[elpa] externals/fontaine 7896f2cdf5 1/5: Set up fontaine

[ELPA Syncer]

branch: externals/fontaine
commit 7896f2cdf5b2b71c718a580eec44677a0da48234
Author: Protesilaos Stavrou <info@protesilaos.com>
Commit: Protesilaos Stavrou <info@protesilaos.com>

    Set up fontaine
---
 .gitignore      |   5 +
 CHANGELOG.org   |  19 ++
 COPYING         | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.org      | 720 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 doclicense.texi | 505 +++++++++++++++++++++++++++++++++++++++
 fontaine.el     | 480 +++++++++++++++++++++++++++++++++++++
 6 files changed, 2403 insertions(+)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..1736143963
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.elc
+*-autoloads.el
+*-pkg.el
+fontaine.info
+fontaine.texi
diff --git a/CHANGELOG.org b/CHANGELOG.org
new file mode 100644
index 0000000000..12164fde27
--- /dev/null
+++ b/CHANGELOG.org
@@ -0,0 +1,19 @@
+#+TITLE: Change log of fontaine.el
+#+AUTHOR: Protesilaos Stavrou
+#+EMAIL: info@protesilaos.com
+#+OPTIONS: ':nil toc:nil num:nil author:nil email:nil
+
+This document contains the release notes for each tagged commit on the
+project's main git repository: <https://git.sr.ht/~protesilaos/fontaine>.
+
+The newest release is at the top.  For further details, please consult
+the manual: <https://protesilaos.com/emacs/fontaine>.
+
+* Version 0.1.0 on 2022-04-26
+
+Initial release of the package.  Please read the manual.
+
+The core idea for this package was implemented in the =prot-fonts.el=
+file that is part of [[https://gitlab.com/protesilaos/dotfiles][my dotfiles]] 
(now deprecated).  I was using it at
+least since November 2020, though the underlying code was probably
+implemented at an earlier date.
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000000..89d9142746
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) 2021  Protesilaos Stavrou
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) 2021  Protesilaos Stavrou
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.org b/README.org
new file mode 100644
index 0000000000..a54ec929c1
--- /dev/null
+++ b/README.org
@@ -0,0 +1,720 @@
+#+title: fontaine.el: Set font configurations using presets
+#+author: Protesilaos Stavrou
+#+email: info@protesilaos.com
+#+language: en
+#+options: ':t toc:nil author:t email:t num:t
+#+startup: content
+
+#+macro: stable-version 0.1.0
+#+macro: release-date 2022-04-26
+#+macro: development-version 0.2.0-dev
+#+macro: file @@texinfo:@file{@@$1@@texinfo:}@@
+#+macro: space @@texinfo:@: @@
+#+macro: kbd @@texinfo:@kbd{@@$1@@texinfo:}@@
+
+#+export_file_name: fontaine.texi
+
+#+texinfo_filename: fontaine.info
+#+texinfo_dir_category: Emacs misc features
+#+texinfo_dir_title: Fontaine: (fontaine)
+#+texinfo_dir_desc: Set font configurations using presets
+#+texinfo_header: @set MAINTAINERSITE @uref{https://protesilaos.com,maintainer 
webpage}
+#+texinfo_header: @set MAINTAINER Protesilaos Stavrou
+#+texinfo_header: @set MAINTAINEREMAIL @email{info@protesilaos.com}
+#+texinfo_header: @set MAINTAINERCONTACT 
@uref{mailto:info@protesilaos.com,contact the maintainer}
+
+#+texinfo: @insertcopying
+
+This manual, written by Protesilaos Stavrou, describes the customization
+options for =fontaine= (or =fontaine.el=), and provides every other piece of
+information pertinent to it.
+
+The documentation furnished herein corresponds to stable version
+{{{stable-version}}}, released on {{{release-date}}}.  Any reference to
+a newer feature which does not yet form part of the latest tagged
+commit, is explicitly marked as such.
+
+Current development target is {{{development-version}}}.
+
++ Homepage: https://protesilaos.com/emacs/fontaine.
++ Git repository: https://git.sr.ht/~protesilaos/fontaine.
++ Mailing list: https://lists.sr.ht/~protesilaos/fontaine.
+
+#+toc: headlines 8 insert TOC here, with eight headline levels
+
+* COPYING
+:PROPERTIES:
+:COPYING: t
+:CUSTOM_ID: h:40b18bb2-4dc1-4202-bd0b-6fab535b2a0f
+:END:
+
+Copyright (C) 2022  Free Software Foundation, Inc.
+
+#+begin_quote
+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.”
+#+end_quote
+
+* Overview
+:PROPERTIES:
+:CUSTOM_ID: h:62d716b4-44f7-4078-85d2-29a7da8ca253
+:END:
+
+#+vindex: fontaine-presets
+Fontaine lets the user specify presets of font configurations and set
+them on demand.  The user option ~fontaine-presets~ holds all such
+presets.
+
+Presets consist of a list of properties that govern the family, weight,
+and height of the faces ~default~, ~fixed-pitch~, ~variable-pitch~,
+~bold~, and ~italic~.  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):
+
+#+begin_src emacs-lisp
+(regular
+ :default-family "Hack"
+ :default-weight normal
+ :default-height 100
+ :fixed-pitch-family "Fira Code"
+ :fixed-pitch-weight nil ; falls back to :default-weight
+ :fixed-pitch-height 1.0
+ :variable-pitch-family "Noto Sans"
+ :variable-pitch-weight normal
+ :variable-pitch-height 1.0
+ :bold-family nil ; use whatever the underlying face has
+ :bold-weight bold
+ :italic-family "Source Code Pro"
+ :italic-slant italic
+ :line-spacing 1)
+#+end_src
+
+The doc string of ~fontaine-presets~ explains all properties in detail.
+
+#+findex: fontaine-set-preset
+The command ~fontaine-set-preset~ applies the desired preset.  If there
+is only one available, it implements it outright.  Otherwise it produces
+a minibuffer prompt with completion among the available presets.  When
+called from Lisp, the ~fontaine-set-preset~ requires a PRESET argument,
+such as:
+
+#+begin_src emacs-lisp
+(fontaine-set-preset 'regular)
+#+end_src
+
+#+findex: fontaine-set-face-font
+The command ~fontaine-set-face-font~ prompts with completion for a face
+and then asks the user to specify the value of the relevant properties.
+The list of faces to choose from is the same as that implied by the
+~fontaine-presets~.  Properties to change and their respective values
+will depend on the face.  For example, the ~default~ face requires a
+natural number for its height attribute, whereas every other face needs
+a floating point (understood as a multiple of the default height).  This
+command is for interactive use only and is supposed to be used for
+previewing certain styles before eventually codifying them as presets.
+
+Changing the ~bold~ and ~italic~ faces only has a noticeable effect if
+the underlying does not hardcode a weight and slant but inherits from
+those faces instead (e.g. the ~modus-themes~).
+
+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).
