Resolve compiler errors
1. If you use yaml, clap_app!, or usage parser: revert any changes you made for clap3
2. Change Arg::about Arg::long_about back to help and long_help and change PossibleValue::about to help (clap-rs/clap#3075)
3. Change AppSettings::HelpRequired to AppSettings::HelpExpected
4. Change PossibleValue::hidden to PossibleValue::hide
5. Change App::subcommand_placeholder to App::subcommand_value_name / App::subcommand_help_heading
Resolve behavior changes
1. Add the above listed test appropriate for your application and resolve any problems it reports
2. If using derive: see the structopt breaking changes section for Vec changes
3. If using builder: test your application under various circumstances to see if ArgMatches asserts regarding AllowInvalidUtf8.
At your leisure: resolve deprecation notices

BREAKING CHANGES

From clap 2

Subtle changes (i.e. compiler won't catch):

AppSettings::UnifiedHelpMessage is now default behaviour
- {flags} and {unified} will assert if present in App::help_template
- See clap-rs/clap#2807
AppSettings::EnableColoredHelp is now the default behavior but can be opted-out with AppSettings::DisableColoredHelp (clap-rs/clap#2806)
App::override_usage no longer implies a leading \t, allowing multi lined usages
Arg::require_equals no longer implies ArgSettings::ForbidEmptyValues (#2233)
Arg::require_delimiter no longer implies ArgSettings::TakesValue and ArgSettings::UseValueDelimiter (#2233)
Arg::env, Arg::env_os, Arg::last, Arg::require_equals, Arg::allow_hyphen_values, Arg::hide_possible_values, Arg::hide_default_value, Arg::hide_env_values, Arg::case_insensitive and Arg::multiple_values no longer imply ArgSettings::TakesValue (#2233)
ArgMatches::is_present no longer checks subcommand names
Some env variable values are now considered false for flags, not just “not-present” (clap-rs/clap#2539)
Changed ...s meaning in usage parser. Before, it always meant multiple which is still true for --option [val].... Now [name]... --option [val] results in ArgSettings::MultipleOccurrences.
Usage exit code changed from 1 to 2 (clap-rs/clap#1327)
Reject --foo=bar when takes_value(false) (clap-rs/clap#1543)
No longer accept an arbitrary number of - for long arguments (-----long)

Easier to catch changes:

When using no-default-features, you now have to specify the std feature (reserved for future work)
Gated env support behind env feature flag
- Impacts Arg::env, Arg::env_os, Arg::hide_env_values, ArgSettings::HideEnvValues
- See clap-rs/clap#2694
Gated crate information behind cargo feature flag
- Impacts crate_name!, crate_version!, crate_authors!, crate_description!, app_from_crate!
AppSettings::StrictUtf8 is now default behaviour and asserts if AppSettings::AllowInvalidUtf8ForExternalSubcommands and ArgSettings::AllowInvalidUtf8 and ArgMatches::value_of_os aren't used together
- AppSettings::AllowInvalidUtf8 has been removed
- clap-rs/clap#751
Arg::short and Arg::value_delimiter now take a char instead of a &str
ArgMatches panics on unknown arguments
Removed VersionlessSubcommands, making it the default (see clap-rs/clap#2812)
Completion generation has been split out into clap_complete.
Removed ArgSettings::EmptyValues in favor of ArgSettings::ForbidEmptyValues
Validator signatures have been loosed:
- Arg::validator now takes first argument as Fn(&str) -> Result<O, E: ToString> instead of Fn(String) -> Result<(), String>
- Arg::validator_os now takes first argument as Fn(&OsStr) -> Result<O, OsString> instead of Fn(&OsStr) -> Result<(), OsString>
Arg::value_name now sets, rather than appends (see clap-rs/clap#2634)
Upgrade yaml-rust from 0.3 to 0.4
Replaced ArgGroup::from(BTreeMap) to ArgGroup::from(yaml)
Replaced ArgMatches::usage with App::generate_usage
Replaced Arg::settings with Arg::setting(Setting1 | Setting2)
App and Arg now need only one lifetime
Removed deprecated App::with_defaults, replaced with app_from_crate
Removed deprecated AppSettings::PropagateGlobalValuesDown (now the default)
Some App functions, like App::write_help now take &mut self instead of &self
Error::message is now private, use Error::to_string
Arg::default_value_if, Arg::default_value_if_os, Arg::default_value_ifs, Arg::default_value_ifs_os now takes the default value parameter as an option (clap-rs/clap#1406)
Changed App::print_help & App::print_long_help to now return std::io::Result
Changed App::write_help & App::write_long_help to now return std::io::Result
Changed Arg::index, Arg::number_of_values, Arg::min_values, Arg::max_values to taking usize instead of u64
Changed Error::info to type Vec<String> instead of Option<Vec<String>>
Changed ArgMatches::subcommand to now return Option<(&str, &ArgMatches)>
Renamed ErrorKind::MissingArgumentOrSubcommand to ErrorKind::DisplayHelpOnMissingArgumentOrSubcommand
Renamed ErrorKind::HelpDisplayed to ErrorKind::DisplayHelp
Renamed ErrorKind::VersionDisplayed to ErrorKind::DisplayVersion
Added #[non_exhaustive] to clap::{ValueHint, ErrorKind, AppSettings, ArgSettings} (clap-rs/clap#3167)

From structopt 0.3.25

By default, the App isn't initialized with crate information anymore. Now opt-in via #[clap(author)], #[clap(about)], #[clap(version)] (clap-rs/clap#3034)
#[clap(default_value)] is replaced with #[clap(default_value_t)] (clap-rs/clap#1694)
Subcommands nested under subcommands now needs a #[clap(subcommand)] attribute (clap-rs/clap#2587)
Vec<_> and Option<Vec<_>> have changed from multiple to multiple_occurrences

On top of the clap 2 changes

Performance

From clap 2

Split out non-default unicode feature flag for faster builds and smaller binaries for ASCII-only CLIs.
Split out non-default env feature flag for faster builds and smaller binaries.

Features

From clap 2

Integration of structopt::StructOpt via clap::Parser (requires derive feature flag)
Custom help headings
- App::help_heading (apply to all future args)
- Arg::help_heading (apply to current arg)
- App::subcommand_help_heading along with App::subcommand_value_name (apply to subcommands)
- See clap-rs/clap#805
- AppSettings::UnifiedHelpMessage is now default behaviour (clap-rs/clap#2807)
Deriving of ArgEnum for generating Arg::possible_values (requires derive feature flag)
Disable built-in help/version behavior with AppSettings::NoAutoHelp and AppSettings::NoAutoVersion
Change an existing arg with new builder method mut_arg (particularly helpful for --help and --version)
Provide extra context in long help messages (--help) with before_long_help and after_long_help (clap-rs/clap#1903)
Detect missing help descriptions via debug asserts by enabling AppSettings::HelpExpected
Aliases for short flags (clap-rs/clap#1896)
Validate UTF-8 values, rather than panicing during ArgMatches::value_of thanks to AppSettings::AllowInvalidUtf8ForExternalSubcommands and ArgSettings::AllowInvalidUtf8
- Debug builds will assert when the ArgMatches calls do not match the UTF-8 setting.
- See clap-rs/clap#751
clap::PossibleValue to allow
- Hiding (clap-rs/clap#2756)
- Completion help for possible values for args (clap-rs/clap#2731)
Allow arguments to conflict with all others via Arg::exclusive (clap-rs/clap#1583)
Validate arguments with a regex (required regex feature flag)
- See clap-rs/clap
Arg::default_missing_value for cases like --color[=<WHEN>] (clap-rs/clap#1587)
clap::App::color / clap::ColorChoice to specify color setting for the app
Custom error reporting with App::error
App::debug_assert test helper
Replace Arg::multiple(bool) with Arg::multiple_values / Arg::multiple_occurrences
- Positionals can be either
Added support for flag subcommands like pacman (clap-rs/clap#1361)
Partial parsing via AppSettings::IgnoreErrors (clap-rs/clap#1880)
Enable cmd help to print long help (--help instead of -h) with AppSettings::UseLongFormatForHelpSubcommand (clap-rs/clap#2435)
Allow long arg abbreviations like we do with subcommands via AppSettings::InferLongArgs (clap-rs/clap#2435)
Detect subcommands among positional arguments with AppSettings::SubcommandPrecedenceOverArg
Give completion scripts hints with Arg::value_hint (clap-rs/clap#1793)
Allow unsetting defaults with
Arg::default_value_if, Arg::default_value_if_os, Arg::default_value_ifs, Arg::default_value_ifs_os (clap-rs/clap#1406)
Interpret some env variable values as false for flags, in addition to “not-present” (clap-rs/clap#2539)
- n, no, f, false, off, 0
Added arg! macro for creating an Arg from a compile-time usage parser
(Experimental) Busybox-like multi-call support
- See AppSettings::Multicall behind unstable-multicall feature flag
- See clap-rs/clap#1120
(Experimental) Alias an argument to anything group of arguments
- See App::replace behind unstable-replace feature flag
- See clap-rs#1603
(Experimental) Grouping of multiple values within multiple occurrences
- See ArgMatches::grouped_values_of behind unstable-grouped feature flag
- See clap-rs/clap#1026

From structopt 0.3.25

Allow defaulting with native types via new default_value_t [= <expr>] attribute (clap-rs/clap#1694)
New update API
New arg_enum attribute for integrating with ArgEnum trait

On top of the clap 2 changes

Fixes

From clap 2

Correctly handle colored output on Windows
Only generate version flags when App::version, App::long_version are set (see clap-rs/clap#2812)
General completion script improvements
Limited default help text wrapping to 100 when wrap_help feature is not enabled
Be more specific than Arg::multiple with Arg::multiple_values and Arg::multiple_occurrences
app_from_crate! defaults to separating multiple authors with ", "
Ensure all examples work
IgnoreCase is now unicode aware (requires unicode feature flag)
Always respect ColorChoice::Never, even if that means we skip colors in some cases
ArgMatches panics on unknown arguments
Gracefully handle empty authors field in Cargo.toml with app_from_crate
Do not show --help in cmd help with DisableHelpFlag (clap-rs/clap#3169)
Do not show --help in cmd help help that doesn't work (clap-rs/clap#3169)

From structopt 0.3.25

Support SubcommandsNegateReqs by allowing required Option<_>s (clap-rs/clap#2255)
Infer AllowInvalidUtf8 based on parser (clap-rs/clap#751)
Gracefully handle empty authors field in Cargo.toml
Don't panic with default_value_os but treat it like default_value (clap-rs/clap#3031)
When using flatten and subcommand, ensure our doc comment always overrides the nested container's doc comment, whether it has only about or about and long_about (clap-rs/clap#3175)

On top of the clap 2 changes

Minimum Required Rust

As of this release, clap requires rustc 1.54.0 or greater.

