Route mouse thumb buttons to jump history

1 files changed, 29 insertions, 2 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 1dbe2e81..efd82474 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -4314,7 +4314,7 @@ test "normal header Enter executes its command rather than searching for it" {
 
 pub const Mouse = struct {
     // sel indexing relies on left/middle/right being 0/1/2
-    pub const Button = enum { left, middle, right, wheel_up, wheel_down, wheel_left, wheel_right, none };
+    pub const Button = enum { left, middle, right, wheel_up, wheel_down, wheel_left, wheel_right, none, back, forward };
     pub const Kind = enum { press, release, motion, drag };
     button: Button,
     kind: Kind,
@@ -10747,6 +10747,10 @@ pub const Pardes = struct {
     }
 
     fn handleMouse(p: *Pardes, m: Mouse) void {
+        if (m.button == .back or m.button == .forward) {
+            if (m.kind == .press) p.jumpBy(if (m.button == .back) -1 else 1);
+            return;
+        }
         const raw_col = @min(m.col, p.screen_w -| 1);
         const raw_row = @min(m.row, p.screen_h -| 1);
         p.pointer_raw_col = raw_col;
@@ -10842,7 +10846,7 @@ pub const Pardes = struct {
         }
 
         switch (m.button) {
-            .none => {}, // hover tracked above; motion has no other meaning
+            .none, .back, .forward => {}, // hover and navigation handled above
             .wheel_up, .wheel_down => {
                 if (m.kind != .press) return;
                 // re-arms the drift guard below; vertical always scrolls, so
@@ -13948,3 +13952,26 @@ test "jump history terminal rectangle follows output and clears on reflow" {
     try std.testing.expect(pane.pointerSelection(pane.sel[0]) == null);
     try std.testing.expectEqual(.none, pane.sel[0].state);
 }
+
+test "mouse thumb buttons navigate once without disturbing selection gestures" {
+    const p = try Pardes.init(std.testing.allocator, .{ .cols = 60, .rows = 12 });
+    defer p.deinit();
+    const pane = try p.setTestFile("alpha beta\ngamma delta\nepsilon zeta\n");
+    pane.setRange(pane.file.?.content, 0, .{ .anchor = 1, .head = 5 }, true);
+    const selection = pane.primaryRange(pane.file.?.content, 0);
+    p.njumps = 3;
+    p.jcur = 2;
+    for (0..3) |i| p.jumps[i] = .{ .pane = 0, .serial = pane.serial, .line = @intCast(i + 1), .col = 1 };
+    p.drag = .{ .select = .{ .id = 0, .button = config.select_button } };
+    const drag = p.drag;
+    p.update(.{ .mouse = .{ .button = .back, .kind = .press, .col = 0, .row = 0 } });
+    try std.testing.expectEqual(@as(usize, 1), p.jcur);
+    for ([_]Mouse.Kind{ .drag, .release, .motion }) |kind|
+        p.update(.{ .mouse = .{ .button = .back, .kind = kind, .col = 0, .row = 0 } });
+    try std.testing.expectEqual(@as(usize, 1), p.jcur);
+    p.update(.{ .mouse = .{ .button = .forward, .kind = .press, .col = 0, .row = 0 } });
+    p.update(.{ .mouse = .{ .button = .forward, .kind = .release, .col = 0, .row = 0 } });
+    try std.testing.expectEqual(@as(usize, 2), p.jcur);
+    try std.testing.expectEqualDeep(selection, pane.primaryRange(pane.file.?.content, 0));
+    try std.testing.expectEqualDeep(drag, p.drag);
+}