contrib/check-code.py

merge: with merge.preferancestor=*, run an auction with bids from ancestors

The basic idea is to do the merge planning with all the available ancestors,
consider the resulting actions as "bids", make an "auction" and
automatically pick the most favourable action for each file.

This implements the basic functionality and will only consider "keep" and
"get" actions. The heuristics for picking the best action can be tweaked later
on.

By default it will only pass ctx.ancestor as the single ancestor to
calculateupdates. The code path for merging with a single ancestor is not
changed.

#!/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.

"""style and portability checker for Mercurial

when a rule triggers wrong, do one of the following (prefer one from top):
 * do the work-around the rule suggests
 * doublecheck that it is a false match
 * improve the rule pattern
 * add an ignore pattern to the rule (3rd arg) which matches your good line
   (you can append a short comment and match this, like: #re-raises, # no-py24)
 * change the pattern to a warning and list the exception in test-check-code-hg
 * ONLY use no--check-code for skipping entire files from external sources
"""

import re, glob, os, sys
import keyword
import optparse
try:
    import re2
except ImportError:
    re2 = None

def compilere(pat, multiline=False):
    if multiline:
        pat = '(?m)' + pat
    if re2:
        try:
            return re2.compile(pat)
        except re2.error:
            pass
    return re.compile(pat)

def repquote(m):
    fromc = '.:'
    tochr = 'pq'
    def encodechr(i):
        if i > 255:
            return 'u'
        c = chr(i)
        if c in ' \n':
            return c
        if c.isalpha():
            return 'x'
        if c.isdigit():
            return 'n'
        try:
            return tochr[fromc.find(c)]
        except (ValueError, IndexError):
            return 'o'
    t = m.group('text')
    tt = ''.join(encodechr(i) for i in xrange(256))
    t = t.translate(tt)
    return m.group('quote') + t + m.group('quote')

def reppython(m):
    comment = m.group('comment')
    if comment:
        l = len(comment.rstrip())
        return "#" * l + comment[l:]
    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 $(()), use 'expr'"),
    (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),
    (r'(?<!hg )grep.*-a', "don't use 'grep -a', use in-line python"),
    (r'sed.*-i', "don't use 'sed -i', use a temporary file"),
    (r'\becho\b.*\\n', "don't use 'echo \\n', use printf"),
    (r'echo -n', "don't use 'echo -n', use printf"),
    (r'(^| )wc[^|]*$\n(?!.*\(re\))', "filter wc output"),
    (r'head -c', "don't use 'head -c', use 'dd'"),
    (r'tail -n', "don't use the '-n' option to tail, just use '-<num>'"),
    (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"),
    (r'sed (-e )?\'(\d+|/[^/]*/)i(?!\\\n)',
     "put a backslash-escaped newline after sed 'i' command"),
    (r'^diff *-\w*u.*$\n(^  \$ |^$)', "prefix diff -u with cmp"),
  ],
  # warnings
  [
    (r'^function', "don't use 'function', use old style"),
    (r'^diff.*-\w*N', "don't use 'diff -N'"),
    (r'\$PWD|\${PWD}', "don't use $PWD, use `pwd`"),
    (r'^([^"\'\n]|("[^"\n]*")|(\'[^\'\n]*\'))*\^', "^ must be quoted"),
    (r'kill (`|\$\()', "don't use kill, use killdaemons.py")
  ]
]

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

winglobmsg = "use (glob) to match Windows paths too"
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|fi\b|done\b)', "use > for continued lines"),
    (uprefix + r'.*:\.\S*/', "x:.y in a path does not work on msys, rewrite "
     "as x://.y, or see `hg log -k msys` for alternatives", r'-\S+:\.|' #-Rxxx
     'hg pull -q file:../test'), # in test-pull.t which is skipped on windows
    (r'^  saved backup bundle to \$TESTTMP.*\.hg$', winglobmsg),
    (r'^  changeset .* references (corrupted|missing) \$TESTTMP/.*[^)]$',
     winglobmsg),
    (r'^  pulling from \$TESTTMP/.*[^)]$', winglobmsg,
     '\$TESTTMP/unix-repo$'), # in test-issue1802.t which skipped on windows
    (r'^  reverting .*/.*[^)]$', winglobmsg),
    (r'^  cloning subrepo \S+/.*[^)]$', winglobmsg),
    (r'^  pushing to \$TESTTMP/.*[^)]$', winglobmsg),
    (r'^  pushing subrepo \S+/\S+ to.*[^)]$', winglobmsg),
    (r'^  moving \S+/.*[^)]$', winglobmsg),
    (r'^  no changes made to subrepo since.*/.*[^)]$', winglobmsg),
    (r'^  .*: largefile \S+ not available from file:.*/.*[^)]$', winglobmsg),
    (r'^  .*file://\$TESTTMP',
     'write "file:/*/$TESTTMP" + (glob) to match on windows too'),
  ],
  # warnings
  [
    (r'^  [^*?/\n]* \(glob\)$',
     "glob match with no glob character (?*/)"),
  ]
]

