Commandline argument (flag) parsing library for the Myrddin programming language.
Styled after the Inferno arg.m as per https://man.cat-v.org/inferno/2/arg.
The Myrddin programming language: https://myrlang.org
mbld
mbld test
mbld install
mbld
./obj/argsdemo
The args.init() function must be called before any others.
The args.argv() function may be called safely at any time, but is intended to be called after all flags have been parsed.
API reference:
pkg args =
// Must be called first initializes the library
const init : (args : byte[:][:] → void)
// Sets the library usage string
const setusage : (str : byte[:] → void)
// Emits and exits for usage
const usage : (→ void)
// Emits the next flag character in the flag chain
const opt : (→ char)
// Returns the current argument which must not be nil
const earg : (→ byte[:])
// Returns the argv0 of the input, our program name
const progname : (→ byte[:])
// Print remaining arguments
const argv : (→ byte[:][:])
;;
A more complete example exists in demo.myr.
Generic usage of libargs:
const main = {argv : byte[:][:]
args.init(argv)
args.setusage("test [-h] [-n N] name…")
var c
while((c = args.opt()) != (0 : char))
match c
| 'h':
std.put("help!\n")
| 'n':
std.put("N = {}\n", args.earg())
| _:
args.usage()
;;
;;
// Print remaining arguments
for a : args.argv()
std.put("→ {}\n", a)
;;
…
}