Implemented case statements

src/builtin/cd.rs

@@ -1,4 +1,4 @@
-use crate::{parse::parse::{Node, NdRule}, prelude::*};
+use crate::prelude::*;
 
 pub fn cd(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 	let rule = node.into_rule();

src/builtin/echo.rs

@@ -1,6 +1,6 @@
 use shellenv::jobs::{ChildProc, JobBldr};
 
-use crate::{libsh::utils::ArgVec, parse::parse::{Node, NdRule}, prelude::*};
+use crate::prelude::*;
 
 pub fn echo(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 	let rule = node.into_rule();

src/builtin/pwd.rs

@@ -1,6 +1,6 @@
 use shellenv::jobs::{ChildProc, JobBldr};
 
-use crate::{parse::parse::{Node, NdRule}, prelude::*};
+use crate::prelude::*;
 
 pub fn pwd(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
 	let rule = node.into_rule();

src/execute/ifthen.rs

@@ -1,27 +0,0 @@
-use crate::prelude::*;
-
-pub fn exec_if(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
-	let rule = node.into_rule();
-	if let NdRule::IfThen { cond_blocks, else_block, redirs } = rule {
-		shenv.collect_redirs(redirs);
-		if shenv.ctx().flags().contains(ExecFlags::NO_FORK) {
-			shenv.ctx_mut().unset_flag(ExecFlags::NO_FORK);
-		}
-		let mut cond_blocks = cond_blocks.into_iter();
-
-		while let Some(block) = cond_blocks.next() {
-			let cond = block.0;
-			let body = block.1;
-			let ret = shenv.exec_as_cond(cond)?;
-			if ret == 0 {
-				shenv.exec_as_body(body)?;
-				return Ok(())
-			}
-		}
-
-		if let Some(block) = else_block {
-			shenv.exec_as_body(block)?;
-		}
-	} else { unreachable!() }
-	Ok(())
-}

src/execute/loops.rs

@@ -1,48 +0,0 @@
-use crate::{parse::parse::LoopKind, prelude::*};
-
-pub fn exec_loop(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
-	let rule = node.into_rule();
-
-	if let NdRule::Loop { kind, cond, body, redirs } = rule {
-		shenv.collect_redirs(redirs);
-
-		if shenv.ctx().flags().contains(ExecFlags::NO_FORK) {
-			shenv.ctx_mut().unset_flag(ExecFlags::NO_FORK);
-		}
-
-		loop {
-			let ret = shenv.exec_as_cond(cond.clone())?;
-			match kind {
-				LoopKind::While => {
-					if ret == 0 {
-						match shenv.exec_as_body(body.clone()) {
-							Ok(_) => continue,
-							Err(e) => {
-								match e.kind() {
-									ShErrKind::LoopContinue => continue,
-									ShErrKind::LoopBreak => break,
-									_ => return Err(e.into())
-								}
-							}
-						}
-					} else { break }
-				}
-				LoopKind::Until => {
-					if ret != 0 {
-						match shenv.exec_as_body(body.clone()) {
-							Ok(_) => continue,
-							Err(e) => {
-								match e.kind() {
-									ShErrKind::LoopContinue => continue,
-									ShErrKind::LoopBreak => break,
-									_ => return Err(e.into())
-								}
-							}
-						}
-					} else { break }
-				}
-			}
-		}
-	} else { unreachable!() }
-	Ok(())
-}

src/execute/mod.rs

@@ -1,11 +1,10 @@
 use std::os::fd::AsRawFd;
 
+use crate::prelude::*;
 use shellenv::jobs::{ChildProc, JobBldr};
 
-use crate::{builtin::export::export, libsh::{error::Blame, sys::{execvpe, get_bin_path}, utils::{ArgVec, StrOps}}, parse::{lex::Token, parse::{CmdGuard, NdFlag, Node, NdRule, SynTree}}, prelude::*};
+pub mod shellcmd;
 
