From 965196972fa27237b6cb97209c915381a95a5bef Mon Sep 17 00:00:00 2001
From: Jonas Maier <>
Date: Tue, 17 Mar 2026 15:23:43 +0100
Subject: builtin to determine what completion would do

---
 src/parse/mod.rs   |  1 +
 src/run/builtin.rs | 27 +++++++++++++++++++++++++++
 src/run/mod.rs     |  1 +
 3 files changed, 29 insertions(+)

(limited to 'src')

diff --git a/src/parse/mod.rs b/src/parse/mod.rs
index eda89f1..e085f34 100644
--- a/src/parse/mod.rs
+++ b/src/parse/mod.rs
@@ -797,6 +797,7 @@ pub fn do_parse(x: &[u8]) -> Res<Ast<PreExpansion>, (ParseError, &[u8])> {
     }
 }
 
+#[derive(Debug)]
 pub enum CompletionKind {
     Command,
     Argument,
diff --git a/src/run/builtin.rs b/src/run/builtin.rs
index 141357f..f0cb999 100644
--- a/src/run/builtin.rs
+++ b/src/run/builtin.rs
@@ -375,6 +375,33 @@ impl Builtin for parse {
     }
 }
 
+pub struct completion;
+impl Builtin for completion {
+    fn name(&self) -> &str {
+        "completion"
+    }
+
+    fn io(
+        &self,
+        session: Arc<Mutex<Session>>,
+        args: &[BString],
+        _stdin: &mut dyn Read,
+        stdout: &mut dyn Write,
+    ) -> Result {
+        for arg in args {
+            let c = crate::completion(session.clone(), &arg);
+            write!(stdout, "{:?} ", c.kind)?;
+            stdout.write_all(&c.shared_prefix)?;
+            for s in c.suggestions {
+                stdout.write_all(b" ")?;
+                stdout.write_all(&s.display)?;
+            }
+            stdout.write_all(b"\n")?;
+        }
+        Ok(())
+    }
+}
+
 pub struct null;
 impl Builtin for null {
     fn name(&self) -> &str {
diff --git a/src/run/mod.rs b/src/run/mod.rs
index 1133ddb..2224eac 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -491,6 +491,7 @@ const BUILTINS: &[&'static dyn Builtin] = &[
     &builtin::parse,
     &builtin::null,
     &builtin::var,
+    &builtin::completion,
 ];
 
 pub fn builtin_map() -> HashMap<BString, &'static dyn Builtin> {
-- 
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