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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Cyril Roelandt <tipecaml@gmail.com>
+;;; Copyright © 2016 David Craven <david@craven.ch>
+;;; Copyright © 2017, 2019-2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2019 Martin Becze <mjbecze@riseup.net>
+;;; Copyright © 2019 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2020-2022 Hartmut Goebel <h.goebel@crazy-compilers.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 import hexpm)
+  #:use-module (guix base32)
+  #:use-module ((guix download) #:prefix download:)
+  #:use-module (gcrypt hash)
+  #:use-module (guix http-client)
+  #:use-module (json)
+  #:use-module (guix import utils)
+  #:use-module ((guix import json) #:select (json-fetch))
+  #:use-module ((guix build utils)
+                #:select ((package-name->name+version
+                           . hyphen-package-name->name+version)
+                          dump-port))
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix monads)
+  #:use-module (guix packages)
+  #:use-module (guix upstream)
+  #:use-module (guix utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (ice-9 popen)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-2)
+  #:use-module (srfi srfi-26)
+  #:use-module (guix build-system rebar)
+  #:export (hexpm->guix-package
+            guix-package->hexpm-name
+            strings->licenses   ;;  why used here?
+            hexpm-recursive-import
+            %hexpm-updater))
+
+;;;
+;;; Interface to https://hex.pm/api, version 2.
+;;; REST-API end-points:
+;;;   https://github.com/hexpm/specifications/blob/master/apiary.apib
+;;; Repository end-points:
+;;;   https://github.com/hexpm/specifications/blob/master/endpoints.md
+;;;
+
+(define %hexpm-api-url
+  (make-parameter "https://hex.pm/api"))
+
+(define (package-url name)
+  (string-append (%hexpm-api-url) "/packages/" name))
+
+;;
+;; Hexpm Package. /packages/${name}
+;; https://github.com/hexpm/specifications/blob/master/apiary.apib#Package
+;;
+;; Each package can have several "releases", each of which has its own set of
+;; requirements, build-tool, etc. - see <hexpm-release> below.
+(define-json-mapping <hexpm-pkgdef> make-hexpm-pkgdef hexpm-pkgdef?
+  json->hexpm
+  (name          hexpm-name)                          ; string
+  (html-url      hexpm-html-url      "html_url")      ; string
+  (docs-html-url hexpm-docs-html-url "docs_html_url") ; string | 'null
+  (meta          hexpm-meta "meta" json->hexpm-meta)
+  (versions      hexpm-versions "releases" ; list of <hexpm-version>
+                 (lambda (vector)
+                   (map json->hexpm-version
+                        (vector->list vector))))
+  ;; "latest_version" and "latest_stable_version" are not named in the
+  ;; specification, butt seen in practice.
+  (latest-version hexpm-latest-version "latest_version") ; string
+  (latest-stable  hexpm-latest-stable "latest_stable_version")) ; string
+
+;; Hexpm package metadata.
+(define-json-mapping <hexpm-meta> make-hexpm-meta hexpm-meta?
+  json->hexpm-meta
+  (description hexpm-meta-description)        ;string
+  (licenses    hexpm-meta-licenses "licenses" ;list of strings
+               (lambda (vector)
+                 (or (and vector (vector->list vector))
+                     #f))))
+
+;; Hexpm package versions.
+(define-json-mapping <hexpm-version> make-hexpm-version hexpm-version?
+  json->hexpm-version
+  (number  hexpm-version-number "version")   ;string
+  (url     hexpm-version-url))               ;string
+
+
+(define (lookup-hexpm name)
+  "Look up NAME on hex.pm and return the corresopnding <hexpm> record
+or #f if it was not found."
+  (and=> (json-fetch (package-url name))
+         json->hexpm))
+
+;;
+;; Hexpm release. /packages/${name}/releases/${version}
+;; https://github.com/hexpm/specifications/blob/master/apiary.apib#Release
+;;
+(define-json-mapping <hexpm-release> make-hexpm-release hexpm-release?
+  json->hexpm-release
+  (version hexpm-release-version)  ; string
+  (url     hexpm-release-url)      ; string
+  (meta    hexpm-release-meta "meta" json->hexpm-release-meta)
+  ;; Specification names the next fields "dependencies", but in practice it is
+  ;; "requirements".
