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#!/usr/bin/python
## 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
SHORT_OPTIONS = "h"
LONG_OPTIONS = ["help"]
TOPLEVEL_CMD = ["git", "rev-parse", "--show-toplevel"]
DIFF_CMD = ["git", "diff"]
DIFF_INDEX_CMD = ["git", "diff-index", "-u", "--cached", "HEAD", "--"]
SHOW_CMD = ["git", "show"]
CPPLINT_FILTERS = ["-readability/casting", "-runtime/int"]
class Usage(Exception):
pass
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:
try:
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
try:
try:
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__
sys.exit(0)
if args and len(args) > 1:
print __doc__
sys.exit(0)
# 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] + "^!"]
else:
diff_cmd = DIFF_INDEX_CMD
# Build the command line to execute cpplint
cpplint_cmd = [os.path.join(tl, "tools", "cpplint.py"),
"--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()
file_affected_line_map[filename].update(hunk.right.delta_line_nums)
# 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"):
continue
show_cmd = SHOW_CMD + [":" + 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]
for line in lint_out.split("\n"):
fields = line.split(":")
if fields[0] != "-":
continue
warning_line_num = int(fields[1])
if warning_line_num in affected_lines:
print "%s:%d:%s"%(filename, warning_line_num,
":".join(fields[2:]))
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__":
sys.exit(main())
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