`@pN:` looks at pane N, its trailing colon dropped as any look's is, and a line past the end is said one way: `<file>:N has no line N`, for `:N` as for `file:N`

lookAt dropped a trailing `:` from what it read but resolved the target
from the text as written, so `@p33:` was `no match for "@p33:"`. And
`:99999` said `address out of range` while `file:99999` said `has no
line 99999`: a bare line number past the end now says the latter too.

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

1 files changed, 16 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 1bf916a9..70ed51a7 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -4149,3 +4149,19 @@ test "Edit on an image pane is refused as a data write there is, EINVAL, before
     try testing.expectEqualStrings(data.reply.ename, edit.reply.ename);
     try testing.expectEqual(E.INVAL, wr(p, Node.of(doc.serial, .name), "/tmp/other.ppm\n").errno());
 }
+
+test "`@pN:` looks at pane N as `a.txt:` looks at a.txt, and a line past the end is said one way, `:N` or `file:N`" {
+    const p = try withFile(testing.allocator, "one\ntwo\n");
+    defer p.deinit();
+    const s = serialOf(p);
+    var buf: [64]u8 = undefined;
+    p.look_missed = false;
+    pardes.look.lookAt(p, 0, try std.fmt.bufPrint(&buf, "@p{d}:", .{s}));
+    try testing.expect(!p.look_missed);
+    const f = pane_files.fileOf(p.panes[0].?).?;
+    for ([_][]const u8{ ":99999", try std.fmt.bufPrint(&buf, "{s}:99999", .{f.path}) }) |looked| {
+        pardes.look.lookAt(p, 0, looked);
+        const said = p.panes[0].?.msg[0..p.panes[0].?.msg_len];
+        try testing.expect(std.mem.endsWith(u8, said, "/test.txt:99999 has no line 99999"));
+    }
+}