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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Julien Lepiller <julien@lepiller.eu>
;;;
;;; 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 opam)
#:use-module (ice-9 match)
#:use-module (ice-9 vlist)
#:use-module ((ice-9 rdelim) #:select (read-line))
#:use-module (srfi srfi-1)
#:use-module (web uri)
#:use-module (guix http-client)
#:use-module (guix utils)
#:use-module (guix import utils)
#:use-module ((guix licenses) #:prefix license:)
#:export (opam->guix-package))
(define (opam-urls)
"Fetch the urls.txt file from the opam repository and returns the list of
URLs it contains."
(let ((port (http-fetch/cached (string->uri "https://opam.ocaml.org/urls.txt"))))
(let loop ((result '()))
(let ((line (read-line port)))
(if (eof-object? line)
(begin
(close port)
result)
(loop (cons line result)))))))
(define (vhash-ref hashtable key default)
(match (vhash-assoc key hashtable)
(#f default)
((_ . x) x)))
(define (hashtable-update hashtable line)
"Parse @var{line} to get the name and version of the package and adds them
to the hashtable."
(let* ((line (string-split line #\ )))
(match line
((url foo ...)
(if (equal? url "repo")
hashtable
(match (string-split url #\/)
((type name1 versionstr foo ...)
(if (equal? type "packages")
(match (string-split versionstr #\.)
((name2 versions ...)
(let ((version (string-join versions ".")))
(if (equal? name1 name2)
(let ((curr (vhash-ref hashtable name1 '())))
(vhash-cons name1 (cons version curr) hashtable))
hashtable)))
(_ hashtable))
hashtable))
(_ hashtable))))
(_ hashtable))))
(define (urls->hashtable urls)
"Transform urls.txt in a hashtable whose keys are package names and values
the list of available versions."
(let ((hashtable vlist-null))
(let loop ((urls urls) (hashtable hashtable))
(match urls
(() hashtable)
((url rest ...) (loop rest (hashtable-update hashtable url)))))))
(define (latest-version versions)
"Find the most recent version from a list of versions."
(match versions
((first rest ...)
(let loop ((versions rest) (m first))
(match versions
(() m)
((first rest ...)
(loop rest (if (version>? m first) m first))))))))
(define (fetch-package-url uri)
"Fetch and parse the url file. Return the URL the package can be downloaded
from."
(let ((port (http-fetch uri)))
(let loop ((result #f))
(let ((line (read-line port)))
(if (eof-object? line)
(begin
(close port)
result)
(let* ((line (string-split line #\ )))
(match line
((key value rest ...)
(if (member key '("archive:" "http:"))
(loop (string-trim-both value #\"))
(loop result))))))))))
(define (fetch-package-metadata uri)
"Fetch and parse the opam file. Return an association list containing the
homepage, the license and the list of inputs."
(let ((port (http-fetch uri)))
(let loop ((result '()) (dependencies? #f))
(let ((line (read-line port)))
(if (eof-object? line)
(begin
(close port)
result)
(let* ((line (string-split line #\ )))
(match line
((key value ...)
(let ((dependencies?
(if dependencies?
(not (equal? key "]"))
(equal? key "depends:")))
(val (string-trim-both (string-join value "") #\")))
(cond
((equal? key "homepage:")
(loop (cons `("homepage" . ,val) result) dependencies?))
((equal? key "license:")
(loop (cons `("license" . ,val) result) dependencies?))
((and dependencies? (not (equal? val "[")))
(match (string-split val #\{)
((val rest ...)
(let ((curr (assoc-ref result "inputs"))
(new (string-trim-both
val (list->char-set '(#\] #\[ #\")))))
(loop (cons `("inputs" . ,(cons new (if curr curr '()))) result)
(if (string-contains val "]") #f dependencies?))))))
(else (loop result dependencies?))))))))))))
(define (string->license str)
(cond
((equal? str "MIT") '(license:expat))
((equal? str "GPL2") '(license:gpl2))
((equal? str "LGPLv2") '(license:lgpl2))
(else `())))
(define (ocaml-name->guix-name name)
(cond
((equal? name "ocamlfind") "ocaml-findlib")
((string-prefix? "ocaml" name) name)
((string-prefix? "conf-" name) (substring name 5))
(else (string-append "ocaml-" name))))
(define (dependencies->inputs dependencies)
"Transform the list of dependencies in a list of inputs."
(if (not dependencies)
'()
(map (lambda (input)
(list input (list 'unquote (string->symbol input))))
(map ocaml-name->guix-name dependencies))))
(define (opam->guix-package name)
(let* ((hashtable (urls->hashtable (opam-urls)))
(versions (vhash-ref hashtable name #f)))
(unless (eq? versions #f)
(let* ((version (latest-version versions))
(package-url (string-append "https://opam.ocaml.org/packages/" name
"/" name "." version "/"))
(url-url (string-append package-url "url"))
(opam-url (string-append package-url "opam"))
(source-url (fetch-package-url url-url))
(metadata (fetch-package-metadata opam-url))
(dependencies (assoc-ref metadata "inputs"))
(inputs (dependencies->inputs dependencies)))
(call-with-temporary-output-file
(lambda (temp port)
(and (url-fetch source-url temp)
`(package
(name ,(ocaml-name->guix-name name))
(version ,version)
(source
(origin
(method url-fetch)
(uri ,source-url)
(sha256 (base32 ,(guix-hash-url temp)))))
(build-system ocaml-build-system)
,@(if (null? inputs)
'()
`((inputs ,(list 'quasiquote inputs))))
(home-page ,(assoc-ref metadata "homepage"))
(synopsis "")
(description "")
(license ,@(string->license (assoc-ref metadata "license")))))))))))
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