guix: Add elm-build-system.

* gnu/packages/patches/elm-offline-package-registry.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/elm.scm (elm): Use it.
* guix/build-system/elm.scm, guix/build/elm-build-system.scm,
tests/elm.scm: New files.
* Makefile.scm (MODULES, SCM_TESTS): Add them.
* doc/guix.texi (Build Systems): Document 'elm-build-system'.
* doc/contributing.texi (Elm Packages): New section. Document naming
conventions and utilities.

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

1 files changed, 97 insertions, 0 deletions

diff --git a/tests/elm.scm b/tests/elm.scm
new file mode 100644
index 0000000000..96f958f060
--- /dev/null
+++ b/tests/elm.scm
@@ -0,0 +1,97 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Philip McGrath <philip@philipmcgrath.com>
+;;;
+;;; 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 (test-elm)
+  #:use-module (guix build-system elm)
+  #:use-module (srfi srfi-64))
+
+(test-begin "elm")
+
+(test-group "elm->package-name and infer-elm-package-name"
+  (test-group "round trip"
+    ;; Cases when our heuristics can find the upstream name.
+    (define-syntax-rule (test-round-trip elm guix)
+      (test-group elm
+        (test-equal "elm->package-name" guix
+                    (elm->package-name elm))
+        (test-equal "infer-elm-package-name" elm
+                    (infer-elm-package-name guix))))
+    (test-round-trip "elm/core" "elm-core")
+    (test-round-trip "elm/html" "elm-html")
+    (test-round-trip "elm-explorations/markdown" "elm-explorations-markdown")
+    (test-round-trip "elm-explorations/test" "elm-explorations-test")
+    (test-round-trip "elm-explorations/foo-bar" "elm-explorations-foo-bar")
+    (test-round-trip "elm/explorations" "elm-explorations")
+    (test-round-trip "terezka/intervals" "elm-terezka-intervals")
+    (test-round-trip "justinmimbs/time-extra" "elm-justinmimbs-time-extra")
+    (test-round-trip "danhandrea/elm-date-format"
+                     "elm-danhandrea-elm-date-format"))
+  (test-group "upstream-name needed"
+    ;; Upstream names that our heuristic can't infer.  We still check that the
+    ;; round-trip behavior of 'infer-elm-package-name' works as promised for
+    ;; the hypothetical Elm name it doesn't infer.
+    (define-syntax-rule (test-upstream-needed elm guix inferred)
+      (test-group elm
+        (test-equal "elm->package-name" guix
+                    (elm->package-name elm))
+        (test-group "infer-elm-package-name"
+          (test-equal "infers other name" inferred
+                      (infer-elm-package-name guix))
+          (test-equal "infered name round-trips" guix
+                      (elm->package-name inferred)))))
+    (test-upstream-needed "elm/virtual-dom"
+                          "elm-virtual-dom"
+                          "virtual/dom")
+    (test-upstream-needed "elm/project-metadata-utils"
+                          "elm-project-metadata-utils"
+                          "project/metadata-utils")
+    (test-upstream-needed "explorations/foo"
+                          "elm-explorations-foo"
+                          "elm-explorations/foo")
+    (test-upstream-needed "explorations/foo-bar"
+                          "elm-explorations-foo-bar"
+                          "elm-explorations/foo-bar")
+    (test-upstream-needed "explorations-central/foo"
+                          "elm-explorations-central-foo"
+                          "elm-explorations/central-foo")
+    (test-upstream-needed "explorations-central/foo-bar"
+                          "elm-explorations-central-foo-bar"
+                          "elm-explorations/central-foo-bar")
+    (test-upstream-needed "elm-xyz/foo"
+                          "elm-xyz-foo"
+                          "xyz/foo")
+    (test-upstream-needed "elm-xyz/foo-bar"
+                          "elm-xyz-foo-bar"
+                          "xyz/foo-bar")
+    (test-upstream-needed "elm-explorations-xyz/foo"
+                          "elm-explorations-xyz-foo"
+                          "elm-explorations/xyz-foo")
+    (test-upstream-needed "elm-explorations-xyz/foo-bar"
+                          "elm-explorations-xyz-foo-bar"
+                          "elm-explorations/xyz-foo-bar"))
+  (test-group "no inferred Elm name"
+    ;; Cases that 'infer-elm-package-name' should not attempt to handle,
+    ;; because 'elm->package-name' would never produce such names.
+    (define-syntax-rule (test-not-inferred guix)
+      (test-assert guix (not (infer-elm-package-name guix))))
+    (test-not-inferred "elm")
+    (test-not-inferred "guile")
+    (test-not-inferred "gcc-toolchain")
+    (test-not-inferred "font-adobe-source-sans-pro")))
+
+(test-end "elm")