Show tab-line when tab-line-mode is enabled

exwm-core.el

@@ -222,6 +222,7 @@ Return a three element list with the respective results."
 (defvar-local exwm--frame nil)            ;workspace frame
 (defvar-local exwm--floating-frame nil)   ;floating frame
 (defvar-local exwm--mode-line-format nil) ;save mode-line-format
+(defvar-local exwm--tab-line-format nil) ;save tab-line-format
 (defvar-local exwm--floating-frame-position nil) ;set when hidden.
 (defvar-local exwm--fixed-size nil)              ;fixed size
 (defvar-local exwm--selected-input-mode 'line-mode

exwm-floating.el

@@ -271,6 +271,8 @@ context of the corresponding buffer."
                                           'floating-mode-line))
            (floating-header-line (plist-get exwm--configurations
                                             'floating-header-line))
+           (floating-tab-line (plist-get exwm--configurations
+                                         'floating-tab-line))
            (border-pixel (exwm--color->pixel exwm-floating-border-color)))
       (if floating-mode-line
           (setq exwm--mode-line-format (or exwm--mode-line-format
@@ -296,6 +298,12 @@ context of the corresponding buffer."
           (setq frame-height (- frame-height (window-header-line-height
                                               (frame-root-window frame)))
                 header-line-format nil)))
+
+      ;; Hide tab-line by default but override with floating-tab-line.
+      (setq exwm--tab-line-format (or exwm--tab-line-format
+                                      tab-line-format)
+            tab-line-format floating-tab-line)
+
       (set-frame-size frame frame-width frame-height t)
       ;; Create the frame container as the parent of the frame.
       (xcb:+request exwm--connection
@@ -438,6 +446,13 @@ context of the corresponding buffer."
                                          mode-line-format)
               mode-line-format (plist-get exwm--configurations
                                           'tiling-mode-line)))
+      (if (not (plist-member exwm--configurations 'tiling-tab-line))
+          (when exwm--tab-line-format
+            (setq tab-line-format exwm--tab-line-format))
+        (setq exwm--tab-line-format (or exwm--tab-line-format
+                                         tab-line-format)
+              tab-line-format (plist-get exwm--configurations
+                                         'tiling-tab-line)))
       (if (not (plist-member exwm--configurations 'tiling-header-line))
           (setq header-line-format nil)
         (setq header-line-format (plist-get exwm--configurations

exwm-layout.el

@@ -114,6 +114,8 @@
          (height (- (pop edges) y))
          frame-x frame-y frame-width frame-height)
     (with-current-buffer (exwm--id->buffer id)
+      (when tab-line-format
+        (setq y (+ y (window-tab-line-height window))))
       (when exwm--floating-frame
         (setq frame-width (frame-pixel-width exwm--floating-frame)
               frame-height (+ (frame-pixel-height exwm--floating-frame)
@@ -590,6 +592,52 @@ See also `exwm-layout-enlarge-window'."
         (exwm-layout-hide-mode-line)
       (exwm-layout-show-mode-line))))
 
+;;;###autoload
+(defun exwm-layout-hide-tab-line ()
+  "Hide tab-line."
+  (interactive)
+  (exwm--log)
+  (when (and (derived-mode-p 'exwm-mode) tab-line-format)
+    (let (tab-line-height)
+      (when exwm--floating-frame
+        (setq tab-line-height (window-tab-line-height
+                                (frame-root-window exwm--floating-frame))))
+      (setq exwm--tab-line-format tab-line-format
+            tab-line-format nil)
+      (if (not exwm--floating-frame)
+          (exwm-layout--show exwm--id)
+        (set-frame-height exwm--floating-frame
+                          (- (frame-pixel-height exwm--floating-frame)
+                             tab-line-height)
+                          nil t)))))
+
+;;;###autoload
+(defun exwm-layout-show-tab-line ()
+  "Show tab-line."
+  (interactive)
+  (exwm--log)
+  (when (and (derived-mode-p 'exwm-mode) (not tab-line-format))
+    (setq tab-line-format exwm--tab-line-format
+          exwm--tab-line-format nil)
+    (if (not exwm--floating-frame)
+        (exwm-layout--show exwm--id)
+      (set-frame-height exwm--floating-frame
+                        (+ (frame-pixel-height exwm--floating-frame)
+                           (window-tab-line-height (frame-root-window
+                                                    exwm--floating-frame)))
+                        nil t)
+      (call-interactively #'exwm-input-grab-keyboard))))
+
+;;;###autoload
+(defun exwm-layout-toggle-tab-line ()
+  "Toggle the display of tab-line."
+  (interactive)
+  (exwm--log)
+  (when (derived-mode-p 'exwm-mode)
+    (if tab-line-format
+        (exwm-layout-hide-tab-line)
+      (exwm-layout-show-tab-line))))
+
 (defun exwm-layout--init ()
   "Initialize layout module."
   ;; Auto refresh layout

exwm-manage.el

@@ -60,6 +60,8 @@ possible choices:
 * fullscreen: Force full screen (non-nil) on startup.
 * floating-mode-line: `mode-line-format' used when floating.
 * tiling-mode-line: `mode-line-format' used when tiling.
+* floating-tab-line: `tab-line-format' used when floating.
+* tiling-tab-line: `tab-line-format' used when tiling.
 * floating-header-line: `header-line-format' used when floating.
 * tiling-header-line: `header-line-format' used when tiling.
 * char-mode: Force char-mode (non-nil) on startup.
@@ -87,6 +89,9 @@ want to match against EXWM internal variables such as `exwm-title',
                         ((const :tag "Floating mode-line" floating-mode-line)
                          sexp)
                         ((const :tag "Tiling mode-line" tiling-mode-line) sexp)
+                        ((const :tag "Floating tab-line" floating-tab-line)
+                         sexp)
+                        ((const :tag "Tiling tab-line" tiling-tab-line) sexp)
                         ((const :tag "Floating header-line"
                                 floating-header-line)
                          sexp)