aboutsummaryrefslogtreecommitdiff
path: root/guix/import/opam.scm
blob: f252bdc31ab6bab36f6a9c2562e669bb80400351 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
;;; 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")))))))))))