mdw@git.distorted.org.uk Git - cfd/blob - confsubst.in

   1 #! /bin/sh
   2 ### -*-sh-*-
   3 ###
   4 ### Make autoconf-like substitutions in files
   5 ###
   6 ### (c) 2008 Mark Wooding
   7 ###
   8
   9 ###----- Licensing notice ---------------------------------------------------
  10 ###
  11 ### This file is part of the Common Files Distribution (`common').
  12 ###
  13 ### `Common' is free software; you can redistribute it and/or modify
  14 ### it under the terms of the GNU General Public License as published by
  15 ### the Free Software Foundation; either version 2 of the License, or
  16 ### (at your option) any later version.
  17 ###
  18 ### `Common' is distributed in the hope that it will be useful,
  19 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ### GNU General Public License for more details.
  22 ###
  23 ### You should have received a copy of the GNU General Public License
  24 ### along with `common'; if not, write to the Free Software Foundation,
  25 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26
  27 set -e
  28 VERSION="@VERSION@"
  29
  30 ###--------------------------------------------------------------------------
  31 ### Parse command line arguments.
  32
  33 while [ $# -gt 0 ]; do
  34   case $1 in
  35     -h | --h | --he | --hel | --help)
  36       cat <<EOF
  37 Usage: confsubst FILE TAG=VALUE...
  38
  39 Replaces occurrences of @TAG@ in FILE with VALUE, and writes the result to
  40 standard output.
  41 EOF
  42       exit 0
  43       ;;
  44     -v | --v | --ve | --ver | --vers | --versi | --versio | --version)
  45       echo "confsubst: Common Files Distribution version $VERSION"
  46       exit 0
  47       ;;
  48     --)
  49       shift
  50       break
  51       ;;
  52     -)
  53       break
  54       ;;
  55     -*)
  56       echo "confsubst: unknown option \`$1'" >&2
  57       exit 1
  58       ;;
  59     *)
  60       break
  61       ;;
  62   esac
  63   shift
  64 done
  65
  66 if [ $# -lt 1 ]; then
  67   echo >&2 "Usage: confsubst FILE TAG=VALUE..."
  68   exit 1
  69 fi
  70 file=$1; shift
  71
  72 ###--------------------------------------------------------------------------
  73 ### Main code.
  74
  75 subst=""
  76 for fixup; do
  77   case "$fixup" in
  78     *?=*?) ;;
  79     *) echo >&2 "$0: bad substitution: $fixup"; exit 1 ;;
  80   esac
  81   tag=$(echo "$fixup" | sed 's/=.*$//') && \
  82   value=$(echo "$fixup" | sed 's/^[^=]*=//') && \
  83   subst="$subst s\a@$tag@\a$value\ag;"
  84 done
  85
  86 sed "$subst" $file || exit $?
  87
  88 ###----- That's all, folks --------------------------------------------------