Initial commit for fern

src/builtin/export.rs

@@ -0,0 +1,18 @@
+use crate::prelude::*;
+
+pub fn export(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+	if let NdRule::Command { argv, redirs: _ } = rule {
+		let mut argv_iter = argv.into_iter();
+		argv_iter.next(); // Ignore 'export'
+		while let Some(arg) = argv_iter.next() {
+			let arg_raw = arg.to_string();
+			if let Some((var,val)) = arg_raw.split_once('=') {
+				shenv.vars_mut().export(var, val);
+			} else {
+				eprintln!("Expected an assignment in export args, found this: {}", arg_raw)
+			}
+		}
+	} else { unreachable!() }
+	Ok(())
+}