Provide script 'check-style' for validating patches
Run the script with a patch file as the first argument in order to validate the patch in terms of coding style, like so: ./tools/check-style my-patch.diff As a shortcut, you can also check current changes: ./tools/check-style .
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Christian Dywan
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tools/check-style
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tools/check-style
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#! /usr/bin/env python
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# Copyright (C) 2010 Christian Dywan <christian@twotoasts.de>
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# Copyright (C) 2010 Arno Renevier <arno@renevier.net>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# See the file COPYING for the full license text.
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#
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# check-style: Verify C source code according to coding style.
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import glob, re, string, subprocess, sys, os
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if len (sys.argv) < 2:
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name = os.path.basename (sys.argv[0])
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print ('Usage:\n ' + name + ' FILENAMES\n'
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' Pass "-" to read stdin, eg. "cat my-feature.diff | ' + name + ' -"\n'
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' Pass "." to mean "git diff ^HEAD | ' + name + ' -"')
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sys.exit (1)
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# Coding style violations
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violations = [
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['.{101}', 'Line longer than 100 columns'],
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['^[ ]{1,3}[^ ]+', 'Indentation is less than 4 spaces'],
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# FIXME: Don't match empty strings
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# FIXME: Don't match indented function arguments
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# ['^(?!(([ ]{4})*[^ ]+))', 'Indentation is not 4 spaces'],
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['.*[ ]+$', 'Trailing whitespace'],
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[r"\t+", 'Tabs instead of spaces'],
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["[^0-9],[^ ][^0-9]", 'No space after comma'],
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# ['(([A-Z][a-z]+)+)\*?[ ][a-z]{2,}', 'Good variable name'],
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# ['(g?char|g(boolean|pointer))\*?[ ][a-z]{2,}', 'Good variable name'],
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# ['(g?int|guint)[ ][a-z]+', 'Good iterator name'],
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# ['(struct)[ ]+[_]?([A-Z][a-z]+)+', 'Good type name'],
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['^\s*\w+(?<!\\breturn)\s+\*\s*\w*\s*[;,]', 'Space between type and asterisk'],
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["(\w[+|-|*|/|<|>|=]{1,2}\w)", 'No space around operators'],
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["\/\*[^ *\n]", 'No space after open comment'],
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['[^ *]\*\/', 'No space before close comment'],
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['\)\{', 'No space between ) and {'],
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[';[^ \s]', 'No space or newline after semicolon'],
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# ['(if)( \([^ ].*[^ ]\))$', 'Good if style'],
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['^#\s+(if(n?def)?|define|else|elif)[ ].*$', 'Space between # and cpp'],
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[r'^\s*\*\w+(\+\+|--);', 'Invalid increment, use (*i)++ or *i += 1'],
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['asctime|ctime|getgrgid|getprgnam|getlogin \
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|getpwnam|getpwuid|gmtime|localtime \
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|rand|readdir|strtok|ttyname', 'Not thread-safe posix, use _r variant'],
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]
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# No validation for strings, comments, includes
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omissions = [
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[r'["]{1}.*["]', 'STRING'],
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["'\\\?.'", 'CHAR'],
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["^\s*\/\*.*\*\/\s*$", 'COMMENT'],
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['#include <.*>', 'INCLUDE'],
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]
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# Output format
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fmt = '%s - %d: %s'
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# Pre-compile expressions
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for violation in violations:
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violation[0] = re.compile (violation[0])
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for omission in omissions:
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omission[0] = re.compile (omission[0])
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for filename_or_glob in sys.argv[1:]:
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if filename_or_glob == '-':
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handles = [sys.stdin]
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else:
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handles = []
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for filename in glob.glob (filename_or_glob):
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if os.path.isdir (filename):
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gitdiff = subprocess.Popen (['git', 'diff', '^HEAD',
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'--relative', filename], stdout=subprocess.PIPE)
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handles.append (gitdiff.stdout)
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else:
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handles.append (open (filename))
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if not handles:
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print (filename_or_glob + ' not found')
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sys.exit (1)
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for handle in handles:
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previous = ''
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i = 0
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mode = ''
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filename = handle.name
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comment = False
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curly = []
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for line in handle:
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line = line[:-1]
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i += 1
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# Parse diff, only validate modified lines
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if i == 1 and 'diff' in line:
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mode = 'diff'
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if mode == 'diff':
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if line[:3] == '+++':
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filename = line[6:]
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comment = False
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curly = []
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continue
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if line[:2] == '@@':
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i = int (line.split (' ')[2].split (',')[0][1:]) - 1
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curly = []
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if line[0] == '-':
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i = i -1
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if line[0] != '+':
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continue
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line = line[1:]
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# Spurious blank lines
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if previous == line == '':
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print (fmt % (filename, i, 'Spurious blank line'))
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previous = line
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continue
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previous = line
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# Skip multi-line comment blocks
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if '/*' in line and not '*/' in line:
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comment = True
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if comment:
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if '*/' in line and not '/*' in line:
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comment = False
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continue
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cleaned = line
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for omission in omissions:
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cleaned = omission[0].sub (omission[1], cleaned)
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# Validate curly bracket indentation
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if '{' in cleaned and not '}' in cleaned:
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curly.append ((cleaned.index ('{'), cleaned))
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if '}' in cleaned and not '{' in cleaned and not '},' in cleaned:
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if len (curly) == 0 or curly[-1][0] != cleaned.index ('}'):
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print (fmt % (filename, i, 'Misindented curly bracket'))
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print (curly[-1][1])
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print (line)
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curly.pop()
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continue
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curly.pop()
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# Validate preprocessor indentation
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# FIXME: Don't warn if the *following* line is a curly
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cpp = cleaned.find ('#if')
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if cpp != -1:
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if len (curly) != 0 and cpp != curly[-1][0] + 4:
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print (fmt % (filename, i, 'Misindented preprocessor #if'))
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print (curly[-1][1])
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print (line)
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violated = False
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for violation in violations:
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if violation[0].search (cleaned):
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violated = True
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print (fmt % (filename, i, violation[1]))
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if violated:
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print (line)
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