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authorFederico Beffa <beffa@fbengineering.ch>2015-06-16 10:50:06 +0200
committerFederico Beffa <beffa@fbengineering.ch>2015-07-08 10:53:05 +0200
commit7f74a931ddccdb3b42558f8f8ee29b309d9231b9 (patch)
tree1804fcf24967f92cd15e4ee3c2ac13e5091bb8dd /guix/import
parent575b4b092d73403381277625794042a7b7253cfe (diff)
import: Add 'elpa' importer.
* guix/import/elpa.scm: New file. * guix/scripts/import.scm: Add "elpa" to 'importers'. * guix/scripts/import/elpa.scm: New file. * Makefile.am (MODULES): Add 'guix/import/elpa.scm' and 'guix/scripts/import/elpa.scm'. (SCM_TESTS): Add 'tests/elpa.scm'. * doc/guix.texi (Invoking guix import): Document it. * tests/elpa.scm: New file. * po/guix/POTFILES.in: Add 'guix/scripts/import/elpa.scm'.
Diffstat (limited to 'guix/import')
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diff --git a/guix/import/elpa.scm b/guix/import/elpa.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
+;;;
+;;; 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 elpa)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 rdelim)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-9)
+ #:use-module (srfi srfi-9 gnu)
+ #:use-module (srfi srfi-11)
+ #:use-module (srfi srfi-26)
+ #:use-module ((guix download) #:select (download-to-store))
+ #:use-module (guix import utils)
+ #:use-module (guix store)
+ #:use-module (guix ui)
+ #:use-module (guix hash)
+ #:use-module (guix base32)
+ #:use-module ((guix utils) #:select (call-with-temporary-output-file
+ memoize))
+ #:export (elpa->guix-package))
+
+(define (elpa-dependencies->names deps)
+ "Convert DEPS, a list of symbol/version pairs à la ELPA, to a list of
+package names as strings"
+ (match deps
+ (((names _ ...) ...)
+ (map symbol->string names))))
+
+(define emacs-standard-library?
+ (let ((libs '("emacs" "cl-lib")))
+ (lambda (lib)
+ "Return true if LIB is part of Emacs itself. The check is not
+exhaustive and only attempts to recognize a subset of packages which in the
+past were distributed separately from Emacs."
+ (member lib libs))))
+
+(define (filter-dependencies names)
+ "Remove the package names included with Emacs from the list of
+NAMES (strings)."
+ (filter emacs-standard-library? names))
+
+(define (elpa-name->package-name name)
+ "Given the NAME of an Emacs package, return the corresponding Guix name."
+ (let ((package-name-prefix "emacs-"))
+ (if (string-prefix? package-name-prefix name)
+ (string-downcase name)
+ (string-append package-name-prefix (string-downcase name)))))
+
+(define* (elpa-url #:optional (repo 'gnu))
+ "Retrun the URL of REPO."
+ (let ((elpa-archives
+ '((gnu . "http://elpa.gnu.org/packages")
+ (melpa-stable . "http://stable.melpa.org/packages")
+ (melpa . "http://melpa.org/packages"))))
+ (assq-ref elpa-archives repo)))
+
+(define* (elpa-fetch-archive #:optional (repo 'gnu))
+ "Retrive the archive with the list of packages available from REPO."
+ (let ((url (and=> (elpa-url repo)
+ (cut string-append <> "/archive-contents"))))
+ (if url
+ (call-with-downloaded-file url read)
+ (leave (_ "~A: currently not supported~%") repo))))
+
+(define (call-with-downloaded-file url proc)
+ "Fetch URL, store the content in a temporary file and call PROC with that
+file. Returns the value returned by PROC."
+ (call-with-temporary-output-file
+ (lambda (temp port)
+ (or (and (url-fetch url temp)
+ (call-with-input-file temp proc))
+ (error "download failed" url)))))
+
+(define (is-elpa-package? name elpa-pkg-spec)
+ "Return true if the string NAME corresponds to the name of the package
+defined by ELPA-PKG-SPEC, a package specification as in an archive
+'archive-contents' file."
+ (eq? (first elpa-pkg-spec) (string->symbol name)))
+
+(define* (elpa-package-info name #:optional (repo 'gnu))
+ "Extract the information about the package NAME from the package archieve of
+REPO."
+ (let* ((archive (elpa-fetch-archive repo))
+ (pkgs (match archive ((version pkg-spec ...) pkg-spec)))
+ (info (filter (cut is-elpa-package? name <>) pkgs)))
+ (if (pair? info) (first info) #f)))
+
+;; Object to store information about an ELPA package.
