contrib/check-code.py
author Mads Kiilerich <mads@kiilerich.com>
Mon, 08 Mar 2010 03:07:35 +0100
branchstable
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permissions -rwxr-xr-x
test-merge-default and check-code.py: No "export x=x" in sh
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#!/usr/bin/env python
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#
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# check-code - a style and portability checker for Mercurial
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#
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# Copyright 2010 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import sys, re, glob
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def repquote(m):
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    t = re.sub(r"\w", "x", m.group(2))
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    t = re.sub(r"[^\sx]", "o", t)
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    return m.group(1) + t + m.group(1)
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def repcomment(m):
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    return m.group(1) + "#" * len(m.group(2))
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def repccomment(m):
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    t = re.sub(r"((?<=\n) )|\S", "x", m.group(2))
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    return m.group(1) + t + "*/"
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def repcallspaces(m):
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    t = re.sub(r"\n\s+", "\n", m.group(2))
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    return m.group(1) + t
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def repinclude(m):
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    return m.group(1) + "<foo>"
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def rephere(m):
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    t = re.sub(r"\S", "x", m.group(2))
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    return m.group(1) + t
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testpats = [
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    (r'(pushd|popd)', "don't use 'pushd' or 'popd', use 'cd'"),
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    (r'\W\$?\(\([^\)]*\)\)', "don't use (()) or $(()), use 'expr'"),
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    (r'^function', "don't use 'function', use old style"),
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    (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),
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    (r'echo.*\\n', "don't use 'echo \\n', use printf"),
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    (r'^diff.*-\w*N', "don't use 'diff -N'"),
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    (r'(^| )wc[^|]*$', "filter wc output"),
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    (r'head -c', "don't use 'head -c', use 'dd'"),
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    (r'ls.*-\w*R', "don't use 'ls -R', use 'find'"),
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    (r'printf.*\\\d\d\d', "don't use 'printf \NNN', use Python"),
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    (r'printf.*\\x', "don't use printf \\x, use Python"),
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    (r'\$\(.*\)', "don't use $(expr), use `expr`"),
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    (r'rm -rf \*', "don't use naked rm -rf, target a directory"),
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    (r'(^|\|\s*)grep (-\w\s+)*[^|]*[(|]\w',
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     "use egrep for extended grep syntax"),
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    (r'/bin/', "don't use explicit paths for tools"),
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    (r'\$PWD', "don't use $PWD, use `pwd`"),
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    (r'[^\n]\Z', "no trailing newline"),
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    (r'export.*=', "don't export and assign at once"),
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]
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testfilters = [
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    (r"( *)(#([^\n]*\S)?)", repcomment),
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    (r"<<(\S+)((.|\n)*?\n\1)", rephere),
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]
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pypats = [
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    (r'^\s*\t', "don't use tabs"),
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    (r'\S;\s*\n', "semicolon"),
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    (r'\w,\w', "missing whitespace after ,"),
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    (r'\w[+/*\-<>]\w', "missing whitespace in expression"),
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    (r'^\s+\w+=\w+[^,)]$', "missing whitespace in assignment"),
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    (r'.{85}', "line too long"),
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    (r'[^\n]\Z', "no trailing newline"),
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#    (r'^\s+[^_ ][^_. ]+_[^_]+\s*=', "don't use underbars in identifiers"),
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#    (r'\w*[a-z][A-Z]\w*\s*=', "don't use camelcase in identifiers"),
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    (r'^\s*(if|while|def|class|except|try)\s[^[]*:\s*[^\]#\s]+',
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     "linebreak after :"),
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    (r'class\s[^(]:', "old-style class, use class foo(object)"),
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    (r'^\s+del\(', "del isn't a function"),
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    (r'^\s+except\(', "except isn't a function"),
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    (r',]', "unneeded trailing ',' in list"),
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#    (r'class\s[A-Z][^\(]*\((?!Exception)',
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#     "don't capitalize non-exception classes"),
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#    (r'in range\(', "use xrange"),
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#    (r'^\s*print\s+', "avoid using print in core and extensions"),
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    (r'[\x80-\xff]', "non-ASCII character literal"),
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    (r'("\')\.format\(', "str.format() not available in Python 2.4"),
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    (r'^\s*with\s+', "with not available in Python 2.4"),
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    (r'if\s.*\selse', "if ... else form not available in Python 2.4"),
