can read cli args

1 files changed, 17 insertions, 1 deletions

diff --git a/src/run/mod.rs b/src/run/mod.rs
index 4970792..f32007e 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -229,8 +229,24 @@ impl parse::Expander for Executor {
     type Error = ExecError;
 
     fn expand_var(&mut self, var: BString) -> Result<BString, Self::Error> {
+        if var.is_empty() {
+            return Err(ExecError::UnknownVariable(var));
+        }
+
+        if var[0].is_ascii_digit() {
+            if let Some(x) = String::from_utf8(var.clone())
+                .ok()
+                .and_then(|x| x.parse::<usize>().ok())
+            {
+                match std::env::args_os().skip(x).next() {
+                    Some(arg) => return Ok(arg.into_encoded_bytes()),
+                    None => (),
+                }
+            }
+        }
+
         if let Some(val) = self.se.lock().unwrap().vars.get(&var) {
-            return Ok(val.clone())
+            return Ok(val.clone());
         }
 
         match std::env::var_os(OsStr::from_bytes(&var)) {