2.34.0 - 2021-11-30

Updates to Rust 2018 edition and bumps the MSRV to Rust 1.46

2.33.4 - 2021-11-29

Bug Fixes

prevents panic: swallows broken pipe errors on error output (7a729bc4)

2.33.3 - 2020-08-13

Improvements

Suppress deprecation warnings when using crate_* macros.

2.33.2 - 2020-08-5

Documentation

Fixed links to 2.x examples. Now they point to the right place.

2.33.1 - 2020-05-11

Bug Fixes

Windows: Prevent some panics when parsing invalid Unicode on Windows (922c645, closes #1905)

Documentation

fixes versions referenced in the README (d307466a)
README.md:
- cuts down the number of examples to reduce confusion (6e508ee0)

Improvements

Deps: doesnt compile ansi_term on Windows since its not used (b57ee946, closes #1155)

Minimum Required Rust

As of this release, clap requires rustc 1.36.0 or greater.

2.33.0 - 2019-04-06

New Sponsor

Stephen Oats is now a sponsor \o/ (823457c0)
SPONSORS.md: fixes Josh Triplett's info in the sponsor document (24cb5740)

Features

Completions: adds completion support for Elvish. (e9d0562a)
There is a new setting to disable automatic building of --help and -h flags (AppSettings::DisableAutoHelp)

Improvements

arg_matches.rs: add Debug implementations (47192b7a)
macros: Support shorthand syntax for ArgGroups (df9095e7)

Documentation

Refer to macOS rather than OSX. (ab0d767f)
README.md: use https for all links (96a7639a)

Bug Fixes

add debug assertion for missing args in subcommand ArgGroup (2699d9e5)
Restore compat with Rust 1.21 (6b263de1)
Don't mention unused subcommands (ef92e2b6)
OsValues: Add ExactSizeIterator implementation (356c69e5)
arg_enum!:
- Fix comma position for valid values. (1f1f9ff3)
- Invalid expansions of some trailing-comma patterns (7023184f)
completions: improve correctness of completions when whitespace is involved (5a08ff29)
help message: Unconditionally uses long description for subcommands (6acc8b6a, closes #897)
macros: fixes broken pattern which prevented calling multi-argument Arg methods (9e7a352e)
parser: Better interaction between AllowExternalSubcommands and SubcommandRequired (9601c95a)

Minimum Required Rust

As of this release, clap requires rustc 1.31.0 or greater.

v2.32.0 (2018-06-26)

Minimum Required Rust

As of this release, clap requires rustc 1.21.0 or greater.

Features

Completions: adds completion support for Elvish. (e9d0562a)

Improvements

macros: Support shorthand syntax for ArgGroups (df9095e7)

Bug Fixes

OsValues: Add ExactSizeIterator implementation (356c69e5)
arg_enum!: Invalid expansions of some trailing-comma patterns (7023184f)
help message: Unconditionally uses long description for subcommands (6acc8b6a, closes #897)

Documentation

Refer to macOS rather than OSX. (ab0d767f)

v2.31.2 (2018-03-19)

Bug Fixes

Fish Completions: fixes a bug that only allowed a single completion in in Fish Shell (e8774a8, closes #1212)
AllowExternalSubcommands: fixes a bug where external subcommands would be blocked by a similarly named subcommand (suggestions were getting in the way). (a410e85)

Documentation

Fixes some typos in the README.md (c8e685d7)

v2.31.1 (2018-03-06)

Improvements

AllowMissingPositional: improves the ability of AllowMissingPositional to allow ‘skipping’ to the last positional arg with ‘--’ (df20e6e2)

v2.31.0 (2018-03-04)

Features

Arg Indices: adds the ability to query argument value indices (f58d0576)
Indices: implements an Indices<Item=&usize> iterator (1e67be44)
Raw Args adds a convenience function to Arg that allows implying all of Arg::last Arg::allow_hyphen_values and Arg::multiple(true) (66a78f29)

Documentation

Fix some typos and markdown issues. (935ba0dd)
Arg Indices: adds the documentation for the arg index querying methods (50bc0047)
CONTRIBUTING.md: fix url to clippy upstream repo to point to https://github.com/rust-lang-nursery/rust-clippy instead of https://github.com/Manishearth/rust-clippy (42407d7f)
Values: improves the docs example of the Values iterator (74075d65)
Updates readme to hint that the wrap_help feature is a thing (fc7ab227)

Improvements

Cargo.toml: use codegen-units = 1 in release and bench profiles (19f425ea)
Adds WASM support (clap now compiles on WASM!) (689949e5)
Uses the short help tool-tip for PowerShell completion scripts (ecda22ce)

v2.30.0 (2018-02-13)

Bug Fixes

YAML: Adds a missing conversion from Arg::last when instantiating from a YAML file (aab77c81a5, closes #1160)

Improvements

Bash Completions: instead of completing a generic option name, all bash completions fall back to file completions UNLESS Arg::possible_values was used (872f02ae)
Deps: No longer needlessly compiles ansi_term on Windows since its not used (b57ee946, closes #1155)
Help Message: changes the [values: foo bar baz] array to [possible values: foo bar baz] for consistency with the API (414707e4e97, closes #1160)

v2.29.4 (2018-02-06)

Bug Fixes

Overrides Self: fixes a bug where options with multiple values couldn't ever have multiple values (d95907cf)

v2.29.3 (2018-02-05)

Improvements

Overrides: clap now supports arguments which override with themselves (6c7a0010, closes #976)

Bug Fixes

Requirements: fixes an issue where conflicting args would still show up as required (e06cefac, closes #1158)
Fixes a bug which disallows proper nesting of -- (73993fe, closes #1161)

New Settings

AllArgsOverrideSelf: adds a new convenience setting to allow all args to override themselves (4670325d)

v2.29.2 (2018-01-16)

Features

completions/zsh.rs:
- Escape possible values for options (25561dec)
- Implement positional argument possible values completion (f3b0afd2)
- Complete positional arguments properly (e39aeab8)

Bug Fixes

completions/zsh.rs:
- Add missing autoload for is-at-least (a6522607)
- Don't pass -S to _arguments if Zsh is too old (16b4f143)
- Maybe fix completions with mixed positionals and subcommands (1146f0da)
completions/zsh.zsh: Remove redundant code from output (0e185b92, closes #1142)

2.29.1 (2018-01-09)

Documentation

fixes broken links. (56e734b8)
updates contributors list (e1313a5a)

Performance

further debloating by removing generics from error cases (eb8d919e)
debloats clap by deduplicating logic and refactors (03e413d7)

Bug Fixes

fixes the ripgrep benchmark by adding a value to a flag that expects it (d26ab2b9)
bash completion: Change the bash completion script code generation to support hyphens. (ba7f1d18)
completions/zsh.rs: Fix completion of long option values (46365cf8)

2.29.0 (2017-12-02)

API Additions

Arg: adds Arg::hide_env_values(bool) which allows one to hide any current env values and display only the key in help messages (fb41d062)

2.28.0 (2017-11-28)

The minimum required Rust is now 1.20. This was done to start using bitflags 1.0 and having >1.0 deps is a very good thing!

Documentation

changes the demo version to 2.28 to stay in sync (ce6ca492)
Fix URL path to github hosted files (ce72aada, closes #1106)
fix typo (002b07fc)
README.md: updates the readme and pulls out some redundant sections (db6caf86)

Improvements

adds ‘[SUBCOMMAND]’ to usage strings with only AppSettings::AllowExternalSubcommands is used with no other subcommands (e78bb757, closes #1093)

API Additions

Adds Arg::case_insensitive(bool) which allows matching Arg::possible_values without worrying about ASCII case (1fec268e, closes #1118)
Adds the traits to be used with the clap-derive crate to be able to use Custom Derive (6f4c3412)

Bug Fixes

Fixes a regression where --help couldn't be overridden (a283d69f, closes #1112)
fixes a bug that allowed options to pass parsing when no value was provided (2fb75821, closes #1105)
ignore PropagateGlobalValuesDown deprecation warning (f61ce3f5, closes #1086)

Deps

Updates bitflags to 1.0

v2.27.1 (2017-10-24)

Bug Fixes

Adds term_size as an optional dependency (with feature wrap_help) to fix compile bug

v2.27.0 (2017-10-24)

** This release raises the minimum required version of Rust to 1.18 **

** This release also contains a very minor breaking change to fix a bug **

The only CLIs affected will be those using unrestrained multiple values and subcommands where the subcommand name can coincide with one of the multiple values.

