Ticket #748: ArgumentsExample.d

/*******************************************************************************
        Illustrates use of the Arguments class. It shows the
        different ways of defining arguments, and also shows some more
        advanced use by loading arguments from a file using tango.io.

*******************************************************************************/

import tetra.app.Arguments;
import tango.io.Stdout;
import tango.io.FileConduit;
import tango.text.stream.LineIterator;

void main(char[][] cmdl)
{
    char[] helpText = "Available options:\n\t\t-h\tthis help\n\t\t-cool-action\tdo ";
           helpText ~= "cool things to your files\n\t\t-@filename\tuse filename as a response file ";
           helpText ~= "with extra arguments\n\t\tall other arguments are handled as files to do ";
           helpText ~= "cool things with.";

    auto args = new Arguments;
    args.prefixShort = null;
    args.prefixLong = ["-"];
    args.define("X").parameters(0,1);
    args.define("h");
    args.define("@").delimiters([null]).parameters(0,1);
    args.define("@").callback(delegate void(char[] a, char[] p){
                                    if (("@" in args) && (args["@"].length > 1)){
                                        throw new Exception("Only one response file can be given."); }});
    args.define("cool-action");
    args.parse(cmdl[1..$]);
    
    if (("h" in args) || (args.length < 2))
        Stdout(helpText).newline;
    else
    {
        if ("@" in args)
        {
            auto file = new FileConduit(args["@"]);
            auto lines = new LineIterator!(char)(file);
            char[][] arguments;
            foreach(line; lines)
                arguments ~= line;
            args.parse(arguments);
        }
        if ("cool-action" in args)
        {
            Stdout("Listing the files to be actioned in a cool way.").newline;
            for (int i = 1; i <= args.parameters[null].length; i++)
                Stdout.format("{0}. {1}", i, args.parameters[null][i-1]).newline;
            Stdout("Cool and secret action performed.").newline;
        }
        if ("X" in args)
            Stdout.format("User set the X factor to \"{0}\".", args["X"]).newline;
    }    
}