Re: snarfer guard macro name decision: SCM_MAGIC_SNARFER

[Thien-Thi Nguyen]

   From: Rob Browning <address@hidden>
   Date: Wed, 13 Mar 2002 16:00:33 -0600

   Is there any easy way I can get back the 1.5 functionality of a few
   months ago (i.e. is your stuff in a good enough state to check in for
   even light use, or is there perhaps some temporary hack I can use for
   right now?)

   I ask because I'm suddenly in a situation where need to use 1.5 with
   gnome-guile again, and I'd prefer to use the current source rather
   than checking out an older 1.5 -- I'm not positive, but I think
   gnome-guile worked with 1.5 as of a month or two ago...

see below for guile-snarf.in snapshot.  feedback welcome!

to play, modify Makefile.am to look like:

  snarfcppopts = $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)

  .c.x:
        ./guile-snarf --compat=1.4 $< $(snarfcppopts)

(this is what i've done locally, except w/o the "--compat=1.4" for HEAD
and branch_release-1-6.  WARNING: the old_school_snarf is incomplete.)

thi

____________________________________
#!/bin/sh
# Extract the initialization actions for builtin things.
#
#  Copyright (C) 1996, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, 
Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this software; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
# Boston, MA 02111-1307 USA

# Commentary:

# Usage: guile-snarf [--compat=1.4] [-o OUTFILE] INFILE [CPP-OPTIONS ...]
#
# Process INFILE using the C pre-processor and some other programs.
# Write output to a file, named OUTFILE if specified, or STEM.x if
# INFILE looks like STEM.c and no OUTFILE is specified.  Ignore
# lines from the input matching grep(1) regular expression:
#
#       ^#include ".*OUTFILE"
#
# If there are errors during processing, delete OUTFILE and exit with
# non-zero status.
#
# Optional arg "--compat=1.4" means emulate guile-1.4 guile-snarf.
# This option is not fully tested -- see Guile reference manual.
#
# If env var CPP is set, use its value instead of the C pre-processor
# determined at Guile configure-time: "@CPP@".

# Code:

[ x$DEBUG = x1 ] && set -x

old_school_snarf ()
{
$cpp -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_status=true
grep "^ *SCM__I" ${temp} | sed -e "s/^ *SCM__I//" -e 's/SCM__D.*$//g'
# TODO TODO TODO: here we need to handle changes like:
#                 scm_make_gsubr -> scm_c_define_gsubr
#                 (probably sed is ok)
}

modern_snarf ()
{
$cpp -DSCM_MAGIC_SNARF_INITS "$@" > ${temp} && cpp_status=true
grep "^ *\^ *\^" ${temp} | sed -e "s/^ *\^ *\^//"
}

## main

# process command line
if [ x"$1" = x--help ] ; then
    @AWK@ '/^#.Commentary:/,/^#.Code:/' $0 | grep -v Code: \
        | sed -e 1,2d -e 's/^. *//g'
    exit 0
fi
if [ x"$1" = x--compat=1.4 ]
    then snarf=old_school_snarf ; shift
    else snarf=modern_snarf
fi
if [ x"$1" = x-o ]
    then outfile=$2 ; shift ; shift ; infile=$1 ; shift
    else infile=$1 ; shift ; outfile=`basename $infile .c`.x
fi

[ x"$infile" = x ] && { echo $0: No input file ; exit 1 ; }
[ ! -f "$infile" ] && { echo $0: No such file: $infile ; exit 1 ; }

# set vars and handler -- handle CPP override
cpp_status=false
temp="/tmp/snarf.$$"
if [ x"$CPP" = x ] ; then cpp="@CPP@" ; else cpp="$CPP" ; fi 
self_blind_regexp='^#include ".*'`basename $outfile`'"'
clean_infile=clean-`basename $infile`
trap "rm -f $temp $clean_infile" 0 1 2 15

# do the snarfing -- output something extra for needy cpp programs (AIX)
{ echo "/* source: $infile */" ;
  echo "/* cpp-options: $@ */" ;
  grep -v "$self_blind_regexp" $infile > $clean_infile ;
  $snarf "$@" $clean_infile ;
} > $outfile

# zonk outfile if errors occurred
if $cpp_status ; then
    exit 0
else
    rm -f $outfile
    exit 1
fi

# guile-snarf ends here