See the commit 0c223f54 for full details.

Bug Fixes

Values from global args are now propagated UP and DOWN!
fixes a bug where using AppSettings::AllowHyphenValues would allow invalid arguments even when there is no way for them to be valid (77ed4684, closes #1066)
when an argument requires a value and that value happens to match a subcommand name, its parsed as a value (0c223f54, closes #1031, breaks #, #)
fixes a bug that prevented number_of_values and default_values to be used together (5eb342a9, closes #1050, #1056)
fixes a bug that didn't allow args with default values to have conflicts (58b5b4be, closes #1071)
fixes a panic when using global args and calling App::get_matches_from_safe_borrow multiple times (d86ec797, closes #1076)
fixes issues and potential regressions with global args values not being propagated properly or at all (a43f9dd4, closes #1010, #1061, #978)
fixes a bug where default values are not applied if the option supports zero values (9c248cbf, closes #1047)

Documentation

adds additional blurbs about using multiples with subcommands (03455b77)
updates the docs to reflect changes to global args and that global args values can now be propagated back up the stack (ead076f0)
add html_root_url attribute (e67a061b)
sync README version numbers with crate version (5536361b)

Improvements

args that have require_delimiter(true) is now reflected in help and usage strings (dce61699, closes #1052)
if all subcommands are hidden, the subcommands section of the help message is no longer displayed (4ae7b046, closes #1046)

Breaking Changes

when an argument requires a value and that value happens to match a subcommand name, its parsed as a value (0c223f54, closes #1031, breaks #, #)

Deprecations

AppSettings::PropagateGlobalValuesDown: this setting is no longer required to propagate values down or up (2bb5ddce)

v2.26.2 (2017-09-14)

Improvements

if all subcommands are hidden, the subcommands section of the help message is no longer displayed (4ae7b046, closes #1046)

Bug Fixes

fixes a bug where default values are not applied if the option supports zero values (9c248cbf, closes #1047)

v2.26.1 (2017-09-14)

Bug Fixes

fixes using require_equals(true) and min_values(0) together (10ae208f, closes #1044)
escape special characters in zsh and fish completions (87e019fc)
avoid panic generating default help msg if term width set to 0 due to bug in textwrap 0.7.0 (b3eadb0d)
Change who's -> whose (53c1ffe8)
adds a debug assertion to ensure all args added to groups actually exist (7ad123e2, closes #917)
fixes a bug where args that allow values to start with a hyphen couldn't contain a double hyphen -- as a value (ab2f4c9e, closes #960)
fixes a bug where positional argument help text is misaligned (54c16836)
Help Message: fixes long_about not being usable (a8257ea0, closes #1043)
Suggestions: output for flag after subcommand (434ea5ba)

v2.26.0 (2017-07-29)

Minimum version of Rust is now v1.13.0 (Stable)

Improvements

bumps unicode-segmentation to v1.2 (cd7b40a2)

Performance

update textwrap to version 0.7.0 (c2d4e637)

v2.25.1 (2017-07-21)

Improvements

impl Default for Values + OsValues for any lifetime. (fb7d6231f1)

Documentation

Various documentation typos and grammar fixes

v2.25.0 (2017-06-20)

Features

use textwrap crate for wrapping help texts (b93870c1)

Improvements

Suggestions: suggests to use flag after subcommand when applicable (2671ca72)
Bumps bitflags crate to v0.9

Documentation

Change who's -> whose (53c1ffe8)

Documentation

App::template: adds details about the necessity to use AppSettings::UnifiedHelpMessage when using {unified} tags in the help template (cbea3d5a, closes #949)
Arg::allow_hyphen_values: updates the docs to include warnings for allow_hyphen_values and multiple(true) used together (f9b0d657)
README.md:
- added a warning about using ~ deps (821929b5, closes #964)
clap_app!: adds using the @group specifier to the macro docs (826048cb, closes #932)

v2.24.2 (2017-05-15)

Bug Fixes

adds a debug assertion to ensure all args added to groups actually exist (14f6b8f3, closes #917)
fixes a bug where args that allow values to start with a hyphen couldn't contain a double hyphen -- as a value (ebf73a09, closes #960)
fixes a bug where positional argument help text is misaligned (54c16836)

Documentation

App::template: adds details about the necessity to use AppSettings::UnifiedHelpMessage when using {unified} tags in the help template (cf569438, closes #949)
Arg::allow_hyphen_values: updates the docs to include warnings for allow_hyphen_values and multiple(true) used together (ded5a2f1)
clap_app!: adds using the @group specifier to the macro docs (fe85fcb1, closes #932)

v2.24.0 (2017-05-07)

Bug Fixes

fixes a bug where args with last(true) and required(true) set were not being printed in the usage string (3ac533fe, closes #944)
fixes a bug that was printing the arg name, instead of value name when Arg::last(true) was used (e1fe8ac3, closes #940)
fixes a bug where flags were parsed as flags AND positional values when specific combinations of settings were used (20f83292, closes #946)

v2.24.0 (2017-05-05)

Documentation

README.md: fix some typos (fa34deac)

API Additions

Arg: add default_value_os (d5ef8955)
arg_matches.rs: Added a Default implementation for Values and OsValues iterators. (0a4384e3)

v2.23.2 (2017-04-19)

Bug Fixes

PowerShell Completions: fixes a bug where powershells completions cant be used if no subcommands are defined (a8bce558, closes #931)

Improvements

bumps term_size to take advantage of better terminal dimension handling (e05100b7)
PowerShell Completions: massively dedups subcommand names in the generate script to make smaller scripts that are still functionally equiv (85b0e1cc)

Documentation

Fix a typo the minimum rust version required (71dabba3)

v2.23.1 (2017-04-05)

Bug Fixes

fixes a missing newline character in the autogenerated help and version messages in some instances (5ae9007d)

v2.23.0 (2017-04-05)

API Additions

App::long_about
App::long_version
App::print_long_help
App::write_long_help
App::print_long_version
App::write_long_version
Arg::long_help

Features

allows distinguishing between short and long version messages (-V/short or --version/long) (59272b06)
allows distinguishing between short and long help with subcommands in the same manner as args (6b371891)
allows specifying a short help vs a long help (i.e. varying levels of detail depending on if -h or --help was used) (ef1b24c3)
clap_app!: adds support for arg names with hyphens similar to longs with hyphens (f7a88779, closes #869)

Bug Fixes

fixes a bug that wasn't allowing help and version to be properly overridden (8b2ceb83, closes #922)

Documentation

clap_app!: documents the --("some-arg") method for using args with hyphens inside them (bc08ef3e, closes #919)

v2.22.2 (2017-03-30)

Bug Fixes

Custom Usage Strings: fixes the usage string regression when using help templates (0e4fd96d)

v2.22.1 (2017-03-24)

Bug Fixes

usage: fixes a big regression with custom usage strings (2c41caba)

v2.22.0 (2017-03-23)

API Additions

App::name: adds the ability to change the name of the App instance after creation (d49e8292, closes #908)
Arg::hide_default_value: adds ability to hide the default value of an argument from the help string (89e6ea86, closes #902)

v2.21.3 (2017-03-23)

Bug Fixes

yaml: adds support for loading author info from yaml (e04c390c)

v2.21.2 (2017-03-17)

Improvements

add fish subcommand help support (f8f68cf8)
options that use require_equals(true) now display the equals sign in help messages, usage strings, and errors" (c8eb0384, closes #903)

Bug Fixes

setting the max term width now correctly propagates down through child subcommands

v2.21.1 (2017-03-12)

Bug Fixes

ArgRequiredElseHelp: fixes the precedence of this error to prioritize over other error messages (74b751ff, closes #895)
Positionals: fixes some regression bugs resulting from old asserts in debug mode. (9a3bc98e, closes #896)

v2.21.0 (2017-03-09)

Performance

doesn't run arg_post_processing on multiple values anymore (ec516182)
changes internal use of VecMap to Vec for matched values of Args (22bf137a)
vastly reduces the amount of cloning when adding non-global args minus when they're added from App::args which is forced to clone (8da0303b)
refactor to remove unneeded vectors and allocations and checks for significant performance increases (0efa4119)

Documentation

Fix examples link in CONTRIBUTING.md (60cf875d)

Improvements

when AppSettings::SubcommandsNegateReqs and ArgsNegateSubcommands are used, a new more accurate double line usage string is shown (50f02300, closes #871)

API Additions

Arg::last: adds the ability to mark a positional argument as ‘last’ which means it should be used with -- syntax and can be accessed early (6a7aea90, closes #888)
provides default_value_os and default_value_if[s]_os (0f2a3782, closes #849)
provides App::help_message and App::version_message which allows one to override the auto-generated help/version flag associated help (389c413, closes #889)

New Settings

InferSubcommands: adds a setting to allow one to infer shortened subcommands or aliases (i.e. for subcommmand “test”, “t”, “te”, or “tes” would be allowed assuming no other ambiguities) (11602032, closes #863)

Bug Fixes

doesn't print the argument sections in the help message if all args in that section are hidden (ce5ee5f5)
doesn't include the various [ARGS] [FLAGS] or [OPTIONS] if the only ones available are hidden (7b4000af, closes #882)
now correctly shows subcommand as required in the usage string when AppSettings::SubcommandRequiredElseHelp is used (8f0884c1)
fixes some memory leaks when an error is detected and clap exits (8c2dd287)
fixes a trait that's marked private accidentally, but should be crate internal public (1ae21108)
Completions: fixes a bug that tried to propagate global args multiple times when generating multiple completion scripts (5e9b9cf4, closes #846)

Features

Options: adds the ability to require the equals syntax with options --opt=val (f002693d, closes #833)

v2.20.5 (2017-02-18)

