#!/usr/bin/perl -w
# -*- cperl -*-
#
# gtk-doc - GTK DocBook documentation generator.
# Copyright (C) 2007  David Nečas
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#

#############################################################################
# Script      : gtkdoc-check
# Description : Runs various checks on built documentation and outputs test
#                results. Can be run druring make check, by adding this to the
#                documentations Makefile.am: TESTS = $(GTKDOC_CHECK)
#############################################################################

use strict;
use Getopt::Long;

my $PRINT_VERSION;
my $PRINT_HELP;

my %optctl = ('version' => \$PRINT_VERSION,
              'help' => \$PRINT_HELP);
GetOptions(\%optctl, "version", "help");

if ($PRINT_VERSION) {
    print "1.19\n";
    exit 0;
}

if ($PRINT_HELP) {
    print <<EOF;
gtkdoc-check version 1.19 - run documentation unit tests

--version               Print the version of this program
--help                  Print this help
EOF
    exit 0;
}

my $checks = 4;

# Get parameters from test env, if not there try to grab them from the makefile
# We like Makefile.am more but builddir does not necessarily contain one.
my $makefile = (-f 'Makefile.am') ? 'Makefile.am' : 'Makefile';

# For historic reasons tests are launched in srcdir
my $SRCDIR = $ENV{"SRCDIR"};
my $BUILDDIR = $ENV{"BUILDDIR"};
my $dir = ".";
if (defined($BUILDDIR) and $BUILDDIR ne "") {
    $dir=$BUILDDIR;
}

# debug
#for my $key (sort(keys(%ENV))) { print "$key = ", $ENV{$key}, "\n"; }
# debug

my $DOC_MODULE = $ENV{"DOC_MODULE"};
if (!defined($DOC_MODULE) or $DOC_MODULE eq "") {
    $DOC_MODULE = &Grep('^\s*DOC_MODULE\s*=\s*(\S+)', $makefile, 'DOC_MODULE');
}
my $DOC_MAIN_SGML_FILE = $ENV{"DOC_MAIN_SGML_FILE"};
if (!defined($DOC_MAIN_SGML_FILE) or $DOC_MAIN_SGML_FILE eq "") {
    $DOC_MAIN_SGML_FILE = &Grep('^\s*DOC_MAIN_SGML_FILE\s*=\s*(\S+)', $makefile, 'DOC_MAIN_SGML_FILE');
    $DOC_MAIN_SGML_FILE =~ s/\$\(DOC_MODULE\)/$DOC_MODULE/;
}

print "Running suite(s): gtk-doc-$DOC_MODULE\n";

my $undocumented = int &Grep('^(\d+)\s+not\s+documented\.\s*$',
                             "$dir/$DOC_MODULE-undocumented.txt",
                             'number of undocumented symbols');
my $incomplete = int &Grep('^(\d+)\s+symbols?\s+incomplete\.\s*$',
                           "$dir/$DOC_MODULE-undocumented.txt",
                           'number of incomplete symbols');
my $total = $undocumented + $incomplete;
if ($total) {
    print "$DOC_MODULE-undocumented.txt:1:E: $total undocumented or incomplete symbols\n";
}

my $undeclared = &CheckEmpty("$dir/$DOC_MODULE-undeclared.txt",
                             'undeclared symbols');
my $unused = &CheckEmpty("$dir/$DOC_MODULE-unused.txt",
                         'unused documentation entries');

my $missing_includes = &CheckIncludes ("$dir/$DOC_MAIN_SGML_FILE");

my $failed = ($total > 0) + ($undeclared != 0) + ($unused != 0) + ($missing_includes != 0);
my $rate = 100.0*($checks - $failed)/$checks;
printf "%.1f%%: Checks %d, Failures: %d\n", $rate, $checks, $failed;
exit ($failed != 0);

sub Grep() {
    my ($regexp, $filename, $what) = @_;
    my $retval;

    if (not open GFILE, "<$filename") {
        die "Cannot open $filename: $!\n";
    }
    while (<GFILE>) {
        next if not m/$regexp/;
        $retval = $1;
        last;
    }
    close GFILE;
    if (not defined $retval) {
        die "Cannot find $what in $filename\n";
    }
    return $retval;
}

sub CheckEmpty() {
    my ($filename, $what) = @_;
    my $count = 0;

    if (not open GFILE, "<$filename") {
        return $count;
    }
    while (<GFILE>) {
        if (m/\S/) {
            $count++
        }
    }
    close GFILE;
    if ($count) {
        print "$filename:1:E: $count $what\n"
    }
    return $count;
}

sub CheckIncludes() {
    my ($main_sgml_file) = @_;

    if (not open GFILE, "<$main_sgml_file") {
        die "Cannot open $main_sgml_file: $!\n";
    }

    # Check that each of the XML files in the xml directory are included in $DOC_MAIN_SGML_FILE
    my @xml_files = <xml/*.xml>;
    my $num_missing = 0;

    foreach my $xml_file (@xml_files) {
        my $regex = quotemeta ($xml_file);
        my $found = 0;

        while (<GFILE>) {
            next if not m/"$regex"/;
            $found = 1;
            last;
        }

        if (!$found) {
            $num_missing++;
            print "$main_sgml_file doesn't appear to include \"$xml_file\"\n";
        }

        seek (GFILE, 0, 0);
    }

    close (GFILE);

    return $num_missing;
}
