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.

docs/faq.org

@@ -248,8 +248,7 @@ Doom exposes a couple variables for setting fonts. They are:
 - [[var:doom-variable-pitch-font]]: used for non-monospace fonts (e.g. when using
   variable-pitch-mode or mixed-pitch-mode). Popular for text modes, like Org or
   Markdown.
-- [[var:doom-unicode-font]]: used for rendering unicode glyphs. Emacs defaults to
-  Symbola. It is ignored if the [[doom-module::ui unicode]] module is enabled.
+- [[var:doom-symbol-font]]: used for rendering symbols.
 - [[var:doom-serif-font]]: the sans-serif font to use wherever the [[face:fixed-pitch-serif]]
   face is used.
 - [[var:doom-big-font]]: the large font to use when [[fn:doom-big-font-mode]] is active.
@@ -267,7 +266,7 @@ For example:
 ;; in $DOOMDIR/config.el
 (setq doom-font (font-spec :family "JetBrainsMono" :size 12 :weight 'light)
       doom-variable-pitch-font (font-spec :family "DejaVu Sans" :size 13)
-      doom-unicode-font (font-spec :family "Symbola")
+      doom-symbol-font (font-spec :family "JuliaMono")
       doom-big-font (font-spec :family "JetBrainsMono" :size 24))
 #+end_src
 
@@ -524,7 +523,7 @@ Here are a few common causes for random crashes:
 
 - Some fonts cause Emacs to crash when they lack support for a particular glyph
   (typically symbols). Try changing your font by changing ~doom-font~ or
-  ~doom-unicode-font~.
+  ~doom-symbol-font~.
 
 - Ligatures can cause Emacs to crash. Try a different [[doom-module::ui ligatures +fira][ligature font]] or disable
   the [[doom-module::ui ligatures]] module altogether.

lisp/doom-ui.el

@@ -36,14 +36,16 @@ Must be a `font-spec', a font object, an XFT font string, or an XLFD string. See
 
 An omitted font size means to inherit `doom-font''s size.")
 
-(defvar doom-unicode-font nil
-  "Fallback font for Unicode glyphs.
+(defvar doom-symbol-font nil
+  "Fallback font for symbols.
 Must be a `font-spec', a font object, an XFT font string, or an XLFD string. See
 `doom-font' for examples. Emacs defaults to Symbola.
 
 WARNING: if you specify a size for this font it will hard-lock any usage of this
 font to that size. It's rarely a good idea to do so!")
 
+(define-obsolete-variable-alias 'doom-unicode-font 'doom-symbol-font "3.0.0")
+
 (defvar doom-emoji-fallback-font-families
   '("Apple Color Emoji"
     "Segoe UI Emoji"
@@ -525,11 +527,13 @@ windows, switch to `doom-fallback-buffer'. Otherwise, delegate to original
   (when (fboundp 'set-fontset-font)
     (let ((fn (doom-rpartial #'member (font-family-list))))
       (when-let (font (cl-find-if fn doom-symbol-fallback-font-families))
-        (set-fontset-font t 'symbol font))
+        (dolist (script '(symbol mathematical))
+          (set-fontset-font t script font)))
       (when-let (font (cl-find-if fn doom-emoji-fallback-font-families))
-        (set-fontset-font t 'emoji font))
-      (when doom-unicode-font
-        (set-fontset-font t 'unicode doom-unicode-font)))
+        (set-fontset-font t 'emoji font)))
+    (when doom-symbol-font
+      (dolist (script '(symbol mathematical))
+        (set-fontset-font t script doom-symbol-font)))
     ;; Nerd Fonts use these Private Use Areas
     (dolist (range '((#xe000 . #xf8ff) (#xf0000 . #xfffff)))
       (set-fontset-font t range "Symbols Nerd Font Mono")))

modules/README.org

@@ -1417,12 +1417,12 @@ 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.
 

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)))))

templates/config.example.el

@@ -15,7 +15,7 @@
 ;; - `doom-variable-pitch-font' -- a non-monospace font (where applicable)
 ;; - `doom-big-font' -- used for `doom-big-font-mode'; use this for
 ;;   presentations or streaming.
-;; - `doom-unicode-font' -- for unicode glyphs
+;; - `doom-symbol-font' -- for symbols
 ;; - `doom-serif-font' -- for the `fixed-pitch-serif' face
 ;;
 ;; See 'C-h v doom-font' for documentation and more examples of what they