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;;; 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 (guix build-system elm)
#:use-module (guix store)
#:use-module (guix utils)
#:use-module (guix packages)
#:use-module (guix gexp)
#:use-module (guix monads)
#:use-module (guix search-paths)
#:use-module (guix git-download)
#:use-module (guix build-system)
#:use-module (guix build-system gnu)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (elm->package-name
guix-package->elm-name
infer-elm-package-name
elm-package-origin
%elm-build-system-modules
%elm-default-modules
elm-build
elm-build-system))
(define (elm->package-name name)
"Given the NAME of an Elm package, return a Guix-style package name."
(let ((converted
(string-join (string-split (string-downcase name) #\/) "-")))
(if (string-prefix? "elm-" converted)
converted
(string-append "elm-" converted))))
(define (guix-package->elm-name package)
"Given an Elm PACKAGE, return the possibly-inferred upstream name, or #f the
upstream name is not specified and can't be inferred."
(or (assoc-ref (package-properties package) 'upstream-name)
(infer-elm-package-name (package-name package))))
(define (infer-elm-package-name guix-name)
"Given the GUIX-NAME of an Elm package, return the inferred upstream name,
or #f if it can't be inferred. If the result is not #f, supplying it to
'elm->package-name' would produce GUIX-NAME.
See also 'guix-package->elm-name', which respects the 'upstream-name'
property."
(define (parts-join part0 parts)
(string-join (cons part0 parts) "-"))
(match (string-split guix-name #\-)
(("elm" "explorations" part0 parts ...)
(string-append "elm-explorations/"
(parts-join part0 parts)))
(("elm" owner part0 parts ...)
(string-append owner "/" (parts-join part0 parts)))
(("elm" repo)
(string-append "elm/" repo))
(_
#f)))
(define (elm-package-origin elm-name version hash)
"Return an origin for the Elm package with upstream name ELM-NAME at the
given VERSION with sha256 checksum HASH."
;; elm requires this very specific repository structure and tagging regime
(origin
(method git-fetch)
(uri (git-reference
(url (string-append "https://github.com/" elm-name))
(commit version)))
(file-name (git-file-name (elm->package-name elm-name) version))
(sha256 hash)))
(define %elm-build-system-modules
;; Build-side modules imported by default.
`((guix build elm-build-system)
(guix build json)
(guix build union)
,@%gnu-build-system-modules))
(define %elm-default-modules
;; Modules in scope in the build-side environment.
'((guix build elm-build-system)
(guix build utils)
(guix build json)
(guix build union)))
(define (default-elm)
"Return the default Elm package for builds."
;; Lazily resolve the binding to avoid a circular dependency.
(let ((elm (resolve-interface '(gnu packages elm))))
(module-ref elm 'elm)))
(define* (lower name
#:key source inputs native-inputs outputs system target
(implicit-elm-package-inputs? #t)
(elm (default-elm))
#:allow-other-keys
#:rest arguments)
"Return a bag for NAME."
(define private-keywords
'(#:target #:implicit-elm-package-inputs? #:elm #:inputs #:native-inputs))
(cond
(target
;; Cross-compilation is not yet supported. It should be easy, though,
;; since the build products are all platform-independent.
#f)
(else
(bag
(name name)
(system system)
(host-inputs
`(,@(if source
`(("source" ,source))
'())
,@inputs
("elm" ,elm)
;; TODO: probably don't need most of (standard-packages)
,@(standard-packages)))
(outputs outputs)
(build elm-build)
(arguments (strip-keyword-arguments private-keywords arguments))))))
(define* (elm-build name inputs
#:key
source
(tests? #t)
(phases '%standard-phases)
(outputs '("out"))
(search-paths '())
(system (%current-system))
(guile #f)
(imported-modules %elm-build-system-modules)
(modules %elm-default-modules))
"Build SOURCE using ELM."
(define builder
(with-imported-modules imported-modules
#~(begin
(use-modules #$@(sexp->gexp modules))
(elm-build #:name #$name
#:source #+source
#:system #$system
#:tests? #$tests?
#:phases #$phases
#:outputs #$(outputs->gexp outputs)
#: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 elm-build-system
(build-system
(name 'elm)
(description "The Elm build system")
(lower lower)))
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