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Diffstat (limited to 'guix/import/cran.scm')
| -rw-r--r-- | guix/import/cran.scm | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/guix/import/cran.scm b/guix/import/cran.scm new file mode 100644 index 0000000000..8ed5e5407f --- /dev/null +++ b/guix/import/cran.scm @@ -0,0 +1,188 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net> +;;; +;;; 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 cran) + #:use-module (ice-9 match) + #:use-module (ice-9 regex) + #:use-module (srfi srfi-1) + #:use-module (sxml simple) + #:use-module (sxml match) + #:use-module (sxml xpath) + #:use-module (guix http-client) + #:use-module (guix hash) + #:use-module (guix store) + #:use-module (guix base32) + #:use-module ((guix download) #:select (download-to-store)) + #:use-module (guix import utils) + #:export (cran->guix-package)) + +;;; Commentary: +;;; +;;; Generate a package declaration template for the latest version of an R +;;; package on CRAN, using the HTML description downloaded from +;;; cran.r-project.org. +;;; +;;; Code: + +(define string->license + (match-lambda + ("AGPL-3" 'agpl3+) + ("Artistic-2.0" 'artistic2.0) + ("Apache License 2.0" 'asl2.0) + ("BSD_2_clause" 'bsd-2) + ("BSD_3_clause" 'bsd-3) + ("GPL-2" 'gpl2+) + ("GPL-3" 'gpl3+) + ("LGPL-2" 'lgpl2.0+) + ("LGPL-2.1" 'lgpl2.1+) + ("LGPL-3" 'lgpl3+) + ("MIT" 'x11) + ((x) (string->license x)) + ((lst ...) `(list ,@(map string->license lst))) + (_ #f))) + +(define (format-inputs names) + "Generate a sorted list of package inputs from a list of package NAMES." + (map (lambda (name) + (list name (list 'unquote (string->symbol name)))) + (sort names string-ci<?))) + +(define* (maybe-inputs package-inputs #:optional (type 'inputs)) + "Given a list of PACKAGE-INPUTS, tries to generate the TYPE field of a +package definition." + (match package-inputs + (() + '()) + ((package-inputs ...) + `((,type (,'quasiquote ,(format-inputs package-inputs))))))) + +(define (table-datum tree label) + "Extract the datum node following a LABEL in the sxml table TREE. Only the +first cell of a table row is considered a label cell." + ((node-pos 1) + ((sxpath `(xhtml:tr + (xhtml:td 1) ; only first cell can contain label + (equal? ,label) + ,(node-parent tree) ; go up to label cell + ,(node-parent tree) ; go up to matching row + (xhtml:td 2))) ; select second cell + tree))) + +(define %cran-url "http://cran.r-project.org/web/packages/") + +(define (cran-fetch name) + "Return an sxml representation of the CRAN page for the R package NAME, +or #f on failure. NAME is case-sensitive." + ;; This API always returns the latest release of the module. + (let ((cran-url (string-append %cran-url name))) + (false-if-exception + (xml->sxml (http-fetch cran-url) + #:trim-whitespace? #t + #:namespaces '((xhtml . "http://www.w3.org/1999/xhtml")) + #:default-entity-handler + (lambda (port name) + (case name + ((nbsp) " ") + ((ge) ">=") + ((gt) ">") + ((lt) "<") + (else + (format (current-warning-port) + "~a:~a:~a: undefined entitity: ~a\n" + cran-url (port-line port) (port-column port) + name) + (symbol->string name)))))))) + +(define (cran-sxml->sexp sxml) + "Return the `package' s-expression for a CRAN package from the SXML +representation of the package page." + (define (nodes->text nodeset) + (string-join ((sxpath '(// *text*)) nodeset) " ")) + + (define (guix-name name) + (if (string-prefix? "r-" name) + (string-downcase name) + (string-append "r-" (string-downcase name)))) + + (sxml-match-let* + (((*TOP* (xhtml:html + ,head + (xhtml:body + (xhtml:h2 ,name-and-synopsis) + (xhtml:p ,description) + ,summary + (xhtml:h4 "Downloads:") ,downloads + . ,rest))) + sxml)) + (let* ((name (match:prefix (string-match ": " name-and-synopsis))) + (synopsis (match:suffix (string-match ": " name-and-synopsis))) + (version (nodes->text (table-datum summary "Version:"))) + (license ((compose string->license nodes->text) + (table-datum summary "License:"))) + (home-page (nodes->text ((sxpath '((xhtml:a 1))) + (table-datum summary "URL:")))) + (source-url (string-append "mirror://cran/" + ;; Remove double dots, because we want an + ;; absolute path. + (regexp-substitute/global + #f "\\.\\./" + (string-join + ((sxpath '((xhtml:a 1) @ href *text*)) + (table-datum downloads + " Package source: "))) + 'pre 'post))) + (tarball (with-store store (download-to-store store source-url))) + (sysdepends (map match:substring + (list-matches + "[^ ]+" + ;; Strip off comma and parenthetical + ;; expressions. + (regexp-substitute/global + #f "(,|\\([^\\)]+\\))" + (nodes->text (table-datum summary + "SystemRequirements:")) + 'pre 'post)))) + (imports (map guix-name + ((sxpath '(// xhtml:a *text*)) + (table-datum summary "Imports:"))))) + `(package + (name ,(guix-name name)) + (version ,version) + (source (origin + (method url-fetch) + (uri (string-append ,@(factorize-uri source-url version))) + (sha256 + (base32 + ,(bytevector->nix-base32-string (file-sha256 tarball)))))) + (build-system r-build-system) + ,@(maybe-inputs sysdepends) + ,@(maybe-inputs imports 'propagated-inputs) + (home-page ,(if (string-null? home-page) + (string-append %cran-url name) + home-page)) + (synopsis ,synopsis) + ;; Use double spacing + (description ,(regexp-substitute/global #f "\\. \\b" description + 'pre ". " 'post)) + (license ,license))))) + +(define (cran->guix-package package-name) + "Fetch the metadata for PACKAGE-NAME from cran.r-project.org, and return the +`package' s-expression corresponding to that package, or #f on failure." + (let ((module-meta (cran-fetch package-name))) + (and=> module-meta cran-sxml->sexp))) |