contrib/check-code.py

py3: replace pycompat.getenv with encoding.environ.get

pycompat.getenv returns os.getenvb on py3 which is not available on Windows.
This patch replaces them with encoding.environ.get and checks to ensure no
new instances of os.getenv or os.setenv are introduced.

#!/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)
 * 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
"""

from __future__ import absolute_import, print_function
import glob
import keyword
import optparse
import os
import re
import sys
if sys.version_info[0] < 3:
    opentext = open
else:
    def opentext(f):
        return open(f, encoding='ascii')
try:
    xrange
except NameError:
    xrange = range
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)

# check "rules depending on implementation of repquote()" in each
# patterns (especially pypats), before changing around repquote()
_repquotefixedmap = {' ': ' ', '\n': '\n', '.': 'p', ':': 'q',
                     '%': '%', '\\': 'b', '*': 'A', '+': 'P', '-': 'M'}
def _repquoteencodechr(i):
    if i > 255:
        return 'u'
    c = chr(i)
    if c in _repquotefixedmap:
        return _repquotefixedmap[c]
    if c.isalpha():
        return 'x'
    if c.isdigit():
        return 'n'
    return 'o'
_repquotett = ''.join(_repquoteencodechr(i) for i in xrange(256))

def repquote(m):
    t = m.group('text')
    t = t.translate(_repquotett)
    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 $(()), use 'expr'"),
    (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),
    (r'(?<!hg )grep.* -a', "don't use 'grep -a', use in-line python"),
    (r'sed.*-i', "don't use 'sed -i', use a temporary file"),
    (r'\becho\b.*\\n', "don't use 'echo \\n', use printf"),
    (r'echo -n', "don't use 'echo -n', use printf"),
    (r'(^|\|\s*)\bwc\b[^|]*$\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)', r"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'\bls +[^|\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'\[\[\s+[^\]]*\]\]', "don't use '[[ ]]', use '[ ]'"),
    (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*[uU].*$\n(^  \$ |^$)', "prefix diff -u/-U with cmp"),
    (r'^\s+(if)? diff *-\w*[uU]', "prefix diff -u/-U with cmp"),
    (r'seq ', "don't use 'seq', use $TESTDIR/seq.py"),
    (r'\butil\.Abort\b', "directly use error.Abort"),
    (r'\|&', "don't use |&, use 2>&1"),
    (r'\w =  +\w', "only one space after = allowed"),
    (r'\bsed\b.*[^\\]\\n', "don't use 'sed ... \\n', use a \\ and a newline"),
    (r'env.*-u', "don't use 'env -u VAR', use 'unset VAR'"),
    (r'cp.* -r ', "don't use 'cp -r', use 'cp -R'"),
  ],
  # 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.*||  [$>] \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
     '# no-msys'), # 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 (?!subrepo ).*/.*[^)]$', winglobmsg),
    (r'^  cloning subrepo \S+/.*[^)]$', 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'),
    (r'^  [^$>].*27\.0\.0\.1.*[^)]$',
     'use (glob) to match localhost IP on hosts without 127.0.0.1 too'),
    (r'^  (cat|find): .*: No such file or directory',
     'use test -f to test for file existence'),
    (r'^  diff -[^ -]*p',
     "don't use (external) diff with -p for portability"),
    (r'^  [-+][-+][-+] .* [-+]0000 \(glob\)',
     "glob timezone field in diff output for portability"),
    (r'^  @@ -[0-9]+ [+][0-9]+,[0-9]+ @@',
     "use '@@ -N* +N,n @@ (glob)' style chunk header for portability"),
    (r'^  @@ -[0-9]+,[0-9]+ [+][0-9]+ @@',
     "use '@@ -N,n +N* @@ (glob)' style chunk header for portability"),
    (r'^  @@ -[0-9]+ [+][0-9]+ @@',
     "use '@@ -N* +N* @@ (glob)' style chunk header for portability"),
    (uprefix + r'hg( +-[^ ]+( +[^ ]+)?)* +extdiff'
     r'( +(-[^ po-]+|--(?!program|option)[^ ]+|[^-][^ ]*))*$',
     "use $RUNTESTDIR/pdiff via extdiff (or -o/-p for false-positives)"),
  ],
  # warnings
  [
    (r'^  (?!.*127\.0\.0\.1)[^*?/\n]* \(glob\)$',
     "glob match with no glob string (?, *, /, and 127.0.0.1)"),
  ]
]