-pub mod ifthen;
-pub mod loops;
 
 pub fn exec_input<S: Into<String>>(input: S, shenv: &mut ShEnv) -> ShResult<()> {
 	let input = input.into();
@@ -43,6 +42,7 @@ impl<'a> Executor<'a> {
 	}
 	pub fn walk(&mut self) -> ShResult<()> {
 		self.shenv.ctx_mut().descend()?;
+		self.shenv.inputman_mut().save_state();
 		log!(DEBUG, "Starting walk");
 		while let Some(node) = self.ast.next_node() {
 			if let NdRule::CmdList { cmds } = node.clone().into_rule() {
@@ -51,6 +51,8 @@ impl<'a> Executor<'a> {
 			} else { unreachable!() }
 		}
 		self.shenv.ctx_mut().ascend();
+		self.shenv.inputman_mut().load_state();
+		log!(DEBUG, "passed");
 		Ok(())
 	}
 }
@@ -79,8 +81,10 @@ fn exec_list(list: Vec<(Option<CmdGuard>, Node)>, shenv: &mut ShEnv) -> ShResult
 		match *cmd.rule() {
 			NdRule::Command {..} => dispatch_command(cmd, shenv).try_blame(cmd_raw, span)?,
 			NdRule::Subshell {..} => exec_subshell(cmd,shenv).try_blame(cmd_raw, span)?,
-			NdRule::IfThen {..} => ifthen::exec_if(cmd, shenv).try_blame(cmd_raw, span)?,
-			NdRule::Loop {..} => loops::exec_loop(cmd, shenv).try_blame(cmd_raw, span)?,
+			NdRule::IfThen {..} => shellcmd::exec_if(cmd, shenv).try_blame(cmd_raw, span)?,
+			NdRule::Loop {..} => shellcmd::exec_loop(cmd, shenv).try_blame(cmd_raw, span)?,
+			NdRule::ForLoop {..} => shellcmd::exec_for(cmd, shenv).try_blame(cmd_raw, span)?,
+			NdRule::Case {..} => shellcmd::exec_case(cmd, shenv).try_blame(cmd_raw, span)?,
 			NdRule::FuncDef {..} => exec_funcdef(cmd,shenv).try_blame(cmd_raw, span)?,
 			NdRule::Assignment {..} => exec_assignment(cmd,shenv).try_blame(cmd_raw, span)?,
 			NdRule::Pipeline {..} => exec_pipeline(cmd, shenv).try_blame(cmd_raw, span)?,

