require 5;
use Getopt::Long;
my $USAGE = <<ENDUSAGE;
Remove \@tindex lines from files that were already present in previous
versions.
Usage: $0 [--old=EXT] FILE...
$0 --help
$0 --version
--help display this help and exit
--version print version and exit
--old=DIR find old files in DIR
The script performs two passes. In the first pass, Texinfo files from
DIR are scanned for \@tindex lines, and identifiers in them are
recorded. In a second pass, Texinfo files in the current directory
are scanned, and \@tindex lines for identifiers that were recorded in
the first pass are removed. Old file contents are saved in files
with extension ".orig". A list of modified files and removed \@tindex
identifiers is printed to stdout at the end.
ENDUSAGE
sub fatal {
print STDERR "$0: ", @_, ".\n";
exit 1;
}
my $help = 0;
my $version = 0;
my $old;
my $rc = GetOptions ('help' => \$help, 'version' => \$version,
'old=s' => \$old);
if ($version) {
print "0.1\n";
exit 0;
} elsif (!$rc || !$old || @ARGV) {
print $USAGE;
exit 1;
} elsif ($help) {
print $USAGE;
exit 0;
}
my %tindex;
my %removed;
my @old_files = glob "$old/*.texi";
my @new_files = glob "*.texi";
fatal ("No Texinfo files found in `$old'") unless @old_files;
fatal ("No Texinfo files found in current directory") unless @new_files;
print "Scanning old files for \@tindex lines\n";
foreach $file (@old_files) {
open (IN, "<$file") or fatal "Cannot open $file: $!";
while (<IN>) {
++$tindex{$1} if /^\s*\@tindex\s+(\S+)/;
}
close IN;
}
print "Removing old \@tindex lines\n";
foreach $file (@new_files) {
my $modified = 0;
my $contents = "";
open (IN, "< $file") or fatal "Cannot open $file.orig for reading: $!";
while (<IN>) {
if (/^\s*\@tindex\s+(\S+)/ && $tindex{$1}) {
++$removed{$1};
$modified = 1;
} else {
$contents = $contents . $_;
}
}
close IN;
if ($modified) {
print " $file\n";
system ("cp $file $file.orig") == 0 or fatal "Cannot backup $file: $!";
open (OUT, ">$file") or fatal "Cannot open $file for writing: $!";
print OUT $contents;
close OUT;
}
}
print "Removed \@tindex commands for:\n";
my $key;
foreach $key (keys %removed) {
print " $key\n";
}