1#! /usr/bin/perl
2
3# Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005,
4#   2006, 2007  Free Software Foundation, Inc.
5#
6# This file is part of GNU Emacs.
7#
8# GNU Emacs is free software; you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation; either version 2, or (at your option)
11# any later version.
12#
13# GNU Emacs is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with GNU Emacs; see the file COPYING.  If not, write to the
20# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21# Boston, MA 02110-1301, USA.
22
23require 5;
24use Getopt::Long;
25
26my $USAGE = <<ENDUSAGE;
27Remove \@tindex lines from files that were already present in previous
28versions.
29
30Usage: $0 [--old=EXT] FILE...
31       $0 --help
32       $0 --version
33
34  --help	display this help and exit
35  --version	print version and exit
36  --old=DIR	find old files in DIR
37
38The script performs two passes.  In the first pass, Texinfo files from
39DIR are scanned for \@tindex lines, and identifiers in them are
40recorded.  In a second pass, Texinfo files in the current directory
41are scanned, and \@tindex lines for identifiers that were recorded in
42the first pass are removed.  Old file contents are saved in files
43with extension ".orig".  A list of modified files and removed \@tindex
44identifiers is printed to stdout at the end.
45ENDUSAGE
46
47sub fatal {
48    print STDERR "$0: ", @_, ".\n";
49    exit 1;
50}
51
52my $help = 0;
53my $version = 0;
54my $old;
55
56my $rc = GetOptions ('help' => \$help, 'version' => \$version,
57                     'old=s' => \$old);
58if ($version) {
59    print "0.1\n";
60    exit 0;
61} elsif (!$rc || !$old || @ARGV) {
62    print $USAGE;
63    exit 1;
64} elsif ($help) {
65    print $USAGE;
66    exit 0;
67}
68
69# Fill the hash %tindex with associations VAR -> COUNT where
70# the keys VAR are identifiers mentioned in @tindex lines in the older
71# files to process and COUNT is the number of times they are seen in
72# the files.
73
74my %tindex;
75my %removed;
76my @old_files = glob "$old/*.texi";
77my @new_files = glob "*.texi";
78fatal ("No Texinfo files found in `$old'") unless @old_files;
79fatal ("No Texinfo files found in current directory") unless @new_files;
80
81print "Scanning old files for \@tindex lines\n";
82foreach $file (@old_files) {
83    open (IN, "<$file") or fatal "Cannot open $file: $!";
84    while (<IN>) {
85	++$tindex{$1} if /^\s*\@tindex\s+(\S+)/;
86    }
87    close IN;
88}
89
90# Process current files and remove those @tindex lines which we
91# know were already present in the files scanned above.
92
93print "Removing old \@tindex lines\n";
94foreach $file (@new_files) {
95    my $modified = 0;
96    my $contents = "";
97
98    open (IN, "< $file") or fatal "Cannot open $file.orig for reading: $!";
99    while (<IN>) {
100	if (/^\s*\@tindex\s+(\S+)/ && $tindex{$1}) {
101	    ++$removed{$1};
102	    $modified = 1;
103	} else {
104	    $contents = $contents . $_;
105	}
106    }
107
108    close IN;
109
110    if ($modified) {
111	print "  $file\n";
112	system ("cp $file $file.orig") == 0 or fatal "Cannot backup $file: $!";
113	open (OUT, ">$file") or fatal "Cannot open $file for writing: $!";
114	print OUT $contents;
115	close OUT;
116    }
117}
118
119# Print a list of identifiers removed.
120
121print "Removed \@tindex commands for:\n";
122my $key;
123foreach $key (keys %removed) {
124    print "  $key\n";
125}
126
127# arch-tag: f8460df6-6bef-4c98-8555-e2c63a88b0fa
128