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

pypats = [
  [
    (r'\([^)]*\*\w[^()]+\w+=', "can't pass varargs with keyword in Py2.5"),
    (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'import (.+,[^.]+\.[^.]+|[^.]+\.[^.]+,)',
     '2to3 can\'t always rewrite "import qux, foo.bar", '
     'use "import foo.bar" on its own line instead.'),
    (r'(?<!def)\s+(cmp)\(', "cmp is not available in Python 3+"),
    (r'\breduce\s*\(.*', "reduce is not available in Python 3+"),
    (r'dict\(.*=', 'dict() is different in Py2 and 3 and is slower than {}',
     'dict-from-generator'),
    (r'\.has_key\b', "dict.has_key is not available in Python 3+"),
    (r'\s<>\s', '<> operator is not available in Python 3+, use !='),
    (r'^\s*\t', "don't use tabs"),
    (r'\S;\s*\n', "semicolon"),
    (r'[^_]_\([ \t\n]*(?:"[^"]+"[ \t\n+]*)+%', "don't use % inside _()"),
    (r"[^_]_\([ \t\n]*(?:'[^']+'[ \t\n+]*)+%", "don't use % inside _()"),
    (r'(\w|\)),\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'(?<!def)(\s+|^|\()next\(.+\)',
     'no next(foo) in Python 2.4 and 2.5, use foo.next() instead'),
    (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", 'no-py24'),
    (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'\([^()]*( =[^=]|[^<>!=]= )',
     "no whitespace around = for named parameters"),
    (r'raise Exception', "don't raise generic exceptions"),
    (r'raise [^,(]+, (\([^\)]+\)|[^,\(\)]+)$',
     "don't use old-style two-argument raise, use Exception(message)"),
    (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.writefile() 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*:', "naked except clause", r'#.*re-raises'),
    (r':\n(    )*( ){1,3}[^ ]', "must indent 4 spaces"),
    (r'ui\.(status|progress|write|note|warn)\([\'\"]x',
     "missing _() in ui message (use () to hide false-positives)"),
    (r'release\(.*wlock, .*lock\)', "wrong lock release order"),
  ],
  # warnings
  [
    (r'(^| )pp +xxxxqq[ \n][^\n]', "add two newlines after '.. note::'"),
  ]
]

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

txtfilters = []

txtpats = [
  [
    ('\s$', 'trailing whitespace'),
    ('.. note::[ \n][^\n]', 'add two newlines after note::')
  ],
  []
]

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'[)][{]', "space between ) and {"),
    (r'\w+\* \w+', "use int *foo, not int* foo"),
    (r'\W\([^\)]+\) \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'.*\.[ch]$', cfilters, cpats),
    ('unified test', r'.*\.t$', utestfilters, utestpats),
    ('layering violation repo in revlog', r'mercurial/revlog\.py', pyfilters,
     inrevlogpats),
    ('layering violation ui in util', r'mercurial/util\.py', pyfilters,
     inutilpats),
    ('txt', r'.*\.txt$', txtfilters, txtpats),
]

def _preparepats():
    for c in checks:
        failandwarn = c[-1]
        for pats in failandwarn:
            for i, pseq in enumerate(pats):
                # fix-up regexes for multi-line searches
                p = pseq[0]
                # \s doesn't match \n
                p = re.sub(r'(?<!\\)\\s', r'[ \\t]', p)
                # [^...] doesn't match newline
                p = re.sub(r'(?<!\\)\[\^', r'[^\\n', p)

                pats[i] = (re.compile(p, re.MULTILINE),) + pseq[1:]
        filters = c[2]
        for i, flt in enumerate(filters):
            filters[i] = re.compile(flt[0]), flt[1]
_preparepats()

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
        try:
            fp = open(f)
        except IOError, e:
            print "Skipping %s, %s" % (f, str(e).split(':', 1)[0])
            continue
        pre = post = fp.read()
        fp.close()
        if "no-" "check-code" in pre:
            print "Skipping %s it has no-" "check-code" % f
            return "Skip" # skip checking this file
        for p, r in filters:
            post = re.sub(p, r, post)
        nerrs = len(pats[0]) # nerr elements are errors
        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 i, pat in enumerate(pats):
            if len(pat) == 3:
                p, msg, ignore = pat
            else:
                p, msg = pat
                ignore = None
            if i >= nerrs:
                msg = "warning: " + msg

            pos = 0
            n = 0
            for m in p.finditer(post):
                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 ignore and re.search(ignore, l, re.MULTILINE):
                    if debug:
                        print "Skipping %s for %s:%s (ignore pattern)" % (
                            name, f, n)
                    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)