Implemented functions and aliases

src/builtin/alias.rs

@@ -0,0 +1,19 @@
+use crate::prelude::*;
+
+pub fn alias(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+	if let NdRule::Command { argv, redirs: _ } = rule {
+		let argv = argv.drop_first();
+		let mut argv_iter = argv.into_iter();
+		while let Some(arg) = argv_iter.next() {
+			let arg_raw = arg.to_string();
+			if let Some((alias,body)) = arg_raw.split_once('=') {
+				let clean_body = trim_quotes(&body);
+				shenv.logic_mut().set_alias(alias, &clean_body);
+			} else {
+				return Err(ShErr::full(ShErrKind::SyntaxErr, "Expected an assignment in alias args", arg.span().clone()))
+			}
+		}
+	} else { unreachable!() }
+	Ok(())
+}

src/builtin/jobctl.rs

@@ -22,7 +22,7 @@ pub fn continue_job(node: Node, shenv: &mut ShEnv, fg: bool) -> ShResult<()> {
 		let curr_job_id = if let Some(id) = read_jobs(|j| j.curr_job()) {
 			id
 		} else {
-			return Err(ShErr::full(ShErrKind::ExecFail, "No jobs found".into(), blame))
+			return Err(ShErr::full(ShErrKind::ExecFail, "No jobs found", blame))
 		};
 
 		let tabid = match argv_s.next() {
@@ -66,7 +66,7 @@ fn parse_job_id(arg: &str, blame: Span) -> ShResult<usize> {
 			});
 			match result {
 				Some(id) => Ok(id),
-				None => Err(ShErr::full(ShErrKind::InternalErr,"Found a job but no table id in parse_job_id()".into(),blame))
+				None => Err(ShErr::full(ShErrKind::InternalErr,"Found a job but no table id in parse_job_id()",blame))
 			}
 		}
 	} else if arg.chars().all(|ch| ch.is_ascii_digit()) {
@@ -86,7 +86,7 @@ fn parse_job_id(arg: &str, blame: Span) -> ShResult<usize> {
 
 		match result {
 			Some(id) => Ok(id),
-			None => Err(ShErr::full(ShErrKind::InternalErr,"Found a job but no table id in parse_job_id()".into(),blame))
+			None => Err(ShErr::full(ShErrKind::InternalErr,"Found a job but no table id in parse_job_id()",blame))
 		}
 	} else {
 		Err(ShErr::full(ShErrKind::SyntaxErr,format!("Invalid fd arg: {}", arg),blame))
@@ -103,7 +103,7 @@ pub fn jobs(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 			let arg_s = arg.to_string();
 			let mut chars = arg_s.chars().peekable();
 			if chars.peek().is_none_or(|ch| *ch != '-') {
-				return Err(ShErr::full(ShErrKind::SyntaxErr, "Invalid flag in jobs call".into(), arg.span().clone()))
+				return Err(ShErr::full(ShErrKind::SyntaxErr, "Invalid flag in jobs call", arg.span().clone()))
 			}
 			chars.next();
 			while let Some(ch) = chars.next() {
@@ -113,7 +113,7 @@ pub fn jobs(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 					'n' => JobCmdFlags::NEW_ONLY,
 					'r' => JobCmdFlags::RUNNING,
 					's' => JobCmdFlags::STOPPED,
-					_ => return Err(ShErr::full(ShErrKind::SyntaxErr, "Invalid flag in jobs call".into(), arg.span().clone()))
+					_ => return Err(ShErr::full(ShErrKind::SyntaxErr, "Invalid flag in jobs call", arg.span().clone()))
 
 				};
 				flags |= flag

src/builtin/mod.rs

@@ -4,8 +4,9 @@ pub mod pwd;
 pub mod export;
 pub mod jobctl;
 pub mod read;
+pub mod alias;
 
-pub const BUILTINS: [&str;8] = [
+pub const BUILTINS: [&str;9] = [
 	"echo",
 	"cd",
 	"pwd",
@@ -13,5 +14,6 @@ pub const BUILTINS: [&str;8] = [
 	"fg",
 	"bg",
 	"jobs",
-	"read"
+	"read",
+	"alias"
 ];

