env: Add Env type and set() and get() functions

env.jk

@@ -0,0 +1,28 @@
+link_with("libc.so.6")
+
+// FIXME: These functions can return NULL, how do we check for this?
+// Do we promote NULL to an empty string? Do we return a Pointer instead?
+ext func getenv(name: string) -> string;
+ext func setenv(name: string, value: string);
+
+type Env(from: string);
+
+func get(env: Env) -> string {
+	getenv(env.from)
+}
+
+func set(env: Env, new_value: string) {
+	setenv(env.from, new_value)
+}
+
+// FIXME: Add assertions
+test get_home() {
+	println(Env(from: "HOME").get())
+}
+
+test set_var() {
+	random_env_var = Env(from: "__jinko_RANDOM_ENV_VAR");
+	random_env_var.set("is_set")
+
+	// random_env_var.get().should_be("is_set")
+}