#!/usr/bin/env python

#

# check-code - a style and portability checker for Mercurial

#

# Copyright 2010 Matt Mackall <mpm@selenic.com>

#

# 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

import optparse

def repquote(m):

    t = re.sub(r"\w", "x", m.group('text'))

    t = re.sub(r"[^\sx]", "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\$?\(\([^\)]*\)\)', "don't use (()) or $(()), use 'expr'"),

    (r'^function', "don't use 'function', use old style"),

    (r'grep.*-q', "don't use 'grep -q', redirect to /dev/null"),

    (r'echo.*\\n', "don't use 'echo \\n', use printf"),

    (r'^diff.*-\w*N', "don't use 'diff -N'"),

    (r'(^| )wc[^|]*$', "filter wc output"),

    (r'head -c', "don't use 'head -c', use 'dd'"),

    (r'ls.*-\w*R', "don't use 'ls -R', use 'find'"),

    (r'printf.*\\\d\d\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'\$PWD', "don't use $PWD, use `pwd`"),

    (r'[^\n]\Z', "no trailing newline"),

    (r'export.*=', "don't export and assign at once"),

    ('^([^"\']|("[^"]*")|(\'[^\']*\'))*\\^', "^ must be quoted"),

    (r'^source\b', "don't use 'source', use '.'"),

]

testfilters = [

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

    (r"<<(\S+)((.|\n)*?\n\1)", rephere),

]

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'\breduce\s*\(.*', "reduce is not available in Python 3+"),

    (r'^\s*\t', "don't use tabs"),

    (r'\S;\s*\n', "semicolon"),

    (r'\w,\w', "missing whitespace after ,"),

    (r'\w[+/*\-<>]\w', "missing whitespace in expression"),

    (r'^\s+\w+=\w+[^,)]$', "missing whitespace in assignment"),

    (r'.{85}', "line too long"),

    (r'[^\n]\Z', "no trailing newline"),

#    (r'^\s+[^_ ][^_. ]+_[^_]+\s*=', "don't use underbars in identifiers"),

#    (r'\w*[a-z][A-Z]\w*\s*=', "don't use camelcase in identifiers"),

    (r'^\s*(if|while|def|class|except|try)\s[^[]*:\s*[^\]#\s]+',

     "linebreak after :"),

    (r'class\s[^(]:', "old-style class, use class foo(object)"),

    (r'^\s+del\(', "del isn't a function"),

    (r'^\s+except\(', "except isn't 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'(?<!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 hasattr(f, '__call__')"),

    (r'if\s.*\selse', "if ... else form not available in Python 2.4"),

    (r'([\(\[]\s\S)|(\S\s[\)\]])', "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'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\s+|^\s+)\n', "trailing whitespace"),

    (r'.{85}', "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'\S+ (\+\+|--)', "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"),

]

cfilters = [

    (r'(/\*)(((\*(?!/))|[^*])*)\*/', repccomment),

    (r'''(?P<quote>(?<!")")(?P<text>([^"]|\\")+)"(?!")''', repquote),

    (r'''(#\s*include\s+<)([^>]+)>''', repinclude),

    (r'(\()([^)]+\))', repcallspaces),

]

checks = [

    ('python', r'.*\.(py|cgi)$', pyfilters, pypats),

    ('test script', r'(.*/)?test-[^.~]*$', testfilters, testpats),

    ('c', r'.*\.c$', cfilters, cpats),

]

class norepeatlogger(object):

    def __init__(self):

        self._lastseen = None

    def log(self, fname, lineno, line, msg):

        """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:

            print "%s:%d:" % (fname, lineno)

            print " > %s" % line

            self._lastseen = msgid

        print " " + msg

_defaultlogger = norepeatlogger()

def checkfile(f, logfunc=_defaultlogger.log, maxerr=None, warnings=False):

    """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 arborting.

             Set to None (default) to report all errors

    return True if no error is found, False otherwise.

    """

    result = True

    for name, match, filters, pats in checks:

        fc = 0

        if not re.match(match, f):

            continue

        pre = post = open(f).read()

        if "no-" + "check-code" in pre:

            break

        for p, r in filters:

            post = re.sub(p, r, post)

        # print post # uncomment to show filtered version

        z = enumerate(zip(pre.splitlines(), post.splitlines(True)))

        for n, l in z:

            if "check-code" + "-ignore" in l[0]:

                continue

            for p, msg in pats:

                if not warnings and msg.startswith("warning"):

                    continue

                if re.search(p, l[1]):

                    logfunc(f, n + 1, l[0], msg)

                    fc += 1

                    result = False

            if maxerr is not None and fc >= maxerr:

                print " (too many errors, giving up)"

                break

        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.set_defaults(per_file=15, warnings=False)

    (options, args) = parser.parse_args()

    if len(args) == 0:

        check = glob.glob("*")

    else:

        check = args

    for f in check:

        checkfile(f, maxerr=options.per_file, warnings=options.warnings)