src/execute.rs

@@ -47,9 +47,9 @@ fn exec_list(list: Vec<(Option<CmdGuard>, Node)>, shenv: &mut ShEnv) -> ShResult
 		}
 		log!(TRACE, "{:?}", *cmd.rule());
 		match *cmd.rule() {
-			NdRule::Command {..} if cmd.flags().contains(NdFlag::BUILTIN) => exec_builtin(cmd,shenv).try_blame(span)?,
-			NdRule::Command {..} => exec_cmd(cmd,shenv).try_blame(span)?,
+			NdRule::Command {..} => dispatch_command(cmd, shenv).try_blame(span)?,
 			NdRule::Subshell {..} => exec_subshell(cmd,shenv).try_blame(span)?,
+			NdRule::FuncDef {..} => exec_funcdef(cmd,shenv).try_blame(span)?,
 			NdRule::Assignment {..} => exec_assignment(cmd,shenv).try_blame(span)?,
 			NdRule::Pipeline {..} => exec_pipeline(cmd, shenv).try_blame(span)?,
 			_ => unimplemented!()
@@ -58,6 +58,83 @@ fn exec_list(list: Vec<(Option<CmdGuard>, Node)>, shenv: &mut ShEnv) -> ShResult
 	Ok(())
 }
 
+fn dispatch_command(mut node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let mut is_builtin = false;
+	let mut is_func = false;
+	let mut is_subsh = false;
+	if let NdRule::Command { ref mut argv, redirs: _ } = node.rule_mut() {
+		*argv = expand_argv(argv.to_vec(), shenv);
+		let cmd = argv.first().unwrap().to_string();
+		if shenv.logic().get_function(&cmd).is_some() {
+			is_func = true;
+		} else if node.flags().contains(NdFlag::BUILTIN) {
+			is_builtin = true;
+		}
+	} else if let NdRule::Subshell { body: _, ref mut argv, redirs: _ } = node.rule_mut() {
+		*argv = expand_argv(argv.to_vec(), shenv);
+		is_subsh = true;
+	} else { unreachable!() }
+
+	if is_builtin {
+		exec_builtin(node, shenv)?;
+	} else if is_func {
+		exec_func(node, shenv)?;
+	} else if is_subsh {
+		exec_subshell(node, shenv)?;
+	} else {
+		exec_cmd(node, shenv)?;
+	}
+	Ok(())
+}
+
+fn exec_func(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();
+		let func_name = argv_iter.next().unwrap().to_string();
+		let body = shenv.logic().get_function(&func_name).unwrap().to_string();
+		let snapshot = shenv.clone();
+		shenv.vars_mut().reset_params();
+		while let Some(arg) = argv_iter.next() {
+			shenv.vars_mut().bpush_arg(&arg.to_string());
+		}
+		shenv.collect_redirs(redirs);
+
+		let lex_input = Rc::new(body);
+		let tokens = Lexer::new(lex_input).lex();
+		match Parser::new(tokens).parse() {
+			Ok(syn_tree) => {
+				match Executor::new(syn_tree, shenv).walk() {
+					Ok(_) => { /* yippee */ }
+					Err(e) => {
+						*shenv = snapshot;
+						return Err(e.into())
+					}
+				}
+			}
+			Err(e) => {
+				*shenv = snapshot;
+				return Err(e.into())
+			}
+		}
+		*shenv = snapshot;
+	}
+	Ok(())
+}
+
+fn exec_funcdef(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+	if let NdRule::FuncDef { name, body } = rule {
+		let name_raw = name.to_string();
+		let name = name_raw.trim_end_matches("()");
+		let body_raw = body.to_string();
+		let body = body_raw[1..body_raw.len() - 1].trim();
+
+		shenv.logic_mut().set_function(name, body);
+	} else { unreachable!() }
+	Ok(())
+}
+
 fn exec_subshell(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 	let snapshot = shenv.clone();
 	shenv.vars_mut().reset_params();
@@ -154,6 +231,7 @@ fn exec_builtin(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 		"fg" => continue_job(node, shenv, true)?,
 		"bg" => continue_job(node, shenv, false)?,
 		"read" => read_builtin(node, shenv)?,
+		"alias" => alias(node, shenv)?,
 		_ => unimplemented!("Have not yet implemented support for builtin `{}'",command)
 	}
 	log!(TRACE, "done");
@@ -212,6 +290,8 @@ fn exec_pipeline(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 			if let NdRule::Command { argv, redirs: _ } = cmd.rule() {
 				let cmd_name = argv.first().unwrap().span().get_slice().to_string();
 				cmd_names.push(cmd_name);
+			} else if let NdRule::Subshell {..} = cmd.rule() {
+				cmd_names.push("subshell".to_string());
 			} else { unimplemented!() }
 
 			match unsafe { fork()? } {
@@ -234,11 +314,7 @@ fn exec_pipeline(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 						shenv.ctx_mut().push_rdr(rpipe_redir);
 					}
 