+
+* Installation
+:PROPERTIES:
+:CUSTOM_ID: h:031b9bea-d42b-4be0-82c7-42712cde94cc
+:END:
+#+cindex: Installation instructions
+
+** COMMENT GNU ELPA package
+:PROPERTIES:
+:CUSTOM_ID: h:0f288b38-6da1-4628-8f78-4df56cbc8f2a
+:END:
+
+The package is available as =fontaine=.  Simply do:
+
+: M-x package-refresh-contents
+: M-x package-install
+
+And search for it.
+
+** Manual installation
+:PROPERTIES:
+:CUSTOM_ID: h:eba0f790-5261-4966-9c4a-ac6949de7415
+:END:
+
+Assuming your Emacs files are found in =~/.emacs.d/=, execute the
+following commands in a shell prompt:
+
+#+begin_src sh
+cd ~/.emacs.d
+
+# Create a directory for manually-installed packages
+mkdir manual-packages
+
+# Go to the new directory
+cd manual-packages
+
+# Clone this repo, naming it "fontaine"
+git clone https://git.sr.ht/~protesilaos/fontaine fontaine
+#+end_src
+
+Finally, in your =init.el= (or equivalent) evaluate this:
+
+#+begin_src emacs-lisp
+;; Make Elisp files in that directory available to the user.
+(add-to-list 'load-path "~/.emacs.d/manual-packages/fontaine")
+#+end_src
+
+Everything is in place to set up the package.
+
+* Sample configuration
+:PROPERTIES:
+:CUSTOM_ID: h:c4567af0-6d88-4b94-962c-59702191a75d
+:END:
+#+cindex: Package configuration
+
+Remember to read the relevant doc strings.
+
+#+begin_src emacs-lisp
+(require 'fontaine)
+
+(setq fontaine-presets
+      '((regular
+         :default-family "Hack"
+         :default-weight normal
+         :default-height 100
+         :fixed-pitch-family "Fira Code"
+         :fixed-pitch-weight nil ; falls back to :default-weight
+         :fixed-pitch-height 1.0
+         :variable-pitch-family "Noto Sans"
+         :variable-pitch-weight normal
+         :variable-pitch-height 1.0
+         :bold-family nil ; use whatever the underlying face has
+         :bold-weight bold
+         :italic-family "Source Code Pro"
+         :italic-slant italic
+         :line-spacing 1)
+        (large
+         :default-family "Iosevka"
+         :default-weight normal
+         :default-height 150
+         :fixed-pitch-family nil ; falls back to :default-family
+         :fixed-pitch-weight nil ; falls back to :default-weight
+         :fixed-pitch-height 1.0
+         :variable-pitch-family "FiraGO"
+         :variable-pitch-weight normal
+         :variable-pitch-height 1.05
+         :bold-family nil ; use whatever the underlying face has
+         :bold-weight bold
+         :italic-family nil ; use whatever the underlying face has
+         :italic-slant italic
+         :line-spacing 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 p") #'fontaine-set-preset)
+#+end_src
+
+* GNU Free Documentation License
+:PROPERTIES:
+:APPENDIX: t
+:CUSTOM_ID: h:2d84e73e-c143-43b5-b388-a6765da974ea
+:END:
+
+#+texinfo: @include doclicense.texi
+
+#+begin_export html
+<pre>
+
+                GNU Free Documentation License
+                 Version 1.3, 3 November 2008
+
+
+ Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
+     <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+0. PREAMBLE
+
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+
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+
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+The "Title Page" means, for a printed book, the title page itself,
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+the text near the most prominent appearance of the work's title,
+preceding the beginning of the body of the text.
+
+The "publisher" means any person or entity that distributes copies of
+the Document to the public.
+
+A section "Entitled XYZ" means a named subunit of the Document whose
+title either is precisely XYZ or contains XYZ in parentheses following
+text that translates XYZ in another language.  (Here XYZ stands for a
+specific section name mentioned below, such as "Acknowledgements",
+"Dedications", "Endorsements", or "History".)  To "Preserve the Title"
+of such a section when you modify the Document means that it remains a
+section "Entitled XYZ" according to this definition.
+
+The Document may include Warranty Disclaimers next to the notice which
+states that this License applies to the Document.  These Warranty
+Disclaimers are considered to be included by reference in this
+License, but only as regards disclaiming warranties: any other
+implication that these Warranty Disclaimers may have is void and has
+no effect on the meaning of this License.
+
+2. VERBATIM COPYING
+
+You may copy and distribute the Document in any medium, either
+commercially or noncommercially, provided that this License, the
+copyright notices, and the license notice saying this License applies
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+other conditions whatsoever to those of this License.  You may not use
+technical measures to obstruct or control the reading or further
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+compensation in exchange for copies.  If you distribute a large enough
+number of copies you must also follow the conditions in section 3.
+
+You may also lend copies, under the same conditions stated above, and
+you may publicly display copies.
+
+
+3. COPYING IN QUANTITY
+
+If you publish printed copies (or copies in media that commonly have
+printed covers) of the Document, numbering more than 100, and the
+Document's license notice requires Cover Texts, you must enclose the
+copies in covers that carry, clearly and legibly, all these Cover
+Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
+the back cover.  Both covers must also clearly and legibly identify
+you as the publisher of these copies.  The front cover must present
+the full title with all words of the title equally prominent and
+visible.  You may add other material on the covers in addition.
+Copying with changes limited to the covers, as long as they preserve
+the title of the Document and satisfy these conditions, can be treated
+as verbatim copying in other respects.
+
+If the required texts for either cover are too voluminous to fit
+legibly, you should put the first ones listed (as many as fit
+reasonably) on the actual cover, and continue the rest onto adjacent
+pages.
+
+If you publish or distribute Opaque copies of the Document numbering
+more than 100, you must either include a machine-readable Transparent
+copy along with each Opaque copy, or state in or with each Opaque copy
+a computer-network location from which the general network-using
+public has access to download using public-standard network protocols
+a complete Transparent copy of the Document, free of added material.
+If you use the latter option, you must take reasonably prudent steps,
+when you begin distribution of Opaque copies in quantity, to ensure
+that this Transparent copy will remain thus accessible at the stated
+location until at least one year after the last time you distribute an
+Opaque copy (directly or through your agents or retailers) of that
+edition to the public.
+
+It is requested, but not required, that you contact the authors of the
+Document well before redistributing any large number of copies, to
+give them a chance to provide you with an updated version of the
+Document.
+
+
+4. MODIFICATIONS
+
+You may copy and distribute a Modified Version of the Document under
+the conditions of sections 2 and 3 above, provided that you release
+the Modified Version under precisely this License, with the Modified
+Version filling the role of the Document, thus licensing distribution
+and modification of the Modified Version to whoever possesses a copy
+of it.  In addition, you must do these things in the Modified Version:
+
+A. Use in the Title Page (and on the covers, if any) a title distinct
+   from that of the Document, and from those of previous versions
+   (which should, if there were any, be listed in the History section
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+   Document (all of its principal authors, if it has fewer than five),
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+D. Preserve all the copyright notices of the Document.
+E. Add an appropriate copyright notice for your modifications
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+   and required Cover Texts given in the Document's license notice.
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+   to it an item stating at least the title, year, new authors, and
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+appendices that qualify as Secondary Sections and contain no material
+copied from the Document, you may at your option designate some or all
+of these sections as invariant.  To do this, add their titles to the
+list of Invariant Sections in the Modified Version's license notice.
