module cli pub enum FlagType { bool int float string } pub struct Flag { pub mut: flag FlagType name string abbrev string description string global bool required bool value string } pub fn (flags []Flag) get_bool(name string) ?bool { flag := flags.get(name) or { return error(err) } if flag.flag != .bool { return error('invalid flag type') } return flag.value == 'true' } pub fn (flags []Flag) get_bool_or(name string, or_value bool) bool { value := flags.get_bool(name) or { return or_value } return value } pub fn (flags []Flag) get_int(name string) ?int { flag := flags.get(name) or { return error(err) } if flag.flag != .int { return error('invalid flag type') } return flag.value.int() } pub fn (flags []Flag) get_int_or(name string, or_value int) int { value := flags.get_int(name) or { return or_value } return value } pub fn (flags []Flag) get_float(name string) ?f32 { flag := flags.get(name) or { return error(err) } if flag.flag != .float { return error('invalid flag type') } return flag.value.f32() } pub fn (flags []Flag) get_float_or(name string, or_value f32) f32 { value := flags.get_float(name) or { return or_value } return value } pub fn (flags []Flag) get_string(name string) ?string { flag := flags.get(name) or { return error(err) } if flag.flag != .string { return error('invalid flag type') } return flag.value } pub fn (flags []Flag) get_string_or(name string, or_value string) string { value := flags.get_string(name) or { return or_value } return value } // parse flag value from arguments and return arguments with all consumed element removed fn (flag mut Flag) parse(args []string) ?[]string { if flag.matches(args) { if flag.flag == .bool { new_args := flag.parse_bool(args) or { return error(err) } return new_args } else { new_args := flag.parse_raw(args) or { return error(err) } return new_args } } else { return args } } // check if first arg matches flag fn (flag &Flag) matches(args []string) bool { return (flag.name != '' && args[0].starts_with('--${flag.name}')) || (flag.abbrev != '' && args[0].starts_with('-${flag.abbrev}')) } fn (flag mut Flag) parse_raw(args []string) ?[]string { if args[0].len > flag.name.len && args[0].contains('=') { flag.value = args[0].split('=')[1] return args[1..] } else if args.len >= 2 { flag.value = args[1] return args[2..] } return error('missing argument for ${flag.name}') } fn (flag mut Flag) parse_bool(args []string) ?[]string { if args[0].len > flag.name.len && args[0].contains('=') { flag.value = args[0].split('=')[1] return args[1..] } else if args.len >= 2 { if args[1] in ['true', 'false'] { flag.value = args[1] return args[2..] } } flag.value = 'true' return args[1..] } fn (flags []Flag) get(name string) ?Flag { for flag in flags { if flag.name == name { return flag } } return error('flag ${name} not found.') } fn (flags []Flag) contains(name string) bool { for flag in flags { if flag.name == name || flag.abbrev == name { return true } } return false }