Early implementation of scripting elements

src/expand/vars.rs

@@ -0,0 +1,67 @@
+use crate::{parse::lex::Token, prelude::*};
+
+pub fn expand_var(var_sub: Token, shenv: &mut ShEnv) -> Vec<Token> {
+	let var_name = var_sub.as_raw(shenv);
+	let var_name = var_name.trim_start_matches('$').trim_matches(['{','}']);
+	let value = shenv.vars().get_var(var_name).to_string();
+
+	shenv.expand_input(&value, var_sub.span())
+}
+
+pub fn expand_dquote(dquote: Token, shenv: &mut ShEnv) -> Token {
+	let dquote_raw = dquote.as_raw(shenv);
+	let mut result = String::new();
+	let mut var_name = String::new();
+	let mut chars = dquote_raw.chars().peekable();
+	let mut in_brace = false;
+
+	while let Some(ch) = chars.next() {
+		match ch {
+			'\\' => {
+				if let Some(next_ch) = chars.next() {
+					result.push(next_ch)
+				}
+			}
+			'$' => {
+				while let Some(ch) = chars.peek() {
+					if *ch == '"' {
+						break
+					}
+					let ch = chars.next().unwrap();
+					match ch {
+						'{' => {
+							in_brace = true;
+						}
+						'}' if in_brace => {
+							break
+						}
+						_ if ch.is_ascii_digit() && var_name.is_empty() && !in_brace => {
+							var_name.push(ch);
+							break
+						}
+						'@' | '#' | '*' | '-' | '?' | '!' | '$' if var_name.is_empty() => {
+							var_name.push(ch);
+							break
+						}
+						' ' | '\t' => {
+							break
+						}
+						_ => var_name.push(ch)
+					}
+				}
+				log!(TRACE, var_name);
+				let value = shenv.vars().get_var(&var_name);
+				log!(TRACE, value);
+				result.push_str(value);
+			}
+			_ => result.push(ch)
+		}
+	}
+
+	log!(DEBUG, result);
+
+	log!(DEBUG, "{:?}",dquote.span());
+	let token = shenv.expand_input(&result, dquote.span()).pop().unwrap_or(dquote);
+	log!(DEBUG, "{}",token.as_raw(shenv));
+	token
+}