I had to create a little (because boo code tends to be terse) console utility for a customer. The utility had to deal with lots of different command line options, that kind of thing. So I saw it as my opportunity to finally meet Mono.GetOptions.
What a nice tool!

import Mono.GetOptions from Mono.GetOptions

class CommandLineOptions(Options):

    def constructor(argv):
        ProcessArgs(argv)

    [Option("thumbnail width", "width")]
    public Width = 70

    [Option("thumbnail height", "height")]
    public Height = 70

    [Option("output file", "output")]
    public OutputFileName = ""

    [Option("input file", "input")]
    public InputFileName = ""

    [Option("encoding quality level (1-100), default is 75",  "encoding-quality")]
    public EncodingQuality = 75L

    IsValid as bool:
        get:
            return (0 == len(RemainingArguments) and
                        len(OutputFileName) > 0 and
                        len(InputFileName) > 0 and
                        Width > 0 and
                        Height > 0)

options = CommandLineOptions(argv)
if options.IsValid:	
    for field in typeof(CommandLineOptions).GetFields():
        print("${field.Name}: ${field.GetValue(options)}")
else:
    options.DoHelp()

Fire this script with

booi GetOptions.boo

and you'll already see a pretty professional looking help.
My heart would be filled of joy every time I needed to add support for a new parameter :)

Very nice work Rafael!

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