+These titles must be distinct from any other section titles.
+
+You may add a section Entitled "Endorsements", provided it contains
+nothing but endorsements of your Modified Version by various
+parties--for example, statements of peer review or that the text has
+been approved by an organization as the authoritative definition of a
+standard.
+
+You may add a passage of up to five words as a Front-Cover Text, and a
+passage of up to 25 words as a Back-Cover Text, to the end of the list
+of Cover Texts in the Modified Version.  Only one passage of
+Front-Cover Text and one of Back-Cover Text may be added by (or
+through arrangements made by) any one entity.  If the Document already
+includes a cover text for the same cover, previously added by you or
+by arrangement made by the same entity you are acting on behalf of,
+you may not add another; but you may replace the old one, on explicit
+permission from the previous publisher that added the old one.
+
+The author(s) and publisher(s) of the Document do not by this License
+give permission to use their names for publicity for or to assert or
+imply endorsement of any Modified Version.
+
+
+5. COMBINING DOCUMENTS
+
+You may combine the Document with other documents released under this
+License, under the terms defined in section 4 above for modified
+versions, provided that you include in the combination all of the
+Invariant Sections of all of the original documents, unmodified, and
+list them all as Invariant Sections of your combined work in its
+license notice, and that you preserve all their Warranty Disclaimers.
+
+The combined work need only contain one copy of this License, and
+multiple identical Invariant Sections may be replaced with a single
+copy.  If there are multiple Invariant Sections with the same name but
+different contents, make the title of each such section unique by
+adding at the end of it, in parentheses, the name of the original
+author or publisher of that section if known, or else a unique number.
+Make the same adjustment to the section titles in the list of
+Invariant Sections in the license notice of the combined work.
+
+In the combination, you must combine any sections Entitled "History"
+in the various original documents, forming one section Entitled
+"History"; likewise combine any sections Entitled "Acknowledgements",
+and any sections Entitled "Dedications".  You must delete all sections
+Entitled "Endorsements".
+
+
+6. COLLECTIONS OF DOCUMENTS
+
+You may make a collection consisting of the Document and other
+documents released under this License, and replace the individual
+copies of this License in the various documents with a single copy
+that is included in the collection, provided that you follow the rules
+of this License for verbatim copying of each of the documents in all
+other respects.
+
+You may extract a single document from such a collection, and
+distribute it individually under this License, provided you insert a
+copy of this License into the extracted document, and follow this
+License in all other respects regarding verbatim copying of that
+document.
+
+
+7. AGGREGATION WITH INDEPENDENT WORKS
+
+A compilation of the Document or its derivatives with other separate
+and independent documents or works, in or on a volume of a storage or
+distribution medium, is called an "aggregate" if the copyright
+resulting from the compilation is not used to limit the legal rights
+of the compilation's users beyond what the individual works permit.
+When the Document is included in an aggregate, this License does not
+apply to the other works in the aggregate which are not themselves
+derivative works of the Document.
+
+If the Cover Text requirement of section 3 is applicable to these
+copies of the Document, then if the Document is less than one half of
+the entire aggregate, the Document's Cover Texts may be placed on
+covers that bracket the Document within the aggregate, or the
+electronic equivalent of covers if the Document is in electronic form.
+Otherwise they must appear on printed covers that bracket the whole
+aggregate.
+
+
+8. TRANSLATION
+
+Translation is considered a kind of modification, so you may
+distribute translations of the Document under the terms of section 4.
+Replacing Invariant Sections with translations requires special
+permission from their copyright holders, but you may include
+translations of some or all Invariant Sections in addition to the
+original versions of these Invariant Sections.  You may include a
+translation of this License, and all the license notices in the
+Document, and any Warranty Disclaimers, provided that you also include
+the original English version of this License and the original versions
+of those notices and disclaimers.  In case of a disagreement between
+the translation and the original version of this License or a notice
+or disclaimer, the original version will prevail.
+
+If a section in the Document is Entitled "Acknowledgements",
+"Dedications", or "History", the requirement (section 4) to Preserve
+its Title (section 1) will typically require changing the actual
+title.
+
+
+9. TERMINATION
+
+You may not copy, modify, sublicense, or distribute the Document
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense, or distribute it is void, and
+will automatically terminate your rights under this License.
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, receipt of a copy of some or all of the same material does
+not give you any rights to use it.
+
+
+10. FUTURE REVISIONS OF THIS LICENSE
+
+The Free Software Foundation may publish new, revised versions of the
+GNU Free Documentation License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in
+detail to address new problems or concerns.  See
+https://www.gnu.org/licenses/.
+
+Each version of the License is given a distinguishing version number.
+If the Document specifies that a particular numbered version of this
+License "or any later version" applies to it, you have the option of
+following the terms and conditions either of that specified version or
+of any later version that has been published (not as a draft) by the
+Free Software Foundation.  If the Document does not specify a version
+number of this License, you may choose any version ever published (not
+as a draft) by the Free Software Foundation.  If the Document
+specifies that a proxy can decide which future versions of this
+License can be used, that proxy's public statement of acceptance of a
+version permanently authorizes you to choose that version for the
+Document.
+
+11. RELICENSING
+
+"Massive Multiauthor Collaboration Site" (or "MMC Site") means any
+World Wide Web server that publishes copyrightable works and also
+provides prominent facilities for anybody to edit those works.  A
+public wiki that anybody can edit is an example of such a server.  A
+"Massive Multiauthor Collaboration" (or "MMC") contained in the site
+means any set of copyrightable works thus published on the MMC site.
+
+"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
+license published by Creative Commons Corporation, a not-for-profit
+corporation with a principal place of business in San Francisco,
+California, as well as future copyleft versions of that license
+published by that same organization.
+
+"Incorporate" means to publish or republish a Document, in whole or in
+part, as part of another Document.
+
+An MMC is "eligible for relicensing" if it is licensed under this
+License, and if all works that were first published under this License
+somewhere other than this MMC, and subsequently incorporated in whole or
+in part into the MMC, (1) had no cover texts or invariant sections, and
+(2) were thus incorporated prior to November 1, 2008.
+
+The operator of an MMC Site may republish an MMC contained in the site
+under CC-BY-SA on the same site at any time before August 1, 2009,
+provided the MMC is eligible for relicensing.
+
+
+ADDENDUM: How to use this License for your documents
+
+To use this License in a document you have written, include a copy of
+the License in the document and put the following copyright and
+license notices just after the title page:
+
+    Copyright (c)  YEAR  YOUR NAME.
+    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, no Front-Cover Texts, and no Back-Cover Texts.
+    A copy of the license is included in the section entitled "GNU
+    Free Documentation License".
+
+If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
+replace the "with...Texts." line with this:
+
+    with the Invariant Sections being LIST THEIR TITLES, with the
+    Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
+
+If you have Invariant Sections without Cover Texts, or some other
+combination of the three, merge those two alternatives to suit the
+situation.
+
+If your document contains nontrivial examples of program code, we
+recommend releasing these examples in parallel under your choice of
+free software license, such as the GNU General Public License,
+to permit their use in free software.