src/execute/shellcmd.rs

@@ -0,0 +1,149 @@
+use crate::prelude::*;
+
+pub fn exec_if(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+	if let NdRule::IfThen { cond_blocks, else_block, redirs } = rule {
+		shenv.collect_redirs(redirs);
+		if shenv.ctx().flags().contains(ExecFlags::NO_FORK) {
+			shenv.ctx_mut().unset_flag(ExecFlags::NO_FORK);
+		}
+		let mut cond_blocks = cond_blocks.into_iter();
+
+		while let Some(block) = cond_blocks.next() {
+			let cond = block.0;
+			let body = block.1;
+			let ret = shenv.exec_as_cond(cond)?;
+			if ret == 0 {
+				shenv.exec_as_body(body)?;
+				return Ok(())
+			}
+		}
+
+		if let Some(block) = else_block {
+			shenv.exec_as_body(block)?;
+		}
+	} else { unreachable!() }
+	Ok(())
+}
+
+pub fn exec_loop(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+
+	if let NdRule::Loop { kind, cond, body, redirs } = rule {
+		shenv.collect_redirs(redirs);
+
+		if shenv.ctx().flags().contains(ExecFlags::NO_FORK) {
+			shenv.ctx_mut().unset_flag(ExecFlags::NO_FORK);
+		}
+
+		loop {
+			let ret = shenv.exec_as_cond(cond.clone())?;
+			match kind {
+				LoopKind::While => {
+					if ret == 0 {
+						match shenv.exec_as_body(body.clone()) {
+							Ok(_) => continue,
+							Err(e) => {
+								match e.kind() {
+									ShErrKind::LoopContinue => continue,
+									ShErrKind::LoopBreak => break,
+									_ => return Err(e.into())
+								}
+							}
+						}
+					} else { break }
+				}
+				LoopKind::Until => {
+					if ret != 0 {
+						match shenv.exec_as_body(body.clone()) {
+							Ok(_) => continue,
+							Err(e) => {
+								match e.kind() {
+									ShErrKind::LoopContinue => continue,
+									ShErrKind::LoopBreak => break,
+									_ => return Err(e.into())
+								}
+							}
+						}
+					} else { break }
+				}
+			}
+		}
+	} else { unreachable!() }
+	Ok(())
+}
+
+pub fn exec_for(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+
+	if let NdRule::ForLoop { vars, arr, body, redirs } = rule {
+		shenv.collect_redirs(redirs);
+		let saved_vars = shenv.vars().clone();
+
+		if shenv.ctx().flags().contains(ExecFlags::NO_FORK) {
+			shenv.ctx_mut().unset_flag(ExecFlags::NO_FORK);
+		}
+		log!(DEBUG, vars);
+		log!(DEBUG, arr);
+
+		for chunk in arr.chunks(vars.len()) {
+			log!(DEBUG, "input: {}", shenv.get_input());
+			for (var,value) in vars.iter().zip(chunk.iter()) {
+				let var = var.as_raw(shenv);
+				let val = value.as_raw(shenv);
+				log!(DEBUG,var);
+				log!(DEBUG,val);
+				shenv.vars_mut().set_var(&var, &val);
+			}
+
+			if chunk.len() < vars.len() {
+				for var in &vars[chunk.len()..] { // If 'vars' is longer than the chunk, then unset the orphaned vars
+					let var = var.as_raw(shenv);
+					log!(DEBUG, "unsetting");
+					log!(DEBUG, var);
+					shenv.vars_mut().unset_var(&var);
+				}
+			}
+
+			shenv.exec_as_body(body.clone())?;
+		}
+		*shenv.vars_mut() = saved_vars;
+
+	} else { unreachable!() }
+	Ok(())
+}
+
+pub fn exec_case(node: Node, shenv: &mut ShEnv) -> ShResult<()> {
+	let rule = node.into_rule();
+
+	if let NdRule::Case { pat, blocks, redirs } = rule {
+		shenv.collect_redirs(redirs);
+		let mut blocks_iter = blocks.into_iter();
+		let pat_raw = expand_token(pat, shenv)
+			.iter()
+			.map(|tk| tk.as_raw(shenv))
+			.collect::<Vec<_>>()
+			.join(" ");
+
+		while let Some((block_pat, block)) = blocks_iter.next() {
+			let block_pat_raw = block_pat.as_raw(shenv);
+			let block_pat_raw = block_pat_raw.trim_end_matches(')');
+			if block_pat_raw == "*" {
+				let _ret = shenv.exec_as_body(block)?;
+				return Ok(())
+			} else if block_pat_raw.contains('|') {
+				let pats = block_pat_raw.split('|');
+				for pat in pats {
+					if pat_raw.trim() == pat.trim() {
+						let _ret = shenv.exec_as_body(block)?;
+						return Ok(())
+					}
+				}
+			} else if pat_raw.trim() == block_pat_raw.trim() {
+				let _ret = shenv.exec_as_body(block)?;
+				return Ok(())
+			}
+		}
+	} else { unreachable!() }
+	Ok(())
+}

src/expand/mod.rs

@@ -13,25 +13,32 @@ pub fn expand_argv(argv: Vec<Token>, shenv: &mut ShEnv) -> Vec<Token> {
 	for arg in argv {
 		log!(DEBUG, "{}",arg.as_raw(shenv));
 		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(), shenv);
-				processed.push(tilde_exp);
-			}
-			_ => {
-				if arg.rule() != TkRule::Ident {
-					log!(WARN, "found this in expand_argv: {:?}", arg.rule());
-				}
-				processed.push(arg.clone())
+		let mut expanded = expand_token(arg, shenv);
+		processed.append(&mut expanded);
+	}
+	processed
+}
+
+pub fn expand_token(token: Token, shenv: &mut ShEnv) -> Vec<Token> {
+	let mut processed = vec![];
+	match token.rule() {
+		TkRule::DQuote => {
+			let dquote_exp = expand_dquote(token.clone(), shenv);
+			processed.push(dquote_exp);
+		}
+		TkRule::VarSub => {
+			let mut varsub_exp = expand_var(token.clone(), shenv);
+			processed.append(&mut varsub_exp);
+		}
+		TkRule::TildeSub => {
+			let tilde_exp = expand_tilde(token.clone(), shenv);
+			processed.push(tilde_exp);
+		}
+		_ => {
+			if token.rule() != TkRule::Ident {
+				log!(WARN, "found this in expand_token: {:?}", token.rule());
 			}
+			processed.push(token.clone())
 		}
 	}
 	processed

