[bug#48952] [PATCH 0/3] build-system: Add godot-build-system.

[bug#48952] [PATCH 0/3] build-system: Add godot-build-system.

[Vinicius Monego]

This patchset adds a build system for Godot games. There is some TODO for the future:

_ I had to add a #:game keyword because it is difficult to parse the name of games in the source files. I'd like to remove it when possible.
_ I expect that most projects will begin to ship export_presets.cfg and desktop files in the future. Librerama is the only project that I found shipping both and the desktop file is in export/freedesktop. I don't know if that location is autogenerated or not. In any case, I left the desktop files out of the build system for now.
_ Support unit tests for games. I don't know how it works in Godot, and very few games have them at the moment.

I also tested the build system with Tux Builder (reimplementation of SuperTux in Godot) and Circle Jump and both are working.

Side note: Godot 3.3.2-stable is fully compatible with 3.2.* (it was supposed to be 3.2.4 but the versioning change) and a recomended upgrade in case anyone wants to upgrade it.

Vinicius Monego (3):
  build-system: Add godot-build-system.
  gnu: superstarfighter: Use godot-build-system.
  gnu: Add librerama.

 Makefile.am                       |   3 +
 doc/guix.texi                     |  19 ++++
 gnu/packages/games.scm            | 100 ++++++++++-----------
 guix/build-system/godot.scm       | 142 ++++++++++++++++++++++++++++++
 guix/build/godot-build-system.scm | 113 ++++++++++++++++++++++++
 5 files changed, 330 insertions(+), 49 deletions(-)
 create mode 100644 guix/build-system/godot.scm
 create mode 100644 guix/build/godot-build-system.scm

-- 
2.32.0

[bug#48952] [PATCH 1/3] build-system: Add godot-build-system.

[Vinicius Monego]

* guix/build/godot-build-system.scm: New file.
* guix/build-system/godot.scm: New file.
* Makefile.am (MODULES): Add them here.
* doc/guix.texi (Build Systems): Document godot-build-system.
---
 Makefile.am                       |   3 +
 doc/guix.texi                     |  19 ++++
 guix/build-system/godot.scm       | 142 ++++++++++++++++++++++++++++++
 guix/build/godot-build-system.scm | 113 ++++++++++++++++++++++++
 4 files changed, 277 insertions(+)
 create mode 100644 guix/build-system/godot.scm
 create mode 100644 guix/build/godot-build-system.scm

diff --git a/Makefile.am b/Makefile.am
index aa21b5383b..2fbf1d1a13 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,6 +15,7 @@
 # Copyright © 2018 Alex Vong <alexvong1995@gmail.com>
 # Copyright © 2019 Efraim Flashner <efraim@flashner.co.il>
 # Copyright © 2021 Chris Marusich <cmmarusich@gmail.com>
+# Copyright © 2021 Vinicius Monego <monego@posteo.net>
 #
 # This file is part of GNU Guix.
 #
@@ -145,6 +146,7 @@ MODULES =					\
   guix/build-system/copy.scm			\
   guix/build-system/glib-or-gtk.scm		\
   guix/build-system/gnu.scm			\
+  guix/build-system/godot.scm			\
   guix/build-system/guile.scm			\
   guix/build-system/haskell.scm			\
   guix/build-system/julia.scm			\
@@ -201,6 +203,7 @@ MODULES =					\
   guix/build/gnu-bootstrap.scm			\
   guix/build/gnu-build-system.scm		\
   guix/build/gnu-dist.scm			\
+  guix/build/godot-build-system.scm		\
   guix/build/guile-build-system.scm		\
   guix/build/maven-build-system.scm		\
   guix/build/node-build-system.scm		\
diff --git a/doc/guix.texi b/doc/guix.texi
index 59b4ac11b4..430724be0a 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -90,6 +90,7 @@ Copyright @copyright{} 2020 Edgar Vincent@*
 Copyright @copyright{} 2021 Maxime Devos@*
 Copyright @copyright{} 2021 B. Wilson@*
 Copyright @copyright{} 2021 Xinglu Chen@*
+Copyright @copyright{} 2021 Vinicius Monego@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -7751,6 +7752,24 @@ specified with the @code{#:glib} parameter.
 Both phases are executed after the @code{install} phase.
 @end defvr
 
