feat(ui): change macOS GUI font from Monaco to Menlo

Also force-disable bold font-weights, as they're a bit annoying.

core/siren-core-macos.el

@@ -22,7 +22,7 @@
 ;; When running in GUI mode.
 (when window-system
   ;; Set default font
-  (set-face-attribute 'default nil :family "Monaco" :height 120)
+  (set-face-attribute 'default nil :family "Menlo" :height 120)
 
   ;; Fix the default default-directory value.
   (if (string= default-directory "/")

core/siren-core-themes.el

@@ -10,5 +10,19 @@
   "Root directory for Emacs Siren custom themes.")
 (add-to-list 'custom-theme-load-path siren-themes-dir)
 
+;; Globally disable setting face weight to bold.
+(defvar siren-set-face-ignore-attributes '(:weight))
+(defadvice set-face-attribute
+    (before ignore-attributes (face frame &rest args) activate)
+  (setq args
+        (apply 'nconc
+               (mapcar (lambda (i)
+                         (let ((attribute (nth i args))
+                               (value (nth (1+ i) args)))
+                           (if (not (memq attribute
+                                          siren-set-face-ignore-attributes))
+                               (list attribute value))))
+                       (number-sequence 0 (1- (length args)) 2)))))
+
 (provide 'siren-core-themes)
 ;;; siren-core-themes.el ends here