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v/vlib/cli/flag.v
2020-04-30 12:18:46 +02:00

130 lines
3.0 KiB
V

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
}