+@defvr {Scheme Variable} godot-build-system
+This variable is exported by @code{(guix build-system godot)}.  It implements
+the more or less standard build procedure used by Godot games.
+
+Projects may place @file{project.godot} in a subdirectory.  This can be passed
+to @code{#:project-directory}.  It defaults to the source root.
+
+Many projects do not ship with @file{exports_preset.cfg}.  In that case, a
+custom template is created.  If that file exists already, it is preferred.
+The name of the target preset is variable and can be specified with
+@code{#:export-name}.  Defaults to ``Guix'' which is used in the custom
+template.
+
+It further creates a wrapper script in @code{bin/} which can be used to launch
+the game.  The filename is configured by @code{#:game} and should be set to
+the name of the package.  Desktop files must be created or copied manually.
+@end defvr
+
 @defvr {Scheme Variable} guile-build-system
 This build system is for Guile packages that consist exclusively of Scheme
 code and that are so lean that they don't even have a makefile, let alone a
diff --git a/guix/build-system/godot.scm b/guix/build-system/godot.scm
new file mode 100644
index 0000000000..3362e71fbc
--- /dev/null
+++ b/guix/build-system/godot.scm
@@ -0,0 +1,142 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Vinicius Monego <monego@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 (guix build-system godot)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix memoization)
+  #:use-module (guix packages)
+  #:use-module (guix derivations)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%godot-build-system-modules
+            default-godot
+            godot-build
+            godot-build-system))
+
+(define (default-godot)
+  "Return the default Godot package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((module (resolve-interface '(gnu packages game-development))))
+    (module-ref module 'godot)))
+
+(define %godot-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build godot-build-system)
+    ,@%gnu-build-system-modules))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (godot (default-godot))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:source #:inputs #:native-inputs #:target))
+
+  (and (not target)                               ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ("godot" ,godot)
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("godot-headless" ,godot "headless")
+                         ,@native-inputs))
+         (outputs outputs)
+         (build godot-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (godot-build store name inputs
+                       #:key
+                       (phases '(@ (guix build godot-build-system)
+                                   %standard-phases))
+                       (configure-flags ''())
+                       (outputs '("out"))
+                       (output "out")
+
+                       ;; Name of the wrapper script and pck file.
+                       ;; Usually the same name of the package.
+                       (game "game")
+
+                       ;; Directory where project.godot is located.
+                       (project-directory ".")
+
+                       ;; Name for the export target.
+                       (export-name "Guix")
+                       
+                       (search-paths '())
+                       (system (%current-system))
+                       (guile #f)
+                       (imported-modules %godot-build-system-modules)
+                       (modules '((guix build godot-build-system)
+                                  (guix build utils))))
+  "Build SOURCE using GODOT, and with INPUTS."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (godot-build #:name ,name
+                    #:source ,(match (assoc-ref inputs "source")
+                                (((? derivation? source))
+                                 (derivation->output-path source))
+                                ((source)
+                                 source)
+                                (source
+                                 source))
+                    #:configure-flags ,configure-flags
+                    #:system ,system
+                    #:phases ,phases
+                    #:game ,game
+                    #:project-directory ,project-directory
+                    #:export-name ,export-name
+                    #:outputs %outputs
+                    #:output ,output
+                    #:search-paths ',(map search-path-specification->sexp
+                                          search-paths)
+                    #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system #:graft? #f))
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages commencement)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system #:graft? #f)))))
+
+  (build-expression->derivation store name builder
+                                #:inputs inputs
+                                #:system system
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define godot-build-system
+  (build-system
+    (name 'godot)
+    (description "The Godot build system")
+    (lower lower)))
diff --git a/guix/build/godot-build-system.scm b/guix/build/godot-build-system.scm
new file mode 100644
index 0000000000..e72ae9db14
--- /dev/null
+++ b/guix/build/godot-build-system.scm
@@ -0,0 +1,113 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Vinicius Monego <monego@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 (guix build godot-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 ftw)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            godot-build))
+
+(define* (configure #:key project-directory #:allow-other-keys)
+
+  ;; Projects may have the 'project.godot' file in different directories.  The
+  ;; project-directory key contains the path string to the directory where it
+  ;; is located.
+  
+  (chdir project-directory)
+  (setenv "HOME" (getcwd))
+  
+  ;; Not all projects ship with export_presets.cfg because it may contain
+  ;; confidential information such as CI keys.  In that case, we check if
+  ;; this file exists, and if it doesn't we use this generic template below.
+  ;; There is ongoing effort to separate the keys from that file. See:
+  ;; https://github.com/godotengine/godot-demo-projects/issues/329 and
+  ;; https://github.com/godotengine/godot/pull/35930.  Until that is fixed and
+  ;; developers start to provide the file, we have to use our own template.
+
+  (let ((export-presets "export_presets.cfg"))
+    (when (not (file-exists? export-presets))
+      (with-output-to-file export-presets
+        (lambda ()
+          (display
+           "[preset.0]
+
+name=\"Guix\"
+platform=\"Linux/X11\"
+runnable=true
+custom_features=\"\"
+export_filter=\"all_resources\"
+include_filter=\"\"
+exclude_filter=\"\"
+export_path=\"\"
+patch_list=PoolStringArray(  )
+script_export_mode=1
+script_encryption_key=\"\"
+
+[preset.0.options]
+
+texture_format/bptc=false
+texture_format/s3tc=true
+texture_format/etc=false
+texture_format/etc2=false
+texture_format/no_bptc_fallbacks=true
+binary_format/64_bits=false
+binary_format/embed_pck=false
+custom_template/release=\"\"
+custom_template/debug=\"\""))))))
+
+(define* (build #:key inputs game export-name #:allow-other-keys)
+  (let ((godot (assoc-ref inputs "godot-headless")))
+    (invoke (string-append godot "/bin/godot_server")
+            "--export-pack" export-name (string-append game ".pck")
+            "project.godot")))
+
+(define* (install #:key inputs outputs game #:allow-other-keys)
+  (let* ((out (assoc-ref outputs "out"))
+         (bin (string-append out "/bin"))
+         (share (string-append out "/share"))
+         (data (string-append share "/" game))
+         (icons (string-append share "/icons/hicolor/256x256/apps")))
+    (install-file (string-append game ".pck") data)
+    (mkdir-p bin)
+    (call-with-output-file (string-append bin "/" game)
+      (lambda (port)
+        (format port
+                "#!/bin/sh~@
+                 exec ~a/bin/godot --main-pack ~a/~a.pck~%"
+                (assoc-ref inputs "godot") data game)
+        (chmod port #o755)))
+    (mkdir-p icons)
+    (copy-file "icon.png" (string-append icons "/" game ".png"))))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (delete 'bootstrap)
+    (replace 'configure configure)
+    (replace 'build build)
+    (delete 'check)
+    (replace 'install install)))
+
+(define* (godot-build #:key inputs (phases %standard-phases)
+                       #:allow-other-keys #:rest args)
+  "Build the given Godot package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
-- 
2.32.0