Bug Fixes

clap_app!: fixes a critical bug of a missing fragment specifier when using !property style tags. (5635c1f94)

v2.20.4 (2017-02-15)

Bug Fixes

Completions: fixes a bug that tried to propagate global args multiple times when generating multiple completion scripts (5e9b9cf4, closes #846)

Documentation

Fix examples link in CONTRIBUTING.md (60cf875d)

v2.20.3 (2017-02-03)

Documentation

Macros: adds a warning about changing values in Cargo.toml not triggering a rebuild automatically (112aea3e, closes #838)

Bug Fixes

fixes a println->debugln typo (279aa62e)
fixes bash completions for commands that have an underscore in the name (7f5cfa72, closes #581)
fixes a bug where ZSH completions would panic if the binary name had an underscore in it (891a2a00, closes #581)
allow final word to be wrapped in wrap_help (564c5f0f, closes #828)
fixes a bug where global args weren't included in the generated completion scripts (9a1e006e, closes #841)

v2.20.2 (2017-02-03)

Bug Fixes

fixes a critical bug where subcommand settings were being propagated too far (74648c94, closes #832)

Improvements

adds ArgGroup::multiple to the supported YAML fields for building ArgGroups from YAML (d8590037, closes #840)

v2.20.1 (2017-01-31)

Bug Fixes

allow final word to be wrapped in wrap_help (564c5f0f, closes #828)
actually show character in debug output (84d8c547)
include final character in line length (aff4ba18)

Improvements

updates libc and term_size deps for the libc version conflict (6802ac4a)

Documentation

fix link from app_from_crate! to crate_authors! (#822) (5b29be9b)
fix spelling of “guaranteed” (4f30a65b)

New Settings

ArgsNegateSubcommands: disables args being allowed between subcommands (5e2af8c9, closes #793)
DontCollapseArgsInUsage: disables the collapsing of positional args into [ARGS] in the usage string (c2978afc, closes #769)
DisableHelpSubcommand: disables building the help subcommand (a10fc859)
AllowMissingPositional: allows one to implement $ prog [optional] <required> style CLIs where the second positional argument is required, but the first is optional (1110fdc7, closes #636)
PropagateGlobalValuesDown: automatically propagats global arg's values down through used subcommands (985536c8, closes #694)

API Additions

Arg

Arg::value_terminator: adds the ability to terminate multiple values with a given string or char (be64ce0c, closes #782)
Arg::default_value_if[s]: adds new methods for conditional default values (such as a particular value from another argument was used) (eb4010e7)
Arg::requires_if[s]: adds the ability to conditionally require additional args (such as if a particular value was used) (198449d6)
Arg::required_if[s]: adds the ability for an arg to be conditionally required (i.e. “arg X is only required if arg Y was used with value Z”) (ee9cfddf)
Arg::validator_os: adds ability to validate values which may contain invalid UTF-8 (47232498)

Macros

crate_description!: Uses the Cargo.toml description field to fill in the App::about method at compile time (4d9a82db, closes #778)
crate_name!: Uses the Cargo.toml name field to fill in the App::new method at compile time (4d9a82db, closes #778)
app_from_crate!: Combines crate_version!, crate_name!, crate_description!, and crate_authors! into a single macro call to build a default App instance from the Cargo.toml fields (4d9a82db, closes #778)

Features

no_cargo: adds a no_cargo feature to disable Cargo-env-var-dependent macros for those not using cargo to build their crates (#786) (6fdd2f9d)

Bug Fixes

Options: fixes a critical bug where options weren't forced to have a value (5a5f2b1e, closes #665)
fixes a bug where calling the help of a subcommand wasn't ignoring required args of parent commands (d3d34a2b, closes #789)
Help Subcommand: fixes a bug where the help subcommand couldn't be overridden (d34ec3e0, closes #787)
Low Index Multiples: fixes a bug which caused combinations of LowIndexMultiples and Arg::allow_hyphen_values to fail parsing (26c670ca)

Improvements

Default Values: improves the error message when default values are involved (1f33de54, closes #774)
YAML: adds conditional requirements and conditional default values to YAML (9a4df327, closes #764)
Support --("some-arg-name") syntax for defining long arg names when using clap_app! macro (f41ec962)
Support ("some app name") syntax for defining app names when using clap_app! macro (9895b671, closes #759)
Help Wrapping: long app names (with spaces), authors, and descriptions are now wrapped appropriately (ad4691b7, closes #777)

Documentation

Conditional Default Values: fixes the failing doc tests of Arg::default_value_ifs (4ef09101)
Conditional Requirements: adds docs for Arg::requires_ifs (7f296e29)
README.md: fix some typos (f22c21b4)
src/app/mod.rs: fix some typos (5c9b0d47)

v2.19.3 (2016-12-28)

Bug Fixes

fixes a bug where calling the help of a subcommand wasn't ignoring required args of parent commands (a0ee4993, closes #789)

v2.19.2 (2016-12-08)

Bug Fixes

ZSH Completions: escapes square brackets in ZSH completions (7e17d5a3, closes #771)

Documentation

Examples: adds subcommand examples (0e0f3354, closes #766)
README.md: adds guidance on when to use ~ in version pinning, and clarifies breaking change policy (591eaefc, closes #765)

v2.19.1 (2016-12-01)

Bug Fixes

Help Messages: fixes help message alignment when specific settings are used on options (cd94b318, closes #760)

Improvements

Bash Completion: allows bash completion to fall back to traditional bash completion upon no matching completing function (b1b16d56))

v2.19.0 (2016-11-21)

Features

allows specifying AllowLeadingHyphen style values, but only for specific args vice command wide (c0d70feb, closes #742)

Bug Fixes

Required Unless: fixes a bug where having required_unless set doesn't work when conflicts are also set (d20331b6, closes #753)
ZSH Completions: fixes an issue where zsh completions caused panics if there were no subcommands (49e7cdab, closes #754)

Improvements

Validators: improves the error messages for validators (65eb3385, closes #744)

Documentation

updates the docs landing page (01e1e33f)
adds the macro version back to the readme (45eb9bf1)
fix broken docs links (808e7cee)
Compatibility Policy: adds an official compatibility policy to (760d66dc, closes #740)
Contributing: updates the readme to improve the readability and contributing sections (eb51316c)

v2.18.0 (2016-11-05)

Features

Completions: adds completion support for PowerShell. (cff82c88, closes #729)

v2.17.1 (2016-11-02)

Bug Fixes

Low Index Multiples: fixes a bug where using low index multiples was propagated to subcommands (33924e88, closes #725)

v2.17.0 (2016-11-01)

Features

Positional Args: allows specifying the second to last positional argument as multiple(true) (1ced2a74, closes #725)

v2.16.4 (2016-10-31)

Improvements

Error Output: conflicting errors are now symmetrical, meaning more consistent and less confusing (3d37001d, closes #718)

Documentation

Fix typo in example 13a_enum_values_automatic (c22fbc07)
README.md: fixes failing yaml example (#715) (21fba9e6)

Bug Fixes

ZSH Completions: fixes bug that caused panic on subcommands with aliases (5c70e1a0, closes #714)
debug: fixes the debug feature (#716) (6c11ccf4)

v2.16.3 (2016-10-28)

Bug Fixes

Derive display order after propagation (9cb6facf, closes #706)
yaml-example: inconsistent args (847f7199)

v2.16.2 (2016-10-25)

Bug Fixes

Fish Completions: fixes a bug where single quotes are not escaped (780b4a18, closes #704)

v2.16.1 (2016-10-24)

Bug Fixes

Help Message: fixes a regression bug where args with multiple(true) threw off alignment (ebddac79, closes #702)

v2.16.0 (2016-10-23)

Features

Completions: adds ZSH completion support (3e36b0ba, closes #699)

v2.15.0 (2016-10-21)

Features

AppSettings: adds new setting AppSettings::AllowNegativeNumbers (ab064546, closes #696)

Documentation

app/settings.rs: moves variants to roughly alphabetical order (9ed4d4d7)

v2.14.1 (2016-10-20)

Documentation

Improve documentation around features (4ee85b95)
reword docs for ErrorKind and app::Settings (3ccde7a4)
fix tests that fail when the “suggestions” feature is disabled (996fc381)
fix the OsString-using doc-tests (af9e1a39)
tag non-rust code blocks as such instead of ignoring them (0ba9f4b1)
ErrorKind: improve some errors about subcommands (9f6217a4)
yaml: make sure the doc-tests don't fail before “missing file” (8c0f5551)

Improvements

Stabilize clap_app! (cd516006)
with_defaults: Deprecate App::with_defaults() (26085409, closes #638)

Bug Fixes

fixes a bug that made determining when to auto-wrap long help messages inconsistent (468baadb, closes #688)
Completions: fish completions for nested subcommands (a61eaf8a)
features: Make lints not enable other nightly-requiring features (835f75e3)

v2.14.0 (2016-10-05)

Features

arg_aliases: Ability to alias arguments (33b5f6ef, closes #669)
flag_aliases: Ability to alias flags (40d6dac9)

Bug Fixes

UsageParser: Handle non-ascii names / options. (1d6a7c6e, closes #664)

Documentation

typo (bac417fa)

v2.13.0 (2016-09-18)

Documentation

updates README.md with new website information and updated video tutorials info (0c19c580)
updates the docs about removing implicit value_delimiter(true) (c81bc722)
Default Values: adds better examples on using default values (57a8d9ab, closes #418)

Bug Fixes

Value Delimiters: fixes the confusion around implicitly setting value delimiters. (default is now false) (09d4d0a9, closes #666)

v2.12.1 (2016-09-13)