+</pre>
+#+end_export
+
+#+html: <!--
+
+* Indices
+:PROPERTIES:
+:CUSTOM_ID: h:0325b677-0b1b-426e-a5d5-ddc225fde6fa
+:END:
+
+** Function index
+:PROPERTIES:
+:INDEX: fn
+:CUSTOM_ID: h:40430725-fd7f-47ac-9a29-913942e84a57
+:END:
+
+** Variable index
+:PROPERTIES:
+:INDEX: vr
+:CUSTOM_ID: h:91f3c207-8149-4f9a-89cf-b8726e4e4415
+:END:
+
+** Concept index
+:PROPERTIES:
+:INDEX: cp
+:CUSTOM_ID: h:2b11517a-b67f-494f-b111-1c6195e8a2fc
+:END:
+
+#+html: -->
diff --git a/doclicense.texi b/doclicense.texi
new file mode 100644
index 0000000000..eaf3da0e92
--- /dev/null
+++ b/doclicense.texi
@@ -0,0 +1,505 @@
+@c The GNU Free Documentation License.
+@center Version 1.3, 3 November 2008
+
+@c This file is intended to be included within another document,
+@c hence no sectioning command or @node.
+
+@display
+Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, 
Inc.
+@uref{https://fsf.org/}
+
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+@end display
+
+@enumerate 0
+@item
+PREAMBLE
+
+The purpose of this License is to make a manual, textbook, or other
+functional and useful document @dfn{free} in the sense of freedom: to
+assure everyone the effective freedom to copy and redistribute it,
+with or without modifying it, either commercially or noncommercially.
+Secondarily, this License preserves for the author and publisher a way
+to get credit for their work, while not being considered responsible
+for modifications made by others.
+
+This License is a kind of ``copyleft'', which means that derivative
+works of the document must themselves be free in the same sense.  It
+complements the GNU General Public License, which is a copyleft
+license designed for free software.
+
+We have designed this License in order to use it for manuals for free
+software, because free software needs free documentation: a free
+program should come with manuals providing the same freedoms that the
+software does.  But this License is not limited to software manuals;
+it can be used for any textual work, regardless of subject matter or
+whether it is published as a printed book.  We recommend this License
+principally for works whose purpose is instruction or reference.
+
+@item
+APPLICABILITY AND DEFINITIONS
+
+This License applies to any manual or other work, in any medium, that
+contains a notice placed by the copyright holder saying it can be
+distributed under the terms of this License.  Such a notice grants a
+world-wide, royalty-free license, unlimited in duration, to use that
+work under the conditions stated herein.  The ``Document'', below,
+refers to any such manual or work.  Any member of the public is a
+licensee, and is addressed as ``you''.  You accept the license if you
+copy, modify or distribute the work in a way requiring permission
+under copyright law.
+
+A ``Modified Version'' of the Document means any work containing the
+Document or a portion of it, either copied verbatim, or with
+modifications and/or translated into another language.
+
+A ``Secondary Section'' is a named appendix or a front-matter section
+of the Document that deals exclusively with the relationship of the
+publishers or authors of the Document to the Document's overall
+subject (or to related matters) and contains nothing that could fall
+directly within that overall subject.  (Thus, if the Document is in
+part a textbook of mathematics, a Secondary Section may not explain
+any mathematics.)  The relationship could be a matter of historical
+connection with the subject or with related matters, or of legal,
+commercial, philosophical, ethical or political position regarding
+them.
+
+The ``Invariant Sections'' are certain Secondary Sections whose titles
+are designated, as being those of Invariant Sections, in the notice
+that says that the Document is released under this License.  If a
+section does not fit the above definition of Secondary then it is not
+allowed to be designated as Invariant.  The Document may contain zero
+Invariant Sections.  If the Document does not identify any Invariant
+Sections then there are none.
+
+The ``Cover Texts'' are certain short passages of text that are listed,
+as Front-Cover Texts or Back-Cover Texts, in the notice that says that
+the Document is released under this License.  A Front-Cover Text may
+be at most 5 words, and a Back-Cover Text may be at most 25 words.
+
+A ``Transparent'' copy of the Document means a machine-readable copy,
+represented in a format whose specification is available to the
+general public, that is suitable for revising the document
+straightforwardly with generic text editors or (for images composed of
+pixels) generic paint programs or (for drawings) some widely available
+drawing editor, and that is suitable for input to text formatters or
+for automatic translation to a variety of formats suitable for input
+to text formatters.  A copy made in an otherwise Transparent file
+format whose markup, or absence of markup, has been arranged to thwart
+or discourage subsequent modification by readers is not Transparent.
+An image format is not Transparent if used for any substantial amount
+of text.  A copy that is not ``Transparent'' is called ``Opaque''.
+
+Examples of suitable formats for Transparent copies include plain
+ASCII without markup, Texinfo input format, La@TeX{} input
+format, SGML or XML using a publicly available
+DTD, and standard-conforming simple HTML,
+PostScript or PDF designed for human modification.  Examples
+of transparent image formats include PNG, XCF and
+JPG@.  Opaque formats include proprietary formats that can be
+read and edited only by proprietary word processors, SGML or
+XML for which the DTD and/or processing tools are
+not generally available, and the machine-generated HTML,
+PostScript or PDF produced by some word processors for
+output purposes only.
+
+The ``Title Page'' means, for a printed book, the title page itself,
+plus such following pages as are needed to hold, legibly, the material
+this License requires to appear in the title page.  For works in
+formats which do not have any title page as such, ``Title Page'' means
+the text near the most prominent appearance of the work's title,
+preceding the beginning of the body of the text.
+
+The ``publisher'' means any person or entity that distributes copies
+of the Document to the public.
+
+A section ``Entitled XYZ'' means a named subunit of the Document whose
+title either is precisely XYZ or contains XYZ in parentheses following
+text that translates XYZ in another language.  (Here XYZ stands for a
+specific section name mentioned below, such as ``Acknowledgements'',
+``Dedications'', ``Endorsements'', or ``History''.)  To ``Preserve the Title''
+of such a section when you modify the Document means that it remains a
+section ``Entitled XYZ'' according to this definition.
+
+The Document may include Warranty Disclaimers next to the notice which
+states that this License applies to the Document.  These Warranty
+Disclaimers are considered to be included by reference in this
+License, but only as regards disclaiming warranties: any other
+implication that these Warranty Disclaimers may have is void and has
+no effect on the meaning of this License.
+
+@item
+VERBATIM COPYING
+
+You may copy and distribute the Document in any medium, either
+commercially or noncommercially, provided that this License, the
+copyright notices, and the license notice saying this License applies
+to the Document are reproduced in all copies, and that you add no other
+conditions whatsoever to those of this License.  You may not use
+technical measures to obstruct or control the reading or further
+copying of the copies you make or distribute.  However, you may accept
+compensation in exchange for copies.  If you distribute a large enough
+number of copies you must also follow the conditions in section 3.
+
+You may also lend copies, under the same conditions stated above, and
+you may publicly display copies.
+
+@item
+COPYING IN QUANTITY
+
+If you publish printed copies (or copies in media that commonly have
+printed covers) of the Document, numbering more than 100, and the
+Document's license notice requires Cover Texts, you must enclose the
+copies in covers that carry, clearly and legibly, all these Cover
+Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on
+the back cover.  Both covers must also clearly and legibly identify
+you as the publisher of these copies.  The front cover must present
+the full title with all words of the title equally prominent and
+visible.  You may add other material on the covers in addition.