[bug#48952] [PATCH 2/3] gnu: superstarfighter: Use godot-build-system.

[Vinicius Monego]

* gnu/packages/games.scm (superstarfighter)[build-system]: Use
godot-build-system.
[arguments]: Remove #:tests?. <#:game, #:project-directory>: New fields.
<#:phases>: Do not replace configure, build and install. Add phase
'install-desktop-file after 'install.
---
 gnu/packages/games.scm | 61 +++++++++---------------------------------
 1 file changed, 12 insertions(+), 49 deletions(-)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 2eaea5868e..55f468da2c 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -62,6 +62,7 @@
 ;;; Copyright © 2021 David Pflug <david@pflug.io>
 ;;; Copyright © 2021 Felix Gruber <felgru@posteo.net>
 ;;; Copyright © 2021 Solene Rapenne <solene@perso.pw>
+;;; Copyright © 2021 Vinicius Monego <monego@posteo.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -199,6 +200,7 @@
   #:use-module (guix build-system glib-or-gtk)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system go)
+  #:use-module (guix build-system godot)
   #:use-module (guix build-system meson)
   #:use-module (guix build-system perl)
   #:use-module (guix build-system python)
@@ -2464,62 +2466,23 @@ modify quests for the Solarus engine.")))
        (file-name (git-file-name name version))
        (sha256
         (base32 "1fly63yf5ls1xwm15if4lxwy67wi84k4gvjllljpykrl18vw2y0y"))))
-    (build-system gnu-build-system)
+    (build-system godot-build-system)
     (arguments
-     `(#:tests? #f                      ;there are no tests
+     `(#:game ,name
+       #:project-directory "godot"
        #:phases
        (modify-phases %standard-phases
-         (replace 'configure
-           (lambda _
-             (chdir "godot")
-             (setenv "HOME" (getcwd))
-             (with-output-to-file "export_presets.cfg"
-               (lambda ()
-                 (display
-                  "[preset.0]
-name=\"Guix\"
-platform=\"Linux/X11\"
-runnable=true
-[preset.0.options]")))
-             #t))
-         (replace 'build
-           (lambda _
-             (let ((godot (assoc-ref %build-inputs "godot-headless")))
-               (invoke (string-append godot "/bin/godot_server")
-                       "--export-pack" "Guix"
-                       "superstarfighter.pck" "project.godot"))
-             #t))
-         (replace 'install
-           (lambda* (#:key inputs outputs #:allow-other-keys)
+         (add-after 'install 'install-desktop-file
+           (lambda* (#:key inputs outputs game #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))
-                    (bin (string-append out "/bin"))
-                    (share (string-append out "/share"))
-                    (data (string-append share "/superstarfighter"))
-                    (icons (string-append share "/icons/hicolor/256x256/apps")))
-               (install-file "superstarfighter.pck" data)
-               (mkdir-p bin)
-               (call-with-output-file (string-append bin "/superstarfighter")
-                 (lambda (port)
-                   (format port
-                           "#!/bin/sh~@
-                            exec ~a/bin/godot --main-pack ~a/superstarfighter.pck~%"
-                           (assoc-ref inputs "godot")
-                           data)
-                   (chmod port #o755)))
-               (mkdir-p icons)
-               (copy-file "icon.png" (string-append icons "/" ,name ".png"))
+                    (share (string-append out "/share")))
                (make-desktop-entry-file
-                (string-append share "/applications/" ,name ".desktop")
+                (string-append share "/applications/" game ".desktop")
                 #:name "SuperStarfighter"
                 #:comment "Fast-paced arcade combat game"
-                #:exec ,name
-                #:icon ,name
-                #:categories '("Game" "ArcadeGame")))
-             #t)))))
-    (native-inputs
-     `(("godot-headless" ,godot "headless")))
-    (inputs
-     `(("godot" ,godot)))
+                #:exec game
+                #:icon game
+                #:categories '("Game" "ArcadeGame"))))))))
     (home-page "https://notapixel.itch.io/superstarfighter")
     (synopsis "Fast-paced local multiplayer arcade game")
     (description "In SuperStarfighter, up to four local players compete in a
-- 
2.32.0

[bug#48952] [PATCH 3/3] gnu: Add librerama.

