#!/usr/bin/env python

#

# Copyright 2014 Matt Mackall <mpm@selenic.com>

#

# A tool/hook to run basic sanity checks on commits/patches for

# submission to Mercurial. Install by adding the following to your

# .hg/hgrc:

#

# [hooks]

# pretxncommit = contrib/check-commit

#

# The hook can be temporarily bypassed with:

#

# $ BYPASS= hg commit

#

# See also: https://mercurial-scm.org/wiki/ContributingChanges

import re, sys, os

errors = [

    (r"[(]bc[)]", "(BC) needs to be uppercase"),

    (r"[(]issue \d\d\d", "no space allowed between issue and number"),

    (r"[(]bug(\d|\s)", "use (issueDDDD) instead of bug"),

    (r"^# User [^@\n]+$", "username is not an email address"),

    (r"^# .*\n(?!merge with )[^#]\S+[^:] ",

     "summary line doesn't start with 'topic: '"),

    (r"^# .*\n[A-Z][a-z]\S+", "don't capitalize summary lines"),

    (r"^# .*\n[^\n]*: *[A-Z][a-z]\S+", "don't capitalize summary lines"),

    (r"^# [^\n]*\n\S*[^A-Za-z0-9-]\S*: ",

     "summary keyword should be most user-relevant one-word command or topic"),

    (r"^# .*\n.*\.\s+$", "don't add trailing period on summary line"),

    (r"^\+\n \n", "adds double empty line"),

    (r"^ \n\+\n", "adds double empty line"),

    (r"^\+[ \t]+def [a-z]+_[a-z]", "adds a function with foo_bar naming"),

]

node = os.environ.get("HG_NODE")

if node:

    commit = os.popen("hg export %s" % node).read()

else:

    commit = sys.stdin.read()

exitcode = 0

for exp, msg in errors:

    m = re.search(exp, commit, re.MULTILINE)

    if m:

        pos = 0

        for n, l in enumerate(commit.splitlines(True)):

            pos += len(l)

            if pos >= m.end():

                print "%d: %s" % (n, msg)

                print " %s" % l[:-1]

                if "BYPASS" not in os.environ:

                    exitcode = 1

                break

sys.exit(exitcode)