+Copying with changes limited to the covers, as long as they preserve
+the title of the Document and satisfy these conditions, can be treated
+as verbatim copying in other respects.
+
+If the required texts for either cover are too voluminous to fit
+legibly, you should put the first ones listed (as many as fit
+reasonably) on the actual cover, and continue the rest onto adjacent
+pages.
+
+If you publish or distribute Opaque copies of the Document numbering
+more than 100, you must either include a machine-readable Transparent
+copy along with each Opaque copy, or state in or with each Opaque copy
+a computer-network location from which the general network-using
+public has access to download using public-standard network protocols
+a complete Transparent copy of the Document, free of added material.
+If you use the latter option, you must take reasonably prudent steps,
+when you begin distribution of Opaque copies in quantity, to ensure
+that this Transparent copy will remain thus accessible at the stated
+location until at least one year after the last time you distribute an
+Opaque copy (directly or through your agents or retailers) of that
+edition to the public.
+
+It is requested, but not required, that you contact the authors of the
+Document well before redistributing any large number of copies, to give
+them a chance to provide you with an updated version of the Document.
+
+@item
+MODIFICATIONS
+
+You may copy and distribute a Modified Version of the Document under
+the conditions of sections 2 and 3 above, provided that you release
+the Modified Version under precisely this License, with the Modified
+Version filling the role of the Document, thus licensing distribution
+and modification of the Modified Version to whoever possesses a copy
+of it.  In addition, you must do these things in the Modified Version:
+
+@enumerate A
+@item
+Use in the Title Page (and on the covers, if any) a title distinct
+from that of the Document, and from those of previous versions
+(which should, if there were any, be listed in the History section
+of the Document).  You may use the same title as a previous version
+if the original publisher of that version gives permission.
+
+@item
+List on the Title Page, as authors, one or more persons or entities
+responsible for authorship of the modifications in the Modified
+Version, together with at least five of the principal authors of the
+Document (all of its principal authors, if it has fewer than five),
+unless they release you from this requirement.
+
+@item
+State on the Title page the name of the publisher of the
+Modified Version, as the publisher.
+
+@item
+Preserve all the copyright notices of the Document.
+
+@item
+Add an appropriate copyright notice for your modifications
+adjacent to the other copyright notices.
+
+@item
+Include, immediately after the copyright notices, a license notice
+giving the public permission to use the Modified Version under the
+terms of this License, in the form shown in the Addendum below.
+
+@item
+Preserve in that license notice the full lists of Invariant Sections
+and required Cover Texts given in the Document's license notice.
+
+@item
+Include an unaltered copy of this License.
+
+@item
+Preserve the section Entitled ``History'', Preserve its Title, and add
+to it an item stating at least the title, year, new authors, and
+publisher of the Modified Version as given on the Title Page.  If
+there is no section Entitled ``History'' in the Document, create one
+stating the title, year, authors, and publisher of the Document as
+given on its Title Page, then add an item describing the Modified
+Version as stated in the previous sentence.
+
+@item
+Preserve the network location, if any, given in the Document for
+public access to a Transparent copy of the Document, and likewise
+the network locations given in the Document for previous versions
+it was based on.  These may be placed in the ``History'' section.
+You may omit a network location for a work that was published at
+least four years before the Document itself, or if the original
+publisher of the version it refers to gives permission.
+
+@item
+For any section Entitled ``Acknowledgements'' or ``Dedications'', Preserve
+the Title of the section, and preserve in the section all the
+substance and tone of each of the contributor acknowledgements and/or
+dedications given therein.
+
+@item
+Preserve all the Invariant Sections of the Document,
+unaltered in their text and in their titles.  Section numbers
+or the equivalent are not considered part of the section titles.
+
+@item
+Delete any section Entitled ``Endorsements''.  Such a section
+may not be included in the Modified Version.
+
+@item
+Do not retitle any existing section to be Entitled ``Endorsements'' or
+to conflict in title with any Invariant Section.
+
+@item
+Preserve any Warranty Disclaimers.
+@end enumerate
+
+If the Modified Version includes new front-matter sections or
+appendices that qualify as Secondary Sections and contain no material
+copied from the Document, you may at your option designate some or all
+of these sections as invariant.  To do this, add their titles to the
+list of Invariant Sections in the Modified Version's license notice.
+These titles must be distinct from any other section titles.
+
+You may add a section Entitled ``Endorsements'', provided it contains
+nothing but endorsements of your Modified Version by various
+parties---for example, statements of peer review or that the text has
+been approved by an organization as the authoritative definition of a
+standard.
+
+You may add a passage of up to five words as a Front-Cover Text, and a
+passage of up to 25 words as a Back-Cover Text, to the end of the list
+of Cover Texts in the Modified Version.  Only one passage of
+Front-Cover Text and one of Back-Cover Text may be added by (or
+through arrangements made by) any one entity.  If the Document already
+includes a cover text for the same cover, previously added by you or
+by arrangement made by the same entity you are acting on behalf of,
+you may not add another; but you may replace the old one, on explicit
+permission from the previous publisher that added the old one.
+
+The author(s) and publisher(s) of the Document do not by this License
+give permission to use their names for publicity for or to assert or
+imply endorsement of any Modified Version.
+
+@item
+COMBINING DOCUMENTS
+
+You may combine the Document with other documents released under this
+License, under the terms defined in section 4 above for modified
+versions, provided that you include in the combination all of the
+Invariant Sections of all of the original documents, unmodified, and
+list them all as Invariant Sections of your combined work in its
+license notice, and that you preserve all their Warranty Disclaimers.
+
+The combined work need only contain one copy of this License, and
+multiple identical Invariant Sections may be replaced with a single
+copy.  If there are multiple Invariant Sections with the same name but
+different contents, make the title of each such section unique by
+adding at the end of it, in parentheses, the name of the original
+author or publisher of that section if known, or else a unique number.
+Make the same adjustment to the section titles in the list of
+Invariant Sections in the license notice of the combined work.
+
+In the combination, you must combine any sections Entitled ``History''
+in the various original documents, forming one section Entitled
+``History''; likewise combine any sections Entitled ``Acknowledgements'',
+and any sections Entitled ``Dedications''.  You must delete all
+sections Entitled ``Endorsements.''
+
+@item
+COLLECTIONS OF DOCUMENTS
+
+You may make a collection consisting of the Document and other documents
+released under this License, and replace the individual copies of this
+License in the various documents with a single copy that is included in
+the collection, provided that you follow the rules of this License for
+verbatim copying of each of the documents in all other respects.
+
+You may extract a single document from such a collection, and distribute
+it individually under this License, provided you insert a copy of this
+License into the extracted document, and follow this License in all
+other respects regarding verbatim copying of that document.
+
+@item
+AGGREGATION WITH INDEPENDENT WORKS
+
+A compilation of the Document or its derivatives with other separate
+and independent documents or works, in or on a volume of a storage or
+distribution medium, is called an ``aggregate'' if the copyright
+resulting from the compilation is not used to limit the legal rights
+of the compilation's users beyond what the individual works permit.
