#!/usr/bin/perl
# -*- perl -*-

#   Copyright (C) 2001-2022 Free Software Foundation, Inc.
#
# This file is part of the libiberty library.
# Libiberty is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# Libiberty 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with libiberty; see the file COPYING.LIB.  If not,
# write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
# Boston, MA 02110-1301, USA.
#
# Originally written by DJ Delorie <dj@redhat.com>



# This program looks for texinfo snippets in source files and other
# files, and builds per-category files with entries sorted in
# alphabetical order.

# The syntax it looks for is lines starting with '@def' in *.c and
# other files (see TEXIFILES in Makefile.in).  Entries are terminated
# at the next @def* (which begins a new entry) or, for C files, a line
# that begins with '*/' without leading spaces (this assumes that the
# texinfo snippet is within a C-style /* */ comment).

# 



if ($ARGV[0] eq "-v") {
    $verbose = 1;
    shift;
}

$srcdir = shift;
$outfile = shift;

if ($outfile !~ /\S/ || ! -f "$srcdir/Makefile.in" ) {
    print STDERR "Usage: gather-docs [-v] srcdir outfile.txi [files with snippets in them ...]\n";
    exit 1;
}

$errors = 0;

for $in (@ARGV) {

    if (!open(IN, "$srcdir/$in")) {
	print STDERR "Cannot open $srcdir/$in for reading: $!\n";
	$errors ++;

    } else {
	$first = 1;
	$pertinent = 0;
	$man_mode = 0;
	$line = 0;

	while (<IN>) {
	    $line ++;
	    $pertinent = 1 if /^\@def[a-z]*[a-wyz] /;
	    $pertinent = 0 if /^\*\//;
	    next unless $pertinent;

	    if (/^\@def[a-z]*[a-wyz] /) {
		
		($name) = m/[^\(]* ([^\( \t\r\n\@]+) *(\(|\@?$)/;
		$name =~ s/[	 ]*\@?$//;
		$key = $name;
		$key =~ tr/A-Z/a-z/;
		$key =~ s/[^a-z0-9]+/ /g;
		$name{$key} = $node;
		$lines{$key} = '';
		$src_file{$key} = $in;
		$src_line{$key} = $line;
		print "\nReading $in :" if $verbose && $first;
		$first = 0;
		print " $name" if $verbose;
		$node_lines{$key} .= $_;

	    } else {
		$node_lines{$key} .= $_;
	    }

	    $pertinent = 0 if /^\@end def/;
	}
	close (IN);
    }
}

print "\n" if $verbose;
exit $errors if $errors;

if (!open (OUT, "> $outfile")) {
    print STDERR "Cannot open $outfile for writing: $!\n";
    $errors ++;
    next;
}
print "Writing $outfile\n" if $verbose;

print OUT "\@c Automatically generated from *.c and others (the comments before\n";
print OUT "\@c each entry tell you which file and where in that file).  DO NOT EDIT!\n";
print OUT "\@c Edit the *.c files, configure with --enable-maintainer-mode,\n";
print OUT "\@c run 'make stamp-functions' and gather-docs will build a new copy.\n\n";

for $key (sort keys %name) {
    print OUT "\@c $src_file{$key}:$src_line{$key}\n";
    print OUT $node_lines{$key};
    print OUT "\n";
}

if (! print OUT "\n") {
    print STDERR "Disk full writing $srcdir/$cat.texi\n";
    $errors ++;
}

close (OUT);

exit $errors;