blob: 6e25d93624ddb6840c65ee5f4e7c3d845c653f24 [file] [log] [blame]
## Copyright (c) 2012 The WebM project authors. All Rights Reserved.
## Use of this source code is governed by a BSD-style license
## that can be found in the LICENSE file in the root of the source
## tree. An additional intellectual property rights grant can be found
## in the file PATENTS. All contributing project authors may
## be found in the AUTHORS file in the root of the source tree.
"""Performs style checking on each diff hunk."""
import getopt
import os
import StringIO
import subprocess
import sys
import diff
LONG_OPTIONS = ["help"]
TOPLEVEL_CMD = ["git", "rev-parse", "--show-toplevel"]
DIFF_CMD = ["git", "diff"]
DIFF_INDEX_CMD = ["git", "diff-index", "-u", "HEAD", "--"]
SHOW_CMD = ["git", "show"]
CPPLINT_FILTERS = ["-readability/casting"]
class Usage(Exception):
class SubprocessException(Exception):
def __init__(self, args):
msg = "Failed to execute '%s'"%(" ".join(args))
super(SubprocessException, self).__init__(msg)
class Subprocess(subprocess.Popen):
"""Adds the notion of an expected returncode to Popen."""
def __init__(self, args, expected_returncode=0, **kwargs):
self._args = args
self._expected_returncode = expected_returncode
super(Subprocess, self).__init__(args, **kwargs)
def communicate(self, *args, **kwargs):
result = super(Subprocess, self).communicate(*args, **kwargs)
if self._expected_returncode is not None:
ok = self.returncode in self._expected_returncode
except TypeError:
ok = self.returncode == self._expected_returncode
if not ok:
raise SubprocessException(self._args)
return result
def main(argv=None):
if argv is None:
argv = sys.argv
opts, args = getopt.getopt(argv[1:], SHORT_OPTIONS, LONG_OPTIONS)
except getopt.error, msg:
raise Usage(msg)
# process options
for o, _ in opts:
if o in ("-h", "--help"):
print __doc__
if args and len(args) > 1:
print __doc__
# Find the fully qualified path to the root of the tree
tl = Subprocess(TOPLEVEL_CMD, stdout=subprocess.PIPE)
tl = tl.communicate()[0].strip()
# See if we're working on the index or not.
if args:
diff_cmd = DIFF_CMD + [args[0] + "^!"]
diff_cmd = DIFF_INDEX_CMD
# Build the command line to execute cpplint
cpplint_cmd = [os.path.join(tl, "tools", ""),
"--filter=" + ",".join(CPPLINT_FILTERS),
# Get a list of all affected lines
file_affected_line_map = {}
p = Subprocess(diff_cmd, stdout=subprocess.PIPE)
stdout = p.communicate()[0]
for hunk in diff.ParseDiffHunks(StringIO.StringIO(stdout)):
filename = hunk.right.filename[2:]
if filename not in file_affected_line_map:
file_affected_line_map[filename] = set()
# Run each affected file through cpplint
lint_failed = False
for filename, affected_lines in file_affected_line_map.iteritems():
if filename.split(".")[-1] not in ("c", "h", "cc"):
if args:
# File contents come from git
show_cmd = SHOW_CMD + [args[0] + ":" + filename]
show = Subprocess(show_cmd, stdout=subprocess.PIPE)
lint = Subprocess(cpplint_cmd, expected_returncode=(0, 1),
stdin=show.stdout, stderr=subprocess.PIPE)
lint_out = lint.communicate()[1]
# File contents come from the working tree
lint = Subprocess(cpplint_cmd, expected_returncode=(0, 1),
stdin=subprocess.PIPE, stderr=subprocess.PIPE)
stdin = open(os.path.join(tl, filename)).read()
lint_out = lint.communicate(stdin)[1]
for line in lint_out.split("\n"):
fields = line.split(":")
if fields[0] != "-":
warning_line_num = int(fields[1])
if warning_line_num in affected_lines:
print "%s:%d:%s"%(filename, warning_line_num,
lint_failed = True
# Set exit code if any relevant lint errors seen
if lint_failed:
return 1
except Usage, err:
print >>sys.stderr, err
print >>sys.stderr, "for help use --help"
return 2
if __name__ == "__main__":