shithub: mc

ref: df39695ef7997e8cfb4bb3e00976c4689edb15f5
dir: /lib/std/env+plan9.myr/

View raw version
use sys

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

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)
			envkey = slpush(envkey, sldup(data))
			envval = slpush(envval, data)
			-> `Some data
		;;
	;;
}

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