GNU ELPA - fontaine

Copyright (C) 2022-2023 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with the Front-Cover Texts being “A GNU Manual,” and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled “GNU Free Documentation License.”

(a) The FSF’s Back-Cover Text is: “You have the freedom to copy and modify this GNU manual.”

Fontaine lets the user specify presets of font configurations and set them on demand on graphical Emacs frames. The user option fontaine-presets holds all such presets.

Presets consist of a list of properties that govern the family, weight, height, and slant of the faces listed in the value of the variable fontaine-faces.

Each preset is identified by a user-defined symbol as the car of a property list. It looks like this (check the default value of fontaine-presets for how everything is pieced together):

(regular
 ;; I keep all properties for didactic purposes, but most can be
 ;; omitted.  See the fontaine manual for the technicalities:
 ;; <https://protesilaos.com/emacs/fontaine>.
 :default-family "Monospace"
 :default-weight regular
 :default-slant normal
 :default-width normal
 :default-height 100

 :fixed-pitch-family nil
 :fixed-pitch-weight nil
 :fixed-pitch-slant nil
 :fixed-pitch-width nil
 :fixed-pitch-height 1.0

 :fixed-pitch-serif-family nil
 :fixed-pitch-serif-weight nil
 :fixed-pitch-serif-slant nil
 :fixed-pitch-serif-width nil
 :fixed-pitch-serif-height 1.0

 :variable-pitch-family "Sans"
 :variable-pitch-weight nil
 :variable-pitch-slant nil
 :variable-pitch-width nil
 :variable-pitch-height 1.0

 :mode-line-active-family nil
 :mode-line-active-weight nil
 :mode-line-active-slant nil
 :mode-line-active-width nil
 :mode-line-active-height 1.0

 :mode-line-inactive-family nil
 :mode-line-inactive-weight nil
 :mode-line-inactive-slant nil
 :mode-line-inactive-width nil
 :mode-line-inactive-height 1.0

 :header-line-family nil
 :header-line-weight nil
 :header-line-slant nil
 :header-line-width nil
 :header-line-height 1.0

 :line-number-family nil
 :line-number-weight nil
 :line-number-slant nil
 :line-number-width nil
 :line-number-height 1.0

 :tab-bar-family nil
 :tab-bar-weight nil
 :tab-bar-slant nil
 :tab-bar-width nil
 :tab-bar-height 1.0

 :tab-line-family nil
 :tab-line-weight nil
 :tab-line-slant nil
 :tab-line-width nil
 :tab-line-height 1.0

 :bold-family nil
 :bold-slant nil
 :bold-weight bold
 :bold-width nil
 :bold-height 1.0

 :italic-family nil
 :italic-weight nil
 :italic-slant italic
 :italic-width nil
 :italic-height 1.0

 :line-spacing nil)

Multiple presets form an alist (a list of lists), like this:

'((regular
   :default-family "Monospace"
   ;; More properties here
   )
  (medium
   :default-family "Iosevka Comfy Wide")
  ;; More presets here
  )

The doc string of fontaine-presets explains all properties in detail and documents some important caveats or information about font settings in Emacs.

Shared and implicit fallback values for presets.

The command fontaine-set-preset applies the desired preset. If called interactively, it produces a minibuffer prompt with completion among the available presets. When called from Lisp, it requires a PRESET argument, such as:

(fontaine-set-preset 'regular)

The default behaviour of fontaine-set-preset is to change fonts across all graphical frames. The user can, however, limit the changes to a given frame. For interactive use, this is done by invoking the command with a universal prefix argument (C-u by default), which changes fonts only in the current frame. When used in Lisp, the FRAME argument can be a frame object (satisfies framep) or a non-nil value: the former applies the effects to the given object, while the latter means the current frame and thus is the same as interactively supplying the prefix argument.

As a final step, fontaine-set-preset calls the fontaine-set-preset-hook.

The latest value of fontaine-set-preset is stored in a file whose location is defined in fontaine-latest-state-file (normally part of the .emacs.d directory). Saving is done by the function fontaine-store-latest-preset, which should be assigned to a hook (e.g. kill-emacs-hook). To restore that value, the user can call the function fontaine-restore-latest-preset (such as by adding it to their init file).

