source: main/trunk/greenstone2/bin/script/gti.pl@ 30548

#!/usr/bin/perl -w

###########################################################################
#
# gti.pl
#
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 2005 New Zealand Digital Library Project
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################


BEGIN {
    die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
    unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
}


use iso639;
use strict;
use util;
use FileUtils;

my $gsdl_root_directory = "$ENV{'GSDLHOME'}";
my $gti_log_file = &util::filename_cat($gsdl_root_directory, "etc", "gti.log");
my $source_language_code = "en";  # This is non-negotiable

my $gti_translation_files =
[ # Greenstone macrofiles
{ 'key' => "coredm",
    'file_type' => "macrofile",
    'source_file' => "macros/english.dm",
    'target_file' => "macros/{bn:bengali;fa:farsi;gd:gaelic;id:indo;lv:latvian;pt-br:port-br;pt-pt:port-pt;zh-tr:chinese-trad;iso_639_1_target_language_name}.dm" },

{ 'key' => "auxdm",
    'file_type' => "macrofile",
    'source_file' => "macros/english2.dm",
    'target_file' => "macros/{bn:bengali;fa:farsi;gd:gaelic;id:indo;lv:latvian;pt-br:port-br;pt-pt:port-pt;zh-tr:chinese-trad;iso_639_1_target_language_name}2.dm" },

#{ 'key' => "paperspastdm",
#   'file_type' => "macrofile",
#   'source_file' => "macros/paperspast-english.dm",
#   'target_file' => "macros/paperspast-{bn:bengali;fa:farsi;gd:gaelic;id:indo;lv:latvian;pt-br:port-br;pt-pt:port-pt;zh-tr:chinese-trad;iso_639_1_target_language_name}.dm" },

# GLI dictionary
{ 'key' => "glidict",
    'file_type' => "resource_bundle",
    'source_file' => "gli/classes/dictionary.properties",
    'target_file' => "gli/classes/dictionary_{target_language_code}.properties" },

# GLI help
{ 'key' => "glihelp",
    'file_type' => "greenstone_xml",
    'source_file' => "gli/help/en/help.xml",
    'target_file' => "gli/help/{target_language_code}/help.xml" },

# Greenstone Perl modules
{ 'key' => "perlmodules",
    'file_type' => "resource_bundle",
    'source_file' => "perllib/strings.properties",
    'target_file' => "perllib/strings_{target_language_code}.properties" },

# Greenstone Installer interface
{ 'key' => "gsinstaller",
    'file_type' => "resource_bundle",
    'source_file' => "gsinstaller/LanguagePack.properties",
    'target_file' => "gsinstaller/LanguagePack_{target_language_code}.properties" },

# Greenstone tutorial exercises
# { 'key' => "tutorials",
# 'file_type' => "greenstone_xml",
# 'source_file' => "gsdl-documentation/tutorials/xml-source/tutorial_en.xml",
# 'target_file' => "gsdl-documentation/tutorials/xml-source/tutorial_{target_language_code}.xml" },

# new Greenstone.org
{ 'key' => "greenorg",
    'file_type' => "resource_bundle",
    'source_file' => "greenstoneorg/website/classes/Gsc.properties",
    'target_file' => "greenstoneorg/website/classes/Gsc_{target_language_code}.properties" 
},

# greenstone 3 interface files, from http://svn.greenstone.org/main/trunk/greenstone3/web/WEB-INF/classes
# check it out as greenstone3
{ 'key' => "gs3interface",
        'file_type' => "resource_bundle",
        'source_file' => "greenstone3",
        'target_file' => "greenstone3"
}
];

my @gs3_interface_files = ("interface_default", "ServiceRack", "metadata_names");
#"AbstractBrowse", "AbstractGS2FieldSearch", "AbstractSearch", "AbstractTextSearch", "Authentication", "CrossCollectionSearch", "GS2LuceneSearch", "LuceneSearch", "MapRetrieve", "MapSearch", "PhindPhraseBrowse", "SharedSoleneGS2FieldSearch");

# Auxilliary GS3 interface files. This list is not used at present
# Combine with above list if generating translation spreadsheet for all interface files
my @gs3_aux_interface_files = ("GATEServices","QBRWebServicesHelp", "Visualizer", "IViaSearch", "GS2Construct");

my @gs3_other_interface_files = ("interface_default2", "interface_basic", "interface_basic2", "interface_nzdl", "interface_gs2");

# Not: i18n, log4j

sub main
{
    # Get the command to process, and any arguments
    my $gti_command = shift(@_);
    my @gti_command_arguments = @_;
    my $module = $_[1];

    # for GS3, set gsdl_root_dir to GSDL3HOME
    #if($module && $module eq "gs3interface"){ # module is empty when the gti-command is create-glihelp-zip-file
    #if($ENV{'GSDL3SRCHOME'}) {
     #   $gsdl_root_directory = (defined $ENV{'GSDL3HOME'}) ? $ENV{'GSDL3HOME'} : &util::filename_cat($ENV{'GSDL3SRCHOME'}, "web");
     #   $gti_log_file = &util::filename_cat($gsdl_root_directory, "logs", "gti.log");
    #}
    #}
    
    # Open the GTI log file for appending, or write to STDERR if that fails
    if (!open(GTI_LOG, ">>$gti_log_file")) {
        open(GTI_LOG, ">&STDERR");
    }
    
    # Log the command that launched this script
    &log_message("Command: $0 @ARGV");
    
    # Check that a command was supplied
    if (!$gti_command) {
        &throw_fatal_error("Missing command.");
    }      
    
    # Process the command
    if ($gti_command =~ /^get-all-chunks$/i) {
        # Check that GS3 interface is the target
        if ($module eq "gs3interface") {
            print &get_all_chunks_for_gs3(@gti_command_arguments);
        } else {
            print &get_all_chunks(@gti_command_arguments);
        }
    }
    elsif ($gti_command =~ /^get-first-n-chunks-requiring-work$/i) {
        if ($module eq "gs3interface") {       
            print &get_first_n_chunks_requiring_work_for_gs3(@gti_command_arguments);
        } else {
            print &get_first_n_chunks_requiring_work(@gti_command_arguments);
        }
    }
    elsif ($gti_command =~ /^get-uptodate-chunks$/i) {
        if ($module eq "gs3interface") {       
            print &get_uptodate_chunks_for_gs3(@gti_command_arguments);
        } else {
            print &get_uptodate_chunks(@gti_command_arguments);
        }
    }
    elsif ($gti_command =~ /^get-language-status$/i) {
        print &get_language_status(@gti_command_arguments);       
    }
    elsif ($gti_command =~ /^search-chunks$/i) {
        print &search_chunks(@gti_command_arguments);
    }
    elsif ($gti_command =~ /^submit-translations$/i) {
        # This command cannot produce any output since it reads input
        &submit_translations(@gti_command_arguments);
    }
    elsif ($gti_command =~ /^create-glihelp-zip-file$/i) {
        # This command cannot produce any output since it reads input
        &create_glihelp_zip_file(@gti_command_arguments);
    }
    else {
        # The command was not recognized
        &throw_fatal_error("Unknown command \"$gti_command\".");
    }
}


sub throw_fatal_error
{
    my $error_message = shift(@_);
    
    # Write an XML error response
    print "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
    print "<GTIResponse>\n";
    print "  <GTIError time=\"" . time() . "\">" . $error_message . "</GTIError>\n";
    print "</GTIResponse>\n";
    
    # Log the error message, then die
    &log_message("Error: $error_message");
    die "\n";
}


sub log_message
{
    my $log_message = shift(@_);
    print GTI_LOG time() . " -- " . $log_message . "\n";
}


sub get_all_chunks
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key) {
        &throw_fatal_error("Missing command argument.");
    }
    
    # Get (and check) the translation configuration
    my ($source_file, $target_file, $translation_file_type)
    = &get_translation_configuration($target_language_code, $translation_file_key);
    
    # Parse the source language and target language files
    my $source_file_path = &util::filename_cat($gsdl_root_directory, $source_file);
    my @source_file_lines = &read_file_lines($source_file_path);
    my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
    
    my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
    my @target_file_lines = &read_file_lines($target_file_path);
    my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
    
    # Filter out any automatically translated chunks
    foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
        if (&is_chunk_automatically_translated($chunk_key, $translation_file_type)) {
            delete $source_file_key_to_line_mapping{$chunk_key};
            delete $target_file_key_to_line_mapping{$chunk_key};
        }
    }
    
    my %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
    my %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
    &log_message("Number of source chunks: " . scalar(keys(%source_file_key_to_text_mapping)));
    &log_message("Number of target chunks: " . scalar(keys(%target_file_key_to_text_mapping)));
    
    my %source_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($source_file, \@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
    my %target_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($target_file, \@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
    
    my $xml_response = &create_xml_response_for_all_chunks($translation_file_key, $target_file, \%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping, \%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping);   
    
    return $xml_response;
}


sub get_uptodate_chunks
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key) {
        &throw_fatal_error("Missing command argument.");
    }
    
    # Get (and check) the translation configuration
    my ($source_file, $target_file, $translation_file_type)
    = &get_translation_configuration($target_language_code, $translation_file_key);
    
    # Parse the source language and target language files
    my $source_file_path = &util::filename_cat($gsdl_root_directory, $source_file);
    my @source_file_lines = &read_file_lines($source_file_path);
    my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
    
    my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
    my @target_file_lines = &read_file_lines($target_file_path);
    my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
    
    # Filter out any automatically translated chunks
    foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
        if (&is_chunk_automatically_translated($chunk_key, $translation_file_type)) {
            delete $source_file_key_to_line_mapping{$chunk_key};
            delete $target_file_key_to_line_mapping{$chunk_key};
        }
    }
    
    my %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
    my %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
    &log_message("Number of source chunks: " . scalar(keys(%source_file_key_to_text_mapping)));
    &log_message("Number of target chunks: " . scalar(keys(%target_file_key_to_text_mapping)));
    
    my %source_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($source_file, \@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
    my %target_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($target_file, \@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type); 
  

    # Chunks needing updating are those in the target file that have been more recently edited in the source file
    # All others are uptodate (which implies that they have certainly been translated at some point and would not be empty)
    my @uptodate_target_file_keys = ();
    foreach my $chunk_key (keys(%source_file_key_to_last_update_date_mapping)) {
        my $source_chunk_last_update_date = $source_file_key_to_last_update_date_mapping{$chunk_key};
        my $target_chunk_last_update_date = $target_file_key_to_last_update_date_mapping{$chunk_key};
        
        # print "key: $chunk_key\nsource date : $source_chunk_last_update_date\ntarget date : $target_chunk_last_update_date\nafter? ". &is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date) . "\n\n";        
        
        if (defined($target_chunk_last_update_date) && !&is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date)) {
            # &log_message("Chunk with key $chunk_key needs updating.");
            push(@uptodate_target_file_keys, $chunk_key);
        }
    }

    my $xml_response = &create_xml_response_for_uptodate_chunks($translation_file_key, $target_file, \@uptodate_target_file_keys, \%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping, \%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping);   

    return $xml_response;
}


sub get_first_n_chunks_requiring_work
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    # The number of chunks to return (defaults to one if not specified)
    my $num_chunks_to_return = shift(@_) || "1";
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key) {
        &throw_fatal_error("Missing command argument.");
    }
    