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    (r'([\(\[]\s\S)|(\S\s[\)\]])', "gratuitous whitespace in () or []"),
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#    (r'\s\s=', "gratuitous whitespace before ="),
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    (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=)\S', "missing whitespace around operator"),
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    (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=)\s', "missing whitespace around operator"),
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    (r'\s(\+=|-=|!=|<>|<=|>=|<<=|>>=)\S', "missing whitespace around operator"),
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    (r'[^+=*!<>&| -](\s=|=\s)[^= ]', "wrong whitespace around ="),
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    (r'raise Exception', "don't raise generic exceptions"),
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    (r'ui\.(status|progress|write|note)\([\'\"]x', "unwrapped ui message"),
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]
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pyfilters = [
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    (r"""(''')(([^']|\\'|'{1,2}(?!'))*)'''""", repquote),
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    (r'''(""")(([^"]|\\"|"{1,2}(?!"))*)"""''', repquote),
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    (r'''(?<!")(")(([^"\n]|\\")+)"(?!")''', repquote),
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    (r"""(?<!')(')(([^'\n]|\\')+)'(?!')""", repquote),
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    (r"( *)(#([^\n]*\S)?)", repcomment),
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]
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cpats = [
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    (r'//', "don't use //-style comments"),
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    (r'^  ', "don't use spaces to indent"),
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    (r'\S\t', "don't use tabs except for indent"),
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    (r'(\S\s+|^\s+)\n', "trailing whitespace"),
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    (r'.{85}', "line too long"),
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    (r'(while|if|do|for)\(', "use space after while/if/do/for"),
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    (r'return\(', "return is not a function"),
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    (r' ;', "no space before ;"),
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    (r'\w+\* \w+', "use int *foo, not int* foo"),
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    (r'\([^\)]+\) \w+', "use (int)foo, not (int) foo"),
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    (r'\S+ (\+\+|--)', "use foo++, not foo ++"),
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    (r'\w,\w', "missing whitespace after ,"),
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    (r'\w[+/*]\w', "missing whitespace in expression"),
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    (r'^#\s+\w', "use #foo, not # foo"),
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    (r'[^\n]\Z', "no trailing newline"),
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]
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cfilters = [
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    (r'(/\*)(((\*(?!/))|[^*])*)\*/', repccomment),
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    (r'''(?<!")(")(([^"]|\\")+"(?!"))''', repquote),
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    (r'''(#\s*include\s+<)([^>]+)>''', repinclude),
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    (r'(\()([^)]+\))', repcallspaces),
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]
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checks = [
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    ('python', r'.*\.(py|cgi)$', pyfilters, pypats),
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    ('test script', r'(.*/)?test-[^.~]*$', testfilters, testpats),
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    ('c', r'.*\.c$', cfilters, cpats),
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]
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if len(sys.argv) == 1:
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    check = glob.glob("*")
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else:
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    check = sys.argv[1:]
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for f in check:
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    for name, match, filters, pats in checks:
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        fc = 0
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        if not re.match(match, f):
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            continue
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        pre = post = open(f).read()
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        if "no-" + "check-code" in pre:
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            break
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        for p, r in filters:
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            post = re.sub(p, r, post)
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        # print post # uncomment to show filtered version
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        z = enumerate(zip(pre.splitlines(), post.splitlines(True)))
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        for n, l in z:
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            if "check-code" + "-ignore" in l[0]:
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                continue
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            lc = 0
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            for p, msg in pats:
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                if re.search(p, l[1]):
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                    if not lc:
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                        print "%s:%d:" % (f, n + 1)
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                        print " > %s" % l[0]
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                    print " %s" % msg
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                    lc += 1
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                    fc += 1
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            if fc == 15:
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                print " (too many errors, giving up)"
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                break
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        break