From 9e617dde12565ba4e0ec737893b204a5e5271689 Mon Sep 17 00:00:00 2001
From: Jonas Maier <>
Date: Thu, 5 Mar 2026 08:45:45 +0100
Subject: some parsing, also add panic that does not spill

---
 src/main.rs  |  7 +++++++
 src/panic.rs | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/parse.rs |  7 ++++++-
 src/raw.rs   |  4 ++++
 4 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 src/panic.rs

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index 9b10890..edf5cb0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@ mod cursor;
 mod linebuf;
 mod parse;
 mod raw;
+mod panic;
 
 use linebuf::LineBuf;
 use raw::*;
@@ -36,6 +37,10 @@ macro_rules! println {
 const PROMPT: &str = "> ";
 
 fn run_command(raw: &ScopedRawMode, line: Vec<u8>) {
+
+    let parsed = parse::do_parse(&line);
+    println!("{parsed:?}");
+
     let mut words: Vec<&[u8]> = line.split(|x| *x == b' ').collect();
     words.retain(|w| !w.is_empty());
 
@@ -84,6 +89,8 @@ fn run_command(raw: &ScopedRawMode, line: Vec<u8>) {
 }
 
 fn main() {
+    crate::panic::hook();
+
     let stdin = io::stdin();
     let stdout = io::stdout();
 
diff --git a/src/panic.rs b/src/panic.rs
new file mode 100644
index 0000000..0df0a4e
--- /dev/null
+++ b/src/panic.rs
@@ -0,0 +1,48 @@
+use std::backtrace::{Backtrace, BacktraceStatus};
+use std::io::{self, Write};
+use std::panic::{self, PanicHookInfo};
+use std::sync::atomic::{AtomicBool, Ordering};
+
+static EMIT_CARRIAGE_RETURN: AtomicBool = AtomicBool::new(false);
+
+pub fn enable_cr() {
+    EMIT_CARRIAGE_RETURN.store(true, Ordering::SeqCst);
+}
+
+pub fn disable_cr() {
+    EMIT_CARRIAGE_RETURN.store(false, Ordering::SeqCst);
+}
+
+// thread 'main' panicked at src/main.rs:59:25:
+// not yet implemented: homedir
+// stack backtrace:
+// 0: __rustc::rust_begin_unwind at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:697:5
+// 1: core::panicking::panic_fmt at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/panicking.rs:75:14
+// 2: pish::run_command at ./src/main.rs:59:25
+// note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+fn panic_hook(info: &PanicHookInfo<'_>) {
+    let mut msg = format!("{}\n", info);
+
+    let bt = Backtrace::capture();
+    match bt.status() {
+        BacktraceStatus::Unsupported => msg += "backtrace unsupported\n",
+        BacktraceStatus::Disabled => msg += "no backtrace",
+        _ => {
+            msg += &format!("{bt}\n");
+        },
+    }
+
+    // TODO: add link to repo or sth
+    msg += "\n -== this is a bug ==-\n";
+
+    if EMIT_CARRIAGE_RETURN.load(Ordering::SeqCst) {
+        msg = msg.replace("\n", "\r\n");
+    }
+
+    let _ = io::stderr().write_all(msg.as_bytes());
+}
+
+pub fn hook() {
+    panic::set_hook(Box::new(panic_hook));
+}
diff --git a/src/parse.rs b/src/parse.rs
index ec4be30..27b07de 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -1,23 +1,28 @@
+#[derive(Debug)]
 pub enum Ast {
     AssignVar(AssignVar),
     Pipes(Pipes),
 }
 
+#[derive(Debug)]
 pub struct AssignVar {
     pub to: String,
     // TODO: body
 }
 
+#[derive(Debug)]
 pub struct Pipes {
     pub cmds: Vec<Command>,
 }
 
+#[derive(Debug)]
 pub struct Command {
     pub path: Vec<u8>,
     pub args: Vec<Vec<u8>>,
 }
 
-enum ParseError {
+#[derive(Debug)]
+pub enum ParseError {
     /// "clean" EOF, i.e. not in the middle of something
     Eof,
 
diff --git a/src/raw.rs b/src/raw.rs
index e116620..db2d269 100644
--- a/src/raw.rs
+++ b/src/raw.rs
@@ -1,5 +1,7 @@
 use termios::*;
 
+use crate::panic;
+
 /// can toggle raw mode on a fd, at the latest disables it when it gets dropped
 pub struct ScopedRawMode {
     fd: i32,
@@ -22,9 +24,11 @@ impl ScopedRawMode {
         let mut settings = self.settings.clone();
         cfmakeraw(&mut settings);
         tcsetattr(self.fd, TCSANOW, &settings).unwrap();
+        panic::enable_cr();
     }
 
     pub fn disable(&self) {
         tcsetattr(self.fd, TCSANOW, &self.settings).unwrap();
+        panic::disable_cr();
     }
 }
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