    # Get (and check) the translation configuration
    my ($source_file, $target_file, $translation_file_type)
    = &get_translation_configuration($target_language_code, $translation_file_key);

    # Parse the source language and target language files
    my $source_file_path = &util::filename_cat($gsdl_root_directory, $source_file);
    my @source_file_lines = &read_file_lines($source_file_path);
    my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
    
    my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
    my @target_file_lines = &read_file_lines($target_file_path);
    my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
    
    # Filter out any automatically translated chunks
    foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
        if (&is_chunk_automatically_translated($chunk_key, $translation_file_type)) {
            delete $source_file_key_to_line_mapping{$chunk_key};
            delete $target_file_key_to_line_mapping{$chunk_key};
        }
    }
    
    my %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
    my %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
    &log_message("Number of source chunks: " . scalar(keys(%source_file_key_to_text_mapping)));
    &log_message("Number of target chunks: " . scalar(keys(%target_file_key_to_text_mapping)));
    
    # Determine the target file chunks requiring translation
    my @target_file_keys_requiring_translation = &determine_chunks_requiring_translation(\%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping);
    &log_message("Number of target chunks requiring translation: " . scalar(@target_file_keys_requiring_translation));
    
    # Determine the target file chunks requiring updating
    my %source_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($source_file, \@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
    my %target_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($target_file, \@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
    my @target_file_keys_requiring_updating = &determine_chunks_requiring_updating(\%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping);
    &log_message("Number of target chunks requiring updating: " . scalar(@target_file_keys_requiring_updating));
    
    my $xml_response = &create_xml_response_for_chunks_requiring_work($translation_file_key, $target_file, scalar(keys(%source_file_key_to_text_mapping)), \@target_file_keys_requiring_translation, \@target_file_keys_requiring_updating, $num_chunks_to_return, \%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping, \%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping);   
    
    return $xml_response;
}


sub get_language_status
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code) {
        &throw_fatal_error("Missing command argument.");
    }
    
    # Form an XML response to the command
    my $xml_response = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
    $xml_response .= "<GTIResponse>\n";
    $xml_response .= "  <LanguageStatus code=\"$target_language_code\">\n";
    
    foreach my $translation_file (@$gti_translation_files) {    
        my ($num_source_chunks, $num_target_chunks, $num_chunks_requiring_translation, $num_chunks_requiring_updating) = 0;
        my $target_file_name = "";
        
        if ($translation_file->{'key'} eq "gs3interface") {
            my (%source_file_key_to_text_mapping, %target_file_key_to_text_mapping, %source_file_key_to_last_update_date_mapping, %target_file_key_to_last_update_date_mapping ) = ();
            &build_gs3_configuration($target_language_code, \%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping, \%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping );    
            
            my @target_file_keys_requiring_translation = &determine_chunks_requiring_translation(\%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping);     
            my @target_file_keys_requiring_updating = &determine_chunks_requiring_updating(\%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping);
            
            $num_source_chunks = scalar(keys(%source_file_key_to_text_mapping));
            $num_target_chunks = scalar(keys(%target_file_key_to_text_mapping));
            $num_chunks_requiring_translation = scalar(@target_file_keys_requiring_translation);
            $num_chunks_requiring_updating = scalar(@target_file_keys_requiring_updating);
        }
        else {
            # Get (and check) the translation configuration
            my ($source_file, $target_file, $translation_file_type) = &get_translation_configuration($target_language_code, $translation_file->{'key'});
            $target_file_name = $target_file;
            
            # Parse the source language and target language files
            my $source_file_path = &util::filename_cat($gsdl_root_directory, $source_file);
            my @source_file_lines = &read_file_lines($source_file_path);
            my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
            
            my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
            my @target_file_lines = &read_file_lines($target_file_path);
            my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
            
            # Filter out any automatically translated chunks
            foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
                if (&is_chunk_automatically_translated($chunk_key, $translation_file_type)) {
                    delete $source_file_key_to_line_mapping{$chunk_key};
                    delete $target_file_key_to_line_mapping{$chunk_key};
                }
            }
            
            my %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
            my %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
            
            # Determine the target file chunks requiring translation
            my @target_file_keys_requiring_translation = &determine_chunks_requiring_translation(\%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping);     
            
            # Determine the target file chunks requiring updating
            my @target_file_keys_requiring_updating = ();
            if (-e $target_file_path) {
                my %source_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($source_file, \@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
                my %target_file_key_to_last_update_date_mapping = &build_key_to_last_update_date_mapping($target_file, \@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
                @target_file_keys_requiring_updating = &determine_chunks_requiring_updating(\%source_file_key_to_last_update_date_mapping, \%target_file_key_to_last_update_date_mapping);      
            }
            
            $num_source_chunks = scalar(keys(%source_file_key_to_text_mapping));
            $num_target_chunks = scalar(keys(%target_file_key_to_text_mapping));
            $num_chunks_requiring_translation = scalar(@target_file_keys_requiring_translation);
            $num_chunks_requiring_updating = scalar(@target_file_keys_requiring_updating);
        }
        
        &log_message("Status of " . $translation_file->{'key'});
        &log_message("Number of source chunks: " . $num_source_chunks);
        &log_message("Number of target chunks: " . $num_target_chunks);
        &log_message("Number of target chunks requiring translation: " . $num_chunks_requiring_translation);
        &log_message("Number of target chunks requiring updating: " . $num_chunks_requiring_updating);
        
        $xml_response .= "    <TranslationFile"
        . " key=\"" . $translation_file->{'key'} . "\""
        . " target_file_path=\"" . $target_file_name . "\""
        . " num_chunks_translated=\"" . ($num_source_chunks - $num_chunks_requiring_translation) . "\""
        . " num_chunks_requiring_translation=\"" . $num_chunks_requiring_translation . "\""
        . " num_chunks_requiring_updating=\"" . $num_chunks_requiring_updating . "\"\/>\n";
    }
    
    $xml_response .= "  </LanguageStatus>\n";
    
    $xml_response .= "</GTIResponse>\n";
    return $xml_response;
}


sub search_chunks
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    # The query string
    my $query_string = join(' ', @_);
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key || !$query_string) {
        &throw_fatal_error("Missing command argument.");
    }
    
    my ($source_file, $target_file, $translation_file_type) = ();
    my %source_file_key_to_text_mapping = ();
    my %target_file_key_to_text_mapping = ();
    
    
    if ($translation_file_key ne "gs3interface") {
        # Get (and check) the translation configuration
        ($source_file, $target_file, $translation_file_type) = &get_translation_configuration($target_language_code, $translation_file_key);
        
        # Parse the source language and target language files
        my $source_file_path = &util::filename_cat($gsdl_root_directory, $source_file);
        my @source_file_lines = &read_file_lines($source_file_path);
        my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
        
        my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
        my @target_file_lines = &read_file_lines($target_file_path);
        my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
        
        # Filter out any automatically translated chunks
        foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
            if (&is_chunk_automatically_translated($chunk_key, $translation_file_type)) {
                delete $source_file_key_to_line_mapping{$chunk_key};
                delete $target_file_key_to_line_mapping{$chunk_key};
            }
        }
        
        %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
        %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
    }
    else {
        # Not needed in this case
        my (%source_file_key_to_gti_command_mapping, %target_file_key_to_gti_command_mapping) = ();
        &build_gs3_configuration($target_language_code, \%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping,
        \%source_file_key_to_gti_command_mapping, \%target_file_key_to_gti_command_mapping, 1);
    }
    
    &log_message("Number of source chunks: " . scalar(keys(%source_file_key_to_text_mapping)));
    &log_message("Number of target chunks: " . scalar(keys(%target_file_key_to_text_mapping)));
    
    # Determine the target file chunks matching the query
    my @target_file_keys_matching_query = ();
    foreach my $chunk_key (keys(%target_file_key_to_text_mapping)) {
        my $target_file_text = $target_file_key_to_text_mapping{$chunk_key};
        if ($target_file_text =~ /$query_string/i) {
            # &log_message("Chunk with key $chunk_key matches query.");
            push(@target_file_keys_matching_query, $chunk_key);
        }
    }
    
    # Form an XML response to the command
    my $xml_response = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
    $xml_response .= "<GTIResponse>\n";
    
    $xml_response .= "  <ChunksMatchingQuery size=\"" . scalar(@target_file_keys_matching_query) . "\">\n";
    foreach my $chunk_key (@target_file_keys_matching_query) {
        my $target_file_chunk_text = &make_text_xml_safe($target_file_key_to_text_mapping{$chunk_key});
        
        $xml_response .= "    <Chunk key=\"$chunk_key\">\n";
        $xml_response .= "      <TargetFileText>$target_file_chunk_text</TargetFileText>\n";
        $xml_response .= "    </Chunk>\n";
    }
    $xml_response .= "  </ChunksMatchingQuery>\n";
    
    $xml_response .= "</GTIResponse>\n";
    return $xml_response;
}


sub submit_translations
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    # The username of the translation submitter
    my $submitter_username = shift(@_);
    # Whether to submit a target chunk even if it hasn't changed
    my $force_submission_flag = shift(@_);
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key || !$submitter_username) {
        &log_message("Fatal error (but cannot be thrown): Missing command argument.");
        die "\n";
    }
    
    my %source_file_key_to_text_mapping = ();
    my %source_file_key_to_gti_comment_mapping = ();
    my %target_file_key_to_text_mapping = ();
    my %target_file_key_to_gti_comment_mapping = ();
    
    my (@source_file_lines, @target_file_lines) = ();
    my ($source_file, $target_file, $translation_file_type);
    
    
    if ($translation_file_key ne "gs3interface") {
        # Get (and check) the translation configuration
        ($source_file, $target_file, $translation_file_type)
        = &get_translation_configuration($target_language_code, $translation_file_key);
        
        # Parse the source language and target language files
        @source_file_lines = &read_file_lines(&util::filename_cat($gsdl_root_directory, $source_file));
        my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
        %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
        %source_file_key_to_gti_comment_mapping = &build_key_to_gti_comment_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);    
        
        @target_file_lines = &read_file_lines(&util::filename_cat($gsdl_root_directory, $target_file));
        my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
        %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
        %target_file_key_to_gti_comment_mapping = &build_key_to_gti_comment_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);    
    } 
    else {
        &build_gs3_configuration($target_language_code, \%source_file_key_to_text_mapping, \%target_file_key_to_text_mapping, 
        \%source_file_key_to_gti_comment_mapping, \%target_file_key_to_gti_comment_mapping, 1);
    }
    &log_message("Number of source chunks: " . scalar(keys(%source_file_key_to_text_mapping)));
    &log_message("Number of target chunks: " . scalar(keys(%target_file_key_to_text_mapping)));
    
    # Submission date
    my $day = (localtime)[3];
    my $month = ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec")[(localtime)[4]];
    my $year = (localtime)[5] + 1900;
    my $submission_date = "$day-$month-$year";
    
    open(SUBMISSION, "-");
    my @submission_lines = <SUBMISSION>;
    close(SUBMISSION);
    
    # Remove any nasty carriage returns
    # &log_message("Submission:");
    foreach my $submission_line (@submission_lines) {
        $submission_line =~ s/\r$//;
        #&log_message("  $submission_line");
    }
    
    my %source_file_key_to_submission_mapping = ();
    my %target_file_key_to_submission_mapping = ();
    for (my $i = 0; $i < scalar(@submission_lines); $i++) {
        # Read source file part of submission
        if ($submission_lines[$i] =~ /^\<SourceFileText key=\"(.+)\"\>/) {
            my $chunk_key = $1;
            