-					if cmd.flags().contains(NdFlag::BUILTIN) {
-						exec_builtin(cmd, shenv).unwrap();
-					} else {
-						exec_cmd(cmd, shenv).unwrap();
-					}
+					dispatch_command(cmd, shenv)?;
 					exit(0);
 				}
 				Parent { child } => {

src/expand/alias.rs

@@ -0,0 +1,75 @@
+use crate::{parse::lex::SEPARATORS, prelude::*};
+
+pub fn expand_aliases(input: &str, shenv: &mut ShEnv) -> Option<String> {
+	let mut result = input.to_string();
+	let mut expanded_aliases = Vec::new();
+	let mut found_in_iteration = true;
+
+	// Loop until no new alias expansion happens.
+	while found_in_iteration {
+		found_in_iteration = false;
+		let mut new_result = String::new();
+		let mut chars = result.chars().peekable();
+		let mut alias_cand = String::new();
+		let mut is_cmd = true;
+
+		while let Some(ch) = chars.next() {
+			match ch {
+				';' | '\n' => {
+					new_result.push(ch);
+					is_cmd = true;
+					// Consume any extra whitespace or delimiters.
+					while let Some(&next_ch) = chars.peek() {
+						if matches!(next_ch, ' ' | '\t' | ';' | '\n') {
+							new_result.push(next_ch);
+							chars.next();
+						} else {
+							break;
+						}
+					}
+				}
+				' ' | '\t' => {
+					is_cmd = false;
+					new_result.push(ch);
+				}
+				_ if is_cmd => {
+					// Accumulate token characters.
+					alias_cand.push(ch);
+					while let Some(&next_ch) = chars.peek() {
+						if matches!(next_ch, ' ' | '\t' | ';' | '\n') {
+							break;
+						} else {
+							alias_cand.push(next_ch);
+							chars.next();
+						}
+					}
+					// Check for an alias expansion.
+					if let Some(alias) = shenv.logic().get_alias(&alias_cand) {
+						// Only expand if we haven't already done so.
+						if !expanded_aliases.contains(&alias_cand) {
+							new_result.push_str(alias);
+							expanded_aliases.push(alias_cand.clone());
+							found_in_iteration = true;
+						} else {
+							new_result.push_str(&alias_cand);
+						}
+					} else {
+						new_result.push_str(&alias_cand);
+					}
+					alias_cand.clear();
+				}
+				_ => {
+					new_result.push(ch);
+				}
+			}
+		}
+		result = new_result;
+		log!(DEBUG, result);
+	}
+
+	if expanded_aliases.is_empty() {
+		None
+	} else {
+		Some(result)
+	}
+}

src/expand/expand_vars.rs

@@ -11,11 +11,11 @@ pub fn expand_var(var_sub: Token, shenv: &mut ShEnv) -> Vec<Token> {
 	Lexer::new(value).lex() // Automatically handles word splitting for us
 }
 
-pub fn expand_dquote(dquote: Token, shenv: &mut ShEnv) -> String {
+pub fn expand_dquote(dquote: Token, shenv: &mut ShEnv) -> Token {
 	let dquote_raw = dquote.to_string();
 	let mut result = String::new();
 	let mut var_name = String::new();
-	let mut chars = dquote_raw.chars();
+	let mut chars = dquote_raw.chars().peekable();
 	let mut in_brace = false;
 
 	while let Some(ch) = chars.next() {
@@ -25,11 +25,13 @@ pub fn expand_dquote(dquote: Token, shenv: &mut ShEnv) -> String {
 					result.push(next_ch)
 				}
 			}
-			'"' => continue,
 			'$' => {
-				while let Some(ch) = chars.next() {
+				while let Some(ch) = chars.peek() {
+					if *ch == '"' {
+						break
+					}
+					let ch = chars.next().unwrap();
 					match ch {
-						'"' => continue,
 						'{' => {
 							in_brace = true;
 						}
@@ -59,5 +61,7 @@ pub fn expand_dquote(dquote: Token, shenv: &mut ShEnv) -> String {
 		}
 	}
 