src/libsh/error.rs

@@ -219,7 +219,7 @@ impl ShErr {
 		}
 	}
 	pub fn get_line(&self) -> (usize,usize,String) {
-		if let ShErr::Full { kind, message, blame } = self {
+		if let ShErr::Full { kind: _, message: _, blame } = self {
 			unsafe {
 				let mut dist = 0;
 				let mut line_no = 0;
@@ -256,8 +256,7 @@ impl Display for ShErr {
 			ShErr::Simple { kind: _, message } => format!("{}{}",self.display_kind(),message),
 			ShErr::Full { kind: _, message, blame } => {
 				let (offset,line_no,line_text) = self.get_line();
-				log!(DEBUG, blame);
-				let dist = blame.len();
+				let dist = blame.end().saturating_sub(blame.start());
 				let padding = " ".repeat(offset);
 				let line_inner = "~".repeat(dist.saturating_sub(2));
 				let err_kind = &self.display_kind().styled(Style::Red | Style::Bold);

src/parse/lex.rs

@@ -19,13 +19,14 @@ pub const KEYWORDS: [TkRule;14] = [
 	TkRule::Esac
 ];
 
-pub const SEPARATORS: [TkRule; 6] = [
+pub const SEPARATORS: [TkRule; 7] = [
 	TkRule::Sep,
 	TkRule::AndOp,
 	TkRule::OrOp,
 	TkRule::PipeOp,
 	TkRule::ErrPipeOp,
 	TkRule::BgOp,
+	TkRule::CasePat
 ];
 
 pub trait LexRule {
@@ -105,15 +106,16 @@ impl Debug for Token {
 	}
 }
 
-#[derive(Debug,Clone)]
+#[derive(PartialEq,Debug,Clone)]
 pub struct Span {
 	start: usize,
-	end: usize
+	end: usize,
+	pub expanded: bool
 }
 
 impl Span {
 	pub fn new(start: usize, end: usize) -> Self {
-		Self { start, end }
+		Self { start, end, expanded: false }
 	}
 	pub fn start(&self) -> usize {
 		self.start
@@ -181,6 +183,7 @@ pub enum TkRule {
 	ProcSub,
 	VarSub,
 	TildeSub,
+	ArithSub,
 	Subshell,
 	CmdSub,
 	DQuote,
@@ -199,6 +202,7 @@ pub enum TkRule {
 	Done,
 	Case,
 	Esac,
+	CasePat,
 	Assign,
 	Ident,
 	Sep,
@@ -213,6 +217,7 @@ impl TkRule {
 		try_match!(VarSub,input);
 		try_match!(ProcSub,input);
 		try_match!(CmdSub,input);
+		try_match!(ArithSub,input);
 		try_match!(AndOp,input);
 		try_match!(OrOp,input);
 		try_match!(PipeOp,input);
@@ -225,6 +230,7 @@ impl TkRule {
 		try_match!(BraceGrp,input);
 		try_match!(TildeSub,input);
 		try_match!(Subshell,input);
+		try_match!(CasePat,input);
 		try_match!(Sep,input);
 		try_match!(Assign,input);
 		try_match!(If,input);
@@ -269,6 +275,16 @@ tkrule_def!(Whitespace, |input: &str| {
 	let mut len = 0;
 	while let Some(ch) = chars.next() {
 		match ch {
+			'\\' => {
+				len += 1;
+				if let Some(ch) = chars.next() {
+					if matches!(ch, ' ' | '\t' | '\n') {
+						len += 1;
+					} else {
+						return None
+					}
+				}
+			}
 			' ' | '\t' => len += 1,
 			_ => {
 				match len {
@@ -284,6 +300,71 @@ tkrule_def!(Whitespace, |input: &str| {
 	}
 });
 