            # Read the source file text
            my $source_file_chunk_text = "";
            $i++;
            while ($i < scalar(@submission_lines) && $submission_lines[$i] !~ /^\<\/SourceFileText\>/) {
                $source_file_chunk_text .= $submission_lines[$i];
                $i++;
            }
            $source_file_chunk_text =~ s/\n$//;  # Strip the extra newline character added
            $source_file_chunk_text = &unmake_text_xml_safe($source_file_chunk_text);
            
            #&log_message("Source file key: $chunk_key");
            #&log_message("Source file text: $source_file_chunk_text");
            $source_file_key_to_submission_mapping{$chunk_key} = $source_file_chunk_text;
        }
        
        # Read target file part of submission
        if ($submission_lines[$i] =~ /^\<TargetFileText key=\"(.+)\"\>/) {
            my $chunk_key = $1;
            
            # Read the target file text
            my $target_file_chunk_text = "";
            $i++;
            while ($i < scalar(@submission_lines) && $submission_lines[$i] !~ /^\<\/TargetFileText\>/) {
                $target_file_chunk_text .= $submission_lines[$i];
                $i++;
            }
            $target_file_chunk_text =~ s/\n$//;  # Strip the extra newline character added
            $target_file_chunk_text = &unmake_text_xml_safe($target_file_chunk_text);
            
            #&log_message("Target file key: $chunk_key");
            #&log_message("Target file text: $target_file_chunk_text");
            $target_file_key_to_submission_mapping{$chunk_key} = $target_file_chunk_text;
        }
    }
    
    # -----------------------------------------
    #   Validate the translation submissions
    # -----------------------------------------
    
    # Check that the translations are valid
    foreach my $chunk_key (keys(%source_file_key_to_submission_mapping)) {
        # Make sure the submitted chunk still exists in the source file
        if (!defined($source_file_key_to_text_mapping{$chunk_key})) {
            &log_message("Warning: Source chunk $chunk_key no longer exists (ignoring submission).");
            delete $source_file_key_to_submission_mapping{$chunk_key};
            delete $target_file_key_to_submission_mapping{$chunk_key};
            next;
        }
        
        # Make sure the submitted source chunk matches the source file chunk
        if ($source_file_key_to_submission_mapping{$chunk_key} ne &unmake_text_xml_safe($source_file_key_to_text_mapping{$chunk_key})) {
        #if (&unmake_text_xml_safe($source_file_key_to_submission_mapping{$chunk_key}) ne &unmake_text_xml_safe($source_file_key_to_text_mapping{$chunk_key})) {
                    #print STDERR "**** $source_file_key_to_submission_mapping{$chunk_key}\n";
                #print STDERR "**** " . &unmake_text_xml_safe($source_file_key_to_text_mapping{$chunk_key}) ."\n";

            &log_message("Warning: Source chunk $chunk_key has changed (ignoring submission).");
            &log_message("Submission source: $source_file_key_to_submission_mapping{$chunk_key}");
            &log_message("      Source text: $source_file_key_to_text_mapping{$chunk_key}");
            delete $source_file_key_to_submission_mapping{$chunk_key};
            delete $target_file_key_to_submission_mapping{$chunk_key};
            next;
        }
    }
    
    # Apply the submitted translations
    foreach my $chunk_key (keys(%target_file_key_to_submission_mapping)) {
        # Only apply the submission if it is a change, unless -force_submission has been specified
        if ($force_submission_flag || !defined($target_file_key_to_text_mapping{$chunk_key}) || $target_file_key_to_submission_mapping{$chunk_key} ne $target_file_key_to_text_mapping{$chunk_key}) {
            $target_file_key_to_text_mapping{$chunk_key} = $target_file_key_to_submission_mapping{$chunk_key};
            $target_file_key_to_gti_comment_mapping{$chunk_key} = "Updated $submission_date by $submitter_username";
        }
    }
    
    if ($translation_file_key ne "gs3interface") {
        eval "&write_translated_${translation_file_type}(\$source_file, \\\@source_file_lines, \\\%source_file_key_to_text_mapping, \$target_file, \\\@target_file_lines, \\\%target_file_key_to_text_mapping, \\\%target_file_key_to_gti_comment_mapping, \$target_language_code)";
    } else {
        eval "&write_translated_gs3interface(\\\%source_file_key_to_text_mapping, \\\%target_file_key_to_text_mapping, \\\%target_file_key_to_gti_comment_mapping, \$target_language_code)";
    }
}


sub create_glihelp_zip_file
{
    my $target_language_code = shift(@_);
    my $translation_file_key = "glihelp";
    
    &log_message("Creating GLI Help zip file for $target_language_code");
    
    my ($source_file, $target_file, $translation_file_type) = &get_translation_data_for($target_language_code, $translation_file_key);    
    
    my $classpath = &util::filename_cat($gsdl_root_directory, "gti-lib");
    my $oldclasspath = $classpath;
    if ( ! -e $classpath) {
    $classpath = &util::filename_cat($gsdl_root_directory, "gli", "shared");
    }
    if ( ! -e $classpath) {
        &throw_fatal_error("$classpath doesn't exist! (Neither does $oldclasspath.) Need the files in this directory (ApplyXLST and its related files) to create the zip file for GLI Help");
    }

    
    my $perllib_path = &util::filename_cat($gsdl_root_directory, "perllib"); # strings.properties
    my $gliclasses_path = &util::filename_cat($gsdl_root_directory, "gli", "classes"); # dictionary.properties
    my $os = $^O;
    my $path_separator = ($^O =~ m/mswin/i) ? ";" : ":";
    my $xalan_path = &util::filename_cat($classpath, "xalan.jar");
    $classpath = "$perllib_path$path_separator$gliclasses_path$path_separator$classpath$path_separator$xalan_path";

    my $gli_help_directory = &util::filename_cat($gsdl_root_directory, "gli");
    $gli_help_directory = &util::filename_cat($gli_help_directory, "help");
    
    my $gen_many_html_xsl_filepath = &util::filename_cat($gli_help_directory, "gen-many-html.xsl");
    if ( ! -e $gen_many_html_xsl_filepath) {
        &throw_fatal_error("$gen_many_html_xsl_filepath doesn't exist! Need this file to create the zip file for GLI Help");
    }
    
    my $gen_index_xml_xsl_filepath = &util::filename_cat($gli_help_directory, "gen-index-xml.xsl");   
    my $split_script_filepath = &util::filename_cat($gli_help_directory, "splithelpdocument.pl");   
    
    my $target_file_directory = &util::filename_cat($gli_help_directory, $target_language_code);
    $target_file_directory = $target_file_directory."/";
    
    my $target_filepath = &util::filename_cat($gsdl_root_directory, $target_file);

    # if gli/help/nl doesn't exist, create it by copying over gli/help/en/help.xml, then process the copied file
    my ($tailname, $glihelp_lang_dir, $suffix) =  &File::Basename::fileparse($target_filepath, "\\.[^\\.]+\$");    
    if(!&FileUtils::directoryExists($glihelp_lang_dir)) { 

    # copy across the gli/help/en/help.xml into a new folder for the new language gli/help/<newlang>
    my $en_glihelp_dir = &util::filename_cat($gli_help_directory, "en");
    my $en_helpxml_file = &util::filename_cat($en_glihelp_dir, "$tailname$suffix"); #$tailname$suffix="help.xml"
    &FileUtils::copyFilesRecursiveNoSVN($en_helpxml_file, $glihelp_lang_dir);

    # In gli/help/<newlang>/help.xml, replace all occurrences of 
    # <Text id="1">This text in en will be removed for new langcode</Text> 
    # with <!-- Missing translation: 1 --> 
    open(FIN,"<$target_filepath") or &throw_fatal_error("Could not open $target_filepath for READING after creating it");
    my $help_xml_contents;
    # Read in the entire contents of the file in one hit
    sysread(FIN, $help_xml_contents, -s FIN);
    close(FIN); 
    
    $help_xml_contents =~ s@<Text id="([^"]+?)">(.*?)</Text>@<!-- Missing translation: $1 -->@sg;

    open(FOUT, ">$target_filepath") or &throw_fatal_error("Could not open $target_filepath for WRITING after creating it");
    print FOUT $help_xml_contents;
    close(FOUT);
    }

    my $perl_exec = &util::get_perl_exec();
    my $java_exec = "java";
    if(defined($ENV{'JAVA_HOME'}) && $ENV{'JAVA_HOME'} ne ""){
        $java_exec = &util::filename_cat($ENV{'JAVA_HOME'}, "bin", "java");
    }

    #my $cmd = "$java_exec -cp $classpath:$classpath/xalan.jar ApplyXSLT $target_language_code $gen_many_html_xsl_filepath $target_filepath | \"$perl_exec\" -S $split_script_filepath $target_file_directory";
    my $cmd = "$java_exec -DGSDLHOME=$gsdl_root_directory -cp $classpath ApplyXSLT $target_language_code $gen_many_html_xsl_filepath $target_filepath | \"$perl_exec\" -S $split_script_filepath $target_file_directory";
    #&throw_fatal_error("RAN gti command: $cmd");
    my $response = `$cmd`;

    #$cmd = "$java_exec -cp $classpath:$classpath/xalan.jar ApplyXSLT $target_language_code $gen_index_xml_xsl_filepath $target_filepath > " . $target_file_directory . "help_index.xml"; # 2>/dev/null";
    $cmd = "$java_exec -cp $classpath -DGSDLHOME=$gsdl_root_directory ApplyXSLT $target_language_code $gen_index_xml_xsl_filepath $target_filepath > " . $target_file_directory . "help_index.xml"; # 2>/dev/null";
    $response = `$cmd`;

    # create a gti/tmp folder, if one doesn't already exist, and store the downloadable zip file in there
    my $tmpdir = &util::filename_cat($gsdl_root_directory, "tmp");
    if(!&FileUtils::directoryExists($tmpdir)) {
    &FileUtils::makeDirectory($tmpdir);
    }
    #my $zip_file_path = "/greenstone/custom/gti/" . $target_language_code . "_GLIHelp.zip";    
    my $zip_file_path = &util::filename_cat($tmpdir, $target_language_code . "_GLIHelp.zip");
    $cmd = "zip -rj $zip_file_path $target_file_directory -i \*.htm \*.xml";

    $response = `$cmd`;
}


sub get_translation_configuration
{
    # Get the code of the target language
    my $target_language_code = shift(@_);
    # Get the key of the file to translate
    my $translation_file_key = shift(@_);
    
    # Read the translation data from the gti.cfg file
    my ($source_file, $target_file, $translation_file_type) =
    &get_translation_data_for($target_language_code, $translation_file_key);
    
    # Check that the file to translate is defined in the gti.cfg file
    if (!$source_file || !$target_file || !$translation_file_type) {
        &throw_fatal_error("Missing or incomplete specification for translation file \"$translation_file_key\" in gti.pl.");
    }
    
    # Check that the source file exists
    my $source_file_path = &util::filename_cat($gsdl_root_directory, $source_file);
    if (!-e $source_file_path) {
        &throw_fatal_error("Source file $source_file_path does not exist.");
    }
    
