From b677713a7caf179b144674ff4c6e6b7171ad1337 Mon Sep 17 00:00:00 2001
From: Jonas Maier <>
Date: Fri, 17 Apr 2026 17:56:58 +0200
Subject: aliases

---
 src/parse/mod.rs | 45 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 41 insertions(+), 4 deletions(-)

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

diff --git a/src/parse/mod.rs b/src/parse/mod.rs
index 8682f04..184a514 100644
--- a/src/parse/mod.rs
+++ b/src/parse/mod.rs
@@ -1,4 +1,4 @@
-use crate::BString;
+use crate::{BString, bstr};
 
 #[cfg(test)]
 mod test;
@@ -30,6 +30,17 @@ pub trait Expander {
     type Error;
     fn expand_var(&mut self, v: BString, default: Option<BString>) -> Res<BString, Self::Error>;
     fn expand_cmd(&mut self, c: Ast<PostExpansion>) -> Res<BString, Self::Error>;
+
+    type AliasAge;
+    fn expand_alias(
+        &mut self,
+        cmd: &bstr,
+        age: Option<Self::AliasAge>,
+    ) -> Res<Option<(Self::AliasAge, Vec<ExpString>)>, Self::Error> {
+        let _ = cmd;
+        let _ = age;
+        Ok(None)
+    }
 }
 
 #[derive(Debug, Clone, PartialEq)]
@@ -857,7 +868,30 @@ pub struct Command<T: Stage> {
 }
 
 impl Command<PreExpansion> {
-    fn expand<E: Expander>(self, e: &mut E) -> Res<Command<PostExpansion>, E::Error> {
+    fn full_alias_expansion<E: Expander>(&mut self, e: &mut E) -> Res<(), E::Error> {
+        self.args.reverse();
+        let mut age = None;
+
+        while self.cmd.parts.len() == 1
+            && let StringPart::Boring(s) = &self.cmd.parts[0]
+        {
+            if let Some((new_age, exp)) = e.expand_alias(&s, age.take())? {
+                age = Some(new_age);
+                self.cmd = exp.first().unwrap().clone();
+                for e in exp.into_iter().skip(1).rev() {
+                    self.args.push(e);
+                }
+            } else {
+                break;
+            }
+        }
+        self.args.reverse();
+
+        Ok(())
+    }
+
+    fn expand<E: Expander>(mut self, e: &mut E) -> Res<Command<PostExpansion>, E::Error> {
+        self.full_alias_expansion(e)?;
         let cmd = self.cmd.expand(e)?;
         let mut args = Vec::with_capacity(self.args.len());
         for arg in self.args.into_iter() {
@@ -999,8 +1033,11 @@ pub fn completion_context<E: Expander>(x: &[u8], e: &mut E) -> CompletionContext
     ast.completion(e)
 }
 
-trait Parse: Sized {
+pub trait Parse: Sized {
     fn parse(b: &mut Cursor<'_>) -> Result<Self>;
+    fn parse_from_bytes(x: &[u8]) -> Result<Self> {
+        Self::parse(&mut Cursor::new(x, ParseMode::Command))
+    }
 }
 
 enum ParseMode {
@@ -1008,7 +1045,7 @@ enum ParseMode {
     Completion,
 }
 
-struct Cursor<'a> {
+pub struct Cursor<'a> {
     buf: &'a [u8],
     mode: ParseMode,
 
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