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