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

   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
  29 VERSION="@VERSION@"
  30
  31 ###--------------------------------------------------------------------------
  32 ### Parse command line arguments.
  33
  34 while [ $# -gt 0 ]; do
  35   case $1 in
  36     -h | --h | --he | --hel | --help)
  37       cat <<EOF
  38 Usage: confsubst FILE TAG=VALUE...
  39
  40 Replaces occurrences of @TAG@ in FILE with VALUE, and writes the result to
  41 standard output.
  42 EOF
  43       exit 0
  44       ;;
  45     -v | --v | --ve | --ver | --vers | --versi | --versio | --version)
  46       echo "confsubst: Common Files Distribution version $VERSION"
  47       exit 0
  48       ;;
  49     --)
  50       shift
  51       break
  52       ;;
  53     -)
  54       break
  55       ;;
  56     -*)
  57       echo "confsubst: unknown option \`$1'" >&2
  58       exit 1
  59       ;;
  60     *)
  61       break
  62       ;;
  63   esac
  64   shift
  65 done
  66
  67 if [ $# -lt 1 ]; then
  68   echo >&2 "Usage: confsubst FILE TAG=VALUE..."
  69   exit 1
  70 fi
  71 file=$1; shift
  72
  73 ###--------------------------------------------------------------------------
  74 ### Main code.
  75
  76 subst=""
  77 for fixup; do
  78   case "$fixup" in
  79     *?=*?) ;;
  80     *) echo >&2 "$0: bad substitution: $fixup"; exit 1 ;;
  81   esac
  82   tag=$(echo "$fixup" | sed 's/=.*$//') && \
  83   value=$(echo "$fixup" | sed 's/^[^=]*=//') && \
  84   subst="$subst s\a@$tag@\a$value\ag;"
  85 done
  86
  87 sed "$subst" $file || exit $?
  88
  89 ###----- That's all, folks --------------------------------------------------