-	result
+	log!(DEBUG, result);
+
+	Lexer::new(Rc::new(result)).lex().pop().unwrap_or(dquote)
 }

src/expand/mod.rs

@@ -1,2 +1,38 @@
 pub mod expand_vars;
 pub mod tilde;
+pub mod alias;
+
+use alias::expand_aliases;
+use expand_vars::{expand_dquote, expand_var};
+use tilde::expand_tilde;
+
+use crate::prelude::*;
+
+pub fn expand_argv(argv: Vec<Token>, shenv: &mut ShEnv) -> Vec<Token> {
+	let mut processed = vec![];
+	for arg in argv {
+		log!(DEBUG, arg);
+		log!(DEBUG, processed);
+		match arg.rule() {
+			TkRule::DQuote => {
+				let dquote_exp = expand_dquote(arg.clone(), shenv);
+				processed.push(dquote_exp);
+			}
+			TkRule::VarSub => {
+				let mut varsub_exp = expand_var(arg.clone(), shenv);
+				processed.append(&mut varsub_exp);
+			}
+			TkRule::TildeSub => {
+				let tilde_exp = expand_tilde(arg.clone());
+				processed.push(tilde_exp);
+			}
+			_ => {
+				if arg.rule() != TkRule::Ident {
+					log!(WARN, "found this in expand_argv: {:?}", arg.rule());
+				}
+				processed.push(arg.clone())
+			}
+		}
+	}
+	processed
+}

src/expand/tilde.rs

@@ -1,11 +1,14 @@
 use crate::prelude::*;
 
-pub fn expand_tilde(tilde_sub: Token) -> String {
+pub fn expand_tilde(tilde_sub: Token) -> Token {
 	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)
+		tilde_sub_raw.replacen('~', &home, 1);
+		let lex_input = Rc::new(tilde_sub_raw);
+		let mut tokens = Lexer::new(lex_input).lex();
+		tokens.pop().unwrap_or(tilde_sub)
 	} else {
-		tilde_sub_raw
+		tilde_sub
 	}
 }

src/libsh/error.rs

@@ -89,14 +89,14 @@ pub enum ShErr {
 }
 
 impl ShErr {
-	pub fn simple(kind: ShErrKind, message: &str) -> Self {
-		Self::Simple { kind, message: message.to_string() }
+	pub fn simple<S: Into<String>>(kind: ShErrKind, message: S) -> Self {
+		Self::Simple { kind, message: message.into() }
 	}
 	pub fn io() -> Self {
 		io::Error::last_os_error().into()
 	}
-	pub fn full(kind: ShErrKind, message: String, span: Span) -> Self {
-		Self::Full { kind, message, span }
+	pub fn full<S: Into<String>>(kind: ShErrKind, message: S, span: Span) -> Self {
+		Self::Full { kind, message: message.into(), span }
 	}
 	pub fn try_blame(&mut self, blame: Span) {
 		match self {
@@ -178,7 +178,7 @@ impl Display for ShErr {
 				let dist = span.end() - span.start();
 				let padding = " ".repeat(offset);
 				let line_inner = "~".repeat(dist.saturating_sub(2));
-				let err_kind = style_text(&self.display_kind(), Style::Red | Style::Bold);
+				let err_kind = &self.display_kind().styled(Style::Red | Style::Bold);
 				let stat_line = format!("[{}:{}] - {}{}",line_no,offset,err_kind,message);
 				let indicator_line = if dist == 1 {
 					format!("{}^",padding)

src/libsh/utils.rs

@@ -5,8 +5,19 @@ use nix::libc::getpgrp;
 
 use crate::{expand::{expand_vars::{expand_dquote, expand_var}, tilde::expand_tilde}, prelude::*};
 
+use super::term::StyleSet;
+
 pub trait StrOps {
-	fn trim_quotes(&self) -> String;
+	/// This function operates on anything that implements `AsRef<str>` and `Display`, which is mainly strings.
+	/// It takes a 'Style' which can be passed as a single Style object like `Style::Cyan` or a Bit OR of many styles,
+	/// For instance: `Style::Red | Style::Bold | Style::Italic`
+	fn styled<S: Into<StyleSet>>(self, style: S) -> String;
+}
+
+impl<T: AsRef<str> + Display> StrOps for T {
+	fn styled<S: Into<StyleSet>>(self, style: S) -> String {
+		style_text(&self, style)
+	}
 }
 
