build-aux/git-hooks/commit-msg

   1 #!/bin/sh
   2 # Check the format of GNU Emacs change log entries.
   3
   4 # Copyright 2014 Free Software Foundation, Inc.
   5
   6 # This file is part of GNU Emacs.
   7
   8 # GNU Emacs is free software: you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation, either version 3 of the License, or
  11 # (at your option) any later version.
  12
  13 # GNU Emacs is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17
  18 # You should have received a copy of the GNU General Public License
  19 # along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 # Written by Paul Eggert.
  22
  23 # Use a UTF-8 locale if available, so that the UTF-8 check works.
  24 # Use U+00A2 CENT SIGN to test whether the locale works.
  25 cent_sign_utf8_octal='\302\242'
  26 at_sign=`
  27   printf "${cent_sign_utf8_octal}@" |
  28   awk '{print substr($0, 2)}' 2>/dev/null
  29 `
  30 if test "$at_sign" != @; then
  31   at_sign=`
  32     printf "${cent_sign_utf8_octal}@" |
  33     LC_ALL=en_US.utf8 awk '{print substr($0, 2)}' 2>/dev/null
  34   `
  35   if test "$at_sign" = @; then
  36     LC_ALL=en_US.utf8; export LC_ALL
  37   fi
  38 fi
  39
  40 # Check the log entry.
  41 exec awk '
  42   /^#/ { next }
  43
  44   !/^.*$/ {
  45     print "Invalid character (not UTF-8)"
  46     status = 1
  47   }
  48
  49   nlines == 0 && !/[^[:space:]]/ { next }
  50
  51   { nlines++ }
  52
  53   nlines == 1 && /^[[:space:]]/ {
  54     print "White space at start of first line"
  55     status = 1
  56   }
  57
  58   nlines == 2 && /[^[:space:]]/ {
  59     print "Nonempty second line"
  60     status = 1
  61   }
  62
  63   /[[:cntrl:]]/ {
  64     print "Text contains control character; please use spaces instead of tabs"
  65     status = 1
  66   }
  67
  68   72 < length && /[[:space:]]/ {
  69     print "Line longer than 72 characters"
  70     status = 1
  71   }
  72
  73   140 < length {
  74     print "Word longer than 140 characters"
  75     status = 1
  76   }
  77
  78   /^Signed-off-by: / {
  79     print "'Signed-off-by:' present"
  80     status = 1
  81   }
  82
  83   END {
  84     if (nlines == 0) {
  85       print "Empty change log entry"
  86       status = 1
  87     }
  88     exit status
  89   }
  90 ' <"$1"