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52 years ago
..

Description:

The flag module is a command line option parser. Its main features are:

See also the cli module, for a more complex command line option parser, that supports declaring multiple subcommands each having a separate set of options.

Usage example:

module main

import os
import flag

fn main() {
    mut fp := flag.new_flag_parser(os.args)
    fp.application('flag_example_tool')
    fp.version('v0.0.1')
    fp.limit_free_args(0, 0)? // comment this, if you expect arbitrary texts after the options
    fp.description('This tool is only designed to show how the flag lib is working')
    fp.skip_executable()
    an_int := fp.int('an_int', 0, 0o123, 'some int to define 0o123 is its default value')
    a_bool := fp.bool('a_bool', 0, false, 'some boolean flag. --a_bool will set it to true.')
    a_float := fp.float('a_float', 0, 1.0, 'some floating point value, by default 1.0 .')
    a_string := fp.string('a_string', `a`, 'no text', 'finally, some text with ' +
        ' `-a` as an abbreviation, so you can pass --a_string abc or just -a abc')
    additional_args := fp.finalize() or {
        eprintln(err)
        println(fp.usage())
        return
    }
    println('an_int: $an_int | a_bool: $a_bool | a_float: $a_float | a_string: "$a_string" ')
    println(additional_args.join_lines())
}