+tkrule_def!(CasePat, |input:&str| {
+	let mut chars = input.chars();
+	let mut len = 0;
+	let mut is_casepat = false;
+	while let Some(ch) = chars.next() {
+		len += 1;
+		match ch {
+			'\\' => {
+				if chars.next().is_some() {
+					len += 1;
+				}
+			}
+			')' => {
+				while let Some(ch) = chars.next() {
+					if ch == ')' {
+						len += 1;
+					} else {
+						break
+					}
+				}
+				is_casepat = true;
+				break
+			}
+			_ if ch.is_whitespace() => return None,
+			_ => { /* Continue */ }
+		}
+	}
+	if is_casepat { Some(len) } else { None }
+});
+
+tkrule_def!(ArithSub, |input: &str| {
+	let mut chars = input.chars();
+	let mut len = 0;
+	let mut is_arith_sub = false;
+	while let Some(ch) = chars.next() {
+		len += 1;
+		match ch {
+			'\\' => {
+				if chars.next().is_some() {
+					len += 1;
+				}
+			}
+			'`' => {
+				while let Some(ch) = chars.next() {
+					len += 1;
+					match ch {
+						'\\' => {
+							if chars.next().is_some() {
+								len += 1;
+							}
+						}
+						'`' => {
+							is_arith_sub = true;
+							break
+						}
+						_ => { /* Continue */ }
+					}
+				}
+			}
+			_ => { /* Continue */ }
+		}
+	}
+	if is_arith_sub { Some(len) } else { None }
+});
+
 tkrule_def!(TildeSub, |input: &str| {
 	let mut chars = input.chars();
 	let mut len = 0;
@@ -567,8 +648,14 @@ tkrule_def!(Sep, |input: &str| {
 	while let Some(ch) = chars.next() {
 		match ch {
 			'\\' => {
-				chars.next();
-				len += 2;
+				return None
+			}
+			' ' | '\t' => {
+				if len == 0 {
+					return None
+				} else {
+					len += 1;
+				}
 			}
 			';' | '\n' => len += 1,
 			_ => {

src/prelude.rs

@@ -97,6 +97,7 @@ pub use crate::{
 		},
 		sys::{
 			self,
+			get_bin_path,
 			sh_quit,
 			read_to_string,
 			write_err,
@@ -106,6 +107,7 @@ pub use crate::{
 		},
 		error::{
 			ResultExt,
+			Blame,
 			ShErrKind,
 			ShErr,
 			ShResult
@@ -118,6 +120,7 @@ pub use crate::{
 		read::read_builtin,
 		alias::alias,
 		control_flow::sh_flow,
+		export::export,
 		jobctl::{
 			continue_job,
 			jobs
@@ -126,6 +129,7 @@ pub use crate::{
 	},
 	expand::{
 		expand_argv,
+		expand_token,
 		alias::expand_aliases
 	},
 	shellenv::{
@@ -149,13 +153,14 @@ pub use crate::{
 		Executor,
 	},
 	parse::{
-		parse::{
-			SynTree,
-			Node,
-			NdRule,
-			Parser,
-			ParseRule
-		},
+		SynTree,
+		LoopKind,
+		Node,
+		CmdGuard,
+		NdFlag,
+		NdRule,
+		Parser,
+		ParseRule,
 		lex::{
 			Span,
 			Token,

src/prompt/validate.rs

@@ -7,13 +7,26 @@ use super::readline::SynHelper;
 pub fn check_delims(line: &str) -> bool {
 	let mut delim_stack = vec![];
 	let mut chars = line.chars();
+	let mut in_case = false;
+	let mut case_check = String::new();
 	let mut in_quote = None; // Tracks which quote type is open (`'` or `"`)
 
 	while let Some(ch) = chars.next() {
+		case_check.push(ch);
+		if case_check.ends_with("case") {
+			in_case = true;
+		}
+		if case_check.ends_with("esac") {
+			in_case = false;
+		}
 		match ch {
 			'{' | '(' | '[' if in_quote.is_none() => delim_stack.push(ch),
 			'}' if in_quote.is_none() && delim_stack.pop() != Some('{') => return false,
-			')' if in_quote.is_none() && delim_stack.pop() != Some('(') => return false,
+			')' if in_quote.is_none() && delim_stack.pop() != Some('(') => {
+				if !in_case {
+					return false
+				}
+			}
 			']' if in_quote.is_none() && delim_stack.pop() != Some('[') => return false,
 			'"' | '\'' => {
 				if in_quote == Some(ch) {

src/shellenv/input.rs

@@ -1,15 +1,16 @@
-
 use crate::prelude::*;
 
