gnu: Add pikchr.

* gnu/packages/pikchr.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/local.mk

@@ -474,6 +474,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/phabricator.scm 			\
   %D%/packages/php.scm				\
   %D%/packages/piet.scm			\
+  %D%/packages/pikchr.scm			\
   %D%/packages/pkg-config.scm			\
   %D%/packages/plan9.scm			\
   %D%/packages/plotutils.scm			\

gnu/packages/pikchr.scm

@@ -0,0 +1,59 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 pukkamustard <pukkamustard@posteo.net>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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.
+;;;
+;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages pikchr)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix download)
+  #:use-module ((guix licenses) #:prefix license:))
+
+(define-public pikchr
+  (let ((commit "221988914eff6efe")
+        (revision "0"))                       ;increment for each new snapshot
+    (package
+      (name "pikchr")
+      ;; To update, use the last check-in in https://pikchr.org/home/timeline?r=trunk
+      (version (string-append revision "-" (string-take commit 5)))
+      (source (origin
+                (method url-fetch)
+                (uri (string-append "https://pikchr.org/home/tarball/" commit
+                                    "/pikchr.tar.gz"))
+                (file-name (string-append "pikchr-" version ".tar.gz"))
+                (sha256
+                 (base32
+                  "0yclkincsgfni4scjzp5avdsij8vmyxjn0q2qkwjhn3p43y8nxzd"))))
+      (build-system gnu-build-system)
+      (arguments
+       '(#:tests? #f                              ;no tests
+         #:phases
+         (modify-phases %standard-phases
+           (delete 'bootstrap)
+           (delete 'configure)
+           (replace 'install
+             (lambda* (#:key outputs #:allow-other-keys)
+               (let* ((out (assoc-ref outputs "out"))
+                      (bin (string-append out "/bin")))
+                 (install-file "pikchr" bin)))))))
+      (home-page "https://pikchr.org")
+      (synopsis "Markup language for diagrams in technical documentation")
+      (description
+       "Pikchr (pronounced @emph{picture}) is a PIC-like markup language for
+diagrams in technical documentation.  Pikchr is designed to be embedded in
+fenced code blocks of Markdown or similar mechanisms of other documentation
+markup languages.")
+      (license license:bsd-0))))