#!/usr/bin/perl

=head1 NAME

dh_installemacsen - register an Emacs add on package

=cut

use strict;
use warnings;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_installemacsen> [S<I<debhelper options>>] [B<-n>] [B<--priority=>I<n>] [B<--flavor=>I<foo>]

=head1 DESCRIPTION

B<dh_installemacsen> is a debhelper program that is responsible for installing
files used by the Debian B<emacsen-common> package into package build
directories.

It also automatically generates the F<preinst> F<postinst> and F<prerm>
commands needed to register a package as an Emacs add on package. The commands
are added to the maintainer scripts by B<dh_installdeb>. See
L<dh_installdeb(1)> for an explanation of how this works.

=head1 FILES

=over 4

=item debian/I<package>.emacsen-compat

Installed into F<usr/lib/emacsen-common/packages/compat/package> in the
package build directory.

=item debian/I<package>.emacsen-install

Installed into F<usr/lib/emacsen-common/packages/install/package> in the
package build directory.

=item debian/I<package>.emacsen-remove

Installed into F<usr/lib/emacsen-common/packages/remove/package> in the
package build directory.

=item debian/I<package>.emacsen-startup

Installed into etc/emacs/site-start.d/50I<package>.el in the package
build directory. Use B<--priority> to use a different priority than 50.

=back

=head1 OPTIONS

=over 4

=item B<-n>, B<--no-scripts>

Do not modify F<postinst>/F<prerm> scripts.

=item B<--priority=>I<n>

Sets the priority number of a F<site-start.d> file. Default is 50.

=item B<--flavor=>I<foo>

Sets the flavor a F<site-start.d> file will be installed in. Default is
B<emacs>, alternatives include B<xemacs> and B<emacs20>.

=back

=head1 NOTES

Note that this command is not idempotent. L<dh_prep(1)> should be called
between invocations of this command. Otherwise, it may cause multiple
instances of the same text to be added to maintainer scripts.

=cut

init(options => {
	"flavor=s" => \$dh{FLAVOR},
});

if (! defined $dh{PRIORITY}) {
	$dh{PRIORITY}=50;
}
if (! defined $dh{FLAVOR}) {
	$dh{FLAVOR}='emacs';
}

# PROMISE: DH NOOP WITHOUT emacsen-common emacsen-install emacsen-remove emacsen-startup

foreach my $package (@{$dh{DOPACKAGES}}) {
	my $tmp=tmpdir($package);

	my $emacsen_compat=pkgfile($package,"emacsen-compat");
	my $emacsen_install=pkgfile($package,"emacsen-install");
	my $emacsen_remove=pkgfile($package,"emacsen-remove");
	my $emacsen_startup=pkgfile($package,"emacsen-startup");

	if ($emacsen_compat ne '') {
		install_dir("$tmp/usr/lib/emacsen-common/packages/compat");
		install_file($emacsen_compat,
					 "$tmp/usr/lib/emacsen-common/packages/compat/$package");
	}

	if ($emacsen_install ne '') {
		install_dir("$tmp/usr/lib/emacsen-common/packages/install");
		install_prog($emacsen_install,"$tmp/usr/lib/emacsen-common/packages/install/$package");
	}

	if ($emacsen_remove ne '') {
		install_dir("$tmp/usr/lib/emacsen-common/packages/remove");
		install_prog("$emacsen_remove","$tmp/usr/lib/emacsen-common/packages/remove/$package");
	}

	if ($emacsen_startup ne '') {
		install_dir("$tmp/etc/$dh{FLAVOR}/site-start.d/");
		install_file($emacsen_startup,"$tmp/etc/$dh{FLAVOR}/site-start.d/$dh{PRIORITY}$package.el");
	}

	if ($emacsen_install ne '' || $emacsen_remove ne '') {
		if (! $dh{NOSCRIPTS}) {
			autoscript($package,"preinst","preinst-emacsen",
				"s/#PACKAGE#/$package/g");
			autoscript($package,"postinst","postinst-emacsen",
				"s/#PACKAGE#/$package/g");
			autoscript($package,"prerm","prerm-emacsen",
				"s/#PACKAGE#/$package/g");
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>
L</usr/share/doc/emacsen-common/debian-emacs-policy.gz>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut

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