Bug Fixes

Help Wrapping: fixes a regression-bug where the old {n} newline char stopped working (92ac353b, closes #661)

v2.12.0 (2016-09-13)

Features

Help: adds ability to hide the possible values on a per argument basis (9151ef73, closes #640)
help: allow for limiting detected terminal width (a43e28af, closes #653)

Documentation

Help Wrapping: removes the verbage about using '{n}' to insert newlines in help text (c5a2b352)
Value Delimiters: updates the docs for the Arg::multiple method WRT value delimiters and default settings (f9d17a06)
appsettings: Document AppSetting::DisableVersion (94501965, closes #589)

Bug Fixes

AllowLeadingHyphen: fixes a bug where valid args aren't recognized with this setting (a9699e4d, closes #588)

Improvements

Help Wrapping:
- clap now ignores hard newlines in help messages and properly re-aligns text, but still wraps if the term width is too small (c7678523, closes #617)
- makes some minor changes to when next line help is automatically used (01cae799)
Value Delimiters: changes the default value delimiter rules (f9e69254, closes #655)
YAML: supports setting Arg::require_delimiter from YAML (b9b55a39)

Performance

help: fix redundant contains() checks (a8afed74)

v2.11.3 (2016-09-07)

Documentation

Help Wrapping: removes the verbage about using '{n}' to insert newlines in help text (c5a2b352)

Improvements

Help Wrapping:
- clap now ignores hard newlines in help messages and properly re-aligns text, but still wraps if the term width is too small (c7678523, closes #617)
- makes some minor changes to when next line help is automatically used (01cae799)
YAML: supports setting Arg::require_delimiter from YAML (b9b55a39)

v2.11.2 (2016-09-06)

Improvements

Help Wrapping: makes some minor changes to when next line help is automatically used (5658b117)

v2.11.1 (2016-09-05)

Bug Fixes

Settings: fixes an issue where settings weren't propagated down through grandchild subcommands (b3efc107, closes #638)

Features

Errors: Errors with custom description (58512f2f)

Improvements

help: use term_size instead of home-grown solution (fc7327e9)

v2.11.0 (2016-08-28)

Bug Fixes

Groups: fixes some usage strings that contain both args in groups and ones that conflict with each other (3d782def, closes #616)

Documentation

moves docs to docs.rs (03209d5e, closes #634)

Improvements

Completions: uses standard conventions for bash completion files, namely ‘{bin}.bash-completion’ (27f5bbfb, closes #567)
Help: automatically moves help text to the next line and wraps when term width is determined to be too small, or help text is too long (150964c4, closes #597)
YAML Errors: vastly improves error messages when using YAML (f43b7c65, closes #574)

Features

adds App::with_defaults to automatically use crate_authors! and crate_version! macros (5520bb01, closes #600)

v2.10.4 (2016-08-25)

Bug Fixes

Help Wrapping: fixes a bug where help is wrapped incorrectly and causing a panic with some non-English characters (d0b442c7, closes #626)

v2.10.3 (2016-08-25)

Features

Help: adds new short hand way to use source formatting and ignore term width in help messages (7dfdaf20, closes #625)

Documentation

Term Width: adds details about set_term_width(0) (00b8205d)

Bug Fixes

Unicode: fixes two bugs where non-English characters were stripped or caused a panic with help wrapping (763a5c92, closes #626)

v2.10.2 (2016-08-22)

Bug Fixes

fixes a bug where the help is printed twice (a643fb28, closes #623)

v2.10.1 (2016-08-21)

Bug Fixes

Help Subcommand: fixes misleading usage string when using multi-level subcommmands (e203515e, closes #618)

Features

YAML: allows using lists or single values with arg declarations (9ade2cd4, closes #614, #613)

v2.10.0 (2016-07-29)

Features

Completions: one can generate a basic fish completions script at compile time (1979d2f2)

Bug Fixes

parser: preserve external subcommand name (875df243)

Breaking Changes

parser: preserve external subcommand name (875df243)

Documentation

YAML: fixes example 17's incorrect reference to arg_groups instead of groups (b6c99e13, closes #601)

2.9.3 (2016-07-24)

Bug Fixes

fixes bug where only first arg in list of required_unless_one is recognized (1fc3b55b, closes #575)
Settings: fixes typo subcommandsrequired->subcommandrequired (fc72cdf5, closes #593)

Features

Completions: adds the ability to generate completions to io::Write object (9f62cf73)
Settings: Add unset_setting and unset_settings fns to App (#598) (0ceba231, closes #590)

2.9.2 (2016-07-03)

Documentation

Completions: fixes the formatting of the Cargo.toml excerpt in the completions example (722f2607)

Bug Fixes

Completions: fixes bug where --help and --version short weren't added to the completion list (e9f2438e, closes #536)

2.9.1 (2016-07-02)

Improvements

Completions: allows multiple completions to be built by namespacing with bin name (57484b2d)

v2.9.0 (2016-07-01)

Documentation

Completions:
- fixes some errors in the completion docs (9b359bf0)
- adds documentation for completion scripts (c6c519e4)

Features

Completions:
- one can now generate a bash completions script at compile time! (e75b6c7b, closes #376)
- completions now include aliases to subcommands, including all subcommand options (0ab9f840, closes #556)
- completions now continue completing even after first completion (18fc2e5b)
- allows matching on possible values in options (89cc2026, closes #557)

Bug Fixes

AllowLeadingHyphen: fixes an issue where isn't ignored like it should be with this setting (96c24c9a, closes #558)

v2.8.0 (2016-06-30)

Features

Arg: adds new setting Arg::require_delimiter which requires val delimiter to parse multiple values (920b5595)

Bug Fixes

Declare term::Winsize as repr(C) (5d663d90)

Documentation

Arg: adds docs for (49af4e38)

v2.7.1 (2016-06-29)

Bug Fixes

Options:
- options with multiple values and using delimiters no longer parse additional values after a trailing space (cdc500bd)
- using options with multiple values and with an = no longer parse args after the trailing space as values (290f61d0)

v2.7.0 (2016-06-28)

Documentation

fix typos (43b3d40b)
ArgGroup: vastly improves ArgGroup docs by adding better examples (9e5f4f5d, closes #534)

Features

ArgGroup: one can now specify groups which require AT LEAST one of the args (33689acc, closes #533)

Bug Fixes

App: using App::print_help now prints the same as would have been printed by --help or the like (e84cc018, closes #536)
Help:
- prevents invoking help help and displaying incorrect help message (e3d2893f, closes #538)
- subcommand help messages requested via help now correctly match --help (08ad1cff, closes #539)

Improvements

ArgGroup: Add multiple ArgGroups per Arg (902e182f, closes #426)
Usage Strings: [FLAGS] and [ARGS] are no longer blindly added to usage strings (9b2e45b1, closes #537)
arg_enum!: allows using meta items like repr(C) with arg_enum!s (edf9b233, closes #543)

v2.6.0 (2016-06-14)

Improvements

removes extra newline from help output (86e61d19)
allows printing version to any io::Write object (921f5f79)
removes extra newline when printing version (7e2e2cbb)
Aliases: improves readability of asliases in help messages (ca511de7, closes #526, #529)
Usage Strings: improves the default usage string when only a single positional arg is present (ec86f2da, closes #518)

Features

Help: allows wrapping at specified term width (Even on Windows!) (1761dc0d, closes #451)
Settings:
- adds new setting to stop delimiting values with -- or TrailingVarArg (fc3e0f5a, closes #511)
- one can now set an AppSetting which is propagated down through child subcommands (e2341835, closes #519)
Subcommands: adds support for visible aliases (7b10e7f8, closes #522)

Bug Fixes

fixes bug where args are printed out of order with templates (05abb534)
fixes bug where one can't override version or help flags (90d7d6a2, closes #514)
fixes issue where before_help wasn't printed (b3faff60)
Help: App::before_help and App::after_help now correctly wrap (1f4da767, closes #516)
Settings: fixes bug where new color settings couldn't be converted from strs (706a7c11)
Subcommands: subcommands with aliases now display help of the aliased subcommand (5354d14b, closes #521)
Windows: fixes a failing windows build (01e7dfd6)
YAML: adds missing YAML methods for App and Arg (e468faf3, closes #528)

v2.5.2 (2016-05-31)

Improvements

removes extra newline from help output (86e61d19)
allows printing version to any io::Write object (921f5f79)
removes extra newline when printing version (7e2e2cbb)

Bug Fixes

fixes bug where args are printed out of order with templates (3935431d)
fixes bug where one can't override version or help flags (90d7d6a2, closes #514)
fixes issue where before_help wasn't printed (b3faff60)

Documentation

inter-links all types and pages (3312893d, closes #505)
makes all publicly available types viewable in docs (52ca6505)

v2.5.1 (2016-05-11)

Bug Fixes

Subcommand Aliases: fixes lifetime issue when setting multiple aliases at once (ac42f6cf0)

v2.5.0 (2016-05-10)

Improvements

SubCommand Aliases: adds feature to yaml configs too (69592195)

Features

SubCommands: adds support for subcommand aliases (66b4dea6, closes #469)

v2.4.3 (2016-05-10)

Bug Fixes

Usage Strings:
- now properly dedups args that are also in groups (3ca0947c, closes #498)
- removes duplicate groups from usage strings (f574fb8a)

Improvements

Groups: formats positional args in groups in a better way (fef11154)
Help:
- moves positionals to standard <> formatting (03dfe5ce)
- default help subcommand string has been shortened (5b7fe8e4, closes #494)

v2.4.3 (2016-05-10)

Ghost Release

v2.4.3 (2016-05-10)

Ghost Release

v2.4.0 (2016-05-02)

