contrib/check-code.py

histedit: replaces patching logic by merges

The old and fragile patching logic is replaced by smart merges (as rebase and
graft do). This should prevents some conflicts and smoother human resolution.

For this purpose the "foldchanges" function is renamed to "applychanges" and
handle a single revision only.

#!/usr/bin/env python
#
# check-code - a style and portability checker for Mercurial
#
# Copyright 2010 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import re, glob, os, sys
import keyword
import optparse

def repquote(m):
    t = re.sub(r"\w", "x", m.group('text'))
    t = re.sub(r"[^\s\nx]", "o", t)
    return m.group('quote') + t + m.group('quote')

def reppython(m):
    comment = m.group('comment')
    if comment:
        return "#" * len(comment)
    return repquote(m)

def repcomment(m):
    return m.group(1) + "#" * len(m.group(2))

def repccomment(m):
    t = re.sub(r"((?<=\n) )|\S", "x", m.group(2))
    return m.group(1) + t + "*/"

def repcallspaces(m):
    t = re.sub(r"\n\s+", "\n", m.group(2))
    return m.group(1) + t

def repinclude(m):
    return m.group(1) + "<foo>"

def rephere(m):
    t = re.sub(r"\S", "x", m.group(2))
    return m.group(1) + t


testpats = [
  [
    (r'pushd|popd', "don't use 'pushd' or 'popd', use 'cd'"),
    (r'\W\$?\(\([^\)\n]*\)\)', "don't use (()) or $(()), use 'expr'"),
    (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),
    (r'sed.*-i', "don't use 'sed -i', use a temporary file"),
    (r'\becho\b.*\\n', "don't use 'echo \\n', use printf"),
    (r'echo -n', "don't use 'echo -n', use printf"),
    (r'(^| )wc[^|]*$\n(?!.*\(re\))', "filter wc output"),
    (r'head -c', "don't use 'head -c', use 'dd'"),
    (r'sha1sum', "don't use sha1sum, use $TESTDIR/md5sum.py"),
    (r'ls.*-\w*R', "don't use 'ls -R', use 'find'"),
    (r'printf.*\\([1-9]|0\d)', "don't use 'printf \NNN', use Python"),
    (r'printf.*\\x', "don't use printf \\x, use Python"),
    (r'\$\(.*\)', "don't use $(expr), use `expr`"),
    (r'rm -rf \*', "don't use naked rm -rf, target a directory"),
    (r'(^|\|\s*)grep (-\w\s+)*[^|]*[(|]\w',
     "use egrep for extended grep syntax"),
    (r'/bin/', "don't use explicit paths for tools"),
    (r'[^\n]\Z', "no trailing newline"),
    (r'export.*=', "don't export and assign at once"),
    (r'^source\b', "don't use 'source', use '.'"),
    (r'touch -d', "don't use 'touch -d', use 'touch -t' instead"),
    (r'ls +[^|\n-]+ +-', "options to 'ls' must come before filenames"),
    (r'[^>\n]>\s*\$HGRCPATH', "don't overwrite $HGRCPATH, append to it"),
    (r'^stop\(\)', "don't use 'stop' as a shell function name"),
    (r'(\[|\btest\b).*-e ', "don't use 'test -e', use 'test -f'"),
    (r'^alias\b.*=', "don't use alias, use a function"),
    (r'if\s*!', "don't use '!' to negate exit status"),
    (r'/dev/u?random', "don't use entropy, use /dev/zero"),
    (r'do\s*true;\s*done', "don't use true as loop body, use sleep 0"),
    (r'^( *)\t', "don't use tabs to indent"),
  ],
  # warnings
  [
    (r'^function', "don't use 'function', use old style"),
    (r'^diff.*-\w*N', "don't use 'diff -N'"),
    (r'\$PWD', "don't use $PWD, use `pwd`"),
    (r'^([^"\'\n]|("[^"\n]*")|(\'[^\'\n]*\'))*\^', "^ must be quoted"),
  ]
]

testfilters = [
    (r"( *)(#([^\n]*\S)?)", repcomment),
    (r"<<(\S+)((.|\n)*?\n\1)", rephere),
]

uprefix = r"^  \$ "
utestpats = [
  [
    (r'^(\S.*||  [$>] .*)[ \t]\n', "trailing whitespace on non-output"),
    (uprefix + r'.*\|\s*sed[^|>\n]*\n',
     "use regex test output patterns instead of sed"),
    (uprefix + r'(true|exit 0)', "explicit zero exit unnecessary"),
    (uprefix + r'.*(?<!\[)\$\?', "explicit exit code checks unnecessary"),
    (uprefix + r'.*\|\| echo.*(fail|error)',
     "explicit exit code checks unnecessary"),
    (uprefix + r'set -e', "don't use set -e"),
    (uprefix + r'\s', "don't indent commands, use > for continued lines"),
    (r'^  saved backup bundle to \$TESTTMP.*\.hg$',
     "use (glob) to match Windows paths too"),
  ],
  # warnings
  []
]

