shithub: mc

ref: a832e3d49570feddfe89fc31f3c08f73126fa04e
dir: /lib/std/env+plan9.myr/

use sys

use "alloc"
use "die"
use "extremum"
use "fmt"
use "option"
use "result"
use "slcp"
use "sldup"
use "sleq"
use "slpush"
use "slurp"
use "cstrconv"

pkg std =
	const getenv :	(name : byte[:] -> option(byte[:]))
	const getenvv :	(name : byte[:], default : byte[:] -> byte[:])
;;

var envkey 	: byte[:][:]
var envval	: byte[:][:]

const envfind = {key
	for var i = 0; i < envkey.len; i++
		if std.sleq(envkey[i], key)
			-> `Some envval[i]
		;;
	;;
	-> `None
}

const getenv = {name
	var buf : byte[128]
	var s

	match envfind(name)
	| `Some val:	-> `Some val
	| `None:
		s = bfmt(buf[:], "/env/{}", name)
		match std.slurp(s)
		| `Fail m: -> `None
		| `Ok data:
			data = cstrconv(data)
			slpush(&envkey, sldup(data))
			slpush(&envval, data)
			-> `Some data
		;;
	;;
}

const getenvv = {name, default
	match getenv(name)
	| `Some val:	-> val
	| `None:	-> default
	;;
}