Features

Help: adds support for displaying info before help message (29fbfa3b)
Required: adds allowing args that are required unless certain args are present (af1f7916)

Documentation

hides formatting from docs (cb708093)
required_unless: adds docs and examples for required_unless (ca727b52)

Bug Fixes

Required Args: fixes issue where missing required args are sometimes duplicated in error messages (3beebd81, closes #492)

v2.3.0 (2016-04-18)

Improvements

macros.rs: Added write_nspaces macro (a new version of write_spaces) (9d757e86)
parser.rs:
- Provide a way to create a usage string without the USAGE: title (a91d378b)
- Make Parser's create_usage public allowing to have function outside the parser to generate the help (d51945f8)
- Expose Parser's flags, opts and positionals argument as iterators (9b23e7ee)
src/args: Exposes argument display order by introducing a new Trait (1321630e)
srs/args: Added longest_filter to AnyArg trait (65b3f667)

Features

Authors Macro: adds a crate_authors macro (38fb59ab, closes #447)
HELP:
- implements optional colored help messages (abc8f669, closes #483)
- Add a Templated Help system. (81e121ed)

Bug Fixes

HELP: Adjust Help to semantic changes introduced in 6933b84 (8d23806b)

v2.2.6 (2016-04-11)

Bug Fixes

Arg Groups: fixes bug where arg name isn't printed properly (3019a685, closes #476)

v2.2.5 (2016-04-03)

Bug Fixes

Empty Values: fixes bug where empty values weren't stored (885d166f, closes #470)
Help Message: fixes bug where arg name is printed twice (71acf1d5, closes #472)

v2.2.4 (2016-03-30)

Bug Fixes

fixes compiling with debug cargo feature (d4b55450)
Empty Values: fixes bug where empty values weren't stored (885d166f, closes #470)

v2.2.3 (2016-03-28)

Bug Fixes

Help Subcommand: fixes issue where help and version flags weren't properly displayed (205b07bf, closes #466)

v2.2.2 (2016-03-27)

Bug Fixes

Help Message: fixes bug with wrapping in the middle of a unicode sequence (05365ddc, closes #456)
Usage Strings: fixes small bug where -- would appear needlessly in usage strings (6933b849, closes #461)

2.2.1 (2016-03-16)

Features

Help Message: wraps and aligns the help message of subcommands (813d75d0, closes #452)

Bug Fixes

Help Message: fixes a bug where small terminal sizes causing a loop (1d73b035, closes #453)

v2.2.0 (2016-03-15)

Features

Help Message: can auto wrap and aligning help text to term width (e36af026, closes #428)
Help Subcommand: adds support passing additional subcommands to help subcommand (2c12757b, closes #416)
Opts and Flags: adds support for custom ordering in help messages (9803b51e)
Settings: adds support for automatically deriving custom display order of args (ad86e433, closes #444)
Subcommands: adds support for custom ordering in help messages (7d2a2ed4, closes #442)

Bug Fixes

From Usage: fixes a bug where adding empty lines weren't ignored (c5c58c86)

Documentation

Groups: explains required ArgGroups better (4ff0205b, closes #439)

v2.1.2 (2016-02-24)

Bug Fixes

Nightly: fixes failing nightly build (d752c170, closes #434)

v2.1.1 (2016-02-19)

Documentation

AppSettings: clarifies that AppSettings do not propagate (3c8db0e9, closes #429)
Arg Examples: adds better examples (1e79cccc)

Improvements

Help: adds setting for next line help by arg (066df748, closes #427)

v2.1.0 (2016-02-10)

Features

Default Values: adds support for default values in args (73211952, closes #418)

Documentation

Default Values: adds better examples and notes for default values (9facd74f)

v2.0.6 (2016-02-09)

Improvements

Positional Arguments: now displays value name if appropriate (f0a99916, closes #420)

v2.0.5 (2016-02-05)

Bug Fixes

Multiple Values: fixes bug where number_of_values wasn't respected (72c387da)

v2.0.4 (2016-02-04)

Bug Fixes

adds support for building ArgGroups from standalone YAML (fcbc7e12)
Stop lonely hyphens from causing panic (85b11468, closes #410)
AppSettings: fixes bug where subcmds didn't receive parent ver (a62e4527)

v2.0.3 (2016-02-02)

Improvements

values: adds support for up to u64::max values per arg (c7abf7d7)
occurrences: Allow for more than 256 occurrences of an argument. (3731ddb3)

Features

AppSettings: adds HidePossibleValuesInHelp to skip writing those values (cdee7a0e)

Bug Fixes

value_t_or_exit: fixes typo which causes value_t_or_exit to return a Result (ee96baff)

v2.0.2 (2016-01-31)

Improvements

arg_enum: enum declared with arg_enum returns [&'static str; #] instead of Vec (9c4b8a1a)

Bug Fixes

clap_app! should be gated by unstable, not nightly feature (0c8b84af)
SubCommands: fixed where subcmds weren't recognized after mult args (c19c17a8, closes #405)
Usage Parser: fixes a bug where literal single quotes weren't allowed in help strings (0bcc7120, closes #406)

v2.0.1 (2016-01-30)

Bug Fixes

fixes cargo features to NOT require nightly with unstable features (dcbcc60c, closes #402)

v2.0.0 (2016-01-28)

Improvements

From Usage: vastly improves the usage parser (fa3a2f86, closes #350)

Features

adds support for external subcommands (177fe5cc, closes #372)
adds support values with a leading hyphen (e4d429b9, closes #385)
adds support for turning off the value delimiter (508db850, closes #352)
adds support changing the value delimiter (dafeae8a, closes #353)
adds support for comma separated values (e69da6af, closes #348)
adds support with options with optional values (4555736c, closes #367)
UTF-8: adds support for invalid utf8 in values (c5c59dec, closes #269)
v2: implementing the base of 2.x (a3536054)

Bug Fixes

fixes nightly build with new lints (17599195)
fixes Windows build for 2x release (674c9b48, closes #392)
fixes yaml build for 2x base (adceae64)

Documentation

updates examples for 2x release (1303b360, closes #394)
updates examples for 2x release (0a011f31, closes #394)
updates documentation for v2 release (8d51724e)
updating docs for 2x release (576d0e0e)
README.md:
- updates readme for v2 release (acaba01a, closes #393)
- fix typo and make documentation conspicuous (07b9f614)

BREAKING CHANGES

Fewer lifetimes! Yay!
App<'a, 'b, 'c, 'd, 'e, 'f> => App<'a, 'b>
Arg<'a, 'b, 'c, 'd, 'e, 'f> => Arg<'a, 'b>
ArgMatches<'a, 'b> => ArgMatches<'a>
Simply Renamed
App::arg_group => App::group
App::arg_groups => App::groups
ArgGroup::add => ArgGroup::arg
ArgGroup::add_all => ArgGroup::args
ClapError => Error
struct field ClapError::error_type => Error::kind
ClapResult => Result
ClapErrorType => ErrorKind
Removed Deprecated Functions and Methods
App::subcommands_negate_reqs
App::subcommand_required
App::arg_required_else_help
App::global_version(bool)
App::versionless_subcommands
App::unified_help_messages
App::wait_on_error
App::subcommand_required_else_help
SubCommand::new
App::error_on_no_subcommand
Arg::new
Arg::mutually_excludes
Arg::mutually_excludes_all
Arg::mutually_overrides_with
simple_enum!
Renamed Error Variants
InvalidUnicode => InvalidUtf8
InvalidArgument => UnknownArgument
Usage Parser
Value names can now be specified inline, i.e. -o, --option <FILE> <FILE2> 'some option which takes two files'
There is now a priority of order to determine the name - This is perhaps the biggest breaking change. See the documentation for full details. Prior to this change, the value name took precedence. Ensure your args are using the proper names (i.e. typically the long or short and NOT the value name) throughout the code
ArgMatches::values_of returns an Values now which implements Iterator (should not break any code)
crate_version! returns &'static str instead of String
Using the clap_app! macro requires compiling with the unstable feature because the syntax could change slightly in the future

v1.5.5 (2016-01-04)

Bug Fixes

fixes an issue where invalid short args didn't cause an error (c9bf7e44)
prints the name in version and help instead of binary name (8f3817f6, closes #368)
fixes an intentional panic issue discovered via clippy (ea83a3d4)

v1.5.4 (2015-12-18)

Examples

17_yaml: conditinonally compile 17_yaml example (575de089)

Improvements

clippy improvements (99cdebc2)

Bug Fixes

errors: return correct error type in WrongNumValues error builder (5ba8ba9d)
ArgRequiredElseHelp setting now takes precedence over missing required args (faad83fb, closes #362)

v1.5.3 (2015-11-20)

Bug Fixes

Errors: fixes some instances when errors are missing a final newline (c4d2b171)

v1.5.2 (2015-11-14)

Bug Fixes

Errors: fixes a compiling bug when built on Windows or without the color feature (a35f7634)

v1.5.1 (2015-11-13)

Bug Fixes

Required Args: fixes a bug where required args are not correctly accounted for (f03b88a9, closes #343)

v1.5.0 (2015-11-13)

Bug Fixes

fixes a bug with required positional args in usage strings (c6858f78)

Documentation

FAQ: updates readme with slight changes to FAQ (a4ef0fab)

Improvements

massive errors overhaul (cdc29175)
ArgMatcher: huge refactor and deduplication of code (8988853f)
Errors: errors have been vastly improved (e59bc0c1)
Traits: refactoring some configuration into traits (5800cdec)

Performance

App:
- more BTreeMap->Vec, Opts and SubCmds (bc4495b3)
- changes flags BTreeMap->Vec (d357640f)
- removed unneeded BTreeMap (78971fd6)
- changes BTreeMap to VecMap in some instances (64b921d0)
- removed excess clones (ec0089d4)

v1.4.7 (2015-11-03)

