;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014 David Thompson ;;; ;;; 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 . (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 utils) #:use-module (guix import utils) #:use-module (guix import json) #:use-module (guix base32) #:use-module (guix hash) #: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 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 (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 filename) "Return the hash of FILENAME in nix-base32 format." (bytevector->nix-base32-string (file-sha256 filename))) (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 python->package-name inputs) (match inputs (() '()) ((inputs ...) `((,python->package-name (,'quasiquote ,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." (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." ;; 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 #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"))) ;; TODO: support more formats. (if (zero? (system* "tar" "xf" tarball req-file)) (dynamic-wind (const #t) (lambda () (read-requirements req-file)) (lambda () (delete-file req-file) (rmdir dirname))) '())) '()))) (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-cipackage-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 'inputs (compute-inputs source-url temp)) (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)))))