[Vinicius Monego]

* gnu/packages/games.scm (librerama): New variable.
---
 gnu/packages/games.scm | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 55f468da2c..40ae8de80c 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -2491,6 +2491,45 @@ available, as well as a single-player mode with AI-controlled ships.")
     (license (list license:expat         ; game
                    license:silofl1.1)))) ; fonts
 
+(define-public librerama
+  (package
+    (name "librerama")
+    (version "0.4.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://codeberg.org/Yeldham/librerama")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "16hx09vbdsh27vwkgfmbhl1s5zkkmnyrirryz420kzlvmf5igsvy"))))
+    (build-system godot-build-system)
+    (arguments
+     `(#:game ,name
+       #:export-name "GNU/Linux / *BSD - 32 Bits"
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'install 'install-desktop-file
+           (lambda* (#:key inputs outputs game #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (share (string-append out "/share"))
+                    (applications (string-append share "/applications")))
+               (mkdir-p applications)
+               (with-directory-excursion "export/freedesktop"
+                 (copy-file "io.yeldham.librerama.desktop"
+                            (string-append applications "/" game
+                                           ".desktop")))))))))
+    (home-page "https://yeldham.itch.io/librerama")
+    (synopsis "Fast-paced arcade collection of mini-games")
+    (description
+     "Librerama is an arcade compilation of small, fast-paced games, with the
+overall objective being to play a series of mini-games (here referred as
+\"nanogames\") which progressively increase in speed and difficulty.")
+    (license (list license:gpl3+         ; game
+                   license:cc-by-sa4.0   ; assets
+                   license:silofl1.1)))) ; fonts
+
 (define %ufoai-commit "a542a87a891f96b1ab2c44d35b2f6f16859a5019")
 (define %ufoai-revision "0")
 (define %ufoai-version (git-version "2.6.0_dev" %ufoai-revision %ufoai-commit))
-- 
2.32.0

[bug#48952] [PATCH v2 0/6] Add godot-build-system (v2).

[Vinicius Monego]

This is my second attempt. Updated to the new standards with some small changes and other proof of concept packages.

Vinicius Monego (6):
  build-system: Add godot-build-system.
  gnu: superstarfighter: Use godot-build-system.
  gnu: Add librerama.
  gnu: Add material-maker.
  gnu: Add pixelorama.
  gnu: Add lorien.

 Makefile.am                       |   3 +
 doc/guix.texi                     |  19 +++++
 gnu/packages/game-development.scm |  47 ++++++++++++
 gnu/packages/games.scm            |  81 +++++++++-----------
 gnu/packages/graphics.scm         |  30 ++++++++
 guix/build-system/godot.scm       | 122 +++++++++++++++++++++++++++++
 guix/build/godot-build-system.scm | 123 ++++++++++++++++++++++++++++++
 7 files changed, 382 insertions(+), 43 deletions(-)
 create mode 100644 guix/build-system/godot.scm
 create mode 100644 guix/build/godot-build-system.scm


base-commit: 8f85e4f9aa0bd53d0240ea28e280551c8a066b85
-- 
2.30.2

[bug#48952] [PATCH v2 1/6] build-system: Add godot-build-system.

[Vinicius Monego]

* guix/build/godot-build-system.scm: New file.
* guix/build-system/godot.scm: New file.
* Makefile.am (MODULES): Add them here.
* doc/guix.texi (Build Systems): Document godot-build-system.
---
 Makefile.am                       |   3 +
 doc/guix.texi                     |  19 +++++
 guix/build-system/godot.scm       | 122 +++++++++++++++++++++++++++++
 guix/build/godot-build-system.scm | 123 ++++++++++++++++++++++++++++++
 4 files changed, 267 insertions(+)
 create mode 100644 guix/build-system/godot.scm
 create mode 100644 guix/build/godot-build-system.scm

diff --git a/Makefile.am b/Makefile.am
index c4ccee65f1..283e2d7b7f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,6 +16,7 @@
 # Copyright © 2019 Efraim Flashner <efraim@flashner.co.il>
 # Copyright © 2021 Chris Marusich <cmmarusich@gmail.com>
 # Copyright © 2021 Andrew Tropin <andrew@trop.in>
+# Copyright © 2021 Vinicius Monego <monego@posteo.net>
 #
 # This file is part of GNU Guix.
 #
@@ -148,6 +149,7 @@ MODULES =					\
   guix/build-system/copy.scm			\
   guix/build-system/glib-or-gtk.scm		\
   guix/build-system/gnu.scm			\
+  guix/build-system/godot.scm			\
   guix/build-system/guile.scm			\
   guix/build-system/haskell.scm			\
   guix/build-system/julia.scm			\
@@ -204,6 +206,7 @@ MODULES =					\
   guix/build/gnu-bootstrap.scm			\
   guix/build/gnu-build-system.scm		\
   guix/build/gnu-dist.scm			\
+  guix/build/godot-build-system.scm		\
   guix/build/guile-build-system.scm		\
   guix/build/maven-build-system.scm		\
   guix/build/minetest-build-system.scm		\
diff --git a/doc/guix.texi b/doc/guix.texi
index 34e75156eb..d1b5a365ea 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -100,6 +100,7 @@ Copyright @copyright{} 2021 Josselin Poiret@*
 Copyright @copyright{} 2021 Andrew Tropin@*
 Copyright @copyright{} 2021 Sarah Morgensen@*
 Copyright @copyright{} 2021 Josselin Poiret@*
+Copyright @copyright{} 2021 Vinicius Monego@*
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -8324,6 +8325,24 @@ specified with the @code{#:glib} parameter.
 Both phases are executed after the @code{install} phase.
 @end defvr
 
