From 9dba9742f4f2071fd85c67c3a7fe311b7f37617c Mon Sep 17 00:00:00 2001
From: Gabriel Schneider <gbrls@0x4200.cafe>
Date: Thu, 1 Oct 2026 17:50:26 -0300
Subject: Enter and Tab on a tag word tell an event reader as a click on it
 does, at its place in the tag; only a look takes a diff line's address, an
 exec there takes the word (follows vpmzwuzk)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 src/look.zig | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

(limited to 'src/look.zig')

diff --git a/src/look.zig b/src/look.zig
index 0df1f307..a2aa5be0 100644
--- a/src/look.zig
+++ b/src/look.zig
@@ -2524,6 +2524,68 @@ test "every entry point to Look takes one expansion: a diff line and a file:12:5
     }
 }
 
+test "a tag word looked at by a click and by Enter is one record to an event reader; an exec on a diff line takes its word, never the address" {
+    if (!platform_has_fs) return;
+    const diff_text =
+        \\diff --git a/src/x.zig b/src/x.zig
+        \\--- a/src/x.zig
+        \\+++ b/src/x.zig
+        \\@@ -1,1 +1,1 @@
+        \\-old
+        \\+line one
+        \\
+    ;
+    var fx: DiffFixture = undefined;
+    try fx.init(true, &.{.{ "src/x.zig", "line one\n" }}, diff_text);
+    defer fx.tmp.cleanup();
+    const th = @import("ninep/testing.zig");
+    const p = try Pardes.init(std.testing.allocator, .{ .cols = 100, .rows = 30 });
+    defer p.deinit();
+    const pane = try fx.open(p, diff_text);
+    pane.tag_expanded = true;
+    var frame = std.heap.ArenaAllocator.init(std.testing.allocator);
+    defer frame.deinit();
+    p.sync();
+    _ = try p.render(frame.allocator());
+
+    // An exec on the `+` of a hunk line takes the word there; a look, the
+    // address the line names.
+    pane.body.cur_row = 5;
+    pane.body.cur_col = 0;
+    try std.testing.expectEqualStrings("+line", exec.operandAt(p, pane, cursorWordSel(p, pane), false, false).text.?);
+    try std.testing.expectEqualStrings("src/x.zig:1", exec.operandAt(p, pane, cursorWordSel(p, pane), false, true).text.?);
+
+    // An event reader on the pane.
+    const event = pardes.ctlfs.Node.of(pane.serial, .event);
+    const opened = th.call(p, .{ .tag = 1, .op = .open, .node = event });
+    defer _ = th.call(p, .{ .tag = 9, .op = .release, .node = event, .handle = opened.reply.handle });
+    const tag = try tagline.tagText(p, p.scratch.allocator(), pane);
+    const at: u16 = @intCast(std.mem.lastIndexOf(u8, tag, "Del").?);
+    // A B3 click on the tag's Del, where the tag as shown has it...
+    const shown = (try tagline.shownTag(p, p.scratch.allocator(), pane)).text;
+    const shown_at = std.mem.lastIndexOf(u8, shown, "Del").?;
+    const shown_row: u16 = @intCast(std.mem.count(u8, shown[0..shown_at], "\n"));
+    const line_start = if (std.mem.lastIndexOfScalar(u8, shown[0..shown_at], '\n')) |nl| nl + 1 else 0;
+    const x = p.rects[0].x + TAG_TEXT_INSET + @as(u16, @intCast(panes.File.displayWidth(shown[line_start..shown_at]))) + 1;
+    const y = p.rects[0].y + shown_row;
+    p.update(.{ .mouse = .{ .button = .right, .kind = .press, .col = x, .row = y } });
+    p.update(.{ .mouse = .{ .button = .right, .kind = .release, .col = x, .row = y } });
+    var clicked_buf: [128]u8 = undefined;
+    const clicked = th.rd(p, event, 0, 4096).bytes;
+    @memcpy(clicked_buf[0..clicked.len], clicked);
+    // ...and Enter with the tag's cursor on it.
+    tagline.enterTag(p, pane);
+    pane.tag.mode = .normal;
+    pane.tag.cur_row = 0;
+    pane.tag.cur_col = at + 1;
+    p.update(.{ .key = .{ .cp = Key.enter } });
+    const keyed = th.rd(p, event, 0, 4096).bytes;
+    // The same record but for its origin, mouse or keyboard.
+    try std.testing.expect(clicked.len > 2);
+    try std.testing.expectEqualStrings(clicked_buf[1..clicked.len], keyed[1..]);
+    try std.testing.expect(p.panes[0] != null);
+}
+
 test "Look outside a diff pane expands and looks as ever" {
     const p = try Pardes.init(std.testing.allocator, .{ .cols = 100, .rows = 30 });
     defer p.deinit();
-- 
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