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authorDavid Thompson <dthompson2@worcester.edu>2014-09-27 10:16:23 -0400
committerDavid Thompson <dthompson2@worcester.edu>2014-09-29 19:30:28 -0400
commit1b3e968512ebbccf02d00c52f7e089156946f445 (patch)
treec45d203439ab9a74d01f2c76850cafb847a755e2 /guix/import/pypi.scm
parent2efb3ddaa434b86a841dffbba89e21d2d9208526 (diff)
import: Add PyPI importer.
* guix/snix.scm: Delete. * guix/import/snix.scm: New file. * guix/import/pypi.scm: New file. * guix/import/utils.scm: New file. * guix/scripts/import/nix.scm: New file. * guix/scripts/import/pypi.scm: New file. * tests/pypi.scm: New file. * tests/snix.scm: Import (guix import snix) module. * guix/scripts/import.scm (%default-options, %options): Delete. (%standard-import-options, importers): New variables. (show-help): List importers. (guix-import): Factor out Nix-specific logic. Delegate to correct importer based upon first argument. * configure.ac (HAVE_GUILE_JSON): New conditional. * Makefile.am (MODULES): Add new files and remove 'guix/snix.scm'. (SCM_TESTS): Add 'tests/pypi.scm' if guile-json is installed.
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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)
+ (_ #f)))
+
+(define (url-fetch url file-name)
+ "Save the contents of URL to FILE-NAME."
+ (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."
+ (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."
+ (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 dashes are replaced with
+underscores."
+ (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 ,(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))
+ 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."
+ (let ((package (pypi-fetch package-name)))
+ (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))))