1 files changed, 9 insertions, 0 deletions
diff --git a/src/exec.zig b/src/exec.zig
index aee2e1e5..2b0c90cb 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -733,6 +733,15 @@ pub fn commandText(txt: []const u8) []const u8 {
     return cmd;
 }
 
+/// The builtin a command line's first word names, as acme's lookup reads
+/// only the first word (editors/acme/exec.c, lookup): what an event's
+/// flag 1 says.
+pub fn namesBuiltin(txt: []const u8) bool {
+    const cmd = commandText(txt);
+    const end = std.mem.indexOfAny(u8, cmd, " \t") orelse cmd.len;
+    return std.meta.stringToEnum(Builtin, cmd[0..end]) != null;
+}
+
 pub fn executeBuiltinLine(p: *Pardes, id: usize, txt: []const u8) bool {
     const cmd = commandText(txt);
     if (cmd.len == 0 or p.exec_depth >= max_exec_depth) return false;