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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 ftw)
#:use-module (ice-9 match)
#:use-module (ice-9 peg)
#:use-module (ice-9 receive)
#:use-module ((ice-9 rdelim) #:select (read-line))
#:use-module (ice-9 textual-ports)
#:use-module (ice-9 vlist)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-2)
#:use-module (web uri)
#:use-module (guix http-client)
#:use-module (guix git)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (guix import utils)
#:use-module ((guix licenses) #:prefix license:)
#:export (opam->guix-package))
;; Define a PEG parser for the opam format
(define-peg-pattern SP none (or " " "\n"))
(define-peg-pattern SP2 body (or " " "\n"))
(define-peg-pattern QUOTE none "\"")
(define-peg-pattern QUOTE2 body "\"")
(define-peg-pattern COLON none ":")
;; A string character is any character that is not a quote, or a quote preceded by a backslash.
(define-peg-pattern STRCHR body
(or " " "!" (and (ignore "\\") "\"")
(and (ignore "\\") "\\") (range #\# #\頋)))
(define-peg-pattern operator all (or "=" "!" "<" ">"))
(define-peg-pattern records body (* (and (or record weird-record) (* SP))))
(define-peg-pattern record all (and key COLON (* SP) value))
(define-peg-pattern weird-record all (and key (* SP) dict))
(define-peg-pattern key body (+ (or (range #\a #\z) "-")))
(define-peg-pattern value body (and (or conditional-value ground-value operator) (* SP)))
(define-peg-pattern ground-value body (and (or multiline-string string-pat list-pat var) (* SP)))
(define-peg-pattern conditional-value all (and ground-value (* SP) condition))
(define-peg-pattern string-pat all (and QUOTE (* STRCHR) QUOTE))
(define-peg-pattern list-pat all (and (ignore "[") (* SP) (* (and value (* SP))) (ignore "]")))
(define-peg-pattern var all (+ (or (range #\a #\z) "-")))
(define-peg-pattern multiline-string all
(and QUOTE QUOTE QUOTE (* SP)
(* (or SP2 STRCHR (and QUOTE2 (not-followed-by QUOTE))
(and QUOTE2 QUOTE2 (not-followed-by QUOTE))))
QUOTE QUOTE QUOTE))
(define-peg-pattern dict all (and (ignore "{") (* SP) records (* SP) (ignore "}")))
(define-peg-pattern condition body (and (ignore "{") condition-form (ignore "}")))
(define-peg-pattern condition-form body
(and
(* SP)
(or condition-and condition-or condition-form2)
(* SP)))
(define-peg-pattern condition-form2 body
(and (* SP) (or condition-greater-or-equal condition-greater
condition-lower-or-equal condition-lower
condition-neq condition-eq condition-content) (* SP)))
;(define-peg-pattern condition-operator all (and (ignore operator) (* SP) condition-string))
(define-peg-pattern condition-greater-or-equal all (and (ignore (and ">" "=")) (* SP) condition-string))
(define-peg-pattern condition-greater all (and (ignore ">") (* SP) condition-string))
(define-peg-pattern condition-lower-or-equal all (and (ignore (and "<" "=")) (* SP) condition-string))
(define-peg-pattern condition-lower all (and (ignore "<") (* SP) condition-string))
(define-peg-pattern condition-and all (and condition-form2 (* SP) (? (ignore "&")) (* SP) condition-form))
(define-peg-pattern condition-or all (and condition-form2 (* SP) (ignore "|") (* SP) condition-form))
(define-peg-pattern condition-eq all (and condition-content (* SP) (ignore "=") (* SP) condition-content))
(define-peg-pattern condition-neq all (and condition-content (* SP) (ignore (and "!" "=")) (* SP) condition-content))
(define-peg-pattern condition-content body (or condition-string condition-var))
(define-peg-pattern condition-content2 body (and condition-content (* SP) (not-followed-by (or "&" "=" "!"))))
