Repl's unknown-language refusal names a few whole and points to the rest

The refusal listed every language and was clipped to fit, ending mid-word.
It now names six, those that start as the word did first (pithon:
python), says how many more, and points at docs/tags.md, which lists them
all.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index dd382290..5921198e 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -1514,3 +1514,12 @@ test "size sets the screen of a session no frontend is attached to, and only of
     try testing.expect(std.mem.indexOf(u8, wr(p, root_ctl, "size 80 8\n").reply.ename, "too small for the panes") != null);
     try testing.expectEqual(@as(u16, 40), p.screen_h);
 }
+
+test "Repl with no such language names a few whole, and where the rest are" {
+    const p = try th.withTerm(testing.allocator);
+    defer p.deinit();
+    const refused = wr(p, Node.of(serialOf(p), .ctl), "Repl zzlang\n");
+    try testing.expectEqual(Status.err, refused.reply.status);
+    try testing.expect(std.mem.indexOf(u8, refused.reply.ename, "Repl: no language \"zzlang\"; - or one like zig ada bash c c_sharp clojure (") != null);
+    try testing.expect(std.mem.indexOf(u8, refused.reply.ename, " more: docs/tags.md, Repl)") != null);
+}