procedure DisplayUsage;

    WriteLn(stdout, 'Usage:');

    WriteLn(stdout, '');

    WriteLn(stdout, '  hwengine <path to user hedgewars folder> <path to global data folder> <path to replay file> [options]');

    WriteLn(stdout, '');

    WriteLn(stdout, 'where [options] are any of the following:');

    WriteLn(stdout, ' --locale [path to language file]');

    WriteLn(stdout, ' --width  [screen width in pixels]');

    WriteLn(stdout, ' --height [screen height in pixels]');

    WriteLn(stdout, ' --depth  [color depth]');

    WriteLn(stdout, ' --volume [sound level]');

    WriteLn(stdout, ' --time   [number of seconds]');

    WriteLn(stdout, ' --nomusic');

    WriteLn(stdout, ' --nosound');

    WriteLn(stdout, ' --fullscreen');

    WriteLn(stdout, ' --showfps');

    WriteLn(stdout, ' --altdmg');

    WriteLn(stdout, ' --lowquality');

    WriteLn(stdout, ' --stats-only');

    WriteLn(stdout, ' --help');

    WriteLn(stdout, '');

    WriteLn(stdout, 'Deprecated options:');

    WriteLn(stdout, ' --set-video [screen width] [screen height] [color dept]');

    WriteLn(stdout, ' --set-audio [volume] [enable music] [enable sounds]');

    WriteLn(stdout, ' --set-other [language file] [full screen] [show FPS]');

    WriteLn(stdout, ' --set-multimedia [screen width] [screen height] [color dept] [volume] [enable music] [enable sounds] [language file] [full screen]');

    WriteLn(stdout, ' --set-everything [screen width] [screen height] [color dept] [volume] [enable music] [enable sounds] [language file] [full screen] [show FPS] [alternate damage] [timer value] [reduced quality]');

    WriteLn(stdout, '');

    WriteLn(stdout, 'For a more detailed help and examples go to:');

    WriteLn(stdout, 'http://code.google.com/p/hedgewars/wiki/CommandLineOptions');

function getLongIntParameter(str:String; var paramIndex:LongInt; var wrongParameter:Boolean): LongInt;

var tmpInt, c: LongInt;

    paramIndex:= paramIndex + 1;

    val(str, tmpInt, c);

    wrongParameter:= c <> 0;

    if wrongParameter then

        WriteLn(stderr, 'ERROR: '+ParamStr(paramIndex-1)+' expects a number, you passed "'+str+'"');

    getLongIntParameter:= tmpInt;

function getStringParameter(str:String; var paramIndex:LongInt): String;

    paramIndex:= paramIndex + 1;

    getStringParameter:= str;

procedure parseClassicParameter(cmdArray: Array of String; size:LongInt; var paramIndex:LongInt); Forward;

function parseParameter(cmd:String; arg:String; var paramIndex:LongInt): Boolean;

const videoArray: Array [1..3] of String = ('--width','--height','--depth');

const audioArray: Array [1..3] of String = ('--volume','--nomusic','--nosound');

const otherArray: Array [1..3] of String = ('--locale','--fullscreen','--showfps');

const mediaArray: Array [1..8] of String = ('--width','--height','--depth','--volume','--nomusic','--nosound','--locale','--fullscreen');

const allArray: Array [1..12] of String = ('--width','--height','--depth','--volume','--nomusic','--nosound','--locale','--fullscreen','--showfps','--altdmg','--time','--lowquality');

    parseParameter:= false;

    case cmd of

        '--locale'     : cLocaleFName   := getStringParameter (arg, paramIndex);

        '--width'      : cScreenWidth   := getLongIntParameter(arg, paramIndex, parseParameter);

        '--height'     : cScreenHeight  := getLongIntParameter(arg, paramIndex, parseParameter);

        '--depth'      : cBits          := getLongIntParameter(arg, paramIndex, parseParameter);

        '--time'       : cTimerInterval := getLongIntParameter(arg, paramIndex, parseParameter);

        '--volume'     : SetVolume       ( getLongIntParameter(arg, paramIndex, parseParameter) );

        '--nomusic'    : SetMusic        ( false );

        '--nosound'    : SetSound        ( false );

        '--fullscreen' : cFullScreen    := true;

        '--showfps'    : cShowFPS       := true;

        '--altdmg'     : cAltDamage     := true;

        '--lowquality' : cReducedQuality:= ($FFFFFFFF * getLongIntParameter(arg, paramIndex, parseParameter)) xor rqLowRes; //HACK!

