refactor: doom-unicode-font -> doom-symbol-font

No font supports all of Unicode or anywhere near it. It’s not even
really possible with current font formats. Therefore, rename
`doom-unicode-font` to `doom-symbol-font`. Only set it as a fallback for
characters in the `symbol` and `mathematical` scripts.

modules/ui/doom/README.org

@@ -71,13 +71,13 @@ core/core-ui.el has four relevant variables:
 - ~doom-big-font~ :: the font to use when ~doom-big-font-mode~ is enabled.
 - ~doom-variable-pitch-font~ :: the font to use when ~variable-pitch-mode~ is active
   (or where the ~variable-pitch~ face is used).
-- ~doom-unicode-font~ :: the font used to display unicode symbols. This is
+- ~doom-symbol-font~ :: the font used to display unicode symbols. This is
   ignored if the [[doom-module::ui unicode]] module is enabled.
 
 #+begin_src emacs-lisp
 (setq doom-font (font-spec :family "Fira Mono" :size 12)
       doom-variable-pitch-font (font-spec :family "Fira Sans")
-      doom-unicode-font (font-spec :family "DejaVu Sans Mono")
+      doom-symbol-font (font-spec :family "JuliaMono")
       doom-big-font (font-spec :family "Fira Mono" :size 19))
 #+end_src
 

modules/ui/ligatures/README.org

@@ -247,10 +247,9 @@ happen in all modes, you can use
 ** Some symbols are not rendering correctly
 This can usually be fixed by doing one of the following:
 
-- Make sure Symbola (the font) is installed on your system.
-- Otherwise, change [[var:doom-unicode-font]] (set to Symbola by default).
-- Disable the [[doom-module::ui unicode]] module. It not only overrides [[var:doom-unicode-font]], but
-  should only be used as a last resort.
+- Set [[var:doom-symbol-font]].
+- Disable the [[doom-module::ui unicode]] module. It overrides [[var:doom-symbol-font]]
+  and should only be used as a last resort.
 
 * Frequently asked questions
 /This module has no FAQs yet./ [[doom-suggest-faq:][Ask one?]]

modules/ui/unicode/README.org

@@ -13,12 +13,12 @@ emacs fontset to cover as many unicode glyphs as possible by scanning all
 available glyphs from all available fonts.
 
 When this module is enabled:
-- Emacs will prefer to use the ~doom-unicode-font~ font to display non-latin
+- Emacs will prefer to use the ~doom-symbol-font~ font to display non-latin
   glyphs if it provides coverage for them.
 - The first time you run Emacs a unicode cache will be generated -- this will
   take a while!
 - The cache will be regenerated every time Emacs is made aware of new fonts or
-  you change the font configuration e.g. by modifying ~doom-unicode-font~.
+  you change the font configuration e.g. by modifying ~doom-symbol-font~.
 - The cache will be stored and should not be regenerated unless font-related
   configuration or the versions of relevant packages changes.
 
@@ -54,16 +54,16 @@ When this module is enabled:
 #+end_quote
 
 The first font that will be analyzed to see if it contains the glyphs of
-non-latin characters will be ~doom-unicode-font~:
+non-latin characters will be ~doom-symbol-font~:
 #+begin_src emacs-lisp
 ;; in $DOOMDIR/config.el
-(setq doom-unicode-font (font-spec :family "Fira Mono"))
+(setq doom-symbol-font (font-spec :family "JuliaMono"))
 #+end_src
 
 If your ~doom-font~ provides good unicode coverage use:
 #+begin_src emacs-lisp
 ;; in $DOOMDIR/config.el
-(setq doom-unicode-font doom-font)
+(setq doom-symbol-font doom-font)
 #+end_src
 
 If your font does not provide some glyphs, this package will try its best to

modules/ui/unicode/autoload.el

@@ -12,14 +12,14 @@ necessary."
 (defun +unicode-setup-fonts-h (&optional frame)
   "Initialize `unicode-fonts', if in a GUI session.
 
-If doom-unicode-font is set, add it as preferred font for all unicode blocks."
+If doom-symbol-font is set, add it as a preferred font for all Unicode blocks."
   (when (and frame (display-multi-font-p frame))
     (with-selected-frame frame
       (require 'unicode-fonts)
-      (when doom-unicode-font
-        (let ((doom-unicode-font-family (plist-get (font-face-attributes doom-unicode-font) :family)))
+      (when doom-symbol-font
+        (let ((doom-symbol-font-family (plist-get (font-face-attributes doom-symbol-font) :family)))
           (dolist (unicode-block unicode-fonts-block-font-mapping)
-            (push doom-unicode-font-family (cadr unicode-block)))))
+            (push doom-symbol-font-family (cadr unicode-block)))))
       ;; NOTE: will impact startup time on first run
       (let (inhibit-redisplay inhibit-message)
         (unicode-fonts-setup)))))