Documentation

Clarify behavior of Arg::multiple with options. (434f497a)
Fix typos and improve grammar. (c1f66b5d)

Bug Fixes

Error Status: fixes bug where --help and --version return non-zero exit code (89b51fdf)

v1.4.6 (2015-10-29)

Features

allows parsing without a binary name for daemons and interactive CLIs (aff89d57, closes #318)

Bug Fixes

Errors: tones down quoting in some error messages (34ce59ed, closes #309)
Help and Version: only builds help and version once (e3be87cf)
Option Args: fixes bug with args and multiple values (c9a9548a, closes #323)
POSIX Overrides: fixes bug where required args are overridden (40ed2b50)
Safe Matches: using ‘safe’ forms of the get_matches family no longer exit the process (c47025dc, closes #256)
Versionless SubCommands: fixes a bug where the -V flag was needlessly built (27df8b9d, closes #329)

Documentation

adds comparison in readme (1a8bf31e, closes #325)

v1.4.5 (2015-10-06)

Bug Fixes

fixes crash on invalid arg error (c78ce128)

v1.4.4 (2015-10-06)

Documentation

clean up some formatting (b7df92d7)
move the crate-level docs to top of the lib.rs file (d7233bf1)
changes doc comments to rustdoc comments (34b601be)
fixes panic in 14_groups example (945b00a0, closes #295)
avoid suggesting star dependencies. (d33228f4)
Rustdoc: adds portions of the readme to main rustdoc page (6f9ee181, closes #293)

Bug Fixes

grammar error in some conflicting option errors (e73b07e1)
Unified Help: sorts both flags and options as a unified category (2a223dad)
Usage: fixes a bug where required args aren't filtered properly (72b453dc, closes #277)
Usage Strings: fixes a bug ordering of elements in usage strings (aaf0d6fe, closes #298)

Features

supports -aValue style options (0e3733e4)
Trailing VarArg: adds opt-in setting for final arg being vararg (27018b18, closes #278)

v1.4.3 (2015-09-30)

Features

allows accessing arg values by group name (c92a4b9e)

Documentation

use links to examples instead of plain text (bb4fe237)

Bug Fixes

Help Message: required args no longer double list in usage (1412e639, closes #277)
Possible Values: possible value validation is restored (f121ae74, closes #287)

v1.4.2 (2015-09-23)

Bug Fixes

Conflicts: fixes bug with conflicts not removing required args (e17fcec5, closes #271)

v1.4.1 (2015-09-22)

Examples

add clap_app quick example (4ba6249c)

Features

Unicode: allows non-panicking on invalid unicode characters (c5bf7ddc)

Documentation

properly names Examples section for rustdoc (87ba5445)
fixes various typos and spelling (f85640f9)
Arg: unhides fields of the Arg struct (931aea88)

Bug Fixes

flush the buffer in App::print_version() (cbc42a37)
Macro benchmarks (13712da1)

v1.4.0 (2015-09-09)

Features

allows printing help message by library consumers (56b95f32)
allows defining hidden args and subcmds (2cab4d03, closes #231)
Builder macro to assist with App/Arg/Group/SubCommand building (443841b0)
Errors: allows consumers to write to stderr and exit on error (1e6403b6)

v1.3.2 (2015-09-08)

Documentation

fixed ErrorKind docs (dd057843)
ErrorKind: changed examples content (b9ca2616)

Bug Fixes

fixes a bug where the help subcommand wasn't overridable (94003db4)

Features

adds ability not consume self when parsing matches and/or exit on help (94003db4)
App: Added ability for users to handle errors themselves (934e6fbb)

v1.3.1 (2015-09-04)

Examples

17_yaml: fixed example (9b848622)

Performance

changes ArgGroup HashSets to Vec (3cb4a48e)
changes BTreeSet for Vec in some instances (baab2e3f)

v1.3.0 (2015-09-01)

Features

YAML: allows building a CLI from YAML files (86cf4c45)
ArgGroups: adds support for building ArgGroups from yaml (ecf88665)
Subcommands: adds support for subcommands from yaml (e415cf78)

Documentation

YAML: adds examples for using YAML to build a CLI (ab41d7f3)
Args from YAML: fixes doc examples (19b348a1)
Examples: adds better usage examples instead of having unused variables (8cbacd88)

Examples

Add AppSettings example (12705079)

Bug Fixes

Unified Help Messages: fixes a crash from this setting and no opts (169ffec1, closes #210)

v1.2.5 (2015-08-27)

Examples

add custom validator example (b9997d1f)
fix indentation (d4f1b740)

Features

Args: allows opts and args to define a name for help and usage msgs (ad962ec4)

v1.2.4 (2015-08-26)

Bug Fixes

Possible Values: fixes a bug where suggestions aren't made when using --long=value format (3d5e9a6c, closes #192)

v1.2.3 (2015-08-24)

Bug Fixes

App, Args: fixed subcommand reqs negation (b41afa8c, closes #188)

v1.2.2 (2015-08-23)

Bug Fixes

fixed confusing error message, also added test for it (fc7a31a7)
App: fixed requirmets overriding (9c135eb7)

v1.2.1 (2015-08-20)

Documentation

README.md: updates for new features (16cf9245)

Features

implements posix compatible conflicts for long args (8c2d48ac)
added overrides to support conflicts in POSIX compatible manner (0b916a00)
Args: allows defining POSIX compatible argument conflicts (d715646e)

Bug Fixes

fixed links in cargo and license buttons (6d9837ad)

Performance

Args and Apps: changes HashSet->Vec in some instances for increased performance (d0c3b379)

v1.2.0 (2015-08-15)

Bug Fixes

fixed misspell and enum name (7df170d7)
fixed use for clap crate (dc3ada73)

Documentation

updates docs for new features (03496547)
fixed docs for previous changes (ade36778)

Improvements

AppSettings: adds ability to add multiple settings at once (4a00e251)

Features

Replace application level settings with enum variants (618dc4e2)
Args: allows for custom argument value validations to be defined (84ae2ddb, closes #170)

v1.1.6 (2015-08-01)

Bug Fixes

fixes two bugs in App when printing newlines in help and subcommands required error (d63c0136)

v1.1.5 (2015-07-29)

Performance

removes some unneeded allocations (93e915df)

v1.1.4 (2015-07-20)

Improvements

Usage Strings displays a [--] when it may be helpful (86c3be85)

Bug Fixes

Macros fixes a typo in a macro generated error message (c9195c5f)
Type Errors fixes formatting of error output when failed type parsing (fe5d95c6)

v1.1.3 (2015-07-18)

Documentation

updates README.md to include lack of color support on Windows (52f81e17)

Bug Fixes

fixes formatting bug which prevented compiling on windows (9cb5dceb, closes #163)

v1.1.2 (2015-07-17)

Bug Fixes

fixes a bug when parsing multiple {n} newlines inside help strings (6d214b54)

v1.1.1 (2015-07-17)

Bug Fixes

fixes a logic bug and allows setting Arg::number_of_values() < 2 (42b6d1fc, closes #161)

v1.1.0 (2015-07-16)

Features

allows creating unified help messages, a la docopt or getopts (52bcd892, closes #158)
allows stating all subcommands should not have --version flags (336c476f, closes #156)
allows setting version number to auto-propagate through subcommands (bc66d3c6, closes #157)

Improvements

Help Strings properly aligns and handles newlines in long help strings (f9800a29, closes #145)

Performance

Help Messages big performance improvements when printing help messages (52bcd892)

Documentation

updates readme with new features (8232f7bb)
fix incorrect code example for App::subcommand_required (8889689d)

v1.0.3 (2015-07-11)

Improvements

Errors writes errors to stderr (cc76ab8c, closes #154)

Documentation

README.md updates example help message to new format (0aca29bd)

v1.0.2 (2015-07-09)

Improvements

Usage re-orders optional arguments and required to natural standard (dc7e1fce, closes #147)

v1.0.1 (2015-07-08)

Bug Fixes

allows empty values when using --long='' syntax (083f82d3, closes #151)

v1.0.0 (2015-07-08)

Documentation

README.md adds new features to what's new list (938f7f01)
README.md use with_name for subcommands (28b7e316)

Features

args can now be parsed from arbitrary locations, not just std::env::args() (75312528)

v1.0.0-beta (2015-06-30)

Features

allows waiting for user input on error (d0da3bdd, closes #140)
Help allows one to fully override the auto-generated help message (26d5ae3e, closes #141)

Documentation

adds “whats new” section to readme (ff149a29)

Improvements

removes deprecated functions in prep for 1.0 (274484df)

v0.11.0 (2015-06-17) - BREAKING CHANGE

Documentation

updates docs to new version flag defaults (ebf442eb)

Features

Help and Version default short for version is now -V but can be overridden (only breaks manual documentation) (BREAKING CHANGE eb1d9320)

v0.10.5 (2015-06-06)

Bug Fixes

Global Args global arguments propagate fully now (1f377960, closes #137)

v0.10.4 (2015-06-06)

Bug Fixes

Global Args global arguments propagate fully now (8f2c0160, closes #137)

v0.10.3 (2015-05-31)

Bug Fixes

Global Args fixes a bug where globals only transfer to one subcommand (a37842ee, closes #135)

v0.10.2 (2015-05-30)

Improvements

Binary Names allows users to override the system determined bin name (2191fe94, closes #134)

Documentation

adds contributing guidelines (6f76bd0a)

v0.10.1 (2015-05-26)

Features

can now specify that an app or subcommand should display help on no args or subcommands (29ca7b2f, closes #133)

v0.10.0 (2015-05-23)

