Doom: Font selection

Add Fira Code as default, but fallback to monospace if unavailable.

doom/config.el

@@ -20,13 +20,19 @@
 ;;
 ;; They all accept either a font-spec, font string ("Input Mono-12"), or xlfd
 ;; font string. You generally only need these two:
-(setq doom-font (font-spec :family "monospace" :size 14))
+(require 'cl-lib)
+
+(setq font-candidates
+      (list
+       (font-spec :family "Fira Code Regular Nerd Font Complete Mono")
+       (font-spec :family "monospace" :size 14)))
+
+(setq doom-font (cl-find-if #'find-font font-candidates))
 
 ;; There are two ways to load a theme. Both assume the theme is installed and
 ;; available. You can either set `doom-theme' or manually load a theme with the
 ;; `load-theme' function. This is the default:
 (setq doom-theme 'doom-one)
-
 ;; Initial frame size
 (add-to-list 'default-frame-alist '(width . 125))
 (add-to-list 'default-frame-alist '(height . 70))