+@defvr {Scheme Variable} godot-build-system
+This variable is exported by @code{(guix build-system godot)}.  It implements
+the more or less standard build procedure used by Godot games.
+
+Projects may place @file{project.godot} in a subdirectory.  This can be passed
+to @code{#:project-directory}.  It defaults to the source root.
+
+Many projects do not ship with @file{exports_preset.cfg}.  In that case, a
+custom template is created.  If that file exists already, it is preferred.
+The name of the target preset is variable and can be specified with
+@code{#:export-name}.  Defaults to ``Linux/X11'' which is used in the custom
+template.
+
+It further creates a wrapper script in @code{bin/} which can be used to launch
+the game.  The filename is configured by @code{#:game} and should be set to
+the name of the package.  Desktop files must be created or copied manually.
+@end defvr
+
 @defvr {Scheme Variable} guile-build-system
 This build system is for Guile packages that consist exclusively of Scheme
 code and that are so lean that they don't even have a makefile, let alone a
diff --git a/guix/build-system/godot.scm b/guix/build-system/godot.scm
new file mode 100644
index 0000000000..510d33c86e
--- /dev/null
+++ b/guix/build-system/godot.scm
@@ -0,0 +1,122 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Vinicius Monego <monego@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 (guix build-system godot)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix memoization)
+  #:use-module (guix packages)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%godot-build-system-modules
+            default-godot
+            godot-build
+            godot-build-system))
+
+(define (default-godot)
+  "Return the default Godot package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((module (resolve-interface '(gnu packages game-development))))
+    (module-ref module 'godot)))
+
+(define %godot-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build godot-build-system)
+    ,@%gnu-build-system-modules))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (godot (default-godot))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:target #:godot #:inputs #:native-inputs))
+
+  (and (not target)                               ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source)
+                                ("godot-headless" ,godot "headless"))
+                              '())
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("godot" ,godot)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build godot-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (godot-build name inputs
+                      #:key
+                      source
+                      (phases '%standard-phases)
+                      (configure-flags ''())
+                      (game "Game")
+                      (project-directory ".")
+                      (export-name "Linux/X11")
+                      (outputs '("out"))
+                      (output "out")
+                      (search-paths '())
+                      (system (%current-system))
+                      (guile #f)
+                      (imported-modules %godot-build-system-modules)
+                      (modules '((guix build godot-build-system)
+                                 (guix build utils))))
+  "Build SOURCE using GODOT, and with INPUTS."
+  (define builder
+    (with-imported-modules imported-modules
+      #~(begin
+          (use-modules #$@(sexp->gexp modules))
+          (godot-build #:name #$name
+                       #:source #+source
+                       #:configure-flags #$configure-flags
+                       #:game #$game
+                       #:project-directory #$project-directory
+                       #:export-name #$export-name
+                       #:system #$system
+                       #:phases #$phases
+                       #:outputs #$(outputs->gexp outputs)
+                       #:output #$output
+                       #:game #$game
+                       #:search-paths '#$(sexp->gexp
+                                          (map search-path-specification->sexp
+                                               search-paths))
+                       #:inputs #$(input-tuples->gexp inputs)))))
+
+  (mlet %store-monad ((guile (package->derivation (or guile (default-guile))
+                                                  system #:graft? #f)))
+    (gexp->derivation name builder
+                      #:system system
+                      #:guile-for-build guile)))
+
+(define godot-build-system
+  (build-system
+    (name 'godot)
+    (description "The Godot build system")
+    (lower lower)))
diff --git a/guix/build/godot-build-system.scm b/guix/build/godot-build-system.scm
new file mode 100644
index 0000000000..5c25111540
--- /dev/null
+++ b/guix/build/godot-build-system.scm
@@ -0,0 +1,123 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Vinicius Monego <monego@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 (guix build godot-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 ftw)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            godot-build))
+
+(define* (configure #:key project-directory #:allow-other-keys)
+
+  ;; Projects may have the 'project.godot' file in different directories.  The
+  ;; project-directory key contains the path string to the directory where it
+  ;; is located.
+
+  (chdir project-directory)
+  (setenv "HOME" (getcwd))
+
+  ;; Not all projects ship with export_presets.cfg because it may contain
+  ;; confidential information such as CI keys.  In that case, we check if
+  ;; this file exists, and if it doesn't we use this generic template below.
+  ;; There is ongoing effort to separate the keys from that file.  See:
+  ;; https://github.com/godotengine/godot-demo-projects/issues/329 and
+  ;; https://github.com/godotengine/godot/pull/35930.  Until that is fixed and
+  ;; developers start to provide the file, we have to use our own template.
+
+  (let ((export-presets "export_presets.cfg"))
+    (when (not (file-exists? export-presets))
+      (with-output-to-file export-presets
+        (lambda ()
+          (display
+           "[preset.0]
+
+name=\"Linux/X11\"
+platform=\"Linux/X11\"
+runnable=true
+custom_features=\"\"
+export_filter=\"all_resources\"
+include_filter=\"\"
+exclude_filter=\"\"
+export_path=\"\"
+patch_list=PoolStringArray(  )
+script_export_mode=1
+script_encryption_key=\"\"
+
+[preset.0.options]
+
+texture_format/bptc=false
+texture_format/s3tc=true
+texture_format/etc=false
+texture_format/etc2=false
+texture_format/no_bptc_fallbacks=true
+binary_format/64_bits=false
+binary_format/embed_pck=false
+custom_template/release=\"\"
+custom_template/debug=\"\""))))))
+
+(define* (build #:key inputs game export-name #:allow-other-keys)
+  (let ((godot (assoc-ref inputs "godot-headless")))
+    (invoke (string-append godot "/bin/godot_server")
+            "--export-pack" export-name (string-append game ".pck")
+            "project.godot")))
+
+(define* (install #:key inputs outputs game #:allow-other-keys)
+  (let* ((out (assoc-ref outputs "out"))
+         (bin (string-append out "/bin"))
+         (share (string-append out "/share"))
+         (data (string-append share "/" game))
+         (desktop (string-append share "/applications")))
+
+    ;; Install the binary file.
+    (install-file (string-append game ".pck") data)
+    (mkdir-p bin)
+    (call-with-output-file (string-append bin "/" game)
+      (lambda (port)
+        (format port
+                "#!/bin/sh~@
+                 exec ~a/bin/godot --main-pack ~a/~a.pck~%"
+                (assoc-ref inputs "godot") data game)
+        (chmod port #o755)))
+
+    ;; Install desktop file[s].
+    (mkdir-p desktop)
+    (for-each (lambda (file)
+                (display file)
+                (copy-file file (string-append
+                                 desktop "/"
+                                 (car (last-pair
+                                       (string-split file #\/))))))
+              (find-files "." "\\.desktop$"))))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (delete 'bootstrap)
+    (replace 'configure configure)
+    (replace 'build build)
+    (delete 'check)
+    (replace 'install install)))
+
+(define* (godot-build #:key inputs (phases %standard-phases)
+                       #:allow-other-keys #:rest args)
+  "Build the given Godot package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
-- 
2.30.2