    # Check that the source file is up to date
    # The "2>/dev/null" is very important! If it is missing this will never return when run from the receptionist
    # unless ($translation_file_is_not_in_cvs) {
    #my $source_file_cvs_status = `cd $gsdl_root_directory; cvs -d $anonymous_cvs_root update $source_file 2>/dev/null`;
    my $source_file_cvs_status = `cd $gsdl_root_directory; svn status $source_file 2>/dev/null`;
    if ($source_file_cvs_status =~ /^C /) {
        &throw_fatal_error("Source file $source_file_path conflicts with the repository.");
    }
    if ($source_file_cvs_status =~ /^M /) {
        &throw_fatal_error("Source file $source_file_path contains uncommitted changes.");
    }
    # }
    
    return ($source_file, $target_file, $translation_file_type);
}


sub get_translation_data_for
{
    my ($target_language_code, $translation_file_key) = @_;
    
    foreach my $translation_file (@$gti_translation_files) {
        # If this isn't the correct translation file, move onto the next one
        next if ($translation_file_key ne $translation_file->{'key'});
        
        # Resolve the target language file
        my $target_language_file = $translation_file->{'target_file'};
        if ($target_language_file =~ /(\{.+\;.+\})/) {
            my $unresolved_target_language_file_part = $1;
            
            # Check for a special case for the target language code
            if ($unresolved_target_language_file_part =~ /(\{|\;)$target_language_code:([^\;]+)(\;|\})/) {
                my $resolved_target_language_file_part = $2;
                $target_language_file =~ s/$unresolved_target_language_file_part/$resolved_target_language_file_part/;
            }
            # Otherwise use the last part as the default value
            else {
                my ($default_target_language_file_part) = $unresolved_target_language_file_part =~ /([^\;]+)\}/;
            $target_language_file =~ s/$unresolved_target_language_file_part/\{$default_target_language_file_part\}/;           
        }
    }
    
    # Resolve instances of {iso_639_1_target_language_name}
    my $iso_639_1_target_language_name = $iso639::fromiso639{$target_language_code};
    $iso_639_1_target_language_name =~ tr/A-Z/a-z/ if $iso_639_1_target_language_name;
    $target_language_file =~ s/\{iso_639_1_target_language_name\}/$iso_639_1_target_language_name/g;
    
    # Resolve instances of {target_language_code}
    $target_language_file =~ s/\{target_language_code\}/$target_language_code/g;
    
    return ($translation_file->{'source_file'}, $target_language_file, $translation_file->{'file_type'});
}

return ();
}


sub read_file_lines
{
    my ($file_path) = @_;
    
    if (!open(FILE_IN, "<$file_path")) {
        &log_message("Note: Could not open file $file_path.");
        return ();
    }
    my @file_lines = <FILE_IN>;
    close(FILE_IN);
    
    return @file_lines;
}


sub build_key_to_line_mapping
{
    my ($file_lines, $translation_file_type) = @_;
    eval "return &build_key_to_line_mapping_for_${translation_file_type}(\@\$file_lines)";
}


sub build_key_to_text_mapping
{
    my ($file_lines, $key_to_line_mapping, $translation_file_type) = @_;
    
    my %key_to_text_mapping = ();
    foreach my $chunk_key (keys(%$key_to_line_mapping)) {
        my $chunk_starting_line = (split(/-/, $key_to_line_mapping->{$chunk_key}))[0];
        my $chunk_finishing_line = (split(/-/, $key_to_line_mapping->{$chunk_key}))[1];
        
        my $chunk_text = @$file_lines[$chunk_starting_line];
        for (my $l = ($chunk_starting_line + 1); $l <= $chunk_finishing_line; $l++) {
            $chunk_text .= @$file_lines[$l];
        }
        
        # Map from chunk key to text
        eval "\$key_to_text_mapping{\${chunk_key}} = &import_chunk_from_${translation_file_type}(\$chunk_text)";
    }
    
    return %key_to_text_mapping;
}


sub build_key_to_last_update_date_mapping
{
    my ($file, $file_lines, $key_to_line_mapping, $translation_file_type) = @_;
    
    # If the files aren't in CVS then we can't tell anything about what needs updating
    # return () if ($translation_file_is_not_in_cvs);
    
    # Build a mapping from key to CVS date
    # Need to be careful with this mapping because the chunk keys won't necessarily all be valid
    my %key_to_cvs_date_mapping = &build_key_to_cvs_date_mapping($file, $translation_file_type);
    
    # Build a mapping from key to comment date
    my %key_to_gti_comment_mapping = &build_key_to_gti_comment_mapping($file_lines, $key_to_line_mapping, $translation_file_type);
    
    # Build a mapping from key to last update date (the latter of the CVS date and comment date)
    my %key_to_last_update_date_mapping = ();
    foreach my $chunk_key (keys(%$key_to_line_mapping)) {
        # Use the CVS date as a starting point
        my $chunk_cvs_date = $key_to_cvs_date_mapping{$chunk_key};
        $key_to_last_update_date_mapping{$chunk_key} = $chunk_cvs_date;
        
        # If a comment date exists and it is after the CVS date, use that instead
        # need to convert the comment date format to SVN format
        my $chunk_gti_comment = $key_to_gti_comment_mapping{$chunk_key};
        if (defined($chunk_gti_comment) && $chunk_gti_comment =~ /(\d?\d-\D\D\D-\d\d\d\d)/) {
            my $chunk_comment_date = $1;           
            if ((!defined($chunk_cvs_date) || &is_date_after($chunk_comment_date, $chunk_cvs_date))) {
                $key_to_last_update_date_mapping{$chunk_key} = $chunk_comment_date;         
            }
        }
    }
    
    return %key_to_last_update_date_mapping;
}


sub build_key_to_cvs_date_mapping
{
    my ($filename, $translation_file_type) = @_;
    
    # Use SVN to annotate each line of the file with the date it was last edited
    # The "2>/dev/null" is very important! If it is missing this will never return when run from the receptionist
    my $cvs_annotated_file = `cd $gsdl_root_directory; svn annotate -v --force $filename 2>/dev/null`;
    
    my @cvs_annotated_file_lines = split(/\n/, $cvs_annotated_file);
    
    my @cvs_annotated_file_lines_date = ();
    foreach my $cvs_annotated_file_line (@cvs_annotated_file_lines) {
        # Extract the date from the SVN annotation at the front
        # svn format : 2007-07-16
        $cvs_annotated_file_line =~ s/^\s+\S+\s+\S+\s(\S+)//; 
        
        push(@cvs_annotated_file_lines_date, $1);
        
        # trim extra date information in svn annotation format
        # 15:42:49 +1200 (Wed, 21 Jun 2006)
        $cvs_annotated_file_line =~ s/^\s+\S+\s\S+\s\((.+?)\)\s//; 
    }    
    
    # Build a key to line mapping for the CVS annotated file, for matching the chunk key to the CVS date
    my %key_to_line_mapping = &build_key_to_line_mapping(\@cvs_annotated_file_lines, $translation_file_type);
    
    my %key_to_cvs_date_mapping = ();
    foreach my $chunk_key (keys(%key_to_line_mapping)) {
        my $chunk_starting_line = (split(/-/, $key_to_line_mapping{$chunk_key}))[0];
        my $chunk_finishing_line = (split(/-/, $key_to_line_mapping{$chunk_key}))[1];
        
        # Find the date this chunk was last edited, from the CVS annotation
        my $chunk_date = $cvs_annotated_file_lines_date[$chunk_starting_line];        
        for (my $l = ($chunk_starting_line + 1); $l <= $chunk_finishing_line; $l++) {
            if (&is_date_after($cvs_annotated_file_lines_date[$l], $chunk_date)) {
                # This part of the chunk has been updated more recently
                $chunk_date = $cvs_annotated_file_lines_date[$l];
                
            }
        }
        
        # Map from chunk key to CVS date
        $key_to_cvs_date_mapping{$chunk_key} = $chunk_date;
    }
    
    return %key_to_cvs_date_mapping;
}


sub build_key_to_gti_comment_mapping
{
    my ($file_lines, $key_to_line_mapping, $translation_file_type) = @_;
    
    my %key_to_gti_comment_mapping = ();
    foreach my $chunk_key (keys(%$key_to_line_mapping)) {
        my $chunk_starting_line = (split(/-/, $key_to_line_mapping->{$chunk_key}))[0];
        my $chunk_finishing_line = (split(/-/, $key_to_line_mapping->{$chunk_key}))[1];
        
        my $chunk_text = @$file_lines[$chunk_starting_line];
        for (my $l = ($chunk_starting_line + 1); $l <= $chunk_finishing_line; $l++) {
            $chunk_text .= @$file_lines[$l];
        }
        
        # Map from chunk key to GTI comment
        my $chunk_gti_comment;
        eval "\$chunk_gti_comment = &get_${translation_file_type}_chunk_gti_comment(\$chunk_text)";
        $key_to_gti_comment_mapping{$chunk_key} = $chunk_gti_comment if (defined($chunk_gti_comment));
    }
    
    return %key_to_gti_comment_mapping;
}


sub determine_chunks_requiring_translation
{
    my $source_file_key_to_text_mapping = shift(@_);
    my $target_file_key_to_text_mapping = shift(@_);
    
    # Chunks needing translation are those in the source file with no translation in the target file
    my @target_file_keys_requiring_translation = ();
    foreach my $chunk_key (keys(%$source_file_key_to_text_mapping)) {
        if ($source_file_key_to_text_mapping->{$chunk_key} && !$target_file_key_to_text_mapping->{$chunk_key}) {
            # &log_message("Chunk with key $chunk_key needs translating.");
            push(@target_file_keys_requiring_translation, $chunk_key);
        }
    }
    
    return @target_file_keys_requiring_translation;
}


sub determine_chunks_requiring_updating
{
    my $source_file_key_to_last_update_date_mapping = shift(@_);
    my $target_file_key_to_last_update_date_mapping = shift(@_);
    
    # Chunks needing updating are those in the target file that have been more recently edited in the source file
    my @target_file_keys_requiring_updating = ();
    foreach my $chunk_key (keys(%$source_file_key_to_last_update_date_mapping)) {
        my $source_chunk_last_update_date = $source_file_key_to_last_update_date_mapping->{$chunk_key};
        my $target_chunk_last_update_date = $target_file_key_to_last_update_date_mapping->{$chunk_key};
        
        # print "key: $chunk_key\nsource date : $source_chunk_last_update_date\ntarget date : $target_chunk_last_update_date\nafter? ". &is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date) . "\n\n";

        if (defined($target_chunk_last_update_date) && &is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date)) {
            # &log_message("Chunk with key $chunk_key needs updating.");
                # &log_message("key: $chunk_key\nsource date : $source_chunk_last_update_date\ntarget date : $target_chunk_last_update_date\nafter? ". &is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date) . "\n\n");
            push(@target_file_keys_requiring_updating, $chunk_key);
        }
    }
    
    return @target_file_keys_requiring_updating;
}


sub is_chunk_automatically_translated
{
    my ($chunk_key, $translation_file_type) = @_;
    eval "return &is_${translation_file_type}_chunk_automatically_translated(\$chunk_key)";
}


sub make_text_xml_safe
{
    my $text = shift(@_);
    $text =~ s/\&/\&amp\;/g;
    $text =~ s/\&amp\;lt\;/\&amp\;amp\;lt\;/g;
    $text =~ s/\&amp\;gt\;/\&amp\;amp\;gt\;/g;
    $text =~ s/\&amp\;rarr\;/\&amp\;amp\;rarr\;/g;
    $text =~ s/\&amp\;mdash\;/\&amp\;amp\;mdash\;/g;
    $text =~ s/</\&lt\;/g;
    $text =~ s/>/\&gt\;/g;
    return $text;
}


sub unmake_text_xml_safe
{
    my $text = shift(@_);
    $text =~ s/\&lt\;/</g;
    $text =~ s/\&gt\;/>/g;
    $text =~ s/\&amp\;/\&/g;
    return $text;
}