+When the Document is included in an aggregate, this License does not
+apply to the other works in the aggregate which are not themselves
+derivative works of the Document.
+
+If the Cover Text requirement of section 3 is applicable to these
+copies of the Document, then if the Document is less than one half of
+the entire aggregate, the Document's Cover Texts may be placed on
+covers that bracket the Document within the aggregate, or the
+electronic equivalent of covers if the Document is in electronic form.
+Otherwise they must appear on printed covers that bracket the whole
+aggregate.
+
+@item
+TRANSLATION
+
+Translation is considered a kind of modification, so you may
+distribute translations of the Document under the terms of section 4.
+Replacing Invariant Sections with translations requires special
+permission from their copyright holders, but you may include
+translations of some or all Invariant Sections in addition to the
+original versions of these Invariant Sections.  You may include a
+translation of this License, and all the license notices in the
+Document, and any Warranty Disclaimers, provided that you also include
+the original English version of this License and the original versions
+of those notices and disclaimers.  In case of a disagreement between
+the translation and the original version of this License or a notice
+or disclaimer, the original version will prevail.
+
+If a section in the Document is Entitled ``Acknowledgements'',
+``Dedications'', or ``History'', the requirement (section 4) to Preserve
+its Title (section 1) will typically require changing the actual
+title.
+
+@item
+TERMINATION
+
+You may not copy, modify, sublicense, or distribute the Document
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense, or distribute it is void, and
+will automatically terminate your rights under this License.
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
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diff --git a/fontaine.el b/fontaine.el
new file mode 100644
index 0000000000..95c4485673
--- /dev/null
+++ b/fontaine.el
@@ -0,0 +1,480 @@
+;;; fontaine.el --- Set font configurations using presets -*- lexical-binding: 
t -*-
+
+;; Copyright (C) 2022  Free Software Foundation, Inc.
+
+;; Author: Protesilaos Stavrou <info@protesilaos.com>
+;; URL: https://git.sr.ht/~protesilaos/fontaine
+;; Mailing list: https://lists.sr.ht/~protesilaos/fontaine
+;; Version: 0.1.0
+;; Package-Requires: ((emacs "27.1"))
+
+;; This file is NOT part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Fontaine lets the user specify presets of font configurations and set
+;; them on demand.  The user option `fontaine-presets' holds all such
+;; presets.
+;;
+;; Presets consist of a list of properties that govern the family, weight,
+;; and height of the faces `default', `fixed-pitch', `variable-pitch',
+;; `bold', and `italic'.  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
+;;      :default-family "Hack"
+;;      :default-weight normal
+;;      :default-height 100
+;;      :fixed-pitch-family "Fira Code"
+;;      :fixed-pitch-weight nil ; falls back to :default-weight
+;;      :fixed-pitch-height 1.0
+;;      :variable-pitch-family "Noto Sans"
+;;      :variable-pitch-weight normal
+;;      :variable-pitch-height 1.0
+;;      :bold-family nil ; use whatever the underlying face has
+;;      :bold-weight bold
+;;      :italic-family "Source Code Pro"
+;;      :italic-slant italic
+;;      :line-spacing 1)
+;;
+;; The doc string of `fontaine-presets' explains all properties in detail.
+;;
+;; The command `fontaine-set-preset' applies the desired preset.  If there
+;; is only one available, it implements it outright.  Otherwise it produces
+;; a minibuffer prompt with completion among the available presets.  When
+;; called from Lisp, the `fontaine-set-preset' requires a PRESET argument,
+;; such as:
+;;
+;;     (fontaine-set-preset 'regular)
+;;
+;; The command `fontaine-set-face-font' prompts with completion for a face
+;; and then asks the user to specify the value of the relevant properties.
+;; The list of faces to choose from is the same as that implied by the
+;; `fontaine-presets'.  Properties to change and their respective values
+;; will depend on the face.  For example, the `default' face requires a
+;; natural number for its height attribute, whereas every other face needs
+;; a floating point (understood as a multiple of the default height).  This
+;; command is for interactive use only and is supposed to be used for
+;; previewing certain styles before eventually codifying them as presets.
+;;
+;; 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).
+
+;;; Code:
+
+(defgroup fontaine ()
+  "Set font configurations using presets."
+  :group 'font)
+
+(defconst fontaine--weights-widget
+  '(choice
+    (const :tag "Normal" normal)
+    (const :tag "Regular (same as normal)" regular)
+    (const :tag "Thin" thin)
+    (const :tag "Ultra-light" ultralight)
+    (const :tag "Extra-light" extralight)
+    (const :tag "Light" light)
+    (const :tag "Semi-light" semilight)
+    (const :tag "Medium" medium)
+    (const :tag "Semi-bold" semibold)
+    (const :tag "Bold" bold)
+    (const :tag "Extra-bold" extrabold)
+    (const :tag "Ultra-bold" ultrabold))
+  "Widget with font weights for `fontaine-presets'.")
+
+(defcustom fontaine-presets
+  '((regular
+     :default-family "Hack"
+     :default-weight normal
+     :default-height 100
+     :fixed-pitch-family "Fira Code"
+     :fixed-pitch-weight nil ; falls back to :default-weight
+     :fixed-pitch-height 1.0
+     :variable-pitch-family "Noto Sans"
+     :variable-pitch-weight normal
+     :variable-pitch-height 1.0
+     :bold-family nil ; use whatever the underlying face has
+     :bold-weight bold
+     :italic-family "Source Code Pro"
+     :italic-slant italic
+     :line-spacing 1)
+    (large
+     :default-family "Iosevka"
+     :default-weight normal
+     :default-height 150
+     :fixed-pitch-family nil ; falls back to :default-family
+     :fixed-pitch-weight nil ; falls back to :default-weight
+     :fixed-pitch-height 1.0
+     :variable-pitch-family "FiraGO"
+     :variable-pitch-weight normal
+     :variable-pitch-height 1.05
+     :bold-family nil ; use whatever the underlying face has
+     :bold-weight bold
+     :italic-family nil ; use whatever the underlying face has
+     :italic-slant italic
+     :line-spacing 1))
+  "Alist of desired typographic properties.
+
+The car of each cell is an arbitrary symbol that identifies
+and/or describes the set of properties (e.g. 'small', 'reading').
+
+The cdr is a plist that specifies the typographic properties of
+the faces `default', `fixed-pitch', `variable-pitch', `bold', and
+`italic'.  It also covers the `line-spacing' variable.
+
+The properties in detail:
+
+- `:default-family' is the family of the `default' face.  If not
+  specified, it falls back to Monospace.
+
+- `:default-weight' is the weight of the `default' face.  The
+  fallback value is `normal'.  Available weights are `normal' or
+  `regular', `thin', `ultralight', `extralight', `light',
+  `semilight', `medium', `semibold', `extrabold', `ultrabold' and
+  must be supported by the underlying typeface.
+
+- `:default-height' is the height of the `default' face.  The
+  fallback value is 100 (the height is 10x the point size).
+
+- `:fixed-pitch-family', `:fixed-pitch-weight',
+  `:fixed-pitch-height' apply to the `fixed-pitch' face.  Their
+  fallback values are `:default-family', `:default-weight', and
+  1.0, respectively.