 pub trait ArgVec {
@@ -16,30 +27,12 @@ pub trait ArgVec {
 
 impl ArgVec for Vec<Token> {
 	/// Converts the contained tokens into strings.
-	/// This function also performs token expansion.
 	fn as_strings(self, shenv: &mut ShEnv) -> Vec<String> {
 		let mut argv_iter = self.into_iter();
 		let mut argv_processed = vec![];
 		while let Some(arg) = argv_iter.next() {
-			match arg.rule() {
-				TkRule::VarSub => {
-					let mut tokens = expand_var(arg, shenv).into_iter();
-					while let Some(token) = tokens.next() {
-						argv_processed.push(token.to_string())
-					}
-				}
-				TkRule::TildeSub => {
-					let expanded = expand_tilde(arg);
-					argv_processed.push(expanded);
-				}
-				TkRule::DQuote => {
-					let expanded = expand_dquote(arg, shenv);
-					argv_processed.push(expanded)
-				}
-				_ => {
-					argv_processed.push(arg.to_string())
-				}
-			}
+			let cleaned = trim_quotes(&arg);
+			argv_processed.push(cleaned);
 		}
 		argv_processed
 	}
@@ -72,11 +65,11 @@ pub enum LogLevel {
 impl Display for LogLevel {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		match self {
-			ERROR => write!(f,"{}",style_text("ERROR", Style::Red | Style::Bold)),
-			WARN => write!(f,"{}",style_text("WARN", Style::Yellow | Style::Bold)),
-			INFO => write!(f,"{}",style_text("INFO", Style::Green | Style::Bold)),
-			DEBUG => write!(f,"{}",style_text("DEBUG", Style::Magenta | Style::Bold)),
-			TRACE => write!(f,"{}",style_text("TRACE", Style::Blue | Style::Bold)),
+			ERROR => write!(f,"{}","ERROR".styled(Style::Red | Style::Bold)),
+			WARN => write!(f,"{}","WARN".styled(Style::Yellow | Style::Bold)),
+			INFO => write!(f,"{}","INFO".styled(Style::Green | Style::Bold)),
+			DEBUG => write!(f,"{}","DEBUG".styled(Style::Magenta | Style::Bold)),
+			TRACE => write!(f,"{}","TRACE".styled(Style::Blue | Style::Bold)),
 			NULL => write!(f,"")
 		}
 	}
@@ -89,9 +82,9 @@ macro_rules! log {
 			let var_name = stringify!($var);
 			if $level <= log_level() {
 				let file = file!();
-				let file_styled = style_text(file,Style::Cyan);
+				let file_styled = file.styled(Style::Cyan);
 				let line = line!();
-				let line_styled = style_text(line,Style::Cyan);
+				let line_styled = line.to_string().styled(Style::Cyan);
 				let logged = format!("[{}][{}:{}] {} = {:#?}",$level, file_styled,line_styled,var_name, &$var);
 
 				write(borrow_fd(2),format!("{}\n",logged).as_bytes()).unwrap();
@@ -102,9 +95,9 @@ macro_rules! log {
 	($level:expr, $lit:literal) => {{
 		if $level <= log_level() {
 			let file = file!();
-			let file_styled = style_text(file, Style::Cyan);
+			let file_styled = file.styled(Style::Cyan);
 			let line = line!();
-			let line_styled = style_text(line, Style::Cyan);
+			let line_styled = line.to_string().styled(Style::Cyan);
 			let logged = format!("[{}][{}:{}] {}", $level, file_styled, line_styled, $lit);
 			write(borrow_fd(2), format!("{}\n", logged).as_bytes()).unwrap();
 		}
@@ -114,9 +107,9 @@ macro_rules! log {
 		if $level <= log_level() {
 			let formatted = format!($($arg)*);
 			let file = file!();
-			let file_styled = style_text(file, Style::Cyan);
+			let file_styled = file.styled(Style::Cyan);
 			let line = line!();
-			let line_styled = style_text(line, Style::Cyan);
+			let line_styled = line.to_string().styled(Style::Cyan);
 			let logged = format!("[{}][{}:{}] {}", $level, file_styled, line_styled, formatted);
 			write(borrow_fd(2), format!("{}\n", logged).as_bytes()).unwrap();
 		}

src/main.rs

@@ -22,16 +22,21 @@ pub fn main() {
 
 	loop {
 		log!(TRACE, "Entered loop");
-		let line = match prompt::read_line(&mut shenv) {
+		let mut line = match prompt::read_line(&mut shenv) {
 			Ok(line) => line,
 			Err(e) => {
 				eprintln!("{}",e);
 				continue;
 			}
 		};
+		if let Some(line_exp) = expand_aliases(&line, &mut shenv) {
+			line = line_exp;
+		}
 		let input = Rc::new(line);
 		log!(INFO, "New input: {:?}", input);
 		let token_stream = Lexer::new(input).lex();
+		log!(DEBUG, token_stream);
+		log!(DEBUG, token_stream);
 		log!(TRACE, "Token stream: {:?}", token_stream);
 		match Parser::new(token_stream).parse() {
 			Err(e) => {

src/parse/lex.rs

@@ -1,4 +1,4 @@
-use std::fmt::Display;
+use std::fmt::{Debug, Display};
 
 use crate::prelude::*;
 
