From 81759dd51eb1f6f9a7dc8af9b2b8126ff7dfab24 Mon Sep 17 00:00:00 2001
From: Jonas Maier <jonas@x77.dev>
Date: Sun, 31 May 2026 19:21:44 +0200
Subject: regex based case statements

---
 src/run/builtin.rs | 31 ++++++++++++++++++++++++++++++-
 src/run/mod.rs     |  7 +++++--
 2 files changed, 35 insertions(+), 3 deletions(-)

(limited to 'src/run')

diff --git a/src/run/builtin.rs b/src/run/builtin.rs
index fab7565..6f7cc5d 100644
--- a/src/run/builtin.rs
+++ b/src/run/builtin.rs
@@ -1098,7 +1098,36 @@ mod dbg {
             Ok(())
         }
     }
+
+    #[derive(Copy, Clone)]
+    pub struct case_match;
+    impl Builtin for case_match {
+        fn name(&self) -> &str {
+            "case_match"
+        }
+    
+        fn io(
+            &self,
+            _session: Arc<Mutex<Session>>,
+            args: &[BString],
+            _stdin: &mut dyn Read,
+            stdout: &mut dyn Write,
+        ) -> Result {
+            let regex = match crate::parse::regex::Pattern::parse_from_bytes(&args[0]) {
+                Ok(r) => r,
+                Err(e) => {
+                    writeln!(stdout, "not a valid regex: {e:?}")?;
+                    return Err(Error::Exit(1));
+                },
+            };
+
+            let compiled = regex.compile();
+            writeln!(stdout, "{compiled:?}")?;
+
+            Ok(())
+        }
+    }
 }
 
 #[cfg(debug_assertions)]
-pub use dbg::{debug, re};
+pub use dbg::{debug, re, case_match};
diff --git a/src/run/mod.rs b/src/run/mod.rs
index f86278d..c3ceb76 100644
--- a/src/run/mod.rs
+++ b/src/run/mod.rs
@@ -456,8 +456,9 @@ impl Executor {
         stdout: OutputWriter,
     ) -> SpawnedCmd {
         for branch in c.branches.into_iter() {
-            // TODO: regex case patterns
-            if branch.pattern == c.discriminant {
+            // TODO: do not compile every time
+            let compiled = branch.pattern.compile();
+            if compiled.matches(&c.discriminant) {
                 return self.execute_block(branch.block, stdin, stdout);
             }
         }
@@ -732,6 +733,8 @@ const BUILTINS: &[&'static dyn BuiltinClone] = &[
     &builtin::logo,
     &builtin::export,
     &builtin::pish_theme,
+    #[cfg(debug_assertions)]
+    &builtin::case_match,
 ];
 
 pub fn builtin_map() -> HashMap<BString, &'static dyn BuiltinClone> {
-- 
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