# Returns 1 if $date1 is after $date2, 0 otherwise
sub is_date_after_cvs
{
    my ($date1, $date2) = @_;
    my %months = ("Jan", 1, "Feb", 2, "Mar", 3, "Apr",  4, "May",  5, "Jun",  6,
    "Jul", 7, "Aug", 8, "Sep", 9, "Oct", 10, "Nov", 11, "Dec", 12);
    
    if(!defined $date1) {
        return 1;
    }
    
    my @date1parts = split(/-/, $date1);
    my @date2parts = split(/-/, $date2);
    
    # Compare year - nasty because we have rolled over into a new century
    my $year1 = $date1parts[2];
    if ($year1 < 80) {
        $year1 += 2000;
    }
    my $year2 = $date2parts[2];
    if ($year2 < 80) {
        $year2 += 2000;
    }
    
    # Compare year
    if ($year1 > $year2) {
        return 1;
    }
    elsif ($year1 == $year2) {
        # Year is the same, so compare month
        if ($months{$date1parts[1]} > $months{$date2parts[1]}) {
            return 1;
        }
        elsif ($months{$date1parts[1]} == $months{$date2parts[1]}) {
            # Month is the same, so compare day
            if ($date1parts[0] > $date2parts[0]) {
                return 1;
            }
        }
    }
    
    return 0;
}

sub is_date_after
{
    my ($date1, $date2) = @_;
    
    if(!defined $date1) {
        return 1;
    }
    if(!defined $date2) {
        return 0;
    }
    
    # 16-Aug-2006
    if($date1=~ /(\d+?)-(\S\S\S)-(\d\d\d\d)/){
        my %months = ("Jan", "01", "Feb", "02", "Mar", "03", "Apr",  "04", "May",  "05", "Jun",  "06",
        "Jul", "07", "Aug", "08", "Sep", "09", "Oct", "10", "Nov", "11", "Dec", "12");
        $date1=$3 . "-" . $months{$2} . "-" . $1;
        # print "** converted date1: $date1\n";
    }
    if($date2=~ /(\d+?)-(\S\S\S)-(\d\d\d\d)/){
        my %months = ("Jan", "01", "Feb", "02", "Mar", "03", "Apr",  "04", "May",  "05", "Jun",  "06",
        "Jul", "07", "Aug", "08", "Sep", "09", "Oct", "10", "Nov", "11", "Dec", "12");
        $date2=$3 . "-" . $months{$2} . "-" . $1;
        # print "** converted date2: $date2\n";
    }
    
    
    # 2006-08-16
    my @date1parts = split(/-/, $date1);
    my @date2parts = split(/-/, $date2);
    
    # Compare year
    if ($date1parts[0] > $date2parts[0]) {
        return 1;
    }
    elsif ($date1parts[0] == $date2parts[0]) {
        # Year is the same, so compare month
        if ($date1parts[1] > $date2parts[1]) {
            return 1;
        }
        elsif ($date1parts[1] == $date2parts[1]) {
            # Month is the same, so compare day
            if ($date1parts[2] > $date2parts[2]) {
                return 1;
            }
        }
    }    
    
    return 0;
}


sub create_xml_response_for_chunks_requiring_work
{
    my ($translation_file_key, $target_file, $total_num_chunks, $target_files_keys_requiring_translation, $target_files_keys_requiring_updating, $num_chunks_to_return, $source_files_key_to_text_mapping, $target_files_key_to_text_mapping, $source_files_key_to_last_update_date_mapping, $target_files_key_to_last_update_date_mapping) = @_;
    
    # Form an XML response to the command
    my $xml_response = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
    $xml_response .= "<GTIResponse>\n";
    $xml_response .= "  <TranslationFile"
    . " key=\"" . $translation_file_key . "\""
    . " target_file_path=\"" . $target_file . "\""
    . " num_chunks_translated=\"" . ($total_num_chunks - scalar(@$target_files_keys_requiring_translation)) . "\""
    . " num_chunks_requiring_translation=\"" . scalar(@$target_files_keys_requiring_translation) . "\""
    . " num_chunks_requiring_updating=\"" . scalar(@$target_files_keys_requiring_updating) . "\"\/>\n";
    
    # Do chunks requiring translation first
    if ($num_chunks_to_return > scalar(@$target_files_keys_requiring_translation)) {
        $xml_response .= "  <ChunksRequiringTranslation size=\"" . scalar(@$target_files_keys_requiring_translation) . "\">\n";
    }
    else {
        $xml_response .= "  <ChunksRequiringTranslation size=\"" . $num_chunks_to_return . "\">\n";
    }
    
    my @sorted_chunk_keys = sort (@$target_files_keys_requiring_translation);
    foreach my $chunk_key (@sorted_chunk_keys) {
        last if ($num_chunks_to_return == 0);
        
        my $source_file_chunk_date = $source_files_key_to_last_update_date_mapping->{$chunk_key} || "";
        my $source_file_chunk_text = &make_text_xml_safe($source_files_key_to_text_mapping->{$chunk_key});  
        
        $xml_response .= "    <Chunk key=\"" . &make_text_xml_safe($chunk_key) . "\">\n";
        $xml_response .= "      <SourceFileText date=\"$source_file_chunk_date\">$source_file_chunk_text</SourceFileText>\n";   
        $xml_response .= "      <TargetFileText></TargetFileText>\n";
        $xml_response .= "    </Chunk>\n";
        
        $num_chunks_to_return--;
    }
    
    $xml_response .= "  </ChunksRequiringTranslation>\n";
    
    # Then do chunks requiring updating
    if ($num_chunks_to_return > scalar(@$target_files_keys_requiring_updating)) {
        $xml_response .= "  <ChunksRequiringUpdating size=\"" . scalar(@$target_files_keys_requiring_updating) . "\">\n";
    }
    else {
        $xml_response .= "  <ChunksRequiringUpdating size=\"" . $num_chunks_to_return . "\">\n";
    }
    
    # foreach my $chunk_key (@target_file_keys_requiring_updating) {
    @sorted_chunk_keys = sort (@$target_files_keys_requiring_updating);
    foreach my $chunk_key (@sorted_chunk_keys) {
        last if ($num_chunks_to_return == 0);
        
        my $source_file_chunk_date = $source_files_key_to_last_update_date_mapping->{$chunk_key} || "";
        my $source_file_chunk_text = &make_text_xml_safe($source_files_key_to_text_mapping->{$chunk_key});
        my $target_file_chunk_date = $target_files_key_to_last_update_date_mapping->{$chunk_key} || "";
        my $target_file_chunk_text = &make_text_xml_safe($target_files_key_to_text_mapping->{$chunk_key});
        
        $xml_response .= "    <Chunk key=\"" . &make_text_xml_safe($chunk_key) . "\">\n";   
        $xml_response .= "      <SourceFileText date=\"$source_file_chunk_date\">$source_file_chunk_text</SourceFileText>\n";
        $xml_response .= "      <TargetFileText date=\"$target_file_chunk_date\">$target_file_chunk_text</TargetFileText>\n";
        $xml_response .= "    </Chunk>\n";
        
        $num_chunks_to_return--;
    }
    
    $xml_response .= "  </ChunksRequiringUpdating>\n";
    
    $xml_response .= "</GTIResponse>\n";
    
    return $xml_response;
}

sub create_xml_response_for_uptodate_chunks
{
    my ($translation_file_key, $target_file, $uptodate_target_files_keys, $source_files_key_to_text_mapping, $target_files_key_to_text_mapping, $source_files_key_to_last_update_date_mapping, $target_files_key_to_last_update_date_mapping) = @_;
    
    # Form an XML response to the command
    my $xml_response = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
    $xml_response .= "<GTIResponse>\n";
    $xml_response .= "  <TranslationFile"
    . " key=\"" . $translation_file_key . "\""
    . " target_file_path=\"" . $target_file . "\""
    . " num_chunks_uptodate=\"" . scalar(@$uptodate_target_files_keys) . "\"\/>\n";
    
    
    # Then do chunks requiring updating
    $xml_response .= "  <UptodateChunks size=\"" . scalar(@$uptodate_target_files_keys) . "\">\n";
    
    
    # foreach my $chunk_key (@uptodate_target_file_keys) {
    my @sorted_chunk_keys = sort (@$uptodate_target_files_keys);
    foreach my $chunk_key (@sorted_chunk_keys) {
        
        my $source_file_chunk_date = $source_files_key_to_last_update_date_mapping->{$chunk_key} || "";
        my $source_file_chunk_text = &make_text_xml_safe($source_files_key_to_text_mapping->{$chunk_key});
        my $target_file_chunk_date = $target_files_key_to_last_update_date_mapping->{$chunk_key} || "";
        my $target_file_chunk_text = &make_text_xml_safe($target_files_key_to_text_mapping->{$chunk_key});
        
        $xml_response .= "    <Chunk key=\"" . &make_text_xml_safe($chunk_key) . "\">\n";   
        $xml_response .= "      <SourceFileText date=\"$source_file_chunk_date\">$source_file_chunk_text</SourceFileText>\n";
        $xml_response .= "      <TargetFileText date=\"$target_file_chunk_date\">$target_file_chunk_text</TargetFileText>\n";
        $xml_response .= "    </Chunk>\n";

    }
    
    $xml_response .= "  </UptodateChunks>\n";
    
    $xml_response .= "</GTIResponse>\n";
    
    return $xml_response;
}

sub create_xml_response_for_all_chunks
{
    my ($translation_file_key, $target_file, $source_file_key_to_text_mapping, $target_file_key_to_text_mapping, $source_file_key_to_last_update_date_mapping, $target_file_key_to_last_update_date_mapping) = @_;
    
    # Form an XML response to the command
    my $xml_response = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
    $xml_response .= "<GTIResponse>\n";
    $xml_response .= "  <TranslationFile"
    . " key=\"" . $translation_file_key . "\""
    . " target_file_path=\"" . $target_file . "\"\/>\n";
    
    # Do all the chunks
    $xml_response .= "  <Chunks size=\"" . scalar(keys(%$source_file_key_to_text_mapping)) . "\">\n";
    
    my @sorted_chunk_keys = sort (keys(%$source_file_key_to_text_mapping));
    foreach my $chunk_key (@sorted_chunk_keys) {
        my $source_file_chunk_date = $source_file_key_to_last_update_date_mapping->{$chunk_key} || "";
        my $source_file_chunk_text = &make_text_xml_safe($source_file_key_to_text_mapping->{$chunk_key});
        
        $xml_response .= "    <Chunk key=\"" . &make_text_xml_safe($chunk_key) . "\">\n";
        $xml_response .= "      <SourceFileText date=\"$source_file_chunk_date\">$source_file_chunk_text</SourceFileText>\n";
        if (defined($target_file_key_to_text_mapping->{$chunk_key})) {
            my $target_file_chunk_date = $target_file_key_to_last_update_date_mapping->{$chunk_key} || "";
            my $target_file_chunk_text = &make_text_xml_safe($target_file_key_to_text_mapping->{$chunk_key});
            $xml_response .= "      <TargetFileText date=\"$target_file_chunk_date\">$target_file_chunk_text</TargetFileText>\n";
        }
        else {
            $xml_response .= "      <TargetFileText></TargetFileText>\n";
        }
        
        $xml_response .= "    </Chunk>\n";
    }
    $xml_response .= "  </Chunks>\n";
    
    $xml_response .= "</GTIResponse>\n";
    return $xml_response;
}



# ==========================================================================================
#   MACROFILE FUNCTIONS

sub build_key_to_line_mapping_for_macrofile
{
    my (@file_lines) = @_;
    
    my $macro_package;
    my %chunk_key_to_line_mapping = ();
    # Process the contents of the file, line by line
    for (my $i = 0; $i < scalar(@file_lines); $i++) {
        my $line = $file_lines[$i];
        $line =~ s/(\s*)$//;  # Remove any nasty whitespace, carriage returns etc.
        
