lib-src/vcdiff

   1 #! /bin/sh
   2
   3 # Enhanced sccs diff utility for use with vc mode.
   4 # This version is more compatible with rcsdiff(1).
   5
   6 # Copyright (C) 1992-1993, 1995, 1997, 2001-2012
   7 #   Free Software Foundation, Inc.
   8
   9 # Author: Paul Eggert
  10 # (according to authors.el)
  11
  12 # This file is part of GNU Emacs.
  13
  14 # GNU Emacs is free software: you can redistribute it and/or modify
  15 # it under the terms of the GNU General Public License as published by
  16 # the Free Software Foundation, either version 3 of the License, or
  17 # (at your option) any later version.
  18
  19 # GNU Emacs is distributed in the hope that it will be useful,
  20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 # GNU General Public License for more details.
  23
  24 # You should have received a copy of the GNU General Public License
  25 # along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  26
  27
  28 DIFF="diff"
  29 usage="$0: Usage: vcdiff [--brief] [-q] [-r<sid1>] [-r<sid2>] [diffopts] sccsfile..."
  30
  31 # Now that we use `sccs get' rather than just `get', we don't need this.
  32 # PATH=$PATH:/usr/ccs/bin:/usr/sccs:/usr/xpg4/bin # common SCCS hangouts
  33
  34 echo="echo"
  35 sid1= sid2=
  36
  37 for f
  38 do
  39         case $f in
  40         -*)
  41                 case $f in
  42                 --brief)
  43                         DIFF=cmp;;
  44                 -q)
  45                         echo=:;;
  46                 -r?*)
  47                         case $sid1 in
  48                         '')
  49                                 sid1=$f
  50                                 ;;
  51                         *)
  52                                 case $sid2 in
  53                                 ?*) echo "$usage" >&2; exit 2 ;;
  54                                 esac
  55                                 sid2=$f
  56                                 ;;
  57                         esac
  58                         ;;
  59                 *)
  60                         options="$options $f"
  61                         ;;
  62                 esac
  63                 shift
  64                 ;;
  65         *)
  66                 break
  67                 ;;
  68         esac
  69 done
  70
  71 case $# in
  72 0)
  73         echo "$usage" >&2
  74         exit 2
  75 esac
  76
  77
  78 rev1= rev2= status=0
  79 trap 'status=2; exit' 1 2 13 15
  80 trap 'rm -f $rev1 $rev2 || status=2; exit $status' 0
  81
  82 for f
  83 do
  84         s=2
  85
  86         case $f in
  87         s.* | */s.*)
  88                 if
  89                         rev1=`mktemp /tmp/geta.XXXXXXXX`
  90                         sccs get -s -p -k $sid1 "$f" > $rev1 &&
  91                         case $sid2 in
  92                         '')
  93                                 workfile=`expr " /$f" : '.*/s.\(.*\)'`
  94                                 ;;
  95                         *)
  96                                 rev2=`mktemp /tmp/getb.XXXXXXXX`
  97                                 sccs get -s -p -k $sid2 "$f" > $rev2
  98                                 workfile=$rev2
  99                         esac
 100                 then
 101                         $echo $DIFF $options $rev1 $workfile >&2
 102                         $DIFF $options $rev1 $workfile
 103                         s=$?
 104                 fi
 105                 ;;
 106         *)
 107                 echo "$0: $f is not an SCCS file" >&2
 108         esac
 109
 110         if test $status -lt $s
 111         then status=$s
 112         fi
 113 done
 114