Features

Global Args allows args that propagate down to child commands (2bcc6137, closes #131)

Improvements

Colors implements more structured colored output (d6c3ed54, closes #129)

Deprecations

SubCommand/App several methods and functions for stable release (28b73855)

Documentation

updates for deprecations and new features (743eefe8)

v0.9.2 (2015-05-20)

Bug Fixes

help allows parent requirements to be ignored with help and version (52218cc1, closes #124)

v0.9.1 (2015-05-18)

Bug Fixes

help fixes a bug where requirements are included as program name in help and version (08ba3f25)

v0.9.0 (2015-05-17)

Improvements

usage usage strings now include parent command requirements (dd8f21c7, closes #125)
args allows consumer of clap to decide if empty values are allowed or not (ab4ec609, closes #122)

Features

subcommands
- allows optionally specifying that no subcommand is an error (7554f238, closes #126)
- subcommands can optionally negate parent requirements (4a4229f5, closes #123)

v0.8.6 (2015-05-17)

Bug Fixes

args - can now be parsed as a value for an argument (bc12e78e, closes #121)

v0.8.5 (2015-05-15)

Bug Fixes

macros makes macro errors consistent with others (0c264a8c, closes #118)

Features

macros
- arg_enum! and simple_enum! provide a Vec<&str> of variant names (30fa87ba, closes #119)
- arg_enum! and simple_enum! auto-implement Display (d1219f0d, closes #120)

v0.8.4 (2015-05-12)

Bug Fixes

suggestions --help and --version now get suggestions (d2b3b1fa, closes #116)

v0.8.3 (2015-05-10)

Bug Fixes

usage groups unfold their members in usage strings (55d15582, closes #114)

Performance

usage removes unneeded allocations (fd53cd18)

v0.8.2 (2015-05-08)

Bug Fixes

usage strings positional arguments are presented in index order (eb0e374e, closes #112)

v0.8.1 (2015-05-06)

Bug Fixes

subcommands stops parsing multiple values when subcommands are found (fc79017e, closes #109)

Improvements

color reduces color in error messages (aab44cca, closes #110)
suggestions adds suggested arguments to usage strings (99447414)

v0.8.0 (2015-05-06)

Bug Fixes

did-you-mean for review (0535cfb0)
Positional positionals were ignored if they matched a subcmd, even after ‘--’ (90e7b081)
help fixes bug where space between arg and help is too long (632fb115)

Features

from_usage adds ability to add value names or num of vals in usage string (3d581976, closes #98)
did-you-mean
- gate it behind ‘suggestions’ (c0e38351)
- for possible values (1cc2deb2)
- for long flags (i.e. --long) (52a0b850)
- for subcommands (06e869b5)
Flags adds suggestions functionality (8745071c)
errors colorizes output red on error (f8b26b13)

Improvements

arg_enum allows ascii case insensitivity for enum variants (b249f965, closes #104)
clap-test simplified make test invocation (d17dcb29)

Documentation

README adds details about optional and new features (960389de)
clap fix typos caught by codespell (8891d929)
from_usage explains new usage strings with multiple values (05476fc6)

v0.7.6 (2015-05-05)

Improvements

Options adds number of values to options in help/usage (c1c993c4)

Features

from_usage adds ability to add value names or num of vals in usage string (ad55748c, closes #98)

Bug Fixes

MultipleValues properly distinguishes between multiple values and multiple occurrences (dd2a7564, closes #99)
help fixes tab alignment with multiple values (847001ff)

Documentation

from_usage explains new usage strings with multiple values (5a3a42df)

v0.7.5 (2015-05-04)

Bug Fixes

Options fixes bug where options with no value don't error out (a1fb94be)

v0.7.4 (2015-05-03)

Bug Fixes

Options fixes a bug where option arguments in succession get their values skipped (f66334d0)

v0.7.3 (2015-05-03)

Bug Fixes

RequiredValues fixes a bug where missing values are parsed as missing arguments (93c4a723)

Improvements

ErrorMessages improves error messages and corrections (a29c3983)
ArgGroups improves requirement and confliction support for groups (c236dc5f)

v0.7.2 (2015-05-03)

Bug Fixes

RequiredArgs fixes bug where required-by-default arguments are not listed in usage (12aea961, closes #96)

v0.7.1 (2015-05-01)

Bug Fixes

MultipleValues stops evaluating values if the max or exact number of values was reached (86d92c9f)

v0.7.0 (2015-04-30) - BREAKING CHANGE

Bug Fixes

from_usage removes bug where usage strings have no help text (ad4e5451, closes #83)

Features

MultipleValues
- add support for minimum and maximum number of values (53f6b8c9)
- adds support limited number and named values (ae09f05e)
- implement shorthand for options with multiple values (6669f0a9)
arg allow other types besides Vec for multiple value settings (BREAKING CHANGE 0cc2f698, closes #87)
usage implement smart usage strings on errors (d77048ef, closes #88)

v0.6.9 (2015-04-29)

Bug Fixes

from_usage removes bug where usage strings have no help text (ad4e5451, closes #83)

0.6.8 (2015-04-27)

Bug Fixes

help change long help --long=long -> --long (1e25abfc)
RequiredArgs required by default args should no longer be required when their exclusions are present (4bb4c3cc)

Features

ArgGroups add ability to create arg groups (09eb4d98)

v0.6.7 (2015-04-22)

Bug Fixes

from_usage fix bug causing args to not be required (b76129e9)

Features

apps add ability to display additional help info after auto-gen'ed help msg (65cc259e)

v0.6.6 (2015-04-19)

Bug Fixes

from_usage tabs and spaces should be treated equally (4fd44181)

Features

macros.rs add macro to get version from Cargo.toml (c630969a)

v0.6.5 (2015-04-19)

Bug Fixes

macros.rs fix use statements for trait impls (86e4075e)

v0.6.4 (2015-04-17)

Features

macros add ability to create enums pub or priv with derives (2c499f80)

v0.6.3 (2015-04-16)

Features

macros add macro to create custom enums to use as types (fb672aff)

v0.6.2 (2015-04-14)

Features

macros
- add ability to get multiple typed values or exit (0b87251f)
- add ability to get a typed multiple values (e243fe38)
- add convenience macro to get a typed value or exit (4b7cd3ea)
- add convenience macro to get a typed value (8752700f)

v0.6.1 (2015-04-13)

Bug Fixes

from_usage trim all whitespace before parsing (91d29045)

v0.6.0 (2015-04-13)

Bug Fixes

tests fix failing doc tests (3710cd69)

Features

app add support for building args from usage strings (d5d48bcf)
args add ability to create basic arguments from a usage string (ab409a8f)

v0.5.14 (2015-04-10)

Bug Fixes

usage
- remove unneeded space (51372789)
- remove warning about unused variables (ba817b9d)

Features

usage add ability to get usage string for subcommands too (3636afc4)

v0.5.13 (2015-04-09)

Features

SubCommands add method to get name and subcommand matches together (64e53928)
ArgMatches add method to get default usage string (02462150)

v0.5.12 (2015-04-08)

Features

help sort arguments by name so as to not display a random order (f4b2bf57)

v0.5.11 (2015-04-08)

Bug Fixes

flags fix bug not allowing users to specify -v or -h (90e72cff)

v0.5.10 (2015-04-08)

Bug Fixes

help fix spacing when option argument has not long version (ca17fa49)

v0.5.9 (2015-04-08)

Bug Fixes

positional args all previous positional args become required when a latter one is required (c14c3f31, closes #50)
clap remove unstable features for Rust 1.0 (9abdb438)
args improve error messages for arguments with mutual exclusions (18dbcf37, closes #51)

v0.5.8 (2015-04-08)

Bug Fixes

option args fix bug in getting the wrong number of occurrences for options (82ad6ad7)
help fix formatting for option arguments with no long (e8691004)
flags add assertion to catch flags with specific value sets (a0a2a40f, closes #52)
args improve error messages for arguments with mutual exclusions (bff945fc, closes #51)
tests add missing .takes_value(true) to option2 (bdb0e88f)
positional args all previous positional args become required when a latter one is required (343d47dc, closes #50)

v0.5.7 (2015-04-08)

Bug Fixes

args fix bug in arguments who are required and mutually exclusive (6ceb88a5)

v0.5.6 (2015-04-08)

Bug Fixes

help fix formatting of help and usage (28691b52)

v0.5.5 (2015-04-08)

Bug Fixes

help fix formatting of help for flags and options (6ec10115)

v0.5.4 (2015-04-08)

Features

help add ‘...’ to indicate multiple values supported (297ddba7)

v0.5.3 (2015-04-08)

Features

positionals
- add assertions for positional args with multiple vals (b7fa72d4)
- add support for multiple values (80784009)

v0.5.2 (2015-04-08)

Bug Fixes

apps allow use of hyphens in application and subcommand names (da549dcb)

v0.5.1 (2015-04-08)

Bug Fixes

args determine if the only arguments allowed are also required (0a09eb36)

v0.5.0 (2015-04-08)

Features

args add support for a specific set of allowed values on options or positional arguments (270eb889)

v0.4.18 (2015-04-08)

Bug Fixes

usage display required args in usage, even if only required by others (1b7316d4)

Features

subcommands properly list subcommands in help and usage (4ee02344)

v0.4.17 (2015-04-08)

Bug Fixes

tests remove cargo test from claptests makefile (1cf73817)

v0.4.16 (2015-04-08)

Bug Fixes

option fix bug with option occurrence values (9af52e93)
tests fix testing script bug and formatting (d8f03a55)

Features

arg allow lifetimes other than 'static in arguments (9e8c1fb9)