From 74341fb63625f9a3ee73833f347a9fc12ef31710 Mon Sep 17 00:00:00 2001
From: Jonas Maier <jonas@x77.dev>
Date: Fri, 6 Mar 2026 20:57:54 +0100
Subject: make shell tell you which variable is unbound

---
 src/run/mod.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'src/run')

diff --git a/src/run/mod.rs b/src/run/mod.rs
index ba37061..1880e8d 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -8,7 +8,7 @@ use crate::*;
 mod builtin;
 
 enum ExecError {
-    UnknownVariable,
+    UnknownVariable(BString),
     ExecError(i32),
 }
 
@@ -206,7 +206,7 @@ impl<'a> parse::Expander for Executor<'a> {
     fn expand_var(&mut self, var: BString) -> Result<BString, Self::Error> {
         match std::env::var_os(OsStr::from_bytes(&var)) {
             Some(val) => Ok(val.as_bytes().to_vec()),
-            None => Err(ExecError::UnknownVariable),
+            None => Err(ExecError::UnknownVariable(var)),
         }
     }
 
@@ -246,7 +246,9 @@ pub fn run(se: &mut Session, cmd: Vec<u8>) {
 
     let status_string = match result {
         Ok(_) => String::new(),
-        Err(ExecError::UnknownVariable) => String::from("unbound variable"),
+        Err(ExecError::UnknownVariable(var)) => {
+            format!("unbound variable: {}", String::from_utf8_lossy(&var))
+        }
         Err(ExecError::ExecError(i)) => i.to_string(),
     };
 
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