+  (dependencies hexpm-requirements "requirements")) ; list of <hexpm-dependency>
+
+;; Hexpm release meta.
+;; https://github.com/hexpm/specifications/blob/main/package_metadata.md
+(define-json-mapping <hexpm-release-meta>
+  make-hexpm-release-meta hexpm-release-meta?
+  json->hexpm-release-meta
+  (app         hexpm-release-meta-app)        ; string
+  (elixir      hexpm-release-meta-elixir)     ; string
+  (build-tools hexpm-release-meta-build-tools "build_tools" ; list of strings
+               (lambda (vector)
+                 (or (and vector (vector->list vector))
+                     (list)))))
+
+;; Hexpm dependency.  Each requirement has information about the required
+;; version, such as "~> 2.1.2" or ">= 2.1.2 and < 2.2.0", see
+;; <https://hexdocs.pm/elixir/Version.html#module-requirements>, and whether
+;; the dependency is optional.
+(define-json-mapping <hexpm-dependency> make-hexpm-dependency
+  hexpm-dependency?
+  json->hexpm-dependency
+  (name        hexpm-dependency-name "app")   ; string
+  (requirement hexpm-dependency-requirement)  ; string
+  (optional    hexpm-dependency-optional))    ; bool
+
+(define (hexpm-release-dependencies release)
+  "Return the list of dependency names of RELEASE, a <hexpm-release>."
+  (let ((reqs (or (hexpm-requirements release) '#())))
+    (map first reqs)))  ;; TODO: also return required version
+
+
+(define (lookup-hexpm-release version*)
+  "Look up RELEASE on hexpm-version-url and return the corresopnding
+<hexpm-release> record or #f if it was not found."
+  (and=> (json-fetch (hexpm-version-url version*))
+         json->hexpm-release))
+
+
+;;;
+;;; Converting hex.pm packages to Guix packages.
+;;;
+
+(define (maybe-inputs package-inputs input-type)
+  "Given a list of PACKAGE-INPUTS, tries to generate the 'inputs' field of a
+package definition.  INPUT-TYPE, a symbol, is used to populate the name of
+the input field."
+  (match package-inputs
+    (()
+     '())
+    ((package-inputs ...)
+     `((,input-type (list ,@package-inputs))))))
+
+(define (dependencies->package-names names)
+  "Given a list of hexpm package NAMES, returns a list of guix package names
+as symbols."
+  ;; TODO: Base name on language of dependency.
+  ;; The language used for implementing the dependency is not know without
+  ;; recursing the dependencies.  So for now assume more packages are based on
+  ;; Erlang and prefix all dependencies with "erlang-" (the default).
+  (map string->symbol
+       (map hexpm-name->package-name
+            (sort names string-ci<?))))
+
+(define* (make-hexpm-sexp #:key name version tarball-url
+                          home-page synopsis description license
+                          language build-system dependencies
+                          #:allow-other-keys)
+  "Return the `package' s-expression for a hexpm package with the given NAME,
+VERSION, TARBALL-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and LICENSE. The
+created package's name will stem from LANGUAGE. BUILD-SYSTEM defined the
+build-system, and DEPENDENCIES the inputs for the package."
+  (call-with-temporary-output-file
+   (lambda (temp port)
+     (and (url-fetch tarball-url temp)
+          (values
+       `(package
+         (name ,(hexpm-name->package-name name language))
+         (version ,version)
+         (source (origin
+                   (method url-fetch)
+                   (uri (hexpm-uri ,name version))
+                   (sha256 (base32 ,(guix-hash-url temp)))))
+         (build-system ,build-system)
+         ,@(maybe-inputs (dependencies->package-names dependencies) 'inputs)
+         (synopsis ,synopsis)
+         (description ,(beautify-description description))
+         (home-page ,(match home-page
+                            (() "")
+                            (_ home-page)))
+         (license ,(match license
+                          (() #f)
+                          ((license) license)
+                          (_ `(list ,@license))))))))))
+
+(define (strings->licenses strings)
+  "Convert the list of STRINGS into a list of license objects."
+  (filter-map (lambda (license)
+                (and (not (string-null? license))
+                     (not (any (lambda (elem) (string=? elem license))
+                               '("AND" "OR" "WITH")))
+                     (or (spdx-string->license license)
+                         license)))
+              strings))
+
+(define (hexpm-latest-release package)
+  "Return the version string for the latest stable release of PACKAGE."
