From 5d8d9f07669cdc8ac17c866edb6a8c07bbe4221c Mon Sep 17 00:00:00 2001
From: Jonas Maier <jonas@x77.dev>
Date: Mon, 9 Mar 2026 20:49:53 +0100
Subject: variable default value

---
 src/run/mod.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'src/run/mod.rs')

diff --git a/src/run/mod.rs b/src/run/mod.rs
index c7414a8..e041066 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -305,7 +305,11 @@ impl Executor {
 impl parse::Expander for Executor {
     type Error = ExecError;
 
-    fn expand_var(&mut self, var: BString) -> Result<BString, Self::Error> {
+    fn expand_var(
+        &mut self,
+        var: BString,
+        default: Option<BString>,
+    ) -> Result<BString, Self::Error> {
         if var.is_empty() {
             return Err(ExecError::UnknownVariable(var));
         }
@@ -331,7 +335,10 @@ impl parse::Expander for Executor {
 
         match std::env::var_os(OsStr::from_bytes(&var)) {
             Some(val) => Ok(val.as_bytes().to_vec()),
-            None => Err(ExecError::UnknownVariable(var)),
+            None => match default {
+                Some(d) => Ok(d),
+                None => Err(ExecError::UnknownVariable(var)),
+            },
         }
     }
 
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