hterm: support mouse wheel scrolling with DECCKM

Many applications don't support mouse reporting modes (DECSET 1000/1002).
To support scrolling when DECCKM (application cursor) is active, some
terminal emulators (like konsole & gnome-terminal) generate arrow key
events (up & down).  Let's have hterm support that mode too.

If DECCKM is not active (the default e.g. a shell prompt), scroll events
will scroll the terminal buffer (i.e. what happens already today).  But
if DECCKM is active (in applications like less/man and vim/nano), then
scroll events will emit arrow key presses and cause the application to
scroll through its own buffer.

BUG=chromium:323274

Change-Id: I6fa989523981df84296215b1be89b25e47a77762
Reviewed-on: https://chromium-review.googlesource.com/518083
Reviewed-by: Brandon Gilmore <varz@google.com>
Tested-by: Mike Frysinger <vapier@chromium.org>
2 files changed
tree: 14cfe46b9455bcf25736cd323daffd04baa66ba2
  1. hterm/
  2. libdot/
  3. nassh/
  4. saltpig/
  5. ssh_client/
  6. wam/
  7. wash/
  8. .gitignore
  9. HACK.md
  10. LICENSE
  11. package.json
  12. README.md
README.md

Hello

This repository contains the libdot JavaScript library and some web applications that make use of it.

The official copy of this repository is hosted at https://chromium.googlesource.com/apps/libapps.

There is also a mirror on github at https://github.com/libapps/libapps-mirror. Keep in mind that this mirror may occasionally be behind the official repository.

All changes must go through the Gerrit code review server on https://chromium-review.googlesource.com. Github pull requests cannot be accepted. Please see the HACK.md document in this directory for the details.

Top level directories

  • libdot/ is a small set of JS libraries initially developed as part of hterm, now available as shared code. It provides a base layer for web applications. The code is intended to work in any modern browser, in either a plain web page or a “privileged” environment such as a Chrome platform application or Firefox extension. In practice, it's only been put to use in Chrome platform applications so far.

  • hterm/ is a JS library that provides a terminal emulator. It is reasonably fast, reasonably correct, and reasonably portable across browsers.

  • nassh/ is the Secure Shell Chrome App (currently a “v1.5” app, soon to become a “v2” or platform app) that combines hterm with a NaCl build of OpenSSH to provide a PuTTY-like app for Chrome users.

  • ssh_client/ is the NaCl port of OpenSSH. It is used by nassh to create the Secure Shell App.

  • wash/ is a library for cross-origin virtual filesystems, similar to the Plan 9 filesystem. This directory also contains a simple bash-like shell environment for exploring these filesystems. The code in this directory is a work-in-progress.