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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 ((ice-9 rdelim) #:select (read-line))
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (rnrs bytevectors)
#:use-module (json)
#:use-module (web uri)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (guix import utils)
#:use-module (guix import json)
#:use-module (guix packages)
#:use-module (guix licenses)
#:use-module (guix build-system python)
#:use-module (gnu packages python)
#:export (pypi->guix-package))
(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 (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 (python->package-name name)
"Given the NAME of a package on PyPI, return a Guix-compliant name for the
package."
(if (string-prefix? "python-" name)
(snake-case name)
(string-append "python-" (snake-case name))))
(define (maybe-inputs package-inputs)
"Given a list of PACKAGE-INPUTS, tries to generate the 'inputs' field of a
package definition."
(match package-inputs
(()
'())
((package-inputs ...)
`((inputs (,'quasiquote ,package-inputs))))))
(define (guess-requirements source-url tarball)
"Given SOURCE-URL and a TARBALL of the package, return a list of the required
packages specified in the requirements.txt file. TARBALL will be extracted in
the current directory, and will be deleted."
(define (tarball-directory url)
;; Given the URL of the package's tarball, return the name of the directory
;; that will be created upon decompressing it. If the filetype is not
;; supported, return #f.
;; TODO: Support more archive formats.
(let ((basename (substring url (+ 1 (string-rindex url #\/)))))
(cond
((string-suffix? ".tar.gz" basename)
(string-drop-right basename 7))
((string-suffix? ".tar.bz2" basename)
(string-drop-right basename 8))
(else
(begin
(warning (_ "Unsupported archive format: \
cannot determine package dependencies"))
#f)))))
(define (clean-requirement s)
;; Given a requirement LINE, as can be found in a Python requirements.txt
;; file, remove everything other than the actual name of the required
;; package, and return it.
(string-take s
(or (string-index s #\space)
(string-length s))))
(define (comment? line)
;; Return #t if the given LINE is a comment, #f otherwise.
(eq? (string-ref (string-trim line) 0) #\#))
(define (read-requirements requirements-file)
;; Given REQUIREMENTS-FILE, a Python requirements.txt file, return a list
;; of name/variable pairs describing the requirements.
(call-with-input-file requirements-file
(lambda (port)
(let loop ((result '()))
(let ((line (read-line port)))
(if (eof-object? line)
result
(cond
((or (string-null? line) (comment? line))
(loop result))
(else
(loop (cons (python->package-name (clean-requirement line))
result))))))))))
(let ((dirname (tarball-directory source-url)))
(if (string? dirname)
(let* ((req-file (string-append dirname "/requirements.txt"))
(exit-code (system* "tar" "xf" tarball req-file)))
;; TODO: support more formats.
(if (zero? exit-code)
(dynamic-wind
(const #t)
(lambda ()
(read-requirements req-file))
(lambda ()
(delete-file req-file)
(rmdir dirname)))
(begin
(warning (_ "'tar xf' failed with exit code ~a\n")
exit-code)
'())))
'())))
(define (compute-inputs source-url tarball)
"Given the SOURCE-URL of an already downloaded TARBALL, return a list of
name/variable pairs describing the required inputs of this package."
(sort
(map (lambda (input)
(list input (list 'unquote (string->symbol input))))
(append '("python-setuptools")
;; Argparse has been part of Python since 2.7.
(remove (cut string=? "python-argparse" <>)
(guess-requirements source-url tarball))))
(lambda args
(match args
(((a _ ...) (b _ ...))
(string-ci<? a b))))))
(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."
(call-with-temporary-output-file
(lambda (temp port)
(and (url-fetch source-url temp)
`(package
(name ,(python->package-name name))
(version ,version)
(source (origin
(method url-fetch)
(uri (string-append ,@(factorize-uri source-url version)))
(sha256
(base32
,(guix-hash-url temp)))))
(build-system python-build-system)
,@(maybe-inputs (compute-inputs source-url temp))
(home-page ,home-page)
(synopsis ,synopsis)
(description ,description)
(license ,(license->symbol 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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