        # Check if a new package is being defined
        if ($line =~ m/^package\s+(.+)/) {
            $macro_package = $1;
        }
        
        # Line contains a macro name
        elsif ($line =~ m/^(_\w+_)/) {
            my $macro_key = $1;
            $line =~ s/\s*([^\\]\#[^\}]+)?$//;  # Remove any comments and nasty whitespace
            
            # While there is still text of the macro to go...
            my $startline = $i;
            while ($line !~ /\}$/) {
                $i++;
                if ($i == scalar(@file_lines)) {
                    &throw_fatal_error("Could not find end of macro $macro_key.");
                }
                $line = $file_lines[$i];
                $line =~ s/\s*([^\\]\#[^\}]+)?$//;  # Remove any comments and nasty whitespace
            }
        
        # The chunk key consists of the package name and the macro key
        my $chunk_key = $macro_package . "." . $macro_key;
        # Map from chunk key to line
        $chunk_key_to_line_mapping{$chunk_key} = $startline . "-" . $i;
    }
    
    # Icon: line in format ## "image text" ## image_type ## macro_name ##
    elsif ($line =~ m/^\#\# .* \#\# .* \#\# (.*) \#\#/) {
    # The chunk key consists of package name and macro key
    my $chunk_key = $macro_package . "." . $1;
    # Map from chunk key to line
    $chunk_key_to_line_mapping{$chunk_key} = $i . "-" . $i;
}
}

return %chunk_key_to_line_mapping;
}


sub import_chunk_from_macrofile
{
    my ($chunk_text) = @_;
    
    # Is this an icon macro??
    if ($chunk_text =~ /^\#\# (.*)/) {
        # Extract image macro text
        $chunk_text =~ /^\#\#\s+([^\#]+)\s+\#\#/;
        $chunk_text = $1;
    
    # Remove enclosing quotes
    $chunk_text =~ s/^\"//;
    $chunk_text =~ s/\"$//;
}

# No, so it must be a text macro
else {
    # Remove macro key
    $chunk_text =~ s/^_([^_]+)_(\s*)//;
    
    # Remove language specifier
    $chunk_text =~ s/^\[l=.*\](\s*)//;
    
    # Remove braces enclosing text
    $chunk_text =~ s/^{(\s*)((.|\n)*)}(\s*)(\#.+\s*)?/$2/;
}

return $chunk_text;
}


sub get_macrofile_chunk_gti_comment
{
    my ($chunk_text) = @_;
    
    # Check for an "Updated DD-MMM-YYYY" comment at the end of the chunk
    if ($chunk_text =~ /\#\s+(Updated\s+\d?\d-\D\D\D-\d\d\d\d.*)\s*$/i) {
        return $1;
}

return undef;
}


sub is_macrofile_chunk_automatically_translated
{
    my ($chunk_key) = @_;
    
    # The _httpiconX_, _widthX_ and _heightX_ image macros are automatically translated
    if ($chunk_key =~ /\._(httpicon|width|height)/) {
        return 1;
    }
    
    return 0;
}


# Use the source file to generate a target file that is formatted the same
sub write_translated_macrofile
{
    my $source_file = shift(@_);  # Not used
    my @source_file_lines = @{shift(@_)};
    my $source_file_key_to_text_mapping = shift(@_);
    my $target_file = shift(@_);
    my @target_file_lines = @{shift(@_)};
    my $target_file_key_to_text_mapping = shift(@_);
    my $target_file_key_to_gti_comment_mapping = shift(@_);
    my $target_language_code = shift(@_);
    
    # Build a mapping from source file line to chunk key
    my %source_file_key_to_line_mapping = &build_key_to_line_mapping_for_macrofile(@source_file_lines);
    my %source_file_line_to_key_mapping = ();
    foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
        $source_file_line_to_key_mapping{$source_file_key_to_line_mapping{$chunk_key}} = $chunk_key;
    }
    my @source_file_line_keys = (sort sort_by_line (keys(%source_file_line_to_key_mapping)));
    my $source_file_line_number = 0;
    
    # Build a mapping from target file line to chunk key
    my %target_file_key_to_line_mapping = &build_key_to_line_mapping_for_macrofile(@target_file_lines);
    my %target_file_line_to_key_mapping = ();
    foreach my $chunk_key (keys(%target_file_key_to_line_mapping)) {
        $target_file_line_to_key_mapping{$target_file_key_to_line_mapping{$chunk_key}} = $chunk_key;
    }
    my @target_file_line_keys = (sort sort_by_line (keys(%target_file_line_to_key_mapping)));
    
    # Write the new target file
    my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
    if (!open(TARGET_FILE, ">$target_file_path")) {
        &throw_fatal_error("Could not write target file $target_file_path.");
    }
    
    # Use the header from the target file, to keep language and author information
    if (scalar(@target_file_line_keys) > 0) {
        my $target_file_line_number = 0;
        my $target_file_chunk_starting_line_number = (split(/-/, $target_file_line_keys[0]))[0];
        while ($target_file_line_number < $target_file_chunk_starting_line_number) {
            my $target_file_line = $target_file_lines[$target_file_line_number];
            last if ($target_file_line =~ /^\# -- Missing translation: /);  # We don't want to get into the macros
                print TARGET_FILE $target_file_line;
            $target_file_line_number++;
        }
        
        $source_file_line_number = (split(/-/, $source_file_line_keys[0]))[0];
    }
    
    # Model the new target file on the source file, with the target file translations
    foreach my $line_key (@source_file_line_keys) {
        # Fill in the gaps before this chunk starts
        my $source_file_chunk_starting_line_number = (split(/-/, $line_key))[0];
        my $source_file_chunk_finishing_line_number = (split(/-/, $line_key))[1];
        while ($source_file_line_number < $source_file_chunk_starting_line_number) {
            print TARGET_FILE $source_file_lines[$source_file_line_number];
            $source_file_line_number++;
        }
        $source_file_line_number = $source_file_chunk_finishing_line_number + 1;
        
        my $chunk_key = $source_file_line_to_key_mapping{$line_key};
        my $source_file_chunk_text = $source_file_key_to_text_mapping->{$chunk_key};
        my $target_file_chunk_text = $target_file_key_to_text_mapping->{$chunk_key} || "";
        
        my $macrofile_key = $chunk_key;
        $macrofile_key =~ s/^(.+?)\.//;
        
        # If no translation exists for this chunk, show this, and move on
        if ($source_file_chunk_text ne "" && $target_file_chunk_text eq "") {
            print TARGET_FILE "# -- Missing translation: $macrofile_key\n";
            next;
        }
        
        # Grab the source chunk text
        my $source_file_chunk = $source_file_lines[$source_file_chunk_starting_line_number];
        for (my $l = ($source_file_chunk_starting_line_number + 1); $l <= $source_file_chunk_finishing_line_number; $l++) {
            $source_file_chunk .= $source_file_lines[$l];
        }
        
        # Is this an icon macro??
        if ($source_file_chunk =~ /^\#\# (.*)/) {
            # Escape any newline and question mark characters so the source text is replaced correctly
            $source_file_chunk_text =~ s/\\/\\\\/g;
        $source_file_chunk_text =~ s/\?/\\\?/g;
        
        # Build the new target chunk from the source chunk
        my $target_file_chunk = $source_file_chunk;
        $target_file_chunk =~ s/$source_file_chunk_text/$target_file_chunk_text/;
        $target_file_chunk =~ s/(\s)*$//;
        print TARGET_FILE "$target_file_chunk";
    }
    
    # No, it is just a normal text macro
    else {
        print TARGET_FILE "$macrofile_key [l=$target_language_code] {$target_file_chunk_text}";
    }
    
    # Add the "updated" comment, if one exists
    if ($target_file_key_to_gti_comment_mapping->{$chunk_key}) {
        print TARGET_FILE "  # " . $target_file_key_to_gti_comment_mapping->{$chunk_key};
    }
    print TARGET_FILE "\n";
}

close(TARGET_FILE);
}


sub sort_by_line
{
    return ((split(/-/, $a))[0] <=> (split(/-/, $b))[0]);
}


# ==========================================================================================
#   RESOURCE BUNDLE FUNCTIONS

# need to handle multi-line properties. A multiline ends on \ if it continues over the next line
sub build_key_to_line_mapping_for_resource_bundle
{
    my (@file_lines) = @_;
    
    my %chunk_key_to_line_mapping = ();

    my $chunk_key;
    my $startindex = -1;

    for (my $i = 0; $i < scalar(@file_lines); $i++) {
        my $line = $file_lines[$i];
        $line =~ s/(\s*)$//;  # Remove any nasty whitespace, carriage returns etc.
        
