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  #   	ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÂ„O:ÁÀ ?÷     	#!/usr/bin/perl
# SPDX-License-Identifier: GPL-2.0-or-later
use strict;

# Copyright (c) 2017-2020 Mauro Carvalho Chehab <mchehab@kernel.org>
#

my $prefix = "./";
$prefix = "$ENV{'srctree'}/" if ($ENV{'srctree'});

my $conf = $prefix . "Documentation/conf.py";
my $requirement_file = $prefix . "Documentation/sphinx/requirements.txt";
my $virtenv_prefix = "sphinx_";

#
# Static vars
#

my %missing;
my $system_release;
my $need = 0;
my $optional = 0;
my $need_symlink = 0;
my $need_sphinx = 0;
my $need_pip = 0;
my $need_virtualenv = 0;
my $rec_sphinx_upgrade = 0;
my $install = "";
my $virtenv_dir = "";
my $python_cmd = "";
my $activate_cmd;
my $min_version;
my $cur_version;
my $rec_version = "1.7.9";	# PDF won't build here
my $min_pdf_version = "2.4.4";	# Min version where pdf builds
my $latest_avail_ver;

#
# Command line arguments
#

my $pdf = 1;
my $virtualenv = 1;
my $version_check = 0;

#
# List of required texlive packages on Fedora and OpenSuse
#

my %texlive = (
	'amsfonts.sty'       => 'texlive-amsfonts',
	'amsmath.sty'        => 'texlive-amsmath',
	'amssymb.sty'        => 'texlive-amsfonts',
	'amsthm.sty'         => 'texlive-amscls',
	'anyfontsize.sty'    => 'texlive-anyfontsize',
	'atbegshi.sty'       => 'texlive-oberdiek',
	'bm.sty'             => 'texlive-tools',
	'capt-of.sty'        => 'texlive-capt-of',
	'cmap.sty'           => 'texlive-cmap',
	'ecrm1000.tfm'       => 'texlive-ec',
	'eqparbox.sty'       => 'texlive-eqparbox',
	'eu1enc.def'         => 'texlive-euenc',
	'fancybox.sty'       => 'texlive-fancybox',
	'fancyvrb.sty'       => 'texlive-fancyvrb',
	'float.sty'          => 'texlive-float',
	'fncychap.sty'       => 'texlive-fncychap',
	'footnote.sty'       => 'texlive-mdwtools',
	'framed.sty'         => 'texlive-framed',
	'luatex85.sty'       => 'texlive-luatex85',
	'multirow.sty'       => 'texlive-multirow',
	'needspace.sty'      => 'texlive-needspace',
	'palatino.sty'       => 'texlive-psnfss',
	'parskip.sty'        => 'texlive-parskip',
	'polyglossia.sty'    => 'texlive-polyglossia',
	'tabulary.sty'       => 'texlive-tabulary',
	'threeparttable.sty' => 'texlive-threeparttable',
	'titlesec.sty'       => 'texlive-titlesec',
	'ucs.sty'            => 'texlive-ucs',
	'upquote.sty'        => 'texlive-upquote',
	'wrapfig.sty'        => 'texlive-wrapfig',
);

#
# Subroutines that checks if a feature exists
#

sub check_missing(%)
{
	my %map = %{$_[0]};

	foreach my $prog (sort keys %missing) {
		my $is_optional = $missing{$prog};

		# At least on some LTS distros like CentOS 7, texlive doesn't
		# provide all packages we need. When such distros are
		# detected, we have to disable PDF output.
		#
		# So, we need to ignore the packages that distros would
		# need for LaTeX to work
		if ($is_optional == 2 && !$pdf) {
			$optional--;
			next;
		}

		if ($is_optional) {
			print "Warning: better to also install \"$prog\".\n";
		} else {
			print "ERROR: please install \"$prog\", otherwise, build won't work.\n";
		}
		if (defined($map{$prog})) {
			$install .= " " . $map{$prog};
		} else {
			$install .= " " . $prog;
		}
	}

	$install =~ s/^\s//;
}

sub add_package($$)
{
	my $package = shift;
	my $is_optional = shift;

	$missing{$package} = $is_optional;
	if ($is_optional) {
		$optional++;
	} else {
		$need++;
	}
}

sub check_missing_file($$$)
{
	my $files = shift;
	my $package = shift;
	my $is_optional = shift;

	for (@$files) {
		return if(-e $_);
	}

	add_package($package, $is_optional);
}

sub findprog($)
{
	foreach(split(/:/, $ENV{PATH})) {
		return "$_/$_[0]" if(-x "$_/$_[0]");
	}
}

sub find_python_no_venv()
{
	my $prog = shift;

	my $cur_dir = qx(pwd);
	$cur_dir =~ s/\s+$//;

	foreach my $dir (split(/:/, $ENV{PATH})) {
		next if ($dir =~ m,($cur_dir)/sphinx,);
		return "$dir/python3" if(-x "$dir/python3");
	}
	foreach my $dir (split(/:/, $ENV{PATH})) {
		next if ($dir =~ m,($cur_dir)/sphinx,);
		return "$dir/python" if(-x "$dir/python");
	}
	return "python";
}

sub check_program($$)
{
	my $prog = shift;
	my $is_opt