for i in [0, 1]:
    for tp in testpats[i]:
        p = tp[0]
        m = tp[1]
        if p.startswith(r'^'):
            p = r"^  [$>] (%s)" % p[1:]
        else:
            p = r"^  [$>] .*(%s)" % p
        utestpats[i].append((p, m) + tp[2:])

utestfilters = [
    (r"<<(\S+)((.|\n)*?\n  > \1)", rephere),
    (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'\bdict\(.*=', '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'\w\s=\s\s+\w', "gratuitous whitespace after ="),
    (r'.{81}', "line too long"),
    (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'#.*old-style'),
    (r'class\s[^( \n]+\(\):',
     "class foo() creates old style object, use class foo(object)",
     r'#.*old-style'),
    (r'\b(%s)\(' % '|'.join(k for k in keyword.kwlist
                            if k not in ('print', 'exec')),
     "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() has no bytes counterpart, use %"),
    (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'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)descend[e]nt', "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'^\s*except\s([^\(,]+|\([^\)]+\))\s*,',
     'legacy exception syntax; use "as" instead of ","'),
    (r':\n(    )*( ){1,3}[^ ]', "must indent 4 spaces"),
    (r'release\(.*wlock, .*lock\)', "wrong lock release order"),
    (r'\b__bool__\b', "__bool__ should be __nonzero__ in Python 2"),
    (r'os\.path\.join\(.*, *(""|\'\')\)',
     "use pathutil.normasprefix(path) instead of os.path.join(path, '')"),
    (r'\s0[0-7]+\b', 'legacy octal syntax; use "0o" prefix instead of "0"'),
    # XXX only catch mutable arguments on the first line of the definition
    (r'def.*[( ]\w+=\{\}', "don't use mutable default arguments"),
    (r'\butil\.Abort\b', "directly use error.Abort"),
    (r'^@(\w*\.)?cachefunc', "module-level @cachefunc is risky, please avoid"),
    (r'^import Queue', "don't use Queue, use util.queue + util.empty"),
    (r'^import cStringIO', "don't use cStringIO.StringIO, use util.stringio"),
    (r'^import urllib', "don't use urllib, use util.urlreq/util.urlerr"),
    (r'^import SocketServer', "don't use SockerServer, use util.socketserver"),
    (r'^import urlparse', "don't use urlparse, use util.urlparse"),
    (r'^import xmlrpclib', "don't use xmlrpclib, use util.xmlrpclib"),
    (r'^import cPickle', "don't use cPickle, use util.pickle"),
    (r'^import pickle', "don't use pickle, use util.pickle"),
    (r'^import httplib', "don't use httplib, use util.httplib"),
    (r'^import BaseHTTPServer', "use util.httpserver instead"),
    (r'\.next\(\)', "don't use .next(), use next(...)"),