@@ -74,7 +74,7 @@ impl Lexer {
 	}
 }
 
-#[derive(Debug,Clone)]
+#[derive(Clone)]
 pub struct Token {
 	rule: TkRule,
 	span: Span
@@ -98,6 +98,13 @@ impl Token {
 	}
 }
 
+impl Debug for Token {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		let info = (self.rule(),self.to_string(),self.span.start,self.span.end);
+		write!(f,"{:?}",info)
+	}
+}
+
 impl Display for Token {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		let slice = self.span.get_slice();
@@ -462,7 +469,7 @@ tkrule_def!(DQuote, |input: &str| {
 	// Double quoted strings
 	let mut chars = input.chars();
 	let mut len = 0;
-	let mut quoted = false;
+	let mut quote_count = 0;
 
 	while let Some(ch) = chars.next() {
 		match ch {
@@ -470,21 +477,38 @@ tkrule_def!(DQuote, |input: &str| {
 				chars.next();
 				len += 2;
 			}
-			'"' if !quoted => {
+			'"' => {
 				len += 1;
-				quoted = true;
+				quote_count += 1;
 			}
-			'"' if quoted => {
-				len += 1;
-				return Some(len)
-			}
-			_ if !quoted => {
-				return None
+			' ' | '\t' | ';' | '\n' if quote_count % 2 == 0 => {
+				if quote_count > 0 {
+					if quote_count % 2 == 0 {
+						return Some(len)
+					} else {
+						return None
+					}
+				} else {
+					return None
+				}
 			}
 			_ => len += 1
 		}
 	}
-	None
+	match len {
+		0 => None,
+		_ => {
+			if quote_count > 0 {
+				if quote_count % 2 == 0 {
+					return Some(len)
+				} else {
+					return None
+				}
+			} else {
+				return None
+			}
+		}
+	}
 });
 
 tkrule_def!(ProcSub, |input: &str| {

src/parse/parse.rs

@@ -83,6 +83,7 @@ pub enum NdRule {
 	Main { cmd_lists: Vec<Node> },
 	Command { argv: Vec<Token>, redirs: Vec<Redir> },
 	Assignment { assignments: Vec<Token>, cmd: Option<Box<Node>> },
+	FuncDef { name: Token, body: Token },
 	Subshell { body: Token, argv: Vec<Token>, redirs: Vec<Redir> },
 	CmdList { cmds: Vec<(Option<CmdGuard>,Node)> },
 	Pipeline { cmds: Vec<Node> }
@@ -255,6 +256,7 @@ ndrule_def!(CmdList, |tokens: &[Token]| {
 
 ndrule_def!(Expr, |tokens: &[Token]| {
 	try_rules!(tokens,
+		ShellCmd,
 		Pipeline,
 		Subshell,
 		Assignment,
@@ -264,12 +266,57 @@ ndrule_def!(Expr, |tokens: &[Token]| {
 // Used in pipelines to avoid recursion
 ndrule_def!(ExprNoPipeline, |tokens: &[Token]| {
 	try_rules!(tokens,
+		ShellCmd,
 		Subshell,
 		Assignment,
 		Command
 	);
 });
 
+ndrule_def!(ShellCmd, |tokens: &[Token]| {
+	try_rules!(tokens,
+		FuncDef
+	);
+});
+
+ndrule_def!(FuncDef, |tokens: &[Token]| {
+	let mut tokens_iter = tokens.iter();
+	let mut node_toks = vec![];
+	let name: Token;
+	let body: Token;
+
+	if let Some(token) = tokens_iter.next() {
+		if let TkRule::FuncName = token.rule() {
+			node_toks.push(token.clone());
+			name = token.clone();
+		} else {
+			return Ok(None)
+		}
+	} else {
+		return Ok(None)
+	}
+
+	if let Some(token) = tokens_iter.next() {
+		if let TkRule::BraceGrp = token.rule() {
+			node_toks.push(token.clone());
+			body = token.clone();
+		} else {
+			return Ok(None)
+		}
+	} else {
+		return Ok(None)
+	}
+
+	let span = get_span(&node_toks)?;
+	let node = Node {
+		node_rule: NdRule::FuncDef { name, body },
+		tokens: node_toks,
+		span,
+		flags: NdFlag::empty()
+	};
+	Ok(Some(node))
+});
+
 ndrule_def!(Subshell, |tokens: &[Token]| {
 	let mut tokens_iter = tokens.iter();
 	let mut node_toks = vec![];

