Initial commit for fern

src/expand/tilde.rs

@@ -0,0 +1,11 @@
+use crate::prelude::*;
+
+pub fn expand_tilde(tilde_sub: Token) -> String {
+	let tilde_sub_raw = tilde_sub.to_string();
+	if tilde_sub_raw.starts_with('~') {
+		let home = std::env::var("HOME").unwrap_or_default();
+		tilde_sub_raw.replacen('~', &home, 1)
+	} else {
+		tilde_sub_raw
+	}
+}