parameterize close_tab

- Add mode (`this`/`other`) parameter to `close_tab` keybind/apprt action.
- Keybinds will default to `this` if not specified, eliminating backward
  compatibility issues (`keybind=x=close_tab` === `keybind=x=close_tab:this`).
- Remove `close_other_tabs` keybind and apprt action.

src/input/Binding.zig

@@ -552,17 +552,17 @@ pub const Action = union(enum) {
     /// of the `confirm-close-surface` configuration setting.
     close_surface,
 
-    /// Close the current tab and all splits therein.
+    /// Close the current tab and all splits therein _or_ close all tabs and
+    /// splits thein of tabs _other_ than the current tab, depending on the
+    /// mode.
+    ///
+    /// If the mode is not specified, defaults to closing the current tab.
+    ///
+    /// close-tab:other is only available on macOS.
     ///
     /// This might trigger a close confirmation popup, depending on the value
     /// of the `confirm-close-surface` configuration setting.
-    close_tab,
-
-    /// Close all tabs other than the currently focused one within the same
-    /// window.
-    ///
-    /// Only available on macOS currently.
-    close_other_tabs,
+    close_tab: CloseTabMode,
 
     /// Close the current window and all tabs and splits therein.
     ///
@@ -864,6 +864,13 @@ pub const Action = union(enum) {
         hide,
     };
 
+    pub const CloseTabMode = enum {
+        this,
+        other,
+
+        pub const default: CloseTabMode = .this;
+    };
+
     fn parseEnum(comptime T: type, value: []const u8) !T {
         return std.meta.stringToEnum(T, value) orelse return Error.InvalidFormat;
     }
@@ -1058,7 +1065,6 @@ pub const Action = union(enum) {
             .write_selection_file,
             .close_surface,
             .close_tab,
-            .close_other_tabs,
             .close_window,
             .toggle_maximize,
             .toggle_fullscreen,

src/input/command.zig

@@ -375,12 +375,6 @@ fn actionCommands(action: Action.Key) []const Command {
             .description = "Show the on-screen keyboard if present.",
         }},
 
-        .close_other_tabs => comptime &.{.{
-            .action = .close_other_tabs,
-            .title = "Close Other Tabs",
-            .description = "Close all tabs in this window except the current one.",
-        }},
-
         .open_config => comptime &.{.{
             .action = .open_config,
             .title = "Open Config",
@@ -399,11 +393,27 @@ fn actionCommands(action: Action.Key) []const Command {
             .description = "Close the current terminal.",
         }},
 
-        .close_tab => comptime &.{.{
-            .action = .close_tab,
-            .title = "Close Tab",
-            .description = "Close the current tab.",
-        }},
+        .close_tab => comptime if (builtin.target.os.tag.isDarwin())
+            &.{
+                .{
+                    .action = .{ .close_tab = .this },
+                    .title = "Close Tab",
+                    .description = "Close the current tab.",
+                },
+                .{
+                    .action = .{ .close_tab = .other },
+                    .title = "Close Other Tabs",
+                    .description = "Close all tabs in this window except the current one.",
+                },
+            }
+        else
+            &.{
+                .{
+                    .action = .{ .close_tab = .this },
+                    .title = "Close Tab",
+                    .description = "Close the current tab.",
+                },
+            },
 
         .close_window => comptime &.{.{
             .action = .close_window,