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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 David Thompson <davet@gnu.org>
;;;
;;; 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 pypi)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 match)
#:use-module (ice-9 pretty-print)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (rnrs bytevectors)
#:use-module (json)
#:use-module (web uri)
#:use-module (guix utils)
#:use-module (guix import utils)
#:use-module (guix base32)
#:use-module (guix hash)
#:use-module (guix packages)
#:use-module (guix licenses)
#:use-module (guix build-system python)
#:use-module ((guix build download) #:prefix build:)
#:use-module (gnu packages python)
#:export (pypi->guix-package))
(define (hash-table->alist table)
"Return an alist represenation of TABLE."
(map (match-lambda
((key . (lst ...))
(cons key
(map (lambda (x)
(if (hash-table? x)
(hash-table->alist x)
x))
lst)))
((key . (? hash-table? table))
(cons key (hash-table->alist table)))
(pair pair))
(hash-map->list cons table)))
(define (flatten lst)
"Return a list that recursively concatenates all sub-lists of LIST."
(fold-right
(match-lambda*
(((sub-list ...) memo)
(append (flatten sub-list) memo))
((elem memo)
(cons elem memo)))
'() lst))
(define (join lst delimiter)
"Return a list that contains the elements of LST, each separated by
DELIMETER."
(match lst
(() '())
((elem)
(list elem))
((elem . rest)
(cons* elem delimiter (join rest delimiter)))))
(define (assoc-ref* alist key . rest)
"Return the value for KEY from ALIST. For each additional key specified,
recursively apply the procedure to the sub-list."
(if (null? rest)
(assoc-ref alist key)
(apply assoc-ref* (assoc-ref alist key) rest)))
(define string->license
(match-lambda
("GNU LGPL" lgpl2.0)
("GPL" gpl3)
((or "BSD" "BSD License") bsd-3)
((or "MIT" "MIT license" "Expat license") expat)
("Public domain" public-domain)
("Apache License, Version 2.0" asl2.0)
(_ #f)))
(define (url-fetch url file-name)
"Save the contents of URL to FILE-NAME. Return #f on failure."
(parameterize ((current-output-port (current-error-port)))
(build:url-fetch url file-name)))
(define (json-fetch url)
"Return an alist representation of the JSON resource URL, or #f on failure."
(call-with-temporary-output-file
(lambda (temp port)
(and (url-fetch url temp)
(hash-table->alist
(call-with-input-file temp json->scm))))))
(define (pypi-fetch name)
"Return an alist representation of the PyPI metadata for the package NAME,
or #f on failure."
(json-fetch (string-append "https://pypi.python.org/pypi/" name "/json")))
(define (latest-source-release pypi-package)
"Return the latest source release for PYPI-PACKAGE."
(let ((releases (assoc-ref* pypi-package "releases"
(assoc-ref* pypi-package "info" "version"))))
(or (find (lambda (release)
(string=? "sdist" (assoc-ref release "packagetype")))
releases)
(error "No source release found for pypi package: "
(assoc-ref* pypi-package "info" "name")
(assoc-ref* pypi-package "info" "version")))))
(define (snake-case str)
"Return a downcased version of the string STR where underscores are replaced
with dashes."
(string-join (string-split (string-downcase str) #\_) "-"))
(define (guix-hash-url url)
"Download the resource at URL and return the hash in nix-base32 format."
(call-with-temporary-output-file
(lambda (temp port)
(and (url-fetch url temp)
(bytevector->nix-base32-string
(call-with-input-file temp port-sha256))))))
(define (make-pypi-sexp name version source-url home-page synopsis
description license)
"Return the `package' s-expression for a python package with the given NAME,
VERSION, SOURCE-URL, HOME-PAGE, SYNOPSIS, DESCRIPTION, and LICENSE."
`(package
(name ,(if (string-prefix? "python-" name)
(snake-case name)
(string-append "python-" (snake-case name))))
(version ,version)
(source (origin
(method url-fetch)
(uri (string-append ,@(factorize-uri source-url version)))
(sha256
(base32
,(guix-hash-url source-url)))))
(build-system python-build-system)
(inputs
`(("python-setuptools" ,python-setuptools)))
(home-page ,home-page)
(synopsis ,synopsis)
(description ,description)
(license ,(assoc-ref `((,lgpl2.0 . lgpl2.0)
(,gpl3 . gpl3)
(,bsd-3 . bsd-3)
(,expat . expat)
(,public-domain . public-domain)
(,asl2.0 . asl2.0))
license))))
(define (pypi->guix-package package-name)
"Fetch the metadata for PACKAGE-NAME from pypi.python.org, and return the
`package' s-expression corresponding to that package, or #f on failure."
(let ((package (pypi-fetch package-name)))
(and package
(let ((name (assoc-ref* package "info" "name"))
(version (assoc-ref* package "info" "version"))
(release (assoc-ref (latest-source-release package) "url"))
(synopsis (assoc-ref* package "info" "summary"))
(description (assoc-ref* package "info" "summary"))
(home-page (assoc-ref* package "info" "home_page"))
(license (string->license (assoc-ref* package "info" "license"))))
(make-pypi-sexp name version release home-page synopsis
description license)))))
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