        # Line contains a dictionary string
        if ($line =~ /^(\S+?)[:|=](.*)$/) {
            $chunk_key = $1;
            $startindex = $i;
        }       
        if ($startindex != -1) {
            if($line !~ m/\\$/) { # line finished
            # $i keeps track of the line at which this property (chunk_key) finishes

            # Map from chunk key to line
            $chunk_key_to_line_mapping{$chunk_key} = $startindex . "-" . $i;
            $startindex = -1;
            $chunk_key = "";
            }
        }               
    }
    
    return %chunk_key_to_line_mapping;
}


sub import_chunk_from_resource_bundle
{
    my ($chunk_text) = @_;
    
    # Simple: just remove string key
    $chunk_text =~ s/^(\S+?)[:|=](\s*)//s;
    $chunk_text =~ s/(\s*)$//s;  # Remove any nasty whitespace, carriage returns etc.
    $chunk_text =~ s/(\s*)\#\s+Updated\s+(\d?\d-\D\D\D-\d\d\d\d.*)\s*$//is;
    
    return $chunk_text;
}


sub get_resource_bundle_chunk_gti_comment
{
    my ($chunk_text) = @_;
    
    # Check for an "Updated DD-MMM-YYYY" comment at the end of the chunk
    if ($chunk_text =~ /\#\s+(Updated\s+\d?\d-\D\D\D-\d\d\d\d.*)\s*$/i) {
        return $1;
}

return undef;
}


sub is_resource_bundle_chunk_automatically_translated
{
    # No resource bundle chunks are automatically translated
    return 0;
}


sub write_translated_resource_bundle
{
    my $source_file = shift(@_);  # Not used
    my @source_file_lines = @{shift(@_)};
    my $source_file_key_to_text_mapping = shift(@_);
    my $target_file = shift(@_);
    my @target_file_lines = @{shift(@_)};  # Not used
    my $target_file_key_to_text_mapping = shift(@_);
    my $target_file_key_to_gti_comment_mapping = shift(@_);
    my $target_language_code = shift(@_);  # Not used
    
    # Build a mapping from chunk key to source file line, and from source file line to chunk key
    my %source_file_key_to_line_mapping = &build_key_to_line_mapping_for_resource_bundle(@source_file_lines);
    my %source_file_line_to_key_mapping = ();
    foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
        $source_file_line_to_key_mapping{$source_file_key_to_line_mapping{$chunk_key}} = $chunk_key;
    }
    
    # Write the new target file
    my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
    if (!open(TARGET_FILE, ">$target_file_path")) {
        &throw_fatal_error("Could not write target file $target_file_path.");
    }
    
    # Model the new target file on the source file, with the target file translations
    my $source_file_line_number = 0;
    foreach my $line_key (sort sort_by_line (keys(%source_file_line_to_key_mapping))) {
        # Fill in the gaps before this chunk starts
        my $source_file_chunk_starting_line_number = (split(/-/, $line_key))[0];
        my $source_file_chunk_finishing_line_number = (split(/-/, $line_key))[1];
        while ($source_file_line_number < $source_file_chunk_starting_line_number) {
            print TARGET_FILE $source_file_lines[$source_file_line_number];
            $source_file_line_number++;
        }
        $source_file_line_number = $source_file_chunk_finishing_line_number + 1;
        
        my $chunk_key = $source_file_line_to_key_mapping{$line_key};
        my $source_file_chunk_text = $source_file_key_to_text_mapping->{$chunk_key};
        my $target_file_chunk_text = $target_file_key_to_text_mapping->{$chunk_key} || "";
        
        # If no translation exists for this chunk, show this, and move on
        if ($source_file_chunk_text ne "" && $target_file_chunk_text eq "") {
            print TARGET_FILE "# -- Missing translation: $chunk_key\n";
            next;
        }
        
        print TARGET_FILE "$chunk_key:$target_file_chunk_text";
        if ($target_file_key_to_gti_comment_mapping->{$chunk_key}) {
            print TARGET_FILE "  # " . $target_file_key_to_gti_comment_mapping->{$chunk_key};
        }
        print TARGET_FILE "\n";
    }
    
    close(TARGET_FILE);
}


# ==========================================================================================
#   GREENSTONE XML FUNCTIONS

sub build_key_to_line_mapping_for_greenstone_xml
{
    my (@file_lines) = @_;
    
    my %chunk_key_to_line_mapping = ();
    for (my $i = 0; $i < scalar(@file_lines); $i++) {
        my $line = $file_lines[$i];
        $line =~ s/(\s*)$//;  # Remove any nasty whitespace, carriage returns etc.
        
        # Line contains a string to translate
        if ($line =~ /^\s*<Text id=\"(.*?)\">/) {
            my $chunk_key = $1;
            $line =~ s/\s*$//;  # Remove any nasty whitespace
            $line =~ s/<Updated date=\"\d?\d-\D\D\D-\d\d\d\d.*\"\/>$//;
            
            # While there is still text of the string to go...
            my $startline = $i;
            while ($line !~ /<\/Text>$/) {
                $i++;
                if ($i == scalar(@file_lines)) {
                    &throw_fatal_error("Could not find end of string $chunk_key.");
                }
                $line = $file_lines[$i];
                $line =~ s/\s*$//;  # Remove any nasty whitespace
                $line =~ s/<Updated date=\"\d?\d-\D\D\D-\d\d\d\d.*\"\/>$//;
            }
            
            # Map from chunk key to line
            if (!defined($chunk_key_to_line_mapping{$chunk_key})) {
                $chunk_key_to_line_mapping{$chunk_key} = $startline . "-" . $i;
            }
            else {
                &throw_fatal_error("Duplicate key $chunk_key.");
            }
        }
    }
    
    return %chunk_key_to_line_mapping;
}


sub import_chunk_from_greenstone_xml
{
    my ($chunk_text) = @_;
    
    # Simple: just remove the Text tags
    $chunk_text =~ s/^\s*<Text id=\"(.*?)\">(\s*)//;
    $chunk_text =~ s/<Updated date=\"\d?\d-\D\D\D-\d\d\d\d.*\"\/>$//;
    $chunk_text =~ s/<\/Text>$//;
    
    return $chunk_text;
}


sub get_greenstone_xml_chunk_gti_comment
{
    my ($chunk_text) = @_;
    
    # Check for an "Updated DD-MMM-YYYY" comment at the end of the chunk
    if ($chunk_text =~ /<Updated date=\"(\d?\d-\D\D\D-\d\d\d\d.*)\"\/>$/i) {
        return $1;
    }
    
    return undef;
}


sub is_greenstone_xml_chunk_automatically_translated
{
    # No greenstone XML chunks are automatically translated
    return 0;
}


sub write_translated_greenstone_xml
{
    my $source_file = shift(@_);  # Not used
    my @source_file_lines = @{shift(@_)};
    my $source_file_key_to_text_mapping = shift(@_);
    my $target_file = shift(@_);
    my @target_file_lines = @{shift(@_)};  # Not used
    my $target_file_key_to_text_mapping = shift(@_);
    my $target_file_key_to_gti_comment_mapping = shift(@_);
    my $target_language_code = shift(@_);  # Not used
    
    # Build a mapping from chunk key to source file line, and from source file line to chunk key
    my %source_file_key_to_line_mapping = &build_key_to_line_mapping_for_greenstone_xml(@source_file_lines);
    my %source_file_line_to_key_mapping = ();
    foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
        $source_file_line_to_key_mapping{$source_file_key_to_line_mapping{$chunk_key}} = $chunk_key;
    }
    
    # Write the new target file
    my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
    if (!open(TARGET_FILE, ">$target_file_path")) {
        &throw_fatal_error("Could not write target file $target_file_path.");
    }
    
    # Model the new target file on the source file, with the target file translations
    my $source_file_line_number = 0;
    foreach my $line_key (sort sort_by_line (keys(%source_file_line_to_key_mapping))) {
        # Fill in the gaps before this chunk starts
        my $source_file_chunk_starting_line_number = (split(/-/, $line_key))[0];
        my $source_file_chunk_finishing_line_number = (split(/-/, $line_key))[1];
        while ($source_file_line_number < $source_file_chunk_starting_line_number) {
            print TARGET_FILE $source_file_lines[$source_file_line_number];
            $source_file_line_number++;
        }
        $source_file_line_number = $source_file_chunk_finishing_line_number + 1;
        
        my $chunk_key = $source_file_line_to_key_mapping{$line_key};
        my $source_file_chunk_text = $source_file_key_to_text_mapping->{$chunk_key};
        my $target_file_chunk_text = $target_file_key_to_text_mapping->{$chunk_key} || "";
        $target_file_chunk_text =~ s/(\n)*$//g;
        
        # If no translation exists for this chunk, show this, and move on
        if ($source_file_chunk_text ne "" && $target_file_chunk_text eq "") {
            print TARGET_FILE "<!-- Missing translation: $chunk_key -->\n";
            next;
        }
        
        print TARGET_FILE "<Text id=\"$chunk_key\">$target_file_chunk_text</Text>";
        if ($target_file_key_to_gti_comment_mapping->{$chunk_key}) {
            my $chunk_gti_comment = $target_file_key_to_gti_comment_mapping->{$chunk_key};
            $chunk_gti_comment =~ s/^Updated //;
            print TARGET_FILE "<Updated date=\"" . $chunk_gti_comment . "\"\/>";
        }
        print TARGET_FILE "\n";
    }
    
    # Fill in the end of the file
    while ($source_file_line_number < scalar(@source_file_lines)) {
        print TARGET_FILE $source_file_lines[$source_file_line_number];
        $source_file_line_number++;
    }
    
    close(TARGET_FILE);
}


# ==========================================================================================
#   GREENSTONE3 FUNCTIONS

sub get_all_chunks_for_gs3
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    my $translation_file_key = lc(shift(@_));
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code) {
        &throw_fatal_error("Missing command argument.");
    }
    
    # Get (and check) the translation configuration
    # my ($source_file_dir, $target_file, $translation_file_type) = &get_translation_configuration($target_language_code, $translation_file_key);
    
    my %source_files_key_to_text_mapping = ();
    my %target_files_key_to_text_mapping = ();
    my %source_files_key_to_last_update_date_mapping = ();
    my %target_files_key_to_last_update_date_mapping = ();
    
    &build_gs3_configuration($target_language_code, \%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping, \%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);
    
    &log_message("Total number of source chunks: " . scalar(keys(%source_files_key_to_text_mapping)));
    &log_message("Total number of target chunks: " . scalar(keys(%target_files_key_to_text_mapping)));
    
    my $xml_response = &create_xml_response_for_all_chunks($translation_file_key, "", \%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping, \%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);   
    return $xml_response;
}


sub get_first_n_chunks_requiring_work_for_gs3
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    # The number of chunks to return (defaults to one if not specified)
    my $num_chunks_to_return = shift(@_) || "1";
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key) {
        &throw_fatal_error("Missing command argument.");
    }

    my %source_files_key_to_text_mapping = ();
    my %target_files_key_to_text_mapping = ();
    my %source_files_key_to_last_update_date_mapping = ();
    my %target_files_key_to_last_update_date_mapping = ();
    
    &build_gs3_configuration($target_language_code, \%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping, 
    \%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);
    
    # Determine the target file chunks requiring translation
    my @target_files_keys_requiring_translation = &determine_chunks_requiring_translation(\%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping);    
    # Determine the target file chunks requiring updating
    my @target_files_keys_requiring_updating = &determine_chunks_requiring_updating(\%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);
    &log_message("Total number of target chunks requiring translation: " . scalar(@target_files_keys_requiring_translation));
    &log_message("Total number of target chunks requiring updating: " . scalar(@target_files_keys_requiring_updating));

    my $download_target_filepath = "";


    # ****** DOWNLOADING LANGUAGE FILES WAS NOT YET IMPLEMENTED FOR GS3. RUDIMENTARY VERSION ****** #

    # if there is no copy of the language files for download, there's also no link to the spreadsheet
    # for translating offline. So GS3's download option, we will zip up all the relevant greenstone 3
    # interface *.properties files,and link to that zip as the file for offline translation.
    # Selecting only properties files for English and the language they're working on (if the last exists)

    # tar -cvzf gs3interface.tar.gz greenstone3/AbstractBrowse.properties greenstone3/AbstractBrowse_nl.properties 
    # will generate a tar file containing a folder called "greenstone3" with the specified *.properties files

    my $sourcedir = "greenstone3";
    my $zip = &FileUtils::filenameConcatenate("tmp", "gs3interface_".$target_language_code.".tar.gz");
    my $tar_cmd = "tar -cvzf $zip";


