Prefer telephone-line to doom-modeline

After growing frustrated with doom-modeline's compatibility with my EXWM setup,
I decided to borrow @tazjin's setup, which I find to be much more appealing.

3 files changed, 67 insertions, 4 deletions

diff --git a/emacs/.emacs.d/wpc/modeline.el b/emacs/.emacs.d/wpc/modeline.el
new file mode 100644
index 000000000000..a2dbde6d6f2d
--- /dev/null
+++ b/emacs/.emacs.d/wpc/modeline.el
@@ -0,0 +1,64 @@
+;;; modeline.el --- Customize my Emacs mode-line -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Because I use EXWM, I treat my Emacs mode-line like my system bar: I need to
+;; quickly check the system time, and I expect it to be at the bottom-right of
+;; my Emacs frame. I used doom-modeline for awhile, which is an impressive
+;; package, but it conditionally colorizes on the modeline for the active
+;; buffer. So if my bottom-right window is inactive, I cannot see the time.
+;;
+;; My friend, @tazjin, has a modeline setup that I think is more compatible with
+;; EXWM, so I'm going to base my setup off of his.
+
+(use-package telephone-line)
+
+(defun modeline/bottom-right-window? ()
+  "Determines whether the last (i.e. bottom-right) window of the
+  active frame is showing the buffer in which this function is
+  executed."
+  (let* ((frame (selected-frame))
+         (right-windows (window-at-side-list frame 'right))
+         (bottom-windows (window-at-side-list frame 'bottom))
+         (last-window (car (seq-intersection right-windows bottom-windows))))
+    (eq (current-buffer) (window-buffer last-window))))
+
+(defun modeline/maybe-render-time ()
+  "Renders the mode-line-misc-info string for display in the
+  mode-line if the currently active window is the last one in the
+  frame.
+
+  The idea is to not display information like the current time,
+  load, battery levels on all buffers."
+  (when (modeline/bottom-right-window?)
+    (telephone-line-raw mode-line-misc-info t)))
+
+(defun modeline/setup ()
+  "Render my custom modeline."
+  (telephone-line-defsegment telephone-line-last-window-segment ()
+    (modeline/maybe-render-time))
+  ;; Display the current EXWM workspace index in the mode-line
+  (telephone-line-defsegment telephone-line-exwm-workspace-index ()
+    (when (modeline/bottom-right-window?)
+      (format "[%s]" exwm-workspace-current-index)))
+  ;; Define a highlight font for ~ important ~ information in the last
+  ;; window.
+  (defface special-highlight '((t (:foreground "white" :background "#5f627f"))) "")
+  (add-to-list 'telephone-line-faces
+               '(highlight . (special-highlight . special-highlight)))
+  (setq telephone-line-lhs
+        '((nil . (telephone-line-position-segment))
+          (accent . (telephone-line-buffer-segment))))
+  (setq telephone-line-rhs
+        '((accent . (telephone-line-major-mode-segment))
+          (nil . (telephone-line-last-window-segment
+                  telephone-line-exwm-workspace-index))))
+  (setq telephone-line-primary-left-separator 'telephone-line-tan-left
+        telephone-line-primary-right-separator 'telephone-line-tan-right
+        telephone-line-secondary-left-separator 'telephone-line-tan-hollow-left
+        telephone-line-secondary-right-separator 'telephone-line-tan-hollow-right)
+
+  (telephone-line-mode 1))
+
+(provide 'modeline)
+;; modeline.el ends here
diff --git a/emacs/.emacs.d/wpc/wpc-ui.el b/emacs/.emacs.d/wpc/wpc-ui.el
index 7b8e2eb9bc11..1243feb0aa38 100644
--- a/emacs/.emacs.d/wpc/wpc-ui.el
+++ b/emacs/.emacs.d/wpc/wpc-ui.el
@@ -15,6 +15,7 @@
 (require 'themes)
 (require 'device)
 (require 'laptop-battery)
+(require 'modeline)
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Configuration
@@ -175,9 +176,7 @@
 ;; Load a theme
 (themes/set "Solarized Light")
 
-;; Use the Doom modeline
-(use-package 'doom-modeline)
-(doom-modeline-mode 1)
+(modeline/setup)
 
 (provide 'wpc-ui)
 ;;; wpc-ui.el ends here
diff --git a/emacs/default.nix b/emacs/default.nix
index 293c7d4da4e9..0003777eda5a 100644
--- a/emacs/default.nix
+++ b/emacs/default.nix
@@ -47,7 +47,7 @@ let
       flycheck
       diminish
       doom-themes
-      doom-modeline
+      telephone-line
       neotree # TODO: Remove this dependency from my config.
       which-key
       ivy