The command fontaine-toggle-preset can toggle between the last two valid presets, as set by fontaine-set-preset. If it cannot find two different presets, then it prompts using minibuffer completion. As a final step, it calls the fontaine-set-preset-hook.

For users of the no-littering package, fontaine-latest-state-file is not stored in their .emacs.d, but in a standard directory instead: https://github.com/emacscollective/no-littering.

As for the name of this package, it is the French word for “fountain” which, in turn, is what the font or source is. However, I will not blame you if you can only interpret it as a descriptive acronym: FONTs Are Irrelevant in Non-graphical Emacs (because that is actually true).

Remember to read the relevant doc strings.

(require 'fontaine)

(setq fontaine-latest-state-file
      (locate-user-emacs-file "fontaine-latest-state.eld"))

;; Iosevka Comfy is my highly customised build of Iosevka with
;; monospaced and duospaced (quasi-proportional) variants as well as
;; support or no support for ligatures:
;; <https://github.com/protesilaos/iosevka-comfy>.
(setq fontaine-presets
      '((small
	 :default-family "Iosevka Comfy Motion"
	 :default-height 80
	 :variable-pitch-family "Iosevka Comfy Duo")
	(regular) ; like this it uses all the fallback values and is named `regular'
	(medium
	 :default-weight semilight
	 :default-height 115
	 :bold-weight extrabold)
	(large
	 :inherit medium
	 :default-height 150)
	(presentation
	 :default-height 180)
	(t
	 ;; I keep all properties for didactic purposes, but most can be
	 ;; omitted.  See the fontaine manual for the technicalities:
	 ;; <https://protesilaos.com/emacs/fontaine>.
	 :default-family "Iosevka Comfy"
	 :default-weight regular
	 :default-height 100

	 :fixed-pitch-family nil ; falls back to :default-family
	 :fixed-pitch-weight nil ; falls back to :default-weight
	 :fixed-pitch-height 1.0

	 :fixed-pitch-serif-family nil ; falls back to :default-family
	 :fixed-pitch-serif-weight nil ; falls back to :default-weight
	 :fixed-pitch-serif-height 1.0

	 :variable-pitch-family "Iosevka Comfy Motion Duo"
	 :variable-pitch-weight nil
	 :variable-pitch-height 1.0

	 :mode-line-active-family nil ; falls back to :default-family
	 :mode-line-active-weight nil ; falls back to :default-weight
	 :mode-line-active-height 0.9

	 :mode-line-inactive-family nil ; falls back to :default-family
	 :mode-line-inactive-weight nil ; falls back to :default-weight
	 :mode-line-inactive-height 0.9

	 :header-line-family nil ; falls back to :default-family
	 :header-line-weight nil ; falls back to :default-weight
	 :header-line-height 0.9

	 :line-number-family nil ; falls back to :default-family
	 :line-number-weight nil ; falls back to :default-weight
	 :line-number-height 0.9

	 :tab-bar-family nil ; falls back to :default-family
	 :tab-bar-weight nil ; falls back to :default-weight
	 :tab-bar-height 1.0

	 :tab-line-family nil ; falls back to :default-family
	 :tab-line-weight nil ; falls back to :default-weight
	 :tab-line-height 1.0

	 :bold-family nil ; use whatever the underlying face has
	 :bold-weight bold

	 :italic-family nil
	 :italic-slant italic

	 :line-spacing nil)))

;; Set the last preset or fall back to desired style from `fontaine-presets'
;; (the `regular' in this case).
(fontaine-set-preset (or (fontaine-restore-latest-preset) 'regular))

;; Persist the latest font preset when closing/starting Emacs and
;; while switching between themes.
(fontaine-mode 1)

;; fontaine does not define any key bindings.  This is just a sample that
;; respects the key binding conventions.  Evaluate:
;;
;;     (info "(elisp) Key Binding Conventions")
(define-key global-map (kbd "C-c f") #'fontaine-set-preset)

Fontaine is meant to be a collective effort. Every bit of help matters.

Author/maintainer

Protesilaos Stavrou.

Contributions to the code or manual

Christopher League, Eli Zaretskii, Florent Teissier, Terry F. Torrey.

Ideas and user feedback

Adam Porter (alphapapa), Ashlin Eldridge, Joe Higton, Ted Reed.

                GNU Free Documentation License
                 Version 1.3, 3 November 2008


 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
     
 Everyone is permitted to copy and distribute verbatim copies
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