[bug#48952] [PATCH v2 2/6] gnu: superstarfighter: Use godot-build-system.

[Vinicius Monego]

* gnu/packages/games.scm (superstarfighter)[build-system]: Use
godot-build-system.
[arguments]: Remove #:tests?. <#:game, #:project-directory>: New fields.
<#:phases>: Do not replace configure, build and install. Add phase
'install-desktop-file after 'install.
---
 gnu/packages/games.scm | 54 +++++++++---------------------------------
 1 file changed, 11 insertions(+), 43 deletions(-)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 6258d65f97..a701f7aa94 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -67,6 +67,7 @@
 ;;; Copyright © 2021 Petr Hodina <phodina@protonmail.com>
 ;;; Copyright © 2021 Brendan Tildesley <mail@brendan.scot>
 ;;; Copyright © 2021 Christopher Baines <mail@cbaines.net>
+;;; Copyright © 2021 Vinicius Monego <monego@posteo.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -209,6 +210,7 @@
   #:use-module (guix build-system glib-or-gtk)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system go)
+  #:use-module (guix build-system godot)
   #:use-module (guix build-system meson)
   #:use-module (guix build-system perl)
   #:use-module (guix build-system python)
@@ -2562,59 +2564,25 @@ modify quests for the Solarus engine.")))
              (commit "32521f467616bb390e3929d07e1936ff43fe64da")))
        (file-name (git-file-name name version))
        (sha256
+
         (base32 "1ckghzrfgvk9z1n5f4ivnamm6s8h9sbv0a3aq9pp4a3yrhkgld0k"))))
-    (build-system gnu-build-system)
+    (build-system godot-build-system)
     (arguments
-     `(#:tests? #f                      ;there are no tests
+     `(#:game ,name
+       #:project-directory "godot"
        #:phases
        (modify-phases %standard-phases
-         (replace 'configure
-           (lambda _
-             (chdir "godot")
-             (setenv "HOME" (getcwd))
-             (with-output-to-file "export_presets.cfg"
-               (lambda ()
-                 (display
-                  "[preset.0]
-name=\"Guix\"
-platform=\"Linux/X11\"
-runnable=true
-[preset.0.options]")))
-             #t))
-         (replace 'build
-           (lambda _
-             (let ((godot (assoc-ref %build-inputs "godot-headless")))
-               (invoke (string-append godot "/bin/godot_server")
-                       "--export-pack" "Guix"
-                       "superstarfighter.pck" "project.godot"))
-             #t))
-         (replace 'install
-           (lambda* (#:key inputs outputs #:allow-other-keys)
+         (add-after 'install 'install-desktop-file
+           (lambda* (#:key inputs outputs game #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))
-                    (bin (string-append out "/bin"))
-                    (share (string-append out "/share"))
-                    (data (string-append share "/superstarfighter"))
-                    (icons (string-append share "/icons/hicolor/256x256/apps")))
-               (install-file "superstarfighter.pck" data)
-               (mkdir-p bin)
-               (call-with-output-file (string-append bin "/superstarfighter")
-                 (lambda (port)
-                   (format port
-                           "#!/bin/sh~@
-                            exec ~a/bin/godot --main-pack ~a/superstarfighter.pck~%"
-                           (assoc-ref inputs "godot")
-                           data)
-                   (chmod port #o755)))
-               (mkdir-p icons)
-               (copy-file "icon.png" (string-append icons "/" ,name ".png"))
+                    (share (string-append out "/share")))
                (make-desktop-entry-file
-                (string-append share "/applications/" ,name ".desktop")
+                (string-append share "/applications/" game ".desktop")
                 #:name "SuperStarfighter"
                 #:comment "Fast-paced arcade combat game"
                 #:exec ,name
                 #:icon ,name
-                #:categories '("Game" "ArcadeGame")))
-             #t)))))
+                #:categories '("Game" "ArcadeGame"))))))))
     (native-inputs
      `(("godot-headless" ,godot "headless")))
     (inputs
-- 
2.30.2