-#[derive(Clone,Debug)]
+#[derive(Clone,Debug,PartialEq)]
 pub struct InputMan {
 	input: Option<String>,
+	saved_input: Option<String>,
 	spans: Vec<Rc<RefCell<Span>>>,
+	saved_spans: Vec<Span>
 }
 
 impl InputMan {
 	pub fn new() -> Self {
-		Self { input: None, spans: vec![] }
+		Self { input: None, saved_input: None, spans: vec![], saved_spans: vec![] }
 	}
 	pub fn clear(&mut self) {
 		*self = Self::new();
@@ -23,6 +24,24 @@ impl InputMan {
 	pub fn get_input_mut(&mut self) -> Option<&mut String> {
 		self.input.as_mut()
 	}
+	pub fn save_state(&mut self) {
+		self.saved_input = self.input.clone();
+		self.saved_spans.clear();
+		for span in &self.spans {
+			self.saved_spans.push(span.borrow().clone());
+		}
+	}
+	pub fn load_state(&mut self) {
+		if self.saved_input.is_some() {
+			self.input = self.saved_input.take();
+
+			for (span, saved_span) in self.spans.iter_mut().zip(self.saved_spans.iter()) {
+				*span.borrow_mut() = saved_span.clone();
+			}
+
+			self.saved_spans.clear();
+		}
+	}
 	pub fn new_span(&mut self, start: usize, end: usize) -> Rc<RefCell<Span>> {
 		if let Some(_input) = &self.input {
 			let span = Rc::new(RefCell::new(Span::new(start, end)));

src/shellenv/shenv.rs

@@ -32,6 +32,11 @@ impl ShEnv {
 		&self.input_man.get_slice(span).unwrap_or_default()
 	}
 	pub fn expand_input(&mut self, new: &str, repl_span: Rc<RefCell<Span>>) -> Vec<Token> {
+		log!(DEBUG,repl_span);
+		if repl_span.borrow().expanded {
+			return vec![];
+		}
+		repl_span.borrow_mut().expanded = true;
 		let saved_spans = self.input_man.spans_mut().clone();
 		let mut new_tokens = Lexer::new(new.to_string(), self).lex();
 		*self.input_man.spans_mut() = saved_spans;
@@ -45,9 +50,10 @@ impl ShEnv {
 		let repl_end = repl_span.borrow().end();
 		let range = repl_start..repl_end;
 
-		if let Some(ref mut input) = self.input_man.get_input_mut() {
+		if let Some(input) = self.input_man.get_input_mut() {
 			let old = &input[range.clone()];
 			let delta: isize = new.len() as isize - old.len() as isize;
+			log!(DEBUG, input);
 			input.replace_range(range, new);
 			let expanded = input.clone();
 			log!(DEBUG, expanded);
@@ -74,6 +80,11 @@ impl ShEnv {
 			new_tokens
 		}
 	}
+	/// Executes a group of command lists, and only uses redirections that operate on input
+	/// For instance:
+	/// `if cat; then echo foo; fi < file.txt > otherfile.txt`
+	/// `cat` will be executed as a condition, meaning the input from file.txt will be the only
+	/// redirection used.
 	pub fn exec_as_cond(&mut self, nodes: Vec<Node>) -> ShResult<i32> {
 		let saved = self.ctx().clone();
 		self.ctx = self.ctx().as_cond();
@@ -82,6 +93,11 @@ impl ShEnv {
 		self.ctx = saved;
 		Ok(self.get_code())
 	}
+	/// Executes a group of command lists, and only uses redirections that operate on output
+	/// For instance:
+	/// `if cat; then echo foo; fi < file.txt > otherfile.txt`
+	/// `echo foo` will be executed as a body, meaning the output to otherfile.txt will be the only
+	/// redirection used.
 	pub fn exec_as_body(&mut self, nodes: Vec<Node>) -> ShResult<i32> {
 		let saved = self.ctx().clone();
 		self.ctx = self.ctx().as_body();
@@ -96,7 +112,7 @@ impl ShEnv {
 	}
 	pub fn get_input(&self) -> String {
 		let input = self.input_man.get_input().map(|s| s.to_string()).unwrap_or_default();
-		log!(DEBUG, input);
+		log!(TRACE, input);
 		input
 	}
 	pub fn inputman(&self) -> &shellenv::input::InputMan {

src/shellenv/vars.rs

@@ -155,6 +155,9 @@ impl VarTab {
 	pub fn set_var(&mut self, var: &str, val: &str) {
 		self.vars.insert(var.to_string(), val.to_string());
 	}
+	pub fn unset_var(&mut self, var: &str) {
+		self.vars.remove(var);
+	}
 	pub fn export(&mut self, var: &str, val: &str) {
 		self.env.insert(var.to_string(),val.to_string());
 		std::env::set_var(var, val);