gnu: Add sbcl-stumpwm-ttf-fonts.

* gnu/packages/wm.scm (sbcl-stumpwm-ttf-fonts): New variable.
* doc/guix-cookbook.texi (Customizing a Window Manager): Document
SBCL-STUMPWM-TTF-FONTS installation and configuration.

doc/guix-cookbook.texi

@@ -11,6 +11,7 @@
 Copyright @copyright{} 2019 Ricardo Wurmus@*
 Copyright @copyright{} 2019 Efraim Flashner@*
 Copyright @copyright{} 2019 Pierre Neidhardt@*
+Copyright @copyright{} 2020 Oleg Pykhalov@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1320,6 +1321,7 @@ reference.
 
 @menu
 * Customizing the Kernel::       Creating and using a custom Linux kernel on Guix System.
+* Customizing a Window Manager:: Handle customization of a Window manager on Guix System.
 @end menu
 
 @node Customizing the Kernel
@@ -1562,6 +1564,56 @@ likely that you'll need to modify the initrd on a machine using a custom
 kernel, since certain modules which are expected to be built may not be
 available for inclusion into the initrd.
 
+@node Customizing a Window Manager
+@section Customizing a Window Manager
+@cindex wm
+
+@node StumpWM
+@subsection StumpWM
+@cindex stumpwm
+
+You could install StumpWM with a Guix system by adding
+@code{stumpwm-checkout} and optionally @code{`(,stumpwm-checkout "lib")}
+packages to a system configuration file, e.g. @file{/etc/config.scm}.
+
+An example configuration can look like this:
+
+@lisp
+(use-modules (gnu))
+(use-package-modules wm)
+
+(operating-system
+  ;; …
+  (packages (append (list sbcl stumpwm-checkout `(,stumpwm-checkout "lib"))
+                    %base-packages)))
+@end lisp
+
+@cindex stumpwm fonts
+By default StumpWM uses X11 fonts, which could be small or pixelated on
+your system.  You could fix this by installing StumpWM contrib Lisp
+module @code{sbcl-stumpwm-ttf-fonts}, adding it to Guix system packages:
+
+@lisp
+(use-modules (gnu))
+(use-package-modules fonts wm)
+
+(operating-system
+  ;; …
+  (packages (append (list sbcl stumpwm-checkout `(,stumpwm-checkout "lib"))
+                    sbcl-stumpwm-ttf-fonts font-dejavu %base-packages)))
+@end lisp
+
+Then you need to add the following code to a StumpWM configuration file
+@file{~/.stumpwm.d/init.lisp}:
+
+@lisp
+(require :ttf-fonts)
+(setf xft:*font-dirs* '("/run/current-system/profile/share/fonts/"))
+(setf clx-truetype:+font-cache-filename+ (concat (getenv "HOME") "/.fonts/font-cache.sexp"))
+(xft:cache-fonts)
+(set-font (make-instance 'xft:font :family "DejaVu Sans Mono" :subfamily "Book" :size 11))
+@end lisp
+
 @c *********************************************************************
 @node Advanced package management
 @chapter Advanced package management

gnu/packages/wm.scm

@@ -14,7 +14,7 @@
 ;;; Copyright © 2016 Ivan Vilata i Balaguer <ivan@selidor.net>
 ;;; Copyright © 2017 Mekeor Melire <mekeor.melire@gmail.com>
 ;;; Copyright © 2017, 2019 Marius Bakke <mbakke@fastmail.com>
-;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
+;;; Copyright © 2017, 2020 Oleg Pykhalov <go.wigust@gmail.com>
 ;;; Copyright © 2018, 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Pierre-Antoine Rouby <contact@parouby.fr>
 ;;; Copyright © 2018, 2019 Meiyo Peng <meiyo@riseup.net>
@@ -1661,6 +1661,37 @@ (define-public stumpwm+slynk
 (define-public sbcl-stumpwm+slynk
   (deprecated-package "sbcl-stumpwm-with-slynk" stumpwm+slynk))
 
+(define-public sbcl-stumpwm-ttf-fonts
+  (let ((commit "dd5b037923ec7d3cc27c55806bcec5a1b8cf4e91")
+        (revision "1"))
+    (package
+      (name "sbcl-ttf-fonts")
+      (version (git-version "0.0.1" revision commit)) ;no upstream release
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/stumpwm/stumpwm-contrib.git")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0ahxdj9f884afpzxczx6mx7l4nwg4kw6afqaq7lwhf7lxcwylldn"))))
+      (inputs
+       `(("stumpwm" ,stumpwm "lib")
+         ("clx-truetype" ,sbcl-clx-truetype)))
+      (build-system asdf-build-system/sbcl)
+      (arguments
+       '(#:phases
+         (modify-phases %standard-phases
+           (add-after 'unpack 'chdir
+             (lambda _
+               (chdir "util/ttf-fonts"))))))
+      (home-page "https://github.com/stumpwm/stumpwm-contrib")
+      (synopsis "Implementation of TTF font rendering for Lisp")
+      (description "This package provides a Lisp implementation of TTF font
+rendering.")
+      (license (list license:gpl2+ license:gpl3+ license:bsd-2)))))
+
 (define-public lemonbar
   (let ((commit "35183ab81d2128dbb7b6d8e119cc57846bcefdb4")
         (revision "1"))