src/prelude.rs

@@ -86,6 +86,7 @@ pub use crate::{
 			Redir,
 			RedirType,
 			RedirBldr,
+			StrOps,
 			RedirTarget,
 			CmdRedirs,
 			borrow_fd,
@@ -112,12 +113,17 @@ pub use crate::{
 		cd::cd,
 		pwd::pwd,
 		read::read_builtin,
+		alias::alias,
 		jobctl::{
 			continue_job,
 			jobs
 		},
 		BUILTINS
 	},
+	expand::{
+		expand_argv,
+		alias::expand_aliases
+	},
 	shellenv::{
 		self,
 		wait_fg,

src/prompt/highlight.rs

@@ -16,7 +16,7 @@ impl<'a> Highlighter for SynHelper<'a> {
 			let raw = token.to_string();
 			match token.rule() {
 				TkRule::Comment => {
-					let styled = style_text(&raw, Style::BrightBlack);
+					let styled = &raw.styled(Style::BrightBlack);
 					result.push_str(&styled);
 				}
 				TkRule::ErrPipeOp |
@@ -26,46 +26,70 @@ impl<'a> Highlighter for SynHelper<'a> {
 				TkRule::RedirOp |
 				TkRule::BgOp => {
 					is_command = true;
-					let styled = style_text(&raw, Style::Cyan);
+					let styled = &raw.styled(Style::Cyan);
 					result.push_str(&styled);
 				}
+				TkRule::FuncName => {
+					let name = raw.strip_suffix("()").unwrap_or(&raw);
+					let styled = name.styled(Style::Cyan);
+					let rebuilt = format!("{styled}()");
+					result.push_str(&rebuilt);
+				}
 				TkRule::Keyword => {
 					if &raw == "for" {
 						in_array = true;
 					}
-					let styled = style_text(&raw, Style::Yellow);
+					let styled = &raw.styled(Style::Yellow);
 					result.push_str(&styled);
 				}
+				TkRule::BraceGrp => {
+					let body = &raw[1..raw.len() - 1];
+					let highlighted = self.highlight(body, 0).to_string();
+					let styled_o_brace = "{".styled(Style::BrightBlue);
+					let styled_c_brace = "}".styled(Style::BrightBlue);
+					let rebuilt = format!("{styled_o_brace}{highlighted}{styled_c_brace}");
+
+					is_command = false;
+					result.push_str(&rebuilt);
+				}
 				TkRule::Subshell => {
 					let body = &raw[1..raw.len() - 1];
 					let highlighted = self.highlight(body, 0).to_string();
-					let styled_o_paren = style_text("(", Style::BrightBlue);
-					let styled_c_paren = style_text(")", Style::BrightBlue);
+					let styled_o_paren = "(".styled(Style::BrightBlue);
+					let styled_c_paren = ")".styled(Style::BrightBlue);
 					let rebuilt = format!("{styled_o_paren}{highlighted}{styled_c_paren}");
+
 					is_command = false;
 					result.push_str(&rebuilt);
 				}
 				TkRule::Ident => {
 					if in_array {
 						if &raw == "in" {
-							let styled = style_text(&raw, Style::Yellow);
+							let styled = &raw.styled(Style::Yellow);
 							result.push_str(&styled);
 						} else {
-							let styled = style_text(&raw, Style::Magenta);
+							let styled = &raw.styled(Style::Magenta);
 							result.push_str(&styled);
 						}
+
+					} else if &raw == "{" || &raw == "}" {
+						result.push_str(&raw);
+
 					} else if is_command {
 						if get_bin_path(&token.to_string(), self.shenv).is_some() ||
 						self.shenv.logic().get_alias(&raw).is_some() ||
 						self.shenv.logic().get_function(&raw).is_some() ||
 						BUILTINS.contains(&raw.as_str()) {
-							let styled = style_text(&raw, Style::Green);
+							let styled = &raw.styled(Style::Green);
 							result.push_str(&styled);
+
 						} else {
-							let styled = style_text(&raw, Style::Red | Style::Bold);
+							let styled = &raw.styled(Style::Red | Style::Bold);
 							result.push_str(&styled);
 						}
+
 						is_command = false;
+
 					} else {
 						result.push_str(&raw);
 					}

src/prompt/mod.rs

@@ -1,6 +1,6 @@
 use crate::prelude::*;
 use readline::SynHelper;
-use rustyline::{config::Configurer, history::DefaultHistory, ColorMode, CompletionType, Config, DefaultEditor, EditMode, Editor};
+use rustyline::{config::Configurer, history::{DefaultHistory, History}, ColorMode, CompletionType, Config, DefaultEditor, EditMode, Editor};
 
 pub mod readline;
 pub mod highlight;
@@ -27,10 +27,19 @@ fn init_rl<'a>(shenv: &'a mut ShEnv) -> Editor<SynHelper<'a>, DefaultHistory> {
 
