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#!@PERL@ -w
# This script is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# See the COPYING and AUTHORS files for more details.
# Extract or update a section from a combined patch + documentation +
# meta information file.
use FileHandle;
use Getopt::Long;
use File::Temp qw(tempfile);
use strict;
my $select;
my $update;
if (!GetOptions("s|select=s" => \$select,
"u|update=s" => \$update) ||
(!defined $select && !defined $update)) {
print STDERR "USAGE: $0 {-s|-u} section file [< replacement]\n";
exit 1;
}
foreach my $arg (@ARGV) {
my $fh;
if (! -e $arg) {
$fh = new FileHandle("/dev/null");
} elsif ($arg =~ /\.gz$/) {
$fh = new FileHandle("gzip -cd $arg |");
} elsif ($arg =~ /\.bz2$/) {
$fh = new FileHandle("bzip2 -cd $arg |");
} else {
$fh = new FileHandle("< $arg");
}
unless ($fh) {
print STDERR "$arg: $!\n";
next;
}
if (defined $select) {
my $section = "head";
my $newline = "";
while (<$fh>) {
if (/^%(.*)/) {
last if $section eq $select;
$section = $1;
next;
}
if ($section eq $select) {
print $newline;
if ($_ eq "\n") {
$newline = $_;
} else {
$newline="";
print;
}
}
}
} elsif (defined $update) {
my ($fh2, $tempname) = tempfile("$arg.XXXXXX");
if ($arg =~ /\.gz$/) {
$fh2->close();
if (! -e $tempname) {
die "File $tempname disappeared!\n";
}
$fh2 = new FileHandle("| gzip -c > $tempname");
} elsif ($arg =~ /\.bz2$/) {
$fh2->close();
if (! -e $tempname) {
die "File $tempname disappeared!\n";
}
$fh2 = new FileHandle("| bzip2 -c > $tempname");
}
unless ($fh2) {
die "$tempname: $!\n";
}
# Copy things before updated section
my $last_was_newline=1; # start first section in first line
while (<$fh>) {
if (/^%(.*)/ && $1 eq $update) {
last;
}
$last_was_newline = ($_ eq "\n");
print $fh2 $_;
}
print $fh2 "\n"
unless ($last_was_newline);
# Create/replace updated section
print $fh2 "%$update\n";
while (<STDIN>) {
print $fh2 $_;
}
print $fh2 "\n";
# Skip obsolete section
while (<$fh>) {
if (/^%(.*)/) {
print $fh2 $_;
last;
}
}
# Copy things after updated section
while (<$fh>) {
print $fh2 $_;
}
unless (close $fh2) {
die "$arg.patch: $!\n";
}
if (-e $arg) {
unlink "$arg~";
unless (rename $arg, "$arg~") {
die "Failed to rename $arg to $arg~: $!\n";
}
}
unless (rename $tempname, $arg) {
rename("$arg~", $arg);
die "Failed to rename $arg.parse to $arg: $!\n";
}
}
close $fh;
}
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