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#!/usr/bin/perl -w

=head1 NAME

dh_phpcomposer - calculates PHP Composer substvars

=head1 SYNOPSIS

B<dh_phpcomposer> [S<I<debhelper options>>] [S<I<options>>]

=head1 DESCRIPTION

B<dh_phpcomposer> is a debhelper program that is responsible for generating
the B<${phpcomposer:*}> substitutions and adding them to substvars files.

The program will look for F<composer.json> file in the package root,
and will use this information to generate:

=over 2

=item *

B<${phpcomposer:name}> and B<${phpcomposer:description}>

=item *

B<${phpcomposer:Debian-require}>, B<${phpcomposer:Debian-require-dev}>,
B<${phpcomposer:Debian-conflict}>, B<${phpcomposer:Debian-replace}>,
B<${phpcomposer:Debian-provide}>, B<${phpcomposer:Debian-suggest}> and
B<${phpcomposer:Debian-recommend}>

=back

Those variables will be substituted into the package's F<control>
file wherever the token B<${phpcomposer:*}> are placed.

This feature requires pkg-php-tools (>= 1.7~).

=head1 OPTIONS

=over 4

=item B<--sourcedirectory=>I<directory>

Assume that the original package source tree is at the specified directory
rather than the top level directory of the Debian source package tree.

This feature requires pkg-php-tools (>= 1.14~).

=back

=head1 FILES

=over 4

=item F<debian/pkg-php-tools-overrides>

Package that don't want to follow automatic Composer package name to Debian package
name conversion can override the conversion by creating this file.

More information is available in L<dh_phppear(1)>.

=back

=cut

use strict;
use warnings;
use Cwd ();
use File::Spec;
use Debian::Debhelper::Dh_Lib;

sub _shell_exec {
	my $child_pid = open(my $output, "-|", @_) // error("@_ failed to fork: $!");
	if ($child_pid) {
		waitpid $child_pid, 0;
	} else {
		exit 0;
	}
	if ($? == -1) {
		error("@_ failed to execute: $!");
	}
	elsif ($? & 127) {
		error("@_ died with signal ".($? & 127));
	}
	elsif ($? != 0) {
		error("@_ returned exit code ".($? >> 8));
	}
	return $output;
}

my $opt_sourcedir = '.';
init(options => {
	"D=s" => \$opt_sourcedir,
	"sourcedirectory=s" => \$opt_sourcedir,
});

# Check and canonalize $opt_sourcedir
{
	# Get relative sourcedir abs_path (without symlinks)
	my $abspath = Cwd::abs_path($opt_sourcedir);
	my $cwd = Cwd::getcwd();
	if (! -d $abspath || $abspath !~ /^\Q$cwd\E/) {
		error("invalid or non-existing path to the source directory: ".$opt_sourcedir);
	}
	$opt_sourcedir = File::Spec->abs2rel($abspath, $cwd);
}

foreach my $package (@{$dh{DOPACKAGES}}) {
	if (-e File::Spec->catfile($opt_sourcedir, "composer.json")) {
		my $substvars = _shell_exec('/usr/bin/pkgtools', '-v', '--sourcedirectory', $opt_sourcedir, 'phpcomposer', 'substvars');
		while (<$substvars>) {
			if (/^([^=]+)=\s*(.*)$/) {
				addsubstvar($package, $1, $2);
			} else {
				warning("Malformed line: $_");
			}
		}
	}
}

=head1 CONFORMING TO

Debian policy, version 3.9.6.

PHP PEAR policy, version yet-to-be-written.

=head1 SEE ALSO

L<debhelper(7)>,
L<pkg-php-tools(7)>,
F</usr/share/doc/pkg-php-tools/README.Composer>

=head1 AUTHOR

Mathieu Parent <sathieu@debian.org>

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