#!/usr/bin/env perl
#
#   Copyright (c) International Business Machines  Corp., 2002
#
#   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, see
#   <http://www.gnu.org/licenses/>.
#
#
# gendesc
#
#   This script creates a description file as understood by genhtml.
#   Input file format:
#
#   For each test case:
#     <test name><optional whitespace>
#     <at least one whitespace character (blank/tab)><test description>
#
#   Actual description may consist of several lines. By default, output is
#   written to stdout. Test names consist of alphanumeric characters
#   including _ and -.
#
#
# History:
#   2002-09-02: created by Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com>
#

use strict;
use warnings;
use File::Basename;
use Getopt::Long;
use Cwd qw/abs_path/;

use lib "/usr/lib/lcov";
use lcovutil qw ($tool_name $tool_dir $lcov_version $lcov_url
                 die_handler warn_handler);

# Constants
# (now imported from lcovutil.pm)

# Prototypes
sub print_usage(*);
sub gen_desc();

# Global variables
our $help;
our $version;
our $output_filename;
our $input_filename;

#
# Code entry point
#

$SIG{__WARN__} = \&warn_handler;
$SIG{__DIE__}  = \&die_handler;

# Parse command line options
if (!GetOptions("output-filename=s" => \$output_filename,
                "version"           => \$version,
                "help|?"            => \$help
)) {
    print(STDERR "Use $tool_name --help to get usage information\n");
    exit(1);
}

$input_filename = $ARGV[0];

# Check for help option
if ($help) {
    print_usage(*STDOUT);
    exit(0);
}

# Check for version option
if ($version) {
    print("$tool_name: $lcov_version\n");
    exit(0);
}

# Check for input filename
if (!$input_filename) {
    die("No input filename specified\n" .
        "Use $tool_name --help to get usage information\n");
}

# Do something
gen_desc();

#
# print_usage(handle)
#
# Write out command line usage information to given filehandle.
#

sub print_usage(*)
{
    local *HANDLE = $_[0];

    print(HANDLE <<END_OF_USAGE)
Usage: $tool_name [OPTIONS] INPUTFILE

Convert a test case description file into a format as understood by genhtml.

OPTIONS
  -h, --help                        Print this help, then exit
      --version                     Print version number, then exit
  -o, --output-filename FILENAME    Write description to FILENAME

For more information see the gendesc man page.
END_OF_USAGE
        ;
}

#
# gen_desc()
#
# Read text file INPUT_FILENAME and convert the contained description to a
# format as understood by genhtml, i.e.
#
#    TN:<test name>
#    TD:<test description>
#
# If defined, write output to OUTPUT_FILENAME, otherwise to stdout.
#
# Die on error.
#

sub gen_desc()
{
    local *INPUT_HANDLE;
    local *OUTPUT_HANDLE;
    my $empty_line = "ignore";

    open(INPUT_HANDLE, "<", $input_filename) or
        die("cannot open $input_filename!\n");

    # Open output file for writing
    if ($output_filename) {
        open(OUTPUT_HANDLE, ">", $output_filename) or
            die("cannot create $output_filename!\n");
    } else {
        *OUTPUT_HANDLE = *STDOUT;
    }

    # Process all lines in input file
    while (<INPUT_HANDLE>) {
        chomp($_);

        if (/^(\w[\w-]*)\s*$/) {
            # Matched test name
            # Name starts with alphanum or _, continues with
            # alphanum, _ or -
            print(OUTPUT_HANDLE "TN: $1\n");
            $empty_line = "ignore";
        } elsif (/^(\s+)(\S.*?)\s*$/) {
            # Matched test description
            if ($empty_line eq "insert") {
                # Write preserved empty line
                print(OUTPUT_HANDLE "TD: \n");
            }
            print(OUTPUT_HANDLE "TD: $2\n");
            $empty_line = "observe";
        } elsif (/^\s*$/) {
            # Matched empty line to preserve paragraph separation
            # inside description text
            if ($empty_line eq "observe") {
                $empty_line = "insert";
            }
        }
    }

    # Close output file if defined
    if ($output_filename) {
        close(OUTPUT_HANDLE);
    }

    close(INPUT_HANDLE);
}
