libguile/guile-snarf.in

   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,
   5 #    2009, 2014 Free Software Foundation, Inc.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU Lesser General Public License as
   9 # published by the Free Software Foundation; either version 3, or (at
  10 # your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 # Lesser General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU Lesser General Public
  18 # License along with this software; see the file COPYING.LESSER.  If
  19 # not, write to the Free Software Foundation, Inc., 51 Franklin
  20 # Street, Fifth Floor, Boston, MA 02110-1301 USA
  21
  22 # Commentary:
  23
  24 # Usage: guile-snarf [-o OUTFILE] [CPP-ARGS ...]
  25
  26 # Initialization actions are extracted to OUTFILE or to standard
  27 # output when no OUTFILE has been specified or when OUTFILE is "-".
  28 # The C preprocessor is called with CPP-ARGS (which usually include a
  29 # input file) and the output is filtered for the actions.
  30 #
  31 # If there are errors during processing, OUTFILE is deleted and the
  32 # program exits with non-zero status.
  33 #
  34 # During snarfing, the pre-processor macro SCM_MAGIC_SNARFER is
  35 # defined.  You can use this to avoid including snarfer output files
  36 # that don't yet exist by writing code like this:
  37 #
  38 #   #ifndef SCM_MAGIC_SNARFER
  39 #   #include "foo.x"
  40 #   #endif
  41 #
  42 # If the environment variable CPP is set, use its value instead of the
  43 # C pre-processor determined at Guile configure-time: "@CPP@".
  44
  45 # Code:
  46
  47 ## funcs
  48
  49 modern_snarf ()                         # writes stdout
  50 {
  51     ## Apparently, AIX's preprocessor is unhappy if you try to #include an
  52     ## empty file.
  53     echo "/* cpp arguments: $@ */" ;
  54     ${cpp} -DSCM_MAGIC_SNARF_INITS -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_ok_p=true
  55     sed -ne 's/ *\^ *\^ */\
  56 /
  57 s/.*\n//
  58 t x
  59 d
  60 : x
  61 s/ *\^ *: *\^ */;\
  62 /
  63 t y
  64 N
  65 s/\n\(#.*\)/ /
  66 s/\n/ /
  67 t x
  68 : y
  69 P
  70 D' ${temp}
  71 }
  72
  73 ## main
  74
  75 # process command line
  76 if [ x"$1" = x--help ] ; then
  77     @AWK@ '/^#.Commentary:/,/^#.Code:/' $0 | grep -v Code: \
  78         | sed -e 1,2d -e 's/^. *//g'
  79     exit 0
  80 fi
  81 if [ x"$1" = x-o ]
  82     then outfile="$2" ; shift ; shift ;
  83     else  outfile="-" ;
  84 fi
  85
  86 # set vars and handler -- handle CPP override
  87 cpp_ok_p=false
  88
  89 if [ x"$TMPDIR" = x ]; then TMPDIR="/tmp" ; else : ; fi
  90 tempdir="$TMPDIR/guile-snarf.$$"
  91 (umask 077 && mkdir $tempdir) || exit 1
  92 temp="$tempdir/tmp"
  93
  94 if [ x"$CPP" = x ] ; then cpp="@CPP@" ; else cpp="$CPP" ; fi
  95
  96 trap "rm -rf $tempdir" 0 1 2 15
  97
  98 if [ ! "$outfile" = "-" ] ; then
  99     modern_snarf "$@" > $outfile
 100 else
 101     modern_snarf "$@"
 102 fi
 103
 104 # zonk outfile if errors occurred
 105 if $cpp_ok_p ; then
 106     exit 0
 107 else
 108     [ ! "$outfile" = "-" ] && rm -f $outfile
 109     exit 1
 110 fi
 111
 112 # guile-snarf ends here