for i in [0, 1]:
    for p, m in testpats[i]:
        if p.startswith(r'^'):
            p = r"^  [$>] (%s)" % p[1:]
        else:
            p = r"^  [$>] .*(%s)" % p
        utestpats[i].append((p, m))

utestfilters = [
    (r"( *)(#([^\n]*\S)?)", repcomment),
]

pypats = [
  [
    (r'^\s*def\s*\w+\s*\(.*,\s*\(',
     "tuple parameter unpacking not available in Python 3+"),
    (r'lambda\s*\(.*,.*\)',
     "tuple parameter unpacking not available in Python 3+"),
    (r'(?<!def)\s+(cmp)\(', "cmp is not available in Python 3+"),
    (r'\breduce\s*\(.*', "reduce is not available in Python 3+"),
    (r'\.has_key\b', "dict.has_key is not available in Python 3+"),
    (r'^\s*\t', "don't use tabs"),
    (r'\S;\s*\n', "semicolon"),
    (r'[^_]_\("[^"]+"\s*%', "don't use % inside _()"),
    (r"[^_]_\('[^']+'\s*%", "don't use % inside _()"),
    (r'\w,\w', "missing whitespace after ,"),
    (r'\w[+/*\-<>]\w', "missing whitespace in expression"),
    (r'^\s+\w+=\w+[^,)\n]$', "missing whitespace in assignment"),
    (r'(\s+)try:\n((?:\n|\1\s.*\n)+?)\1except.*?:\n'
     r'((?:\n|\1\s.*\n)+?)\1finally:', 'no try/except/finally in Python 2.4'),
    (r'(\s+)try:\n((?:\n|\1\s.*\n)*?)\1\s*yield\b.*?'
     r'((?:\n|\1\s.*\n)+?)\1finally:',
     'no yield inside try/finally in Python 2.4'),
    (r'.{81}', "line too long"),
    (r' x+[xo][\'"]\n\s+[\'"]x', 'string join across lines with no space'),
    (r'[^\n]\Z', "no trailing newline"),
    (r'(\S[ \t]+|^[ \t]+)\n', "trailing whitespace"),
#    (r'^\s+[^_ \n][^_. \n]+_[^_\n]+\s*=',
#     "don't use underbars in identifiers"),
    (r'^\s+(self\.)?[A-za-z][a-z0-9]+[A-Z]\w* = ',
     "don't use camelcase in identifiers"),
    (r'^\s*(if|while|def|class|except|try)\s[^[\n]*:\s*[^\\n]#\s]+',
     "linebreak after :"),
    (r'class\s[^( \n]+:', "old-style class, use class foo(object)"),
    (r'class\s[^( \n]+\(\):',
     "class foo() not available in Python 2.4, use class foo(object)"),
    (r'\b(%s)\(' % '|'.join(keyword.kwlist),
     "Python keyword is not a function"),
    (r',]', "unneeded trailing ',' in list"),
#    (r'class\s[A-Z][^\(]*\((?!Exception)',
#     "don't capitalize non-exception classes"),
#    (r'in range\(', "use xrange"),
#    (r'^\s*print\s+', "avoid using print in core and extensions"),
    (r'[\x80-\xff]', "non-ASCII character literal"),
    (r'("\')\.format\(', "str.format() not available in Python 2.4"),
    (r'^\s*with\s+', "with not available in Python 2.4"),
    (r'\.isdisjoint\(', "set.isdisjoint not available in Python 2.4"),
    (r'^\s*except.* as .*:', "except as not available in Python 2.4"),
    (r'^\s*os\.path\.relpath', "relpath not available in Python 2.4"),
    (r'(?<!def)\s+(any|all|format)\(',
     "any/all/format not available in Python 2.4"),
    (r'(?<!def)\s+(callable)\(',
     "callable not available in Python 3, use getattr(f, '__call__', None)"),
    (r'if\s.*\selse', "if ... else form not available in Python 2.4"),
    (r'^\s*(%s)\s\s' % '|'.join(keyword.kwlist),
     "gratuitous whitespace after Python keyword"),
    (r'([\(\[][ \t]\S)|(\S[ \t][\)\]])', "gratuitous whitespace in () or []"),
#    (r'\s\s=', "gratuitous whitespace before ="),
    (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=|%=)\S',
     "missing whitespace around operator"),
    (r'[^>< ](\+=|-=|!=|<>|<=|>=|<<=|>>=|%=)\s',
     "missing whitespace around operator"),
    (r'\s(\+=|-=|!=|<>|<=|>=|<<=|>>=|%=)\S',
     "missing whitespace around operator"),
    (r'[^^+=*/!<>&| %-](\s=|=\s)[^= ]',
     "wrong whitespace around ="),
    (r'raise Exception', "don't raise generic exceptions"),
    (r' is\s+(not\s+)?["\'0-9-]', "object comparison with literal"),
    (r' [=!]=\s+(True|False|None)',
     "comparison with singleton, use 'is' or 'is not' instead"),
    (r'^\s*(while|if) [01]:',
     "use True/False for constant Boolean expression"),
    (r'(?:(?<!def)\s+|\()hasattr',
     'hasattr(foo, bar) is broken, use util.safehasattr(foo, bar) instead'),
    (r'opener\([^)]*\).read\(',
     "use opener.read() instead"),
    (r'BaseException', 'not in Python 2.4, use Exception'),
    (r'os\.path\.relpath', 'os.path.relpath is not in Python 2.5'),
    (r'opener\([^)]*\).write\(',
     "use opener.write() instead"),
    (r'[\s\(](open|file)\([^)]*\)\.read\(',
     "use util.readfile() instead"),
    (r'[\s\(](open|file)\([^)]*\)\.write\(',
     "use util.readfile() instead"),
    (r'^[\s\(]*(open(er)?|file)\([^)]*\)',
     "always assign an opened file to a variable, and close it afterwards"),
    (r'[\s\(](open|file)\([^)]*\)\.',
     "always assign an opened file to a variable, and close it afterwards"),
    (r'(?i)descendent', "the proper spelling is descendAnt"),
    (r'\.debug\(\_', "don't mark debug messages for translation"),
    (r'\.strip\(\)\.split\(\)', "no need to strip before splitting"),
    (r'^\s*except\s*:', "warning: naked except clause", r'#.*re-raises'),
    (r':\n(    )*( ){1,3}[^ ]', "must indent 4 spaces"),
  ],
  # warnings
  [
    (r'ui\.(status|progress|write|note|warn)\([\'\"]x',
     "warning: unwrapped ui message"),
  ]
]

