guix: Add texlive importer.

* guix/import/texlive.scm: New file.
* guix/scripts/import/texlive.scm: New file.
* Makefile.am (MODULES): Add them.
* tests/texlive.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* guix/scripts/import.scm (importers): Add texlive importer.
* doc/guix.texi (Invoking guix import): Document it.

1 files changed, 182 insertions, 0 deletions

diff --git a/guix/import/texlive.scm b/guix/import/texlive.scm
new file mode 100644
index 0000000000..d4c3714364
--- /dev/null
+++ b/guix/import/texlive.scm
@@ -0,0 +1,182 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 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 texlive)
+  #:use-module (ice-9 match)
+  #:use-module (sxml simple)
+  #:use-module (sxml xpath)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (web uri)
+  #:use-module (guix http-client)
+  #:use-module (guix hash)
+  #:use-module (guix memoization)
+  #:use-module (guix store)
+  #:use-module (guix base32)
+  #:use-module (guix serialization)
+  #:use-module (guix svn-download)
+  #:use-module (guix import utils)
+  #:use-module (guix utils)
+  #:use-module (guix upstream)
+  #:use-module (guix packages)
+  #:use-module (gnu packages)
+  #:use-module (guix build-system texlive)
+  #:export (texlive->guix-package))
+
+;;; Commentary:
+;;;
+;;; Generate a package declaration template for the latest version of a
+;;; package on CTAN, using the XML output produced by the XML API to the CTAN
+;;; database at http://www.ctan.org/xml/1.2/
+;;;
+;;; Instead of taking the packages from CTAN, however, we fetch the sources
+;;; from the SVN repository of the Texlive project.  We do this because CTAN
+;;; only keeps a single version of each package whereas we can access any
+;;; version via SVN.  Unfortunately, this means that the importer is really
+;;; just a Texlive importer, not a generic CTAN importer.
+;;;
+;;; Code:
+
+(define string->license
+  (match-lambda
+    ("artistic2" 'gpl3+)
+    ("gpl" 'gpl3+)
+    ("gpl1" 'gpl1)
+    ("gpl1+" 'gpl1+)
+    ("gpl2" 'gpl2)
+    ("gpl2+" 'gpl2+)
+    ("gpl3" 'gpl3)
+    ("gpl3+" 'gpl3+)
+    ("lgpl2.1" 'lgpl2.1)
+    ("lgpl3" 'lgpl3)
+    ("knuth" 'knuth)
+    ("pd" 'public-domain)
+    ("bsd2" 'bsd-2)
+    ("bsd3" 'bsd-3)
+    ("bsd4" 'bsd-4)
+    ("opl" 'opl1.0+)
+    ("ofl" 'silofl1.1)
+    ("lppl" 'lppl)
+    ("lppl1" 'lppl1.0+) ; usually means "or later"
+    ("lppl1.2" 'lppl1.2+) ; usually means "or later"
+    ("lppl1.3" 'lppl1.3+) ; usually means "or later"
+    ("lppl1.3a" 'lppl1.3a)
+    ("lppl1.3b" 'lppl1.3b)
+    ("lppl1.3c" 'lppl1.3c)
+    ("cc-by-2" 'cc-by-2.0)
+    ("cc-by-3" 'cc-by-3.0)
+    ("cc-by-sa-2" 'cc-by-sa2.0)
+    ("cc-by-sa-3" 'cc-by-sa3.0)
+    ("mit" 'expat)
+    ("fdl" 'fdl1.3+)
+    ("gfl" 'gfl1.0)
+
+    ;; These are known non-free licenses
+    ("noinfo" 'unknown)
+    ("nosell" 'non-free)
+    ("shareware" 'non-free)
+    ("nosource" 'non-free)
+    ("nocommercial" 'non-free)
+    ("cc-by-nc-nd-1" 'non-free)
+    ("cc-by-nc-nd-2" 'non-free)
+    ("cc-by-nc-nd-2.5" 'non-free)
+    ("cc-by-nc-nd-3" 'non-free)
+    ("cc-by-nc-nd-4" 'non-free)
+    ((x) (string->license x))
+    ((lst ...) `(list ,@(map string->license lst)))
+    (_ #f)))
+
+(define (fetch-sxml name)
+  "Return an sxml representation of the package information contained in the
+XML description of the CTAN package or #f in case of failure."
+  ;; This API always returns the latest release of the module.
+  (let ((url (string-append "http://www.ctan.org/xml/1.2/pkg/" name)))
+    (guard (c ((http-get-error? c)
+               (format (current-error-port)
+                       "error: failed to retrieve package information \
+from ~s: ~a (~s)~%"
+                       (uri->string (http-get-error-uri c))
+                       (http-get-error-code c)
+                       (http-get-error-reason c))
+               #f))
+      (xml->sxml (http-fetch url)
+                 #:trim-whitespace? #t))))
+
+(define (guix-name component name)
+  "Return a Guix package name for a given Texlive package NAME."
+  (string-append "texlive-" component "-"
+                 (string-map (match-lambda
+                               (#\_ #\-)
+                               (#\. #\-)
+                               (chr (char-downcase chr)))
+                             name)))
+
+(define* (sxml->package sxml #:optional (component "latex"))
+  "Return the `package' s-expression for a Texlive package from the SXML
+expression describing it."
+  (define (sxml-value path)
+    (match ((sxpath path) sxml)
+      (() #f)
+      ((val) val)))
+  (with-store store
+    (let* ((id         (sxml-value '(entry @ id *text*)))
+           (synopsis   (sxml-value '(entry caption *text*)))
+           (version    (or (sxml-value '(entry version @ number *text*))
+                           (sxml-value '(entry version @ date *text*))))
+           (license    (string->license (sxml-value '(entry license @ type *text*))))
+           (home-page  (string-append "http://www.ctan.org/pkg/" id))
+           (ref        (texlive-ref component id))
+           (checkout   (download-svn-to-store store ref)))
+      `(package
+         (name ,(guix-name component id))
+         (version ,version)
+         (source (origin
+                   (method svn-fetch)
+                   (uri (texlive-ref ,component ,id))
+                   (sha256
+                    (base32
+                     ,(bytevector->nix-base32-string
+                       (let-values (((port get-hash) (open-sha256-port)))
+                         (write-file checkout port)
+                         (force-output port)
+                         (get-hash)))))))
+         (build-system texlive-build-system)
+         (arguments ,`(,'quote (#:tex-directory ,(string-join (list component id) "/"))))
+         (home-page ,home-page)
+         (synopsis ,synopsis)
+         (description ,(string-trim-both
+                        (string-join
+                         (map string-trim-both
+                              (string-split
+                               (beautify-description
+                                (sxml->string (or (sxml-value '(entry description))
+                                                  '())))
+                               #\newline)))))
+         (license ,license)))))
+
+(define texlive->guix-package
+  (memoize
+   (lambda* (package-name #:optional (component "latex"))
+     "Fetch the metadata for PACKAGE-NAME from REPO and return the `package'
+s-expression corresponding to that package, or #f on failure."
+     (and=> (fetch-sxml package-name)
+            (cut sxml->package <> component)))))
+
+;;; ctan.scm ends here