+
+- The `:variable-pitch-family', `:variable-pitch-weight', and
+  `:variable-pitch-height' apply to the `variable-pitch' face.
+  They all fall back to the respective default values, as
+  described above.
+
+- The `:bold-family' and `:italic-family' are the font families
+  of the `bold' and `italic' faces, respectively.  Only set them
+  if you want to override that of the underlying face.
+
+- The `:bold-weight' specifies the weight of the `bold' face.
+  Its fallback value is bold, meaning the weight, not the face.
+
+- The `:italic-slant' specifies the slant of the `italic' face.
+  Its fallback value is italic, in reference to the slant, not
+  the face.  Acceptable values are `italic', `oblique', `normal',
+  `reverse-italic', `reverse-oblique' and must be supported by
+  the underlying typeface.
+
+- The `:line-spacing' specifies the value of the `line-spacing'
+  variable.
+
+Note that all the properties for `bold' and `italic' will only
+have a noticeable effect if the active theme does not hardcode a
+weight and a slant, but instead inherits the relevant face (such
+as the `modus-themes').
+
+Also note that a height attribute for anything other than the
+`default' face must be set to a floating point, which is
+understood as a multiple of the default height (this allows all
+faces to scale harmoniously).  The `:default-height' always is a
+natural number.
+
+Use the desired preset with the command `fontaine-set-preset'."
+  :group 'fontaine
+  :type `(alist
+          :value-type
+          (plist :options
+                 (((const :tag "Default font family" :default-family) string)
+                  ((const :tag "Default weight" :default-weight) 
,fontaine--weights-widget)
+                  ((const :tag "Default height" :default-height) natnum)
+
+                  ((const :tag "Fixed pitch font family" :fixed-pitch-family) 
string)
+                  ((const :tag "Fixed pitch regular weight" 
:fixed-pitch-weight) ,fontaine--weights-widget)
+                  ((const :tag "Fixed pitch height" :fixed-pitch-height) float)
+
+                  ((const :tag "Variable pitch font family" 
:variable-pitch-family) string)
+                  ((const :tag "Variable pitch regular weight" 
:variable-pitch-weight) ,fontaine--weights-widget)
+                  ((const :tag "Variable pitch height" :variable-pitch-height) 
float)
+
+                  ((const :tag "Font family of the `bold' face" :bold-family) 
string)
+                  ((const :tag "Weight for the `bold' face" :bold-weight) 
,fontaine--weights-widget)
+
+                  ((const :tag "Font family of the `italic' face" 
:italic-family) string)
+                  ((const :tag "Slant for the `italic' face" :italic-slant)
+                   (choice
+                    (const italic)
+                    (const oblique)
+                    (const normal)
+                    (const reverse-italic)
+                    (const reverse-oblique)))
+
+                  ((const :tag "Line spacing" :line-spacing) ,(get 
'line-spacing 'custom-type))))
+          :key-type symbol))
+
+;;;; General utilities
+
+(defun fontaine--set-face-attributes (face family &optional weight height)
+  "Set FACE font to FAMILY, with optional HEIGHT and WEIGHT."
+  (let ((family (or family "Monospace"))
+        (height (or height (if (eq face 'default) 100 1.0)))
+        (weight (or weight 'normal)))
+    ;; ;; Read this: <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45920>
+    ;; ;; Hence why the following fails.  Keeping it for posterity...
+    ;; (set-face-attribute face nil :family family :weight weight :height 
height)
+    (if (eq (face-attribute face :weight) weight)
+          (internal-set-lisp-face-attribute face :family family 0)
+      (internal-set-lisp-face-attribute face :weight weight 0)
+      (internal-set-lisp-face-attribute face :family family 0)
+      (internal-set-lisp-face-attribute face :weight weight 0))
+    (internal-set-lisp-face-attribute face :height height 0)))
+
+(defun fontaine--set-italic-slant (family slant)
+  "Set FAMILY and SLANT of `italic' face."
+  (let ((slant (or slant 'italic))
+        (family (or family 'unspecified)))
+    (if (eq (face-attribute 'italic :slant) slant)
+        (internal-set-lisp-face-attribute 'italic :family family 0)
+      (internal-set-lisp-face-attribute 'italic :slant slant 0)
+      (internal-set-lisp-face-attribute 'italic :family family 0)
+      (internal-set-lisp-face-attribute 'italic :slant slant 0))))
+
+;;;; Apply preset configurations
+
+(defun fontaine--apply-default-preset (preset)
+  "Set `default' face attributes based on PRESET."
+  (if-let ((properties (alist-get preset fontaine-presets)))
+      (progn
+        (fontaine--set-face-attributes
+         'default
+         (plist-get properties :default-family)
+         (plist-get properties :default-weight)
+         (plist-get properties :default-height))
+        (setq-default line-spacing (plist-get properties :line-spacing)))
+    (user-error "%s is not in `fontaine-presets'" preset)))
+
+(defun fontaine--apply-fixed-pitch-preset (preset)
+  "Set `fixed-pitch' face attributes based on PRESET."
+  (if-let ((properties (alist-get preset fontaine-presets)))
+      (fontaine--set-face-attributes
+       'fixed-pitch
+       (or (plist-get properties :fixed-pitch-family) (plist-get properties 
:default-family))
+       (or (plist-get properties :fixed-pitch-weight) (plist-get properties 
:default-weight))
+       (or (plist-get properties :fixed-pitch-height) 1.0))
+    (user-error "%s is not in `fontaine-presets'" preset)))
+
+(defun fontaine--apply-variable-pitch-preset (preset)
+  "Set `variable-pitch' face attributes based on PRESET."
+  (if-let ((properties (alist-get preset fontaine-presets)))
+      (fontaine--set-face-attributes
+       'variable-pitch
+       (or (plist-get properties :variable-pitch-family) (plist-get properties 
:default-family))
+       (or (plist-get properties :variable-pitch-weight) (plist-get properties 
:default-weight))
+       (or (plist-get properties :variable-pitch-height) 1.0))
+    (user-error "%s is not in `fontaine-presets'" preset)))
+
+(defun fontaine--apply-bold-preset (preset)
+  "Set `bold' face attributes based on PRESET."
+  (if-let ((properties (alist-get preset fontaine-presets)))
+      (fontaine--set-face-attributes
+       'bold
+       (or (plist-get properties :bold-family) 'unspecified)
+       (or (plist-get properties :bold-weight) 'bold))
+    (user-error "%s is not in `fontaine-presets'" preset)))
+
+(defun fontaine--apply-italic-preset (preset)
+  "Set `italic' face attributes based on PRESET."
+  (if-let ((properties (alist-get preset fontaine-presets)))
+      (fontaine--set-italic-slant
+       (or (plist-get properties :italic-family) 'unspecified)
+       (or (plist-get properties :italic-slant) 'italic))
+    (user-error "%s is not in `fontaine-presets'" preset)))
+
+(defvar fontaine--font-display-hist '()
+  "History of inputs for display-related font associations.")
+
+(defun fontaine--set-fonts-prompt ()
+  "Prompt for font set (used by `fontaine-set-fonts')."