pyfilters = [
    (r"""(?msx)(?P<comment>\#.*?$)|
         ((?P<quote>('''|\"\"\"|(?<!')'(?!')|(?<!")"(?!")))
          (?P<text>(([^\\]|\\.)*?))
          (?P=quote))""", reppython),
]

cpats = [
  [
    (r'//', "don't use //-style comments"),
    (r'^  ', "don't use spaces to indent"),
    (r'\S\t', "don't use tabs except for indent"),
    (r'(\S[ \t]+|^[ \t]+)\n', "trailing whitespace"),
    (r'.{81}', "line too long"),
    (r'(while|if|do|for)\(', "use space after while/if/do/for"),
    (r'return\(', "return is not a function"),
    (r' ;', "no space before ;"),
    (r'\w+\* \w+', "use int *foo, not int* foo"),
    (r'\([^\)]+\) \w+', "use (int)foo, not (int) foo"),
    (r'\w+ (\+\+|--)', "use foo++, not foo ++"),
    (r'\w,\w', "missing whitespace after ,"),
    (r'^[^#]\w[+/*]\w', "missing whitespace in expression"),
    (r'^#\s+\w', "use #foo, not # foo"),
    (r'[^\n]\Z', "no trailing newline"),
    (r'^\s*#import\b', "use only #include in standard C code"),
  ],
  # warnings
  []
]

cfilters = [
    (r'(/\*)(((\*(?!/))|[^*])*)\*/', repccomment),
    (r'''(?P<quote>(?<!")")(?P<text>([^"]|\\")+)"(?!")''', repquote),
    (r'''(#\s*include\s+<)([^>]+)>''', repinclude),
    (r'(\()([^)]+\))', repcallspaces),
]

inutilpats = [
  [
    (r'\bui\.', "don't use ui in util"),
  ],
  # warnings
  []
]

inrevlogpats = [
  [
    (r'\brepo\.', "don't use repo in revlog"),
  ],
  # warnings
  []
]

checks = [
    ('python', r'.*\.(py|cgi)$', pyfilters, pypats),
    ('test script', r'(.*/)?test-[^.~]*$', testfilters, testpats),
    ('c', r'.*\.c$', cfilters, cpats),
    ('unified test', r'.*\.t$', utestfilters, utestpats),
    ('layering violation repo in revlog', r'mercurial/revlog\.py', pyfilters,
     inrevlogpats),
    ('layering violation ui in util', r'mercurial/util\.py', pyfilters,
     inutilpats),
]

class norepeatlogger(object):
    def __init__(self):
        self._lastseen = None

    def log(self, fname, lineno, line, msg, blame):
        """print error related a to given line of a given file.