[bug#48952] [PATCH v2 3/6] gnu: Add librerama.

[Vinicius Monego]

* gnu/packages/games.scm (librerama): New variable.
---
 gnu/packages/games.scm | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index a701f7aa94..7358630dba 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -2595,6 +2595,33 @@ available, as well as a single-player mode with AI-controlled ships.")
     (license (list license:expat         ; game
                    license:silofl1.1)))) ; fonts
 
+(define-public librerama
+  (package
+    (name "librerama")
+    (version "0.5.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://codeberg.org/librerama/librerama")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "1am88cilrjhcpgfdsrz2z31k1dgmhiqypaspaparbzk0dday2i4j"))))
+    (build-system godot-build-system)
+    (arguments
+     `(#:game ,name
+       #:export-name "GNU/Linux / *BSD - 64 Bits"))
+    (home-page "https://yeldham.itch.io/librerama")
+    (synopsis "Fast-paced arcade collection of mini-games")
+    (description
+     "Librerama is an arcade compilation of small, fast-paced games, with the
+overall objective being to play a series of mini-games (here referred as
+\"nanogames\") which progressively increase in speed and difficulty.")
+    (license (list license:gpl3+         ; game
+                   license:cc-by-sa4.0   ; assets
+                   license:silofl1.1)))) ; fonts
+
 (define %ufoai-commit "a542a87a891f96b1ab2c44d35b2f6f16859a5019")
 (define %ufoai-revision "0")
 (define %ufoai-version (git-version "2.6.0_dev" %ufoai-revision %ufoai-commit))
-- 
2.30.2

[bug#48952] [PATCH v2 4/6] gnu: Add material-maker.

[Vinicius Monego]

* gnu/packages/game-development.scm (material-maker): New variable.
---
 gnu/packages/game-development.scm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/gnu/packages/game-development.scm b/gnu/packages/game-development.scm
index 305c2c2819..f0096a4c59 100644
--- a/gnu/packages/game-development.scm
+++ b/gnu/packages/game-development.scm
@@ -25,6 +25,7 @@
 ;;; Copyright © 2020-2021 James Smith <jsubuntuxp@disroot.org>
 ;;; Copyright © 2021 Ekaitz Zarraga <ekaitz@elenq.tech>
 ;;; Copyright © 2021 Andy Tai <atai@atai.org>
+;;; Copyright © 2021 Vinicius Monego <monego@posteo.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -52,6 +53,7 @@
   #:use-module (guix utils)
   #:use-module (guix build-system cmake)
   #:use-module (guix build-system gnu)
+  #:use-module (guix build-system godot)
   #:use-module (guix build-system python)
   #:use-module (guix build-system scons)
   #:use-module (gnu packages)
@@ -622,6 +624,29 @@ development of visual novels, written on top of Guile-SDL2.  It is still
 experimental.")
     (license license:lgpl3+)))
 
+(define-public material-maker
+  (package
+    (name "material-maker")
+    (version "0.97")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/RodZill4/material-maker")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "06y4kaknrwkvwgznlyql9c5f5sjr32fadzraww3g7vcx5y240cr0"))))
+    (build-system godot-build-system)
+    (arguments
+     `(#:game ,name))
+    (home-page "https://www.materialmaker.org/")
+    (synopsis "Procedural textures authoring and 3D model painting tool")
+    (description
+     "Material Maker is a tool based on Godot Engine that can be used to
+create textures procedurally and paint 3D models.")
+    (license license:expat)))
+
 (define-public sfml
   (package
     (name "sfml")
-- 
2.30.2

[bug#48952] [PATCH v2 5/6] gnu: Add pixelorama.