        '--set-video'      : parseClassicParameter(videoArray,3,paramIndex);

        '--set-audio'      : parseClassicParameter(audioArray,3,paramIndex);

        '--set-other'      : parseClassicParameter(otherArray,3,paramIndex);

        '--set-multimedia' : parseClassicParameter(mediaArray,8,paramIndex);

        '--set-everything' : parseClassicParameter(allArray,12,paramIndex);

        '--stats-only' : begin

                         cOnlyStats:= true;

                         SetSound(false);

                         SetMusic(false);

                         cReducedQuality:= $FFFFFFFF xor rqLowRes;

                         end;

        '--gci' : begin            //     We had to make up all this saved space some how...     \\

                  WriteLn(stdout, '                                                                ');

                  WriteLn(stdout, '      /\\\\\\\\\\\\        /\\\\\\\\\  /\\\\\\\\\\\             ');

                  WriteLn(stdout, '     /\\\//////////      /\\\////////  \/////\\\///             ');

                  WriteLn(stdout, '     /\\\               /\\\/               \/\\\               ');

                  WriteLn(stdout, '     \/\\\    /\\\\\\\  /\\\                 \/\\\              ');

                  WriteLn(stdout, '      \/\\\   \/////\\\ \/\\\                 \/\\\             ');

                  WriteLn(stdout, '       \/\\\       \/\\\ \//\\\                \/\\\            ');

                  WriteLn(stdout, '        \/\\\       \/\\\  \///\\\              \/\\\           ');

                  WriteLn(stdout, '         \//\\\\\\\\\\\\/     \////\\\\\\\\\  /\\\\\\\\\\\      ');

                  WriteLn(stdout, '          \////////////           \/////////  \///////////      ');

                  WriteLn(stdout, '                                                                ');

                  WriteLn(stdout, ' Command Line Parser Implementation by a Google Code-In Student ');

                  WriteLn(stdout, '             ASCII Art easter egg idea by @sheepluva            ');

                  WriteLn(stdout, '                                                                ');

                  end;

        '--help' : begin

                   DisplayUsage();

                   GameType:= gmtSyntax;

                   end;

    else

        begin

        WriteLn(stderr, 'ERROR: '+cmd+' is not a valid argument');

        parseParameter:= true;

        end

    end;

procedure parseClassicParameter(cmdArray: Array of String; size:LongInt; var paramIndex:LongInt);

var index, tmpInt: LongInt;

    isBool: Boolean;

    index:= 0;

    tmpInt:= 1;

    while (index < size) do

        begin

        paramIndex:= paramIndex+1;

        //This next line is a really strange (but short), way to check if the parameter is a boolean one

        isBool:= true; case cmdArray[index] of '--nomusic':;'--nosound':;'--fullscreen':;'--showfps':;'--altdmg':;'--lowquality':; else isBool:= false; end;

        if (not isBool) or ((ParamStr(paramIndex)='1') and (cmdArray[index]<>'--nomusic') and (cmdArray[index]<>'--nosound')) then

            parseParameter(cmdArray[index], ParamStr(paramIndex), tmpInt);

        //if isBool then

        //  paramIndex:= paramIndex+1;

        index:= index+1;

        end;

var paramIndex, tmpInt: LongInt;

    while (paramIndex <= ParamCount) do

        if parseParameter( ParamStr(paramIndex), ParamStr(paramIndex+1), paramIndex) then

            wrongParameter:= true;

        paramIndex:= paramIndex+1;

        end;

    if wrongParameter = true then

        begin

        WriteLn(stderr, 'Please use --help to see possible arguments and their usage');

        GameType:= gmtSyntax;

        end