    # rules depending on implementation of repquote()
    (r' x+[xpqo%APM][\'"]\n\s+[\'"]x',
     'string join across lines with no space'),
    (r'''(?x)ui\.(status|progress|write|note|warn)\(
         [ \t\n#]*
         (?# any strings/comments might precede a string, which
           # contains translatable message)
         ((['"]|\'\'\'|""")[ \npq%bAPMxno]*(['"]|\'\'\'|""")[ \t\n#]+)*
         (?# sequence consisting of below might precede translatable message
           # - formatting string: "% 10s", "%05d", "% -3.2f", "%*s", "%%" ...
           # - escaped character: "\\", "\n", "\0" ...
           # - character other than '%', 'b' as '\', and 'x' as alphabet)
         (['"]|\'\'\'|""")
         ((%([ n]?[PM]?([np]+|A))?x)|%%|b[bnx]|[ \nnpqAPMo])*x
         (?# this regexp can't use [^...] style,
           # because _preparepats forcibly adds "\n" into [^...],
           # even though this regexp wants match it against "\n")''',
     "missing _() in ui message (use () to hide false-positives)"),
  ],
  # warnings
  [
    # rules depending on implementation of repquote()
    (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\(', "return is not a function"),
    (r' ;', "no space before ;"),
    (r'[^;] \)', "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'\w\s=\s\s+\w', "gratuitous whitespace after ="),
    (r'^#\s+\w', "use #foo, not # foo"),
    (r'[^\n]\Z', "no trailing newline"),
    (r'^\s*#import\b', "use only #include in standard C code"),
    (r'strcpy\(', "don't use strcpy, use strlcpy or memcpy"),
    (r'strcat\(', "don't use strcat"),

    # rules depending on implementation of repquote()
  ],
  # warnings
  [
    # rules depending on implementation of repquote()
  ]
]

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
  []
]

webtemplatefilters = []

webtemplatepats = [
  [],
  [
    (r'{desc(\|(?!websub|firstline)[^\|]*)+}',
     'follow desc keyword with either firstline or websub'),
  ]
]

allfilesfilters = []

allfilespats = [
  [
    (r'(http|https)://[a-zA-Z0-9./]*selenic.com/',
     'use mercurial-scm.org domain URL'),
  ],
  # warnings
  [],
]

py3pats = [
  [
    (r'os\.environ', "use encoding.environ instead (py3)"),
    (r'os\.name', "use pycompat.osname instead (py3)"),
    (r'os\.getcwd', "use pycompat.getcwd instead (py3)"),
    (r'os\.sep', "use pycompat.ossep instead (py3)"),
    (r'os\.pathsep', "use pycompat.ospathsep instead (py3)"),
    (r'os\.altsep', "use pycompat.osaltsep instead (py3)"),
    (r'sys\.platform', "use pycompat.sysplatform instead (py3)"),
    (r'getopt\.getopt', "use pycompat.getoptb instead (py3)"),
    (r'os\.getenv', "use encoding.environ.get instead"),
    (r'os\.setenv', "modifying the environ dict is not preferred"),
  ],
  # warnings
  [],
]

checks = [
    ('python', r'.*\.(py|cgi)$', r'^#!.*python', pyfilters, pypats),
    ('python 3', r'.*(hgext|mercurial).*(?<!pycompat)\.py', '',
            pyfilters, py3pats),
    ('test script', r'(.*/)?test-[^.~]*$', '', 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$', '', txtfilters, txtpats),
    ('web template', r'mercurial/templates/.*\.tmpl', '',
     webtemplatefilters, webtemplatepats),
    ('all except for .po', r'.*(?<!\.po)$', '',
     allfilesfilters, allfilespats),
]

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[3]
        for i, flt in enumerate(filters):
            filters[i] = re.compile(flt[0]), flt[1]

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

    try:
        with opentext(f) as fp:
            try:
                pre = post = fp.read()
            except UnicodeDecodeError as e:
                print("%s while reading %s" % (e, f))
                return result
    except IOError as e:
        print("Skipping %s, %s" % (f, str(e).split(':', 1)[0]))
        return result

    for name, match, magic, filters, pats in checks:
        post = pre # discard filtering result of previous check
        if debug:
            print(name, f)
        fc = 0
        if not (re.match(match, f) or (magic and re.search(magic, pre))):
            if debug:
                print("Skipping %s for %s it doesn't match %s" % (
                       name, match, f))
            continue
        if "no-" "check-code" in pre:
            # If you're looking at this line, it's because a file has:
            # no- check- code
            # but the reason to output skipping is to make life for
            # tests easier. So, instead of writing it with a normal
            # spelling, we write it with the expected spelling from
            # tests/test-check-code.t
            print("Skipping %s it has no-che?k-code (glob)" % 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

def 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

    _preparepats()

    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
    return ret

if __name__ == "__main__":
    sys.exit(main())