+(define-record-type <elpa-package>
+ (make-elpa-package name version inputs synopsis kind home-page description
+ source-url)
+ elpa-package?
+ (name elpa-package-name)
+ (version elpa-package-version)
+ (inputs elpa-package-inputs)
+ (synopsis elpa-package-synopsis)
+ (kind elpa-package-kind)
+ (home-page elpa-package-home-page)
+ (description elpa-package-description)
+ (source-url elpa-package-source-url))
+
+(set-record-type-printer! <elpa-package>
+ (lambda (package port)
+ (format port "#<elpa-package ~a-~a>"
+ (elpa-package-name package)
+ (elpa-package-version package))))
+
+(define (elpa-version->string elpa-version)
+ "Convert the package version as used in Emacs package files into a string."
+ (if (pair? elpa-version)
+ (let-values (((ms rest) (match elpa-version
+ ((ms . rest)
+ (values ms rest)))))
+ (fold (lambda (n s) (string-append s "." (number->string n)))
+ (number->string ms) rest))
+ #f))
+
+(define (package-home-page alist)
+ "Extract the package home-page from ALIST."
+ (or (assq-ref alist ':url) "unspecified"))
+
+(define (ensure-list alist)
+ "If ALIST is the symbol 'nil return the empty list. Otherwise, return ALIST."
+ (if (eq? alist 'nil)
+ '()
+ alist))
+
+(define (package-source-url kind name version repo)
+ "Return the source URL of the package described the the strings NAME and
+VERSION at REPO. KIND is either the symbol 'single or 'tar."
+ (case kind
+ ((single) (full-url repo name ".el" version))
+ ((tar) (full-url repo name ".tar" version))
+ (else
+ #f)))
+
+(define* (full-url repo name suffix #:optional (version #f))
+ "Return the full URL of the package NAME at REPO and the SUFFIX. Maybe
+include VERSION."
+ (if version
+ (string-append (elpa-url repo) "/" name "-" version suffix)
+ (string-append (elpa-url repo) "/" name suffix)))
+
+(define (fetch-package-description kind name repo)
+ "Fetch the description of package NAME of type KIND from REPO."
+ (let ((url (full-url repo name "-readme.txt")))
+ (call-with-downloaded-file url read-string)))
+
+(define* (fetch-elpa-package name #:optional (repo 'gnu))
+ "Fetch package NAME from REPO."
+ (let ((pkg (elpa-package-info name repo)))
+ (match pkg
+ ((name version reqs synopsis kind . rest)
+ (let* ((name (symbol->string name))
+ (ver (elpa-version->string version))
+ (url (package-source-url kind name ver repo)))
+ (make-elpa-package name ver
+ (ensure-list reqs) synopsis kind
+ (package-home-page (first rest))
+ (fetch-package-description kind name repo)
+ url)))
+ (_ #f))))
+
+(define* (elpa-package->sexp pkg)
+ "Return the `package' S-expression for the Emacs package PKG, a record of
+type '<elpa-package>'."
+
+ (define name (elpa-package-name pkg))
+
+ (define version (elpa-package-version pkg))
+
+ (define source-url (elpa-package-source-url pkg))
+
+ (define dependencies
+ (let* ((deps (elpa-package-inputs pkg))
+ (names (filter-dependencies (elpa-dependencies->names deps))))
+ (map (lambda (n)
+ (let ((new-n (elpa-name->package-name n)))
+ (list new-n (list 'unquote (string->symbol new-n)))))
+ names)))
+
+ (define (maybe-inputs input-type inputs)
+ (match inputs
+ (()
+ '())
+ ((inputs ...)
+ (list (list input-type
+ (list 'quasiquote inputs))))))
+
+ (let ((tarball (with-store store
+ (download-to-store store source-url))))
+ `(package
+ (name ,(elpa-name->package-name name))
+ (version ,version)
+ (source (origin
+ (method url-fetch)
+ (uri (string-append ,@(factorize-uri source-url version)))
+ (sha256
+ (base32
+ ,(if tarball
+ (bytevector->nix-base32-string (file-sha256 tarball))
+ "failed to download package")))))
+ (build-system emacs-build-system)
+ ,@(maybe-inputs 'inputs dependencies)
+ (home-page ,(elpa-package-home-page pkg))
+ (synopsis ,(elpa-package-synopsis pkg))
+ (description ,(elpa-package-description pkg))
+ (license license:gpl3+))))
+
+(define* (elpa->guix-package name #:optional (repo 'gnu))
+ "Fetch the package NAME from REPO and produce a Guix package S-expression."
+ (let ((pkg (fetch-elpa-package name repo)))
+ (and=> pkg elpa-package->sexp)))
+
+;;; elpa.scm ends here