Grep with no hit says grep: no match, and a pane directory that is not there is passed over

Grep walks every pane's directory; one not there (a scratch named into a
directory not made yet) failed the whole search with `file not found`.
Such a root is passed over now, and a search that finds nothing says
`grep: no match` and opens no empty +Search.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 1ef9a2f6..330b9cb7 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -1819,6 +1819,29 @@ test "a builtin that needs its argument, written bare to an exec, is EINVAL as t
     }
 }
 
+test "Grep with no hit says grep: no match and opens nothing, a missing pane directory passed over" {
+    const p = try withFile(testing.allocator, "x\n");
+    defer p.deinit();
+    var tmp = testing.tmpDir(.{});
+    defer tmp.cleanup();
+    try tmp.dir.writeFile(testing.io, .{ .sub_path = "a.txt", .data = "alpha\n" });
+    var dir_buf: [4096]u8 = undefined;
+    const dir = dir_buf[0..try tmp.dir.realPath(testing.io, &dir_buf)];
+    var line: [4200]u8 = undefined;
+    _ = wr(p, Node.of(serialOf(p), .name), try std.fmt.bufPrint(&line, "{s}/a.txt\n", .{dir}));
+    // A second pane in a directory that is not there.
+    const other = try th.newPane(p);
+    _ = wr(p, Node.of(other, .name), "/tmp/pardes-no-such-dir-zz/b.txt\n");
+    var count: usize = 0;
+    for (p.panes) |slot| count += @intFromBool(slot != null);
+    const missed = wr(p, Node.of(serialOf(p), .exec), "Grep zzqqnomatchzz\n");
+    try testing.expectEqual(E.IO, missed.errno());
+    try testing.expectEqualStrings("grep: no match", missed.reply.ename);
+    var after: usize = 0;
+    for (p.panes) |slot| after += @intFromBool(slot != null);
+    try testing.expectEqual(count, after);
+}
+
 test "size is monotonic: growing is never refused, and a size once taken is taken again" {
     const p = try Pardes.init(testing.allocator, .{ .tty_only = true, .cols = 160, .rows = 60 });
     defer p.deinit();