 pub fn read_line<'a>(shenv: &'a mut ShEnv) -> ShResult<String> {
 	log!(TRACE, "Entering prompt");
-	let prompt = &style_text("$ ", Style::Green | Style::Bold);
+	let prompt = "$ ".styled(Style::Green | Style::Bold);
 	let mut editor = init_rl(shenv);
-	match editor.readline(prompt) {
-		Ok(line) => Ok(line),
+	match editor.readline(&prompt) {
+		Ok(line) => {
+			if !line.is_empty() {
+				let hist_path = std::env::var("FERN_HIST").ok();
+				editor.history_mut().add(&line).unwrap();
+				if let Some(path) = hist_path {
+					editor.history_mut().save(&PathBuf::from(path)).unwrap();
+				}
+			}
+			Ok(line)
+		},
 		Err(rustyline::error::ReadlineError::Eof) => {
 			kill(Pid::this(), Signal::SIGQUIT)?;
 			Ok(String::new())

src/prompt/readline.rs

@@ -54,7 +54,7 @@ pub struct SynHint {
 
 impl SynHint {
 	pub fn new(text: String) -> Self {
-		let styled = style_text(&text, Style::BrightBlack);
+		let styled = (&text).styled(Style::BrightBlack);
 		Self { text, styled }
 	}
 	pub fn empty() -> Self {
@@ -78,7 +78,6 @@ impl Hint for SynHint {
 impl<'a> Hinter for SynHelper<'a> {
 	type Hint = SynHint;
 	fn hint(&self, line: &str, pos: usize, ctx: &rustyline::Context<'_>) -> Option<Self::Hint> {
-		return Some(SynHint::empty());
 		if line.is_empty() {
 			return None
 		}

src/shellenv/jobs.rs

@@ -99,9 +99,10 @@ impl<'a> ChildProc {
 		} else {
 			WtStat::Exited(pid, 0)
 		};
+		log!(DEBUG, command);
 		let mut child = Self { pgid: pid, pid, command, stat };
 		if let Some(pgid) = pgid {
-			child.set_pgid(pgid)?;
+			child.set_pgid(pgid).ok();
 		}
 		Ok(child)
 	}
@@ -345,14 +346,14 @@ impl Job {
 			stat_line = format!("{}{} ",pid,stat_line);
 			stat_line = format!("{} {}", stat_line, cmd);
 			stat_line = match job_stat {
-				WtStat::Stopped(..) | WtStat::Signaled(..) => style_text(stat_line, Style::Magenta),
+				WtStat::Stopped(..) | WtStat::Signaled(..) => stat_line.styled(Style::Magenta),
 				WtStat::Exited(_, code) => {
 					match code {
-						0 => style_text(stat_line, Style::Green),
-						_ => style_text(stat_line, Style::Red),
+						0 => stat_line.styled(Style::Green),
+						_ => stat_line.styled(Style::Red),
 					}
 				}
-				_ => style_text(stat_line, Style::Cyan)
+				_ => stat_line.styled(Style::Cyan)
 			};
 			if i != self.get_cmds().len() - 1 {
 				stat_line = format!("{} |",stat_line);

src/shellenv/logic.rs

@@ -16,7 +16,13 @@ impl LogTab {
 	pub fn get_alias(&self,name: &str) -> Option<&str> {
 		self.aliases.get(name).map(|a| a.as_str())
 	}
+	pub fn set_alias(&mut self, name: &str, body: &str) {
+		self.aliases.insert(name.to_string(),body.trim().to_string());
+	}
 	pub fn get_function(&self,name: &str) -> Option<&str> {
 		self.functions.get(name).map(|a| a.as_str())
 	}
+	pub fn set_function(&mut self, name: &str, body: &str) {
+		self.functions.insert(name.to_string(),body.trim().to_string());
+	}
 }

src/shellenv/vars.rs

@@ -92,8 +92,8 @@ impl VarTab {
 		env::set_var("HOME", home.clone());
 		env_vars.insert("SHELL".into(), pathbuf_to_string(std::env::current_exe()));
 		env::set_var("SHELL", pathbuf_to_string(std::env::current_exe()));
-		env_vars.insert("HIST_FILE".into(),format!("{}/.fern_hist",home));
-		env::set_var("HIST_FILE",format!("{}/.fern_hist",home));
+		env_vars.insert("FERN_HIST".into(),format!("{}/.fern_hist",home));
+		env::set_var("FERN_HIST",format!("{}/.fern_hist",home));
 
 		env_vars
 	}