1#!/bin/sh
2# Extract the initialization actions from source files.
3#
4#  Copyright (C) 1996, 97, 98, 99, 2000, 2001, 2002, 2004, 2006, 2008 Free Software Foundation, Inc.
5#
6# This program is free software; you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation; either version 2, or (at your option)
9# any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this software; see the file COPYING.  If not, write to
18# the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19# Boston, MA 02110-1301 USA
20
21# Commentary:
22
23# Usage: guile-snarf [-o OUTFILE] [CPP-ARGS ...]
24
25# Initialization actions are extracted to OUTFILE or to standard
26# output when no OUTFILE has been specified or when OUTFILE is "-".
27# The C preprocessor is called with CPP-ARGS (which usually include a
28# input file) and the output is filtered for the actions.
29#
30# If there are errors during processing, OUTFILE is deleted and the
31# program exits with non-zero status.
32#
33# During snarfing, the pre-processor macro SCM_MAGIC_SNARFER is
34# defined.  You can use this to avoid including snarfer output files
35# that don't yet exist by writing code like this:
36#
37#   #ifndef SCM_MAGIC_SNARFER
38#   #include "foo.x"
39#   #endif
40#
41# If the environment variable CPP is set, use its value instead of the
42# C pre-processor determined at Guile configure-time: "@CPP@".
43
44# Code:
45
46## funcs
47
48modern_snarf ()                         # writes stdout
49{
50    ## Apparently, AIX's preprocessor is unhappy if you try to #include an
51    ## empty file.
52    echo "/* cpp arguments: $@ */" ;
53    ${cpp} -DSCM_MAGIC_SNARF_INITS -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_ok_p=true
54    sed -e 's/\^ *\^/\
55^^/g' ${temp} | grep "^.*\^ *\^" | sed -e "s/^.*\^ *\^//" -e "s/\^\ *:\ *\^.*/;/"
56}
57
58## main
59
60# process command line
61if [ x"$1" = x--help ] ; then
62    @AWK@ '/^#.Commentary:/,/^#.Code:/' $0 | grep -v Code: \
63        | sed -e 1,2d -e 's/^. *//g'
64    exit 0
65fi
66if [ x"$1" = x-o ]
67    then outfile="$2" ; shift ; shift ;
68    else  outfile="-" ;
69fi
70
71# set vars and handler -- handle CPP override
72cpp_ok_p=false
73
74if [ x"$TMPDIR" = x ]; then TMPDIR="/tmp" ; else : ; fi
75tempdir="$TMPDIR/guile-snarf.$$"
76(umask 077 && mkdir $tempdir) || exit 1
77temp="$tempdir/tmp"
78
79if [ x"$CPP" = x ] ; then cpp="@CPP@" ; else cpp="$CPP" ; fi
80
81trap "rm -rf $tempdir" 0 1 2 15
82
83if [ ! "$outfile" = "-" ] ; then
84    modern_snarf "$@" > $outfile
85else
86    modern_snarf "$@"
87fi
88
89# zonk outfile if errors occurred
90if $cpp_ok_p ; then
91    exit 0
92else
93    [ ! "$outfile" = "-" ] && rm -f $outfile
94    exit 1
95fi
96
97# guile-snarf ends here
98