From 9e41cdfb69532c51be5a241c975cec023b8d858b Mon Sep 17 00:00:00 2001
From: Matthias Andreas Benkard <code@mail.matthias.benkard.de>
Date: Wed, 30 Jul 2025 20:22:36 +0200
Subject: Implement EXIT.

---
 src/main.rs | 40 +++++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 11 deletions(-)

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
index 408a69b..61f6663 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -40,14 +40,14 @@ fn main() -> Result<()> {
         let Ok(CommandReceivers {
             stdout,
             stderr,
-            exit_status,
+            status,
         }) = command.run()
         else {
             eprintln!("unimplemented command: {}", line);
             continue;
         };
 
-        // print stdout, stderr interleaved until exit_status produces something
+        // print stdout, stderr interleaved until status produces something
         let stdout_writer = spawn(move || {
             loop {
                 let Ok(bytes) = stdout.recv() else {
@@ -75,9 +75,14 @@ fn main() -> Result<()> {
         stdout_writer.join().expect("stdout writer thread failed");
         stderr_writer.join().expect("stderr writer thread failed");
 
-        let _exit_status = exit_status
+        let command_result = status
             .recv()
             .expect("failed to receive exit status from command");
+
+        match command_result {
+            CommandStatus::ExitShell => break,
+            CommandStatus::Code(_) => {}
+        }
     }
 
     Ok(())
@@ -176,16 +181,22 @@ enum Command {
     Empty,
 }
 
+#[derive(Debug)]
+enum CommandStatus {
+    Code(u16),
+    ExitShell,
+}
+
 struct CommandReceivers {
     stdout: Receiver<Vec<u8>>,
     stderr: Receiver<Vec<u8>>,
-    exit_status: Receiver<u16>,
+    status: Receiver<CommandStatus>,
 }
 
 struct CommandSenders {
     stdout: SyncSender<Vec<u8>>,
     stderr: SyncSender<Vec<u8>>,
-    exit_status: SyncSender<u16>,
+    status: SyncSender<CommandStatus>,
 }
 
 struct CommandContext {
@@ -203,12 +214,12 @@ impl CommandContext {
             senders: CommandSenders {
                 stdout: sout,
                 stderr: serr,
-                exit_status: sexit,
+                status: sexit,
             },
             receivers: CommandReceivers {
                 stdout: rout,
                 stderr: rerr,
-                exit_status: rexit,
+                status: rexit,
             },
         }
     }
@@ -222,30 +233,35 @@ impl Command {
     pub(crate) fn run(&self) -> Result<CommandReceivers> {
         use crate::BuiltinCommand::*;
         use crate::Command::*;
+        use crate::CommandStatus::*;
 
         let (senders, receivers) = CommandContext::new().split();
         let CommandSenders {
             stdout,
             stderr,
-            exit_status,
+            status: status,
         } = senders;
 
         match self {
             Empty => {
-                exit_status.send(0)?;
+                status.send(Code(0))?;
             }
 
             Builtin(EchoText { message }) => {
                 stdout.send(message.bytes().collect())?;
                 stdout.send(b"\n".into())?;
-                exit_status.send(0)?;
+                status.send(Code(0))?;
             }
 
             Builtin(Cls) => {
                 let mut stdout_handle = io::stdout();
                 execute!(stdout_handle, terminal::Clear(terminal::ClearType::All))?;
                 execute!(stdout_handle, cursor::MoveTo(0, 0))?;
-                exit_status.send(0)?;
+                status.send(Code(0))?;
+            }
+
+            Builtin(Exit) => {
+                status.send(ExitShell)?;
             }
 
             _ => bail!("Command::run not implemented for {:?}", self),
@@ -423,6 +439,8 @@ impl Command {
 
             "CLS" => Ok(Builtin(Cls)),
 
+            "EXIT" => Ok(Builtin(Exit)),
+
             _ => Err(eyre::eyre!("parse not implemented for {:?}", input)),
         }
     }
-- 
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