+  ;; Use latest-stable if specified (see comment in hexpm-pkgdef above),
+  ;; otherwise compare the lists of release versions.
+  (let ((latest-stable (hexpm-latest-stable package)))
+    (if (not (unspecified? latest-stable))
+        latest-stable
+        (let ((versions (map hexpm-version-number (hexpm-versions package))))
+          (fold (lambda (a b)
+                  (if (version>? a b) a b)) (car versions) versions)))))
+
+(define* (hexpm->guix-package package-name #:key repo version)
+  "Fetch the metadata for PACKAGE-NAME from hexpms.io, and return the
+`package' s-expression corresponding to that package, or #f on failure.
+When VERSION is specified, attempt to fetch that version; otherwise fetch the
+latest version of PACKAGE-NAME."
+
+  (define package
+    (lookup-hexpm package-name))
+
+  (define version-number
+    (and package
+         (or version
+             (hexpm-latest-release package))))
+
+  (define version*
+    (and package
+         (find (lambda (version)
+                 (string=? (hexpm-version-number version)
+                           version-number))
+               (hexpm-versions package))))
+
+  (define release
+    (and package version*
+         (lookup-hexpm-release version*)))
+
+  (define release-meta
+    (and package version*
+         (hexpm-release-meta release)))
+
+  (define build-system
+    (and package version*
+         (let ((build-tools (hexpm-release-meta-build-tools release-meta)))
+           (cond
+            ((member "rebar3" build-tools) 'rebar-build-system)
+            ((member "mix" build-tools) 'mix-build-system)
+            ((member "make" build-tools) 'gnu-build-system)
+            (else #f)))))
+
+  (define language
+    (and package version*
+         (let ((elixir (hexpm-release-meta-elixir release-meta)))
+           (cond
+            ((and (string? elixir) (not (string-null? elixir))) "elixir")
+            (else "erlang")))))
+
+  (and package version*
+       (let ((dependencies  (hexpm-release-dependencies release))
+             (pkg-meta      (hexpm-meta package))
+             (docs-html-url (hexpm-docs-html-url package)))
+         (values
+          (make-hexpm-sexp
+           #:language language
+           #:build-system build-system
+           #:name package-name
+           #:version version-number
+           #:dependencies dependencies
+           #:home-page (or (and (not (eq? docs-html-url 'null))
+                                docs-html-url)
+                           ;; TODO: Homepage?
+                           (hexpm-html-url package))
+           #:synopsis (hexpm-meta-description pkg-meta)
+           #:description (hexpm-meta-description pkg-meta)
+           #:license (or (and=> (hexpm-meta-licenses pkg-meta)
+                                strings->licenses))
+           #:tarball-url (hexpm-uri package-name version-number))
+          dependencies))))
+
+(define* (hexpm-recursive-import pkg-name #:optional version)
+  (recursive-import pkg-name
+                    #:version version
+                    #:repo->guix-package hexpm->guix-package
+                    #:guix-name hexpm-name->package-name))
+
+(define (guix-package->hexpm-name package)
+  "Return the hex.pm name of PACKAGE."
+  (define (url->hexpm-name url)
+    (hyphen-package-name->name+version
+     (basename (file-sans-extension url))))
+
+  (match (and=> (package-source package) origin-uri)
+    ((? string? url)
+     (url->hexpm-name url))
+    ((lst ...)
+     (any url->hexpm-name lst))
+    (#f #f)))
+
+(define* (hexpm-name->package-name name #:optional (language "erlang"))
+  (string-append language "-" (string-join (string-split name #\_) "-")))
+
+
+;;;
+;;; Updater
+;;;
+
+(define (latest-release package)
+  "Return an <upstream-source> for the latest release of PACKAGE."
+  (let* ((hexpm-name (guix-package->hexpm-name package))
+         (hexpm      (lookup-hexpm hexpm-name))
+         (version    (hexpm-latest-release hexpm))
+         (url        (hexpm-uri hexpm-name version)))
+    (upstream-source
+     (package (package-name package))
+     (version version)
+     (urls (list url)))))
+
+(define %hexpm-updater
+  (upstream-updater
+   (name 'hexpm)
+   (description "Updater for hex.pm packages")
+   (pred (url-prefix-predicate hexpm-package-url))
+   (latest latest-release)))