Fixed command substitutions not expanding when used as a command name

src/main.rs

@@ -23,7 +23,6 @@ use std::process::ExitCode;
 use std::sync::atomic::Ordering;
 
 use nix::errno::Errno;
-use nix::libc::STDIN_FILENO;
 use nix::poll::{PollFd, PollFlags, PollTimeout, poll};
 use nix::unistd::read;
 
@@ -33,7 +32,7 @@ use crate::libsh::sys::TTY_FILENO;
 use crate::parse::execute::exec_input;
 use crate::prelude::*;
 use crate::prompt::get_prompt;
-use crate::prompt::readline::term::raw_mode;
+use crate::prompt::readline::term::{RawModeGuard, raw_mode};
 use crate::prompt::readline::{FernVi, ReadlineEvent};
 use crate::signal::{QUIT_CODE, check_signals, sig_setup, signals_pending};
 use crate::state::{read_logic, source_rc, write_jobs, write_meta};
@@ -115,8 +114,7 @@ fn main() -> ExitCode {
 	};
 
 	if let Some(trap) = read_logic(|l| l.get_trap(TrapTarget::Exit))
-    && let Err(e) = exec_input(trap, None, false)
+	&& let Err(e) = exec_input(trap, None, false) {
-  {
 		eprintln!("fern: error running EXIT trap: {e}");
 	}
 
@@ -215,10 +213,7 @@ fn fern_interactive() -> ShResult<()> {
 		}
 
 		// Check if stdin has data
-    if fds[0]
+		if fds[0].revents().is_some_and(|r| r.contains(PollFlags::POLLIN)) {
-      .revents()
-      .is_some_and(|r| r.contains(PollFlags::POLLIN))
-    {
 			let mut buffer = [0u8; 1024];
 			match read(*TTY_FILENO, &mut buffer) {
 				Ok(0) => {
@@ -244,7 +239,7 @@ fn fern_interactive() -> ShResult<()> {
 			Ok(ReadlineEvent::Line(input)) => {
 				let start = Instant::now();
 				write_meta(|m| m.start_timer());
-        if let Err(e) = exec_input(input, None, true) {
+				if let Err(e) = RawModeGuard::with_cooked_mode(|| exec_input(input, None, true)) {
 					match e.kind() {
 						ShErrKind::CleanExit(code) => {
 							QUIT_CODE.store(*code, Ordering::SeqCst);

src/parse/execute.rs

@@ -155,7 +155,9 @@ pub fn exec_input(input: String, io_stack: Option<IoStack>, interactive: bool) -
     return Ok(());
   }
 
-  let mut dispatcher = Dispatcher::new(parser.extract_nodes(), interactive);
+	let nodes = parser.extract_nodes();
+
+  let mut dispatcher = Dispatcher::new(nodes, interactive);
   if let Some(mut stack) = io_stack {
     dispatcher.io_stack.extend(stack.drain(..));
   }

src/parse/lex.rs

@@ -659,6 +659,9 @@ impl LexStream {
         }
         _ if is_cmd_sub(text) => {
           new_tk.mark(TkFlags::IS_CMDSUB);
+					if self.next_is_cmd() {
+						new_tk.mark(TkFlags::IS_CMD);
+					}
           self.set_next_is_cmd(false);
         }
         _ => {
@@ -846,11 +849,26 @@ pub fn is_field_sep(ch: char) -> bool {
 }
 
 pub fn is_keyword(slice: &str) -> bool {
-  KEYWORDS.contains(&slice) || (slice.ends_with("()") && !slice.ends_with("\\()"))
+  KEYWORDS.contains(&slice) || ends_with_unescaped(slice, "()")
 }
 
 pub fn is_cmd_sub(slice: &str) -> bool {
-  (slice.starts_with("$(") && slice.ends_with(')')) && !slice.ends_with("\\)")
+  slice.starts_with("$(") && ends_with_unescaped(slice,")")
+}
+
+pub fn ends_with_unescaped(slice: &str, pat: &str) -> bool {
+	slice.ends_with(pat) && !pos_is_escaped(slice, slice.len() - pat.len())
+}
+
+pub fn pos_is_escaped(slice: &str, pos: usize) -> bool {
+	let bytes = slice.as_bytes();
+	let mut escaped = false;
+	let mut i = pos;
+	while i > 0 && bytes[i - 1] == b'\\' {
+		escaped = !escaped;
+		i -= 1;
+	}
+	escaped
 }
 
 pub fn lookahead(pat: &str, mut chars: Chars) -> Option<usize> {

src/prompt/readline/highlight.rs

@@ -184,14 +184,16 @@ impl Highlighter {
             input_chars.next();
           }
 
+          let inner_clean = Self::strip_markers(&inner);
+
           // Determine prefix from content (handles both <( and >( for proc subs)
           let prefix = match ch {
             markers::CMD_SUB => "$(",
             markers::SUBSH => "(",
             markers::PROC_SUB => {
-              if inner.starts_with("<(") {
+              if inner_clean.starts_with("<(") {
                 "<("
-              } else if inner.starts_with(">(") {
+              } else if inner_clean.starts_with(">(") {
                 ">("
               } else {
                 "<("
@@ -199,14 +201,13 @@ impl Highlighter {
             }
             _ => unreachable!(),
           };
-
           let inner_content = if incomplete {
-            inner.strip_prefix(prefix).unwrap_or(&inner)
+            inner_clean.strip_prefix(prefix).unwrap_or(&inner_clean)
           } else {
-            inner
+            inner_clean
               .strip_prefix(prefix)
               .and_then(|s| s.strip_suffix(")"))
-              .unwrap_or(&inner)
+              .unwrap_or(&inner_clean)
           };
 
           let mut recursive_highlighter = Self::new();