(define-peg-pattern condition-string all (and QUOTE (* STRCHR) QUOTE))
(define-peg-pattern condition-var all (+ (or (range #\a #\z) "-")))
(define (get-opam-repository)
"Update or fetch the latest version of the opam repository and return the
path to the repository."
(receive (location commit)
(update-cached-checkout "https://github.com/ocaml/opam-repository")
location))
(define (latest-version versions)
"Find the most recent version from a list of versions."
(fold (lambda (a b) (if (version>? a b) a b)) (car versions) versions))
(define (find-latest-version package repository)
"Get the latest version of a package as described in the given repository."
(let* ((dir (string-append repository "/packages/" package))
(versions (scandir dir (lambda (name) (not (string-prefix? "." name))))))
(if versions
(let ((versions (map
(lambda (dir)
(string-join (cdr (string-split dir #\.)) "."))
versions)))
(latest-version versions))
(begin
(format #t (G_ "Package not found in opam repository: ~a~%") package)
#f))))
(define (get-metadata opam-file)
(with-input-from-file opam-file
(lambda _
(peg:tree (match-pattern records (get-string-all (current-input-port)))))))
(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 (metadata-ref file lookup)
(pk 'file file 'lookup lookup)
(fold (lambda (record acc)
(match record
((record key val)
(if (equal? key lookup)
(match val
(('list-pat . stuff) stuff)
(('string-pat stuff) stuff)
(('multiline-string stuff) stuff)
(('dict records ...) records))
acc))))
#f file))
(define (native? condition)
(match condition
(('condition-var var)
(match var
("with-test" #t)
("test" #t)
("build" #t)
(_ #f)))
((or ('condition-or cond-left cond-right) ('condition-and cond-left cond-right))
(or (native? cond-left)
(native? cond-right)))
(_ #f)))
(define (dependency->input dependency)
(match dependency
(('string-pat str) str)
(('conditional-value val condition)
(if (native? condition) "" (dependency->input val)))))
(define (dependency->native-input dependency)
(match dependency
(('string-pat str) "")
(('conditional-value val condition)
(if (native? condition) (dependency->input val) ""))))
(define (ocaml-names->guix-names names)
(map ocaml-name->guix-name
(remove (lambda (name)
(or (equal? "" name))
(equal? "ocaml" name))
names)))
(define (depends->inputs depends)
(filter (lambda (name)
(and (not (equal? "" name))
(not (equal? "ocaml" name))
(not (equal? "ocamlfind" name))))
(map dependency->input depends)))
(define (depends->native-inputs depends)
(filter (lambda (name) (not (equal? "" name)))
(map dependency->native-input depends)))
(define (dependency-list->inputs lst)
(map
(lambda (dependency)
(list dependency (list 'unquote (string->symbol dependency))))
(ocaml-names->guix-names lst)))
(define (opam->guix-package name)
(and-let* ((repository (get-opam-repository))
(version (find-latest-version name repository))
(file (string-append repository "/packages/" name "/" name "." (pk 'version version) "/opam"))
(opam-content (get-metadata file))
(url-dict (metadata-ref (pk 'metadata opam-content) "url"))
(source-url (metadata-ref url-dict "src"))
(requirements (metadata-ref opam-content "depends"))
(inputs (dependency-list->inputs (depends->inputs requirements)))
(native-inputs (dependency-list->inputs (depends->native-inputs requirements))))
(call-with-temporary-output-file
(lambda (temp port)
(and (url-fetch source-url temp)
`(package
(name ,(ocaml-name->guix-name name))
(version ,(metadata-ref opam-content "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))))
,@(if (null? native-inputs)
'()
`((native-inputs ,(list 'quasiquote native-inputs))))
(home-page ,(metadata-ref opam-content "homepage"))
(synopsis ,(metadata-ref opam-content "synopsis"))
(description ,(metadata-ref opam-content "description"))
(license #f)))))))
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