+  (let* ((def (nth 1 fontaine--font-display-hist))
+         (prompt (if def
+                     (format "Apply font configurations from PRESET [%s]: " 
def)
+                   "Apply font configurations from PRESET: ")))
+    (intern
+     (completing-read
+      prompt
+      fontaine-presets
+      nil t nil 'fontaine--font-display-hist def))))
+
+(defvar fontaine-set-preset-hook nil
+  "Hook that runs after setting fonts.")
+
+(defvar fontaine--current-preset nil
+  "Current font set in `fontaine-presets'.")
+
+;;;###autoload
+(defun fontaine-set-preset (preset)
+  "Set font configurations specified in PRESET.
+PRESET is a symbol that represents the car of a list in
+`fontaine-presets'.  If there is only one available, apply it
+outright, else prompt with completion."
+  (interactive
+   (list
+    (if (= (length fontaine-presets) 1)
+        (caar fontaine-presets)
+      (fontaine--set-fonts-prompt))))
+  (if (not window-system)
+      (user-error "Cannot use this in a terminal emulator; try the Emacs GUI")
+    (fontaine--apply-default-preset preset)
+    (fontaine--apply-fixed-pitch-preset preset)
+    (fontaine--apply-variable-pitch-preset preset)
+    (fontaine--apply-bold-preset preset)
+    (fontaine--apply-italic-preset preset)
+    (setq fontaine--current-preset preset)
+    (run-hooks 'fontaine-set-preset-hook)))
+
+;;;; Modify individual faces
+
+(defconst fontaine--font-faces
+  '(default fixed-pitch variable-pitch bold italic)
+  "List of faces whose typographic attributes we may change.")
+
+(defconst fontaine--font-weights
+  '( normal regular thin ultralight extralight light semilight
+     medium semibold bold extrabold ultrabold)
+  "List of font weights.")
+
+(defconst fontaine--font-slants
+  '( normal oblique italic reverse-oblique reverse-italic)
+  "List of font slants.")
+
+(defvar fontaine--face-history '()
+  "Minibuffer history of `fontaine-set-face-font'.")
+
+(defvar fontaine--font-family-history '()
+  "Minibuffer history of selected font families.")
+
+;; We have `font-family-list', which is unfiltered.
+(defun fontaine--family-list-fixed-pitch (&optional frame)
+  "Return a list of available monospaced font families.
+Target FRAME, if provided as an optional argument."
+  (seq-uniq
+   (seq-map
+    (lambda (fam)
+      (symbol-name (aref fam 0)))
+    (seq-filter
+     (lambda (fam)
+       (aref fam 5))
+     ;; FIXME 2022-04-26: Is `x-family-fonts' the right call here, or
+     ;; will it not work in some Emacs builds?
+     ;;
+     ;; NOTE 2022-04-26: `x-family-fonts' and `x-list-fonts' accept a
+     ;; pattern, but I cannot find how to use it properly to filter out
+     ;; certain families.
+     (x-family-fonts nil frame)))))
+
+(defun fontaine--family-list-variable-pitch (&optional frame)
+  "Return a list of available proportionately spaced font families.
+Target FRAME, if provided as an optional argument."
+  (seq-uniq
+   (seq-map
+    (lambda (fam)
+      (symbol-name (aref fam 0)))
+    (seq-filter
+     (lambda (fam)
+       (null (aref fam 5)))
+     (x-family-fonts nil frame)))))
+
+(defvar fontaine--natnum-history '()
+  "Minibuffer history for natural numbers.")
+
+(defun fontaine--set-default ()
+  "Set `default' attributes interactively."
+  (let ((family (completing-read "Font family of `default' face: "
+                                 (font-family-list) nil t
+                                 nil 'fontaine--font-family-history))
+        (weight (intern (completing-read "Select weight for `default': "
+                                         fontaine--font-weights nil)))
+        (height (read-number "Height of `default' face (must be a natural 
number): "
+                             nil 'fontaine--natnum-history)))
+    (if (natnump height)
+        (fontaine--set-face-attributes 'default family weight)
+      (user-error "Height of `default' face must be a natural number"))))
+
+(defvar fontaine--float-history '()
+  "Minibuffer history for floating point numbers.")
+
+(defun fontaine--set-fixed-pitch ()
+  "Set `fixed-pitch' attributes interactively."
+  (let ((family (completing-read "Font family of `fixed-pitch': "
+                                 (fontaine--family-list-fixed-pitch) nil t
+                                 nil 'fontaine--font-family-history))
+        (weight (intern (completing-read "Select weight for `fixed-pitch': "
+                                         fontaine--font-weights nil)))
+        (height (read-number "Height of `fixed-pitch' face (must be a floating 
point): "
+                             1.0 'fontaine--float-history)))
+    (if (floatp height)
+        (fontaine--set-face-attributes 'fixed-pitch family weight)
+      (user-error "Height of `fixed-pitch' face must be a floating point"))))
+
+(defun fontaine--set-variable-pitch ()
+  "Set `variable-pitch' attributes interactively."
+  (let ((family (completing-read "Font family of `variable-pitch': "
+                                 (fontaine--family-list-variable-pitch) nil t
+                                 nil 'fontaine--font-family-history))
+        (weight (intern (completing-read "Select weight for `variable-pitch': "
+                                         fontaine--font-weights nil)))
+        (height (read-number "Height of `variable-pitch' face (must be a 
floating point): "
+                             1.0 'fontaine--float-history)))
+    (if (floatp height)
+        (fontaine--set-face-attributes 'variable-pitch family weight)
+      (user-error "Height of `variable-pitch' face must be a floating 
point"))))
+
+(defun fontaine--set-bold ()
+  "Set `bold' attributes interactively."
+  (let ((weight (intern (completing-read "Select weight for `bold': "
+                                         fontaine--font-weights nil t))))
+    (fontaine--set-face-attributes 'bold 'unspecified weight)))
+
+(defun fontaine--set-italic ()
+  "Set `italic' attributes interactively."
+  (let ((slant (intern (completing-read "Select slant for `italic': "
+                                        fontaine--font-slants nil t))))
+    (fontaine--set-italic-slant 'unspecified slant)))
+
+;;;###autoload
+(defun fontaine-set-face-font (face)
+  "Set font and other attributes of FACE.
+If FACE is not part of `fontaine--font-faces', fall back to
+calling `fontaine-set-preset'.
+
+Changing the `bold' and `italic' faces only has a noticeable
+effect if the underlying does not hardcode a weight and slant but
+inherits from those faces instead (e.g. the `modus-themes')."
+  (declare (interactive-only t))
+  (interactive
+   (list
+    (intern
+     (completing-read "Which face to change? "
+                      fontaine--font-faces nil t nil
+                      'fontaine--face-history))))
+  (pcase face
+    ('bold (fontaine--set-bold))
+    ('default (fontaine--set-default))
+    ('fixed-pitch (fontaine--set-fixed-pitch))
+    ('italic (fontaine--set-italic))
+    ('variable-pitch (fontaine--set-variable-pitch))
+    (_ (call-interactively #'fontaine-set-preset))))
+
+
+(provide 'fontaine)
+;;; fontaine.el ends here