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guix: python: Add package-with-python2, a procedure rewriting a package

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to compile with Python 2 instead of the default Python 3.

* guix/build-system/python.scm (default-python2, package-with-explicit-python,
    package-with-python2): New procedures.
* guix/build-system/python.scm (python2-pytz, python2-babel): Use
    package-with-python2.
This commit is contained in:
Andreas Enge 2013-09-08 16:57:37 +02:00
parent b191f88ee3
commit 11bb85a10d
2 changed files with 56 additions and 9 deletions
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11
gnu/packages/python.scm
View file

@ -28,6 +28,7 @@ (define-module (gnu packages python)
#:use-module (gnu packages patchelf)
#:use-module (guix packages)
#:use-module (guix download)
#:use-module (guix utils)
#:use-module (guix build-system gnu)
#:use-module (guix build-system python)
#:use-module (guix build-system trivial))
@ -215,9 +216,7 @@ (define-public python-pytz
(license x11)))
(define-public python2-pytz
(package (inherit python-pytz)
(name "python2-pytz")
(arguments (append (package-arguments python-pytz) `(#:python ,python-2)))))
(package-with-python2 python-pytz))
(define-public python-babel
(package
@ -247,8 +246,4 @@ (define-public python-babel
(license bsd-3)))
(define-public python2-babel
(package (inherit python-babel)
(name "python2-babel")
(inputs
`(("python2-pytz" ,python2-pytz)))
(arguments (append (package-arguments python-babel) `(#:python ,python-2)))))
(package-with-python2 python-babel))

54
guix/build-system/python.scm
View file

@ -1,5 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;;
;;; This file is part of GNU Guix.
@ -25,7 +26,9 @@ (define-module (guix build-system python)
#:use-module (guix build-system)
#:use-module (guix build-system gnu)
#:use-module (ice-9 match)
#:export (python-build
#:use-module (srfi srfi-26)
#:export (package-with-python2
python-build
python-build-system))
;; Commentary:
@ -41,6 +44,55 @@ (define (default-python)
(let ((python (resolve-interface '(gnu packages python))))
(module-ref python 'python-wrapper)))
(define (default-python2)
"Return the default Python 2 package."
(let ((python (resolve-interface '(gnu packages python))))
(module-ref python 'python-2)))
(define (package-with-explicit-python p python old-prefix new-prefix)
"Create a package with the same fields as P, which is assumed to use
PYTHON-BUILD-SYSTEM, such that it is compiled with PYTHON instead. The
inputs are changed recursively accordingly. If the name of P starts with
OLD-PREFIX, this is replaced by NEW-PREFIX; otherwise, NEW-PREFIX is
prepended to the name."
(let* ((build-system (package-build-system p))
(rewrite-if-package
(lambda (content)
;; CONTENT may be a string (e.g., for patches), in which case it
;; is returned, or a package, which is rewritten with the new
;; PYTHON and NEW-PREFIX.
(if (package? content)
(package-with-explicit-python content python
old-prefix new-prefix)
content)))
(rewrite
(match-lambda
((name content . rest)
(append (list name (rewrite-if-package content)) rest)))))
(package (inherit p)
(name
(let ((name (package-name p)))
(if (eq? build-system python-build-system)
(string-append new-prefix
(if (string-prefix? old-prefix name)
(substring name (string-length old-prefix))
name))
name)))
(arguments
(let ((arguments (package-arguments p)))
(if (eq? build-system python-build-system)
(if (member #:python arguments)
(substitute-keyword-arguments arguments ((#:python p) python))
(append arguments `(#:python ,python)))
arguments)))
(inputs
(map rewrite (package-inputs p)))
(native-inputs
(map rewrite (package-native-inputs p))))))
(define package-with-python2
(cut package-with-explicit-python <> (default-python2) "python-" "python2-"))
(define* (python-build store name source inputs
#:key
(python (default-python))