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name : dh_installwm
 #!/usr/bin/perl

=head1 NAME

dh_installwm - register a window manager

=cut

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

our $VERSION = DH_BUILTIN_VERSION;

=head1 SYNOPSIS

B<dh_installwm> [S<I<debhelper options>>] [B<-n>] [B<--priority=>I<n>] [S<I<wm> ...>]

=head1 DESCRIPTION

B<dh_installwm> is a debhelper program that is responsible for
generating the F<postinst> and F<prerm> commands that register a window manager
with L<update-alternatives(8)>. The window manager's man page is also 
registered as a slave symlink (in v6 mode and up).  It must be installed in
F<usr/share/man/man1/> in the package build directory prior to calling
B<dh_installwm>.  In compat 9 and earlier, the manpage was optional.

=head1 FILES

=over 4

=item debian/I<package>.wm

List window manager programs to register.

Supports substitution variables in compat 13 and later as
documented in L<debhelper(7)>.

=back

=head1 OPTIONS

=over 4

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

Set the priority of the window manager. Default is 20, which is too low for
most window managers; see the Debian Policy document for instructions on
calculating the correct value.

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

Do not modify F<postinst>/F<prerm> scripts. Turns this command into a no-op.

=item B<-A>, B<--all>

Modify scripts for window managers specified by command line
parameters in ALL packages acted on, not just the first.

=item I<wm> ...

Window manager programs to register.

=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 => {
	"priority=s" => \$dh{PRIORITY},
});

if (! defined $dh{PRIORITY}) {
        $dh{PRIORITY}=20;
}

if (@ARGV) {
	# This is here for backwards compatibility. If the filename doesn't
	# include a path, assume it's in /usr/bin.
	if ($ARGV[0] !~ m:/:) {
		$ARGV[0]="/usr/bin/$ARGV[0]";
	}
}

my $nodocs = is_build_profile_active('nodoc') || get_buildoption('nodoc') ? 1 : 0;

# PROMISE: DH NOOP WITHOUT wm cli-options()

foreach my $package (@{$dh{DOPACKAGES}}) {
	my $tmp=tmpdir($package);
	my $file=pkgfile($package,"wm");

	my @wm;
	if ($file) {
		@wm=filearray($file, '.');
	}

	if (($package eq $dh{FIRSTPACKAGE} || $dh{PARAMS_ALL}) && @ARGV) {
		push @wm, @ARGV;
	}

	if (! $dh{NOSCRIPTS}) {
WM:		foreach my $wm (@wm) {
			autoscript($package,"prerm","prerm-wm", { 'WM' => $wm });

			my $wmman;
			foreach my $ext (".1", ".1x") {
				$wmman="/usr/share/man/man1/".basename($wm).$ext;
				if (-e "$tmp$wmman" || -e "$tmp$wmman.gz") {
					autoscript($package,"postinst","postinst-wm", { 'WM' => $wm, 'WMMAN' => "${wmman}.gz" , 'PRIORITY' => $dh{PRIORITY} });
					next WM;
				}
			}
			if (not compat(9) and not $nodocs) {
				error("no manpage found (creating an x-window-manager alternative requires a slave symlink for the manpage)");
			} else {
				warning("no manpage found (creating an x-window-manager alternative requires a slave symlink for the manpage)");
			}
			# Reaching this code means a broken package will be produced.
			autoscript($package,"postinst","postinst-wm-noman", { 'WM' => $wm, 'PRIORITY' => $dh{PRIORITY} });
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut
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