[Vinicius Monego]

* gnu/packages/game-development.scm (pixelorama): New variable.
---
 gnu/packages/game-development.scm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/gnu/packages/game-development.scm b/gnu/packages/game-development.scm
index f0096a4c59..294c9ccbe9 100644
--- a/gnu/packages/game-development.scm
+++ b/gnu/packages/game-development.scm
@@ -647,6 +647,28 @@ experimental.")
 create textures procedurally and paint 3D models.")
     (license license:expat)))
 
+(define-public pixelorama
+  (package
+    (name "pixelorama")
+    (version "0.9.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/Orama-Interactive/Pixelorama")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0m08lzb3cqbv5k5nqygd22kgq6ihacc4qrsybmys3v1mv694c9wm"))))
+    (build-system godot-build-system)
+    (arguments
+     `(#:game ,name
+       #:export-name "Linux/X11 64-bit"))
+    (home-page "https://orama-interactive.itch.io/pixelorama")
+    (synopsis "2D sprite editor")
+    (description "Pixelorama is a 2D sprite editor made with Godot engine.")
+    (license license:expat)))
+
 (define-public sfml
   (package
     (name "sfml")
-- 
2.30.2

[bug#48952] [PATCH v2 6/6] gnu: Add lorien.

[Vinicius Monego]

* gnu/packages/graphics.scm (lorien): New variable.
---
 gnu/packages/graphics.scm | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gnu/packages/graphics.scm b/gnu/packages/graphics.scm
index 3f83c72599..7c06cd20d8 100644
--- a/gnu/packages/graphics.scm
+++ b/gnu/packages/graphics.scm
@@ -109,6 +109,7 @@
   #:use-module (guix build-system copy)
   #:use-module (guix build-system cmake)
   #:use-module (guix build-system gnu)
+  #:use-module (guix build-system godot)
   #:use-module (guix build-system meson)
   #:use-module (guix build-system python)
   #:use-module (guix build-system qt)
@@ -606,6 +607,35 @@ NOTE: This older version of Blender is the last release that does not require
 OpenGL 3.  It is retained for use with older computers.")
     (license license:gpl2+)))
 
+(define-public lorien
+  (package
+    (name "lorien")
+    (version "0.4.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/mbrlabs/Lorien")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0z185j87qhwhfyahkqywmdazabyf21nb3ywaba0g1dwjrylk72jj"))))
+    (build-system godot-build-system)
+    (arguments
+     `(#:game ,name
+       #:project-directory "lorien"))
+    (home-page "https://github.com/mbrlabs/Lorien")
+    (synopsis "Infinite canvas drawing/whiteboarding")
+    (description "Lorien is an infinite canvas drawing/note-taking app that is
+focused on performance, small savefiles and simplicity.  It's not based on
+bitmap images like Krita, Gimp or Photoshop; it rather saves brush strokes as
+a collection of points and renders them at runtime.  It's primarily designed
+to be used as a digital notebook and as brainstorming tool.  While it can
+totally be used to make small sketches and diagrams, it is not meant to
+replace traditional art programs that operate on bitmap images.  It is
+entirely written in the Godot Game Engine")
+    (license license:expat)))
+
 (define-public goxel
   (package
     (name "goxel")
-- 
2.30.2

[bug#48952] [PATCH v2 0/6] Add godot-build-system (v2).

[Nicolas Goaziou]

Hello,

Vinicius Monego <monego@posteo.net> writes:

> This is my second attempt. Updated to the new standards with some
> small changes and other proof of concept packages.

This looks nice. Thank you.

I just have one question: since `name' is more or less the standard
value for #:game keyword, per documentation, would it be possible to
fill it automatically?

Regards,
-- 
Nicolas Goaziou

[bug#48952] [PATCH v2 0/6] Add godot-build-system (v2).

[Vinicius Monego]

Em qui, 2021-12-30 às 10:43 +0100, Nicolas Goaziou escreveu:
> Hello,
> 
> Vinicius Monego <monego@posteo.net> writes:
> 
> > This is my second attempt. Updated to the new standards with some
> > small changes and other proof of concept packages.
> 
> This looks nice. Thank you.
> 
> I just have one question: since `name' is more or less the standard
> value for #:game keyword, per documentation, would it be possible to
> fill it automatically?
> 
> Regards,

It is possible. The problem is that reading `name' in the build system
resolves to the package name + version, e.g. (godot-3.4) instead of
just the package name which is what I need. If there is a general way
to strip the version number or only read the package name without
passing it from the definition then it can be done.

I just noticed that the #:game keyword is duplicate in godot.scm.

[bug#48952] [PATCH v2 0/6] Add godot-build-system (v2).

[Nicolas Goaziou]

Hello,

Vinicius Monego <monego@posteo.net> writes:

> This is my second attempt. Updated to the new standards with some
> small changes and other proof of concept packages.

Now you have commit rights (congratulations!), you may want to commit
this patch set!

Regards,
-- 
Nicolas Goaziou