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#!/usr/bin/perl
use warnings;
use strict;
use v5.10.1;
use Cwd qw(abs_path);
use Getopt::Long;
use Module::Load;
use Module::Load::Conditional qw(can_load);
my %opts = (
input => '@BUILDSCRIPT@',
template_dir => '@TEMPLATE_DIR@',
);
my $template_name_charset = qr/[[:alnum:]+_.@-]/;
my $template_marker = qr/# template/;
# runtime loading to avoid dependency on cpan since this is the only non-core module
my $loaded_gettext = can_load(modules => {'Locale::gettext' => undef});
if ($loaded_gettext) {
Locale::gettext::bindtextdomain("pacman-scripts", '@localedir@');
Locale::gettext::textdomain("pacman-scripts");
}
sub gettext {
my ($string) = @_;
if ($loaded_gettext) {
return Locale::gettext::gettext($string);
} else {
return $string;
}
}
sub burp {
my ($file_name, @lines) = @_;
open (my $fh, ">", $file_name) || die sprintf(gettext("can't create '%s': %s"), $file_name, $!);
print $fh @lines;
close $fh;
}
# read a template marker line and parse values into a hash
# format is "# template (start|input); key=value; key2=value2; ..."
sub parse_template_line {
my ($line, $filename, $linenumber) = @_;
my %values;
my ($marker, @elements) = split(/;\s?/, $line);
($values{command}) = ($marker =~ /$template_marker (.*)/);
foreach my $element (@elements) {
my ($key, $val) = ($element =~ /^([a-z0-9]+)=(.*)$/);
unless ($key and $val) {
die gettext("invalid key/value pair\n%s:%s: %s"),
"$filename:$linenumber: $line";
}
$values{$key} = $val;
}
# end doesn't take arguments
if ($values{command} ne "end") {
if (!$values{name}) {
die gettext("invalid template line: can't find template name\n"),
"$filename:$linenumber: $line";
}
unless ($values{name} =~ /^$template_name_charset+$/) {
die sprintf(gettext("invalid chars used in name '%s'. allowed: [:alnum:]+_.\@-\n"), $values{name}),
"$filename:$linenumber: $line";
}
}
return \%values;
}
# load a template, process possibly existing markers (nested templates)
sub load_template {
my ($values) = @_;
my $ret = "";
my $path;
if (!$opts{newest} and $values->{version}) {
$path = "$opts{template_dir}/$values->{name}-$values->{version}.template";
} else {
$path = "$opts{template_dir}/$values->{name}.template";
}
# resolve symlink(s) and use the real file's name for version detection
my ($version) = (abs_path($path) =~ /-([0-9.]+)[.]template$/);
if (!$version) {
die sprintf(gettext("Couldn't detect version for template '%s'"), $values->{name});
}
my $parsed = process_file($path);
$ret .= "# template start; name=$values->{name}; version=$version;\n";
$ret .= $parsed;
$ret .= "# template end;\n";
return $ret;
}
# process input file and load templates for all markers found
sub process_file {
my ($filename) = @_;
my $ret = "";
my $nesting_level = 0;
my $linenumber = 0;
open (my $fh, "<", $filename) or die sprintf(gettext("failed to open '%s': %s"), $filename, $!);
my @lines = <$fh>;
close $fh;
foreach my $line (@lines) {
$linenumber++;
if ($line =~ $template_marker) {
my $values = parse_template_line($line, $filename, $linenumber);
if ($values->{command} eq "start" or $values->{command} eq "input") {
if ($nesting_level == 0) {
$ret .= load_template($values);
}
} elsif ($values->{command} eq "end") {
# nothing to do here, just for completeness
} else {
die sprintf(gettext("Unknown template marker '%s'\n"), $values->{command}),
"$filename:$linenumber: $line";
}
$nesting_level++ if $values->{command} eq "start";
$nesting_level-- if $values->{command} eq "end";
# marker lines should never be added
next;
}
# we replace code inside blocks with the template
# so we ignore the content of the block
next if $nesting_level > 0;
$ret .= $line;
}
return $ret;
}
sub usage {
my ($exitstatus) = @_;
print gettext("makepkg-template [options]\n");
print "\n";
print gettext("Options:\n");
printf(gettext(" --input, -p <file> Build script to read (default: %s)\n"), '@BUILDSCRIPT@');
print gettext(" --output, -o <file> file to output to (default: input file)\n");
print gettext(" --newest, -n update templates to newest version\n");
print gettext(" (default: use version specified in the template markers)\n");
print gettext(" --template-dir <dir> directory to search for templates\n");
printf(gettext(" (default: %s)\n"), '@TEMPLATE_DIR@');
print "\n";
exit($exitstatus);
}
Getopt::Long::Configure ("bundling");
GetOptions(
"help" => sub {usage(0); },
"h" => sub {usage(0); },
"input|p=s" => \$opts{input},
"output|o=s" => \$opts{output},
"newest|n" => \$opts{newest},
"template-dir=s" => \$opts{template_dir},
) or usage(1);
$opts{output} = $opts{input} unless $opts{output};
$opts{input} = "/dev/stdin" if $opts{input} eq "-";
$opts{output} = "/dev/stdout" if $opts{output} eq "-";
burp($opts{output}, process_file($opts{input}));
# vim: set noet:
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