        The faulty line will also be printed but only once in the case
        of multiple errors.

        :fname: filename
        :lineno: line number
        :line: actual content of the line
        :msg: error message
        """
        msgid = fname, lineno, line
        if msgid != self._lastseen:
            if blame:
                print "%s:%d (%s):" % (fname, lineno, blame)
            else:
                print "%s:%d:" % (fname, lineno)
            print " > %s" % line
            self._lastseen = msgid
        print " " + msg

_defaultlogger = norepeatlogger()

def getblame(f):
    lines = []
    for l in os.popen('hg annotate -un %s' % f):
        start, line = l.split(':', 1)
        user, rev = start.split()
        lines.append((line[1:-1], user, rev))
    return lines

def checkfile(f, logfunc=_defaultlogger.log, maxerr=None, warnings=False,
              blame=False, debug=False, lineno=True):
    """checks style and portability of a given file

    :f: filepath
    :logfunc: function used to report error
              logfunc(filename, linenumber, linecontent, errormessage)
    :maxerr: number of error to display before aborting.
             Set to false (default) to report all errors

    return True if no error is found, False otherwise.
    """
    blamecache = None
    result = True
    for name, match, filters, pats in checks:
        if debug:
            print name, f
        fc = 0
        if not re.match(match, f):
            if debug:
                print "Skipping %s for %s it doesn't match %s" % (
                       name, match, f)
            continue
        fp = open(f)
        pre = post = fp.read()
        fp.close()
        if "no-" + "check-code" in pre:
            if debug:
                print "Skipping %s for %s it has no- and check-code" % (
                       name, f)
            break
        for p, r in filters:
            post = re.sub(p, r, post)
        if warnings:
            pats = pats[0] + pats[1]
        else:
            pats = pats[0]
        # print post # uncomment to show filtered version

        if debug:
            print "Checking %s for %s" % (name, f)

        prelines = None
        errors = []
        for pat in pats:
            if len(pat) == 3:
                p, msg, ignore = pat
            else:
                p, msg = pat
                ignore = None

            # fix-up regexes for multi-line searches
            po = p
            # \s doesn't match \n
            p = re.sub(r'(?<!\\)\\s', r'[ \\t]', p)
            # [^...] doesn't match newline
            p = re.sub(r'(?<!\\)\[\^', r'[^\\n', p)

            #print po, '=>', p

            pos = 0
            n = 0
            for m in re.finditer(p, post, re.MULTILINE):
                if prelines is None:
                    prelines = pre.splitlines()
                    postlines = post.splitlines(True)

                start = m.start()
                while n < len(postlines):
                    step = len(postlines[n])
                    if pos + step > start:
                        break
                    pos += step
                    n += 1
                l = prelines[n]

                if "check-code" + "-ignore" in l:
                    if debug:
                        print "Skipping %s for %s:%s (check-code -ignore)" % (
                            name, f, n)
                    continue
                elif ignore and re.search(ignore, l, re.MULTILINE):
                    continue
                bd = ""
                if blame:
                    bd = 'working directory'
                    if not blamecache:
                        blamecache = getblame(f)
                    if n < len(blamecache):
                        bl, bu, br = blamecache[n]
                        if bl == l:
                            bd = '%s@%s' % (bu, br)
                errors.append((f, lineno and n + 1, l, msg, bd))
                result = False

        errors.sort()
        for e in errors:
            logfunc(*e)
            fc += 1
            if maxerr and fc >= maxerr:
                print " (too many errors, giving up)"
                break

    return result

if __name__ == "__main__":
    parser = optparse.OptionParser("%prog [options] [files]")
    parser.add_option("-w", "--warnings", action="store_true",
                      help="include warning-level checks")
    parser.add_option("-p", "--per-file", type="int",
                      help="max warnings per file")
    parser.add_option("-b", "--blame", action="store_true",
                      help="use annotate to generate blame info")
    parser.add_option("", "--debug", action="store_true",
                      help="show debug information")
    parser.add_option("", "--nolineno", action="store_false",
                      dest='lineno', help="don't show line numbers")

    parser.set_defaults(per_file=15, warnings=False, blame=False, debug=False,
                        lineno=True)
    (options, args) = parser.parse_args()

    if len(args) == 0:
        check = glob.glob("*")
    else:
        check = args

    ret = 0
    for f in check:
        if not checkfile(f, maxerr=options.per_file, warnings=options.warnings,
                         blame=options.blame, debug=options.debug,
                         lineno=options.lineno):
            ret = 1
    sys.exit(ret)