Hi,

I have written a simple commandline option parser .

usage:

class OptParserTest: OptParser
{
    @optname=["b"]
    Bool myBool

    @optname=["i", "myint"]
    Int myInt := 42

    @optname=["f", "myfloat"]
    Float myFloat
}

class Main
{
    Void main(Str[] args) {
        optParseTest := OptParserTest()._parse(args)
        echo("myBool == " + optParseTest.myBool)
        echo("myInt == " + optParseTest.myInt)
        echo("myFloat == " + optParseTest.myFloat)
        echo("_args == " + optParseTest._args)
    }
}

output:

% fan optparse.fan -b --myfloat 13.37 -- foo bar
myBool == true
myInt == 42
myFloat == 13.37
_args == [foo, bar]

This is the first time I used reflection feature in any programming language, and it is fan! Hopefully some of you may find it useful.

You can simplify the interface to:

class OptParserTest: OptParser
{
    Bool myBool

    Int myInt := 42

    Float myFloat
}

Just use reflection to determine the slot name (and maybe toLowerCase it) and the slot type.

Though, if i'm reading you right, that assumes that every field on the the object then would have a configuration flag which might not be what's wanted in every case. Thanks for writing this Dubhead. I had one kinda half done from some python porting I'd done a while back and had always intended to round it out. Now perhaps I won't have to.