    # store cur dir and cd to gsdlhome to generate the correct path in the zip file
    my $curdir = `pwd`;
    chdir $gsdl_root_directory;

    my $filelisting = "";
    foreach my $interface_file (@gs3_interface_files) {

    my $source_filepath = &FileUtils::filenameConcatenate($sourcedir, $interface_file.".properties");
    my $target_filepath = &FileUtils::filenameConcatenate($sourcedir, $interface_file."_".$target_language_code.".properties");
    
    $filelisting = "$filelisting $source_filepath"; 
    if(&FileUtils::fileExists($target_filepath)) {
        $filelisting = "$filelisting $target_filepath";
    }
    }
    $tar_cmd .= " $filelisting";

    # tar command will overwrite the previous version, but want to check we've created it
    if(&FileUtils::fileExists($zip)) {
    &FileUtils::removeFiles($zip);
    }

    #my $tar_result = system($tar_cmd); # works but then interface breaks
    `$tar_cmd`;
    my $tar_result = $?;

    if(&FileUtils::fileExists($zip)) { ## if($tar_result == 0) {, # breaks the interface
    $download_target_filepath = $zip;
    } else {
    &log_message("Unable to generate zip containing gs3interface files " . $download_target_filepath . "$!");
    }

    # change back to original working directory (cgi-bin/linux probably)
    chdir $curdir;

    # ************** END RUDIMENTARY VERSION OF DOWNLOADING LANGUAGE FILES FOR GS3 ************* #


    my $xml_response = &create_xml_response_for_chunks_requiring_work($translation_file_key, $download_target_filepath, scalar(keys(%source_files_key_to_text_mapping)),
    \@target_files_keys_requiring_translation, \@target_files_keys_requiring_updating,
    $num_chunks_to_return, \%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping,
    \%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);
    
    return $xml_response;
}

sub get_uptodate_chunks_for_gs3
{
    # The code of the target language (ensure it is lowercase)
    my $target_language_code = lc(shift(@_));
    # The key of the file to translate (ensure it is lowercase)
    my $translation_file_key = lc(shift(@_));
    # The number of chunks to return (defaults to one if not specified)
    my $num_chunks_to_return = shift(@_) || "1";
    
    # Check that the necessary arguments were supplied
    if (!$target_language_code || !$translation_file_key) {
        &throw_fatal_error("Missing command argument.");
    }
    
    my %source_files_key_to_text_mapping = ();
    my %target_files_key_to_text_mapping = ();
    my %source_files_key_to_last_update_date_mapping = ();
    my %target_files_key_to_last_update_date_mapping = ();
    
    &build_gs3_configuration($target_language_code, \%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping, 
    \%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);
    

    # Chunks needing updating are those in the target file that have been more recently edited in the source file
    # All others are uptodate (which implies that they have certainly been translated at some point and would not be empty)
    my @uptodate_target_file_keys = ();
    foreach my $chunk_key (keys(%source_files_key_to_last_update_date_mapping)) {
        my $source_chunk_last_update_date = $source_files_key_to_last_update_date_mapping{$chunk_key};
        my $target_chunk_last_update_date = $target_files_key_to_last_update_date_mapping{$chunk_key};
        
        # print "key: $chunk_key\nsource date : $source_chunk_last_update_date\ntarget date : $target_chunk_last_update_date\nafter? ". &is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date) . "\n\n";        
        
        if (defined($target_chunk_last_update_date) && !&is_date_after($source_chunk_last_update_date, $target_chunk_last_update_date)) {
            # &log_message("Chunk with key $chunk_key needs updating.");
            push(@uptodate_target_file_keys, $chunk_key);
        }
    }

    my $xml_response = &create_xml_response_for_uptodate_chunks($translation_file_key, "", \@uptodate_target_file_keys, \%source_files_key_to_text_mapping, \%target_files_key_to_text_mapping, \%source_files_key_to_last_update_date_mapping, \%target_files_key_to_last_update_date_mapping);
    
    return $xml_response;
}


sub build_gs3_configuration
{
    my ($target_language_code, $source_files_key_to_text_mapping, $target_files_key_to_text_mapping,
    $source_files_key_to_gti_comment_or_last_updated_mapping, $target_files_key_to_gti_comment_or_last_updated_mapping, $get_gti_comments_not_last_updated) = @_;
    
    my $source_file_directory = "greenstone3";  # my $source_file_directory = &util::filename_cat("WEB-INF","classes"); 
    my $translation_file_type = "resource_bundle";
    
    foreach my $interface_file_key (@gs3_interface_files) {
        
        &log_message("Greenstone 3 interface file: " . $interface_file_key);
        
        # Parse the source language and target language files
        my $source_file = &util::filename_cat($source_file_directory, $interface_file_key.".properties");
        my @source_file_lines = &read_file_lines(&util::filename_cat($gsdl_root_directory, $source_file));
        my %source_file_key_to_line_mapping = &build_key_to_line_mapping(\@source_file_lines, $translation_file_type);
        my %source_file_key_to_text_mapping = &build_key_to_text_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
        #my %source_file_key_to_gti_comment_mapping = &build_key_to_gti_comment_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);    
        
        my %source_file_key_to_gti_comment_or_last_updated_mapping;
        if($get_gti_comments_not_last_updated) {
            %source_file_key_to_gti_comment_or_last_updated_mapping = &build_key_to_gti_comment_mapping(\@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);    
        } else {
            %source_file_key_to_gti_comment_or_last_updated_mapping = &build_key_to_last_update_date_mapping($source_file, \@source_file_lines, \%source_file_key_to_line_mapping, $translation_file_type);
        }

        my $target_file = &util::filename_cat($source_file_directory, $interface_file_key."_".$target_language_code.".properties");
        my @target_file_lines = &read_file_lines(&util::filename_cat($gsdl_root_directory, $target_file));
        my %target_file_key_to_line_mapping = &build_key_to_line_mapping(\@target_file_lines, $translation_file_type);
        my %target_file_key_to_text_mapping = &build_key_to_text_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
        #my %target_file_key_to_gti_comment_mapping = &build_key_to_gti_comment_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
        
        my %target_file_key_to_gti_comment_or_last_updated_mapping;
        if($get_gti_comments_not_last_updated) {
            %target_file_key_to_gti_comment_or_last_updated_mapping = &build_key_to_gti_comment_mapping(\@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
        } else {
            %target_file_key_to_gti_comment_or_last_updated_mapping = &build_key_to_last_update_date_mapping($target_file, \@target_file_lines, \%target_file_key_to_line_mapping, $translation_file_type);
        }
        
        
        # Filter out any automatically translated chunks
        foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
            if (&is_chunk_automatically_translated($chunk_key, $translation_file_type)) {
                delete $source_file_key_to_line_mapping{$chunk_key};
                delete $target_file_key_to_line_mapping{$chunk_key};
            }
        }
        
        &log_message("Number of source chunks: " . scalar(keys(%source_file_key_to_text_mapping)));
        &log_message("Number of target chunks: " . scalar(keys(%target_file_key_to_text_mapping)));
        
        foreach my $chunk_key (keys(%source_file_key_to_text_mapping)) {
            my $global_chunk_key = "$interface_file_key.$chunk_key";
            $source_files_key_to_text_mapping->{$global_chunk_key} = $source_file_key_to_text_mapping{$chunk_key};
            $source_files_key_to_gti_comment_or_last_updated_mapping->{$global_chunk_key} = $source_file_key_to_gti_comment_or_last_updated_mapping{$chunk_key};
            
            if (defined $target_file_key_to_text_mapping{$chunk_key}) {
                $target_files_key_to_text_mapping->{$global_chunk_key} = $target_file_key_to_text_mapping{$chunk_key};
                $target_files_key_to_gti_comment_or_last_updated_mapping->{$global_chunk_key} = $target_file_key_to_gti_comment_or_last_updated_mapping{$chunk_key};
            }
        }
    }
}


sub write_translated_gs3interface
{
    my $source_file_key_to_text_mapping = shift(@_);
    my $target_file_key_to_text_mapping = shift(@_);
    my $target_file_key_to_gti_comment_mapping = shift(@_);
    my $target_language_code = shift(@_);
    
    my @sorted_chunk_keys = sort (keys(%$source_file_key_to_text_mapping));
    
    my %translated_interface_file_keys = ();
    foreach my $chunk_key (keys(%$target_file_key_to_text_mapping)) {
        $chunk_key =~ /^([^\.]+)?\.(.*)$/;
        if (!defined $translated_interface_file_keys{$1}) {
            &log_message("Updated interface file: " . $1);  
            $translated_interface_file_keys{$1}="";
        }
    }
    &log_message("Updated interface files: " . scalar(keys(%translated_interface_file_keys)));
    
    my $source_file_directory = "greenstone3";    
    
    foreach my $interface_file_key (keys(%translated_interface_file_keys)) {
        
        # Build a mapping from chunk key to source file line, and from source file line to chunk key
        my $source_file = &util::filename_cat($source_file_directory, "$interface_file_key.properties");
        my @source_file_lines = &read_file_lines(&util::filename_cat($gsdl_root_directory, $source_file));
        my %source_file_key_to_line_mapping = &build_key_to_line_mapping_for_resource_bundle(@source_file_lines);
        my %source_file_line_to_key_mapping = ();
        foreach my $chunk_key (keys(%source_file_key_to_line_mapping)) {
            $source_file_line_to_key_mapping{$source_file_key_to_line_mapping{$chunk_key}} = $chunk_key;
        }
        
        # Write the new target file
        my $target_file = &util::filename_cat($source_file_directory, $interface_file_key . "_" . $target_language_code . ".properties");
        my $target_file_path = &util::filename_cat($gsdl_root_directory, $target_file);
        if (!open(TARGET_FILE, ">$target_file_path")) {
            &throw_fatal_error("Could not write target file $target_file_path.");
        }
        
        # Model the new target file on the source file, with the target file translations
        my $source_file_line_number = 0;
        foreach my $line_key (sort sort_by_line (keys(%source_file_line_to_key_mapping))) {
            # Fill in the gaps before this chunk starts
            my $source_file_chunk_starting_line_number = (split(/-/, $line_key))[0];
            my $source_file_chunk_finishing_line_number = (split(/-/, $line_key))[1];
            while ($source_file_line_number < $source_file_chunk_starting_line_number) {
                print TARGET_FILE $source_file_lines[$source_file_line_number];
                $source_file_line_number++;
            }
            $source_file_line_number = $source_file_chunk_finishing_line_number + 1;
            
            my $chunk_key = $source_file_line_to_key_mapping{$line_key};
            my $global_chunk_key = "$interface_file_key.$chunk_key";
            my $source_file_chunk_text = $source_file_key_to_text_mapping->{$global_chunk_key};
            my $target_file_chunk_text = $target_file_key_to_text_mapping->{$global_chunk_key} || "";
            
            # If no translation exists for this chunk, show this, and move on
            if ($source_file_chunk_text ne "" && $target_file_chunk_text eq "") {
                print TARGET_FILE "# -- Missing translation: $chunk_key\n";
                next;
            }
            
            print TARGET_FILE "$chunk_key:$target_file_chunk_text";
            if ($target_file_key_to_gti_comment_mapping->{$global_chunk_key}) {
                print TARGET_FILE "  # " . $target_file_key_to_gti_comment_mapping->{$global_chunk_key};
            }
            print TARGET_FILE "\n";
        }
        
        close(TARGET_FILE); 
    }           
}

&main(@ARGV);