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 # Prefer gawk if available, as it handles NUL bytes properly.
  24 if type gawk >/dev/null 2>&1; then
  25   awk=gawk
  26 else
  27   awk=awk
  28 fi
  29
  30 # Use a UTF-8 locale if available, so that the UTF-8 check works.
  31 # Use U+00A2 CENT SIGN to test whether the locale works.
  32 cent_sign_utf8_octal='\302\242'
  33 at_sign=`
  34   printf "${cent_sign_utf8_octal}@" |
  35   $awk '{print substr($0, 2)}' 2>/dev/null
  36 `
  37 if test "$at_sign" != @; then
  38   at_sign=`
  39     printf "${cent_sign_utf8_octal}@" |
  40     LC_ALL=en_US.UTF-8 $awk '{print substr($0, 2)}' 2>/dev/null
  41   `
  42   if test "$at_sign" = @; then
  43     LC_ALL=en_US.UTF-8; export LC_ALL
  44   fi
  45 fi
  46
  47 # Check the log entry.
  48 exec $awk '
  49   /^#/ { next }
  50
  51   !/^.*$/ {
  52     print "Invalid character (not UTF-8)"
  53     status = 1
  54   }
  55
  56   nlines == 0 && !/[^[:space:]]/ { next }
  57
  58   { nlines++ }
  59
  60   nlines == 1 && /^[[:space:]]/ {
  61     print "White space at start of first line"
  62     status = 1
  63   }
  64
  65   nlines == 2 && /[^[:space:]]/ {
  66     print "Nonempty second line"
  67     status = 1
  68   }
  69
  70   /[^[:print:]]/ {
  71     print "Unprintable character; please use spaces instead of tabs"
  72     status = 1
  73   }
  74
  75   72 < length && /[[:space:]]/ {
  76     print "Line longer than 72 characters"
  77     status = 1
  78   }
  79
  80   140 < length {
  81     print "Word longer than 140 characters"
  82     status = 1
  83   }
  84
  85   /^Signed-off-by: / {
  86     print "'\''Signed-off-by:'\'' present"
  87     status = 1
  88   }
  89
  90   END {
  91     if (nlines == 0) {
  92       print "Empty change log entry"
  93       status = 1
  94     }
  95     exit status
  96   }
  97 ' <"$1"