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.

6 files changed, 435 insertions, 2 deletions

diff --git a/Makefile.am b/Makefile.am
index 436a003411..4dfcd06d0b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -145,6 +145,7 @@ MODULES =					\
   guix/import/cran.scm				\
   guix/import/hackage.scm			\
   guix/import/elpa.scm   			\
+  guix/import/texlive.scm   			\
   guix/scripts.scm				\
   guix/scripts/download.scm			\
   guix/scripts/perform-download.scm		\
@@ -167,6 +168,7 @@ MODULES =					\
   guix/scripts/import/nix.scm			\
   guix/scripts/import/hackage.scm		\
   guix/scripts/import/elpa.scm  		\
+  guix/scripts/import/texlive.scm  		\
   guix/scripts/environment.scm			\
   guix/scripts/publish.scm			\
   guix/scripts/edit.scm				\
@@ -303,6 +305,7 @@ SCM_TESTS =					\
   tests/hackage.scm				\
   tests/cran.scm				\
   tests/elpa.scm				\
+  tests/texlive.scm				\
   tests/store.scm				\
   tests/monads.scm				\
   tests/gexp.scm				\
diff --git a/doc/guix.texi b/doc/guix.texi
index 056059d04b..97fa1b7864 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -21,7 +21,7 @@ Copyright @copyright{} 2015, 2016 Mathieu Lirzin@*
 Copyright @copyright{} 2014 Pierre-Antoine Rault@*
 Copyright @copyright{} 2015 Taylan Ulrich Bayırlı/Kammer@*
 Copyright @copyright{} 2015, 2016, 2017 Leo Famulari@*
-Copyright @copyright{} 2015, 2016 Ricardo Wurmus@*
+Copyright @copyright{} 2015, 2016, 2017 Ricardo Wurmus@*
 Copyright @copyright{} 2016 Ben Woodcroft@*
 Copyright @copyright{} 2016 Chris Marusich@*
 Copyright @copyright{} 2016, 2017 Efraim Flashner@*
@@ -5671,6 +5671,38 @@ R package:
 guix import cran --archive=bioconductor GenomicRanges
 @end example
 
+@item texlive
+@cindex TeX Live
+@cindex CTAN
+Import metadata from @uref{http://www.ctan.org/, CTAN}, the
+comprehensive TeX archive network for TeX packages that are part of the
+@uref{https://www.tug.org/texlive/, TeX Live distribution}.
+
+Information about the package is obtained through the XML API provided
+by CTAN, while the source code is downloaded from the SVN repository of
+the Tex Live project.  This is done because the CTAN does not keep
+versioned archives.
+
+The command command below imports metadata for the @code{fontspec}
+TeX package:
+
+@example
+guix import texlive fontspec
+@end example
+
+When @code{--archive=DIRECTORY} is added, the source code is downloaded
+not from the @file{latex} sub-directory of the @file{texmf-dist/source}
+tree in the TeX Live SVN repository, but from the specified sibling
+directory under the same root.
+
+The command below imports metadata for the @code{ifxetex} package from
+CTAN while fetching the sources from the directory
+@file{texmf/source/generic}:
+
+@example
+guix import texlive --archive=generic ifxetex
+@end example
+
 @item nix
 Import metadata from a local copy of the source of the
 @uref{http://nixos.org/nixpkgs/, Nixpkgs distribution}@footnote{This
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
diff --git a/guix/scripts/import.scm b/guix/scripts/import.scm
index 203cda8049..9bba074e8c 100644
--- a/guix/scripts/import.scm
+++ b/guix/scripts/import.scm
@@ -74,7 +74,7 @@ rather than \\n."
 ;;;
 
 (define importers '("gnu" "nix" "pypi" "cpan" "hackage" "stackage" "elpa" "gem"
-                    "cran" "crate"))
+                    "cran" "crate" "texlive"))
 
 (define (resolve-importer name)
   (let ((module (resolve-interface
diff --git a/guix/scripts/import/texlive.scm b/guix/scripts/import/texlive.scm
new file mode 100644
index 0000000000..1cceee7051
--- /dev/null
+++ b/guix/scripts/import/texlive.scm
@@ -0,0 +1,101 @@
+;;; 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 scripts import texlive)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix scripts)
+  #:use-module (guix import texlive)
+  #:use-module (guix scripts import)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-37)
+  #:use-module (srfi srfi-41)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:export (guix-import-texlive))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+  '())
+
+(define (show-help)
+  (display (G_ "Usage: guix import texlive PACKAGE-NAME
+Import and convert the Texlive package for PACKAGE-NAME.\n"))
+  (display (G_ "
+  -a, --archive=ARCHIVE  specify the archive repository"))
+  (display (G_ "
+  -h, --help             display this help and exit"))
+  (display (G_ "
+  -V, --version          display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+(define %options
+  ;; Specification of the command-line options.
+  (cons* (option '(#\h "help") #f #f
+                 (lambda args
+                   (show-help)
+                   (exit 0)))
+         (option '(#\V "version") #f #f
+                 (lambda args
+                   (show-version-and-exit "guix import texlive")))
+         (option '(#\a "archive") #t #f
+                 (lambda (opt name arg result)
+                   (alist-cons 'component arg
+                               (alist-delete 'component result))))
+         %standard-import-options))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import-texlive . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold* args %options
+                (lambda (opt name arg result)
+                  (leave (G_ "~A: unrecognized option~%") name))
+                (lambda (arg result)
+                  (alist-cons 'argument arg result))
+                %default-options))
+
+  (let* ((opts (parse-options))
+         (args (filter-map (match-lambda
+                            (('argument . value)
+                             value)
+                            (_ #f))
+                           (reverse opts))))
+    (match args
+      ((package-name)
+       (let ((sexp (texlive->guix-package package-name
+                                          (or (assoc-ref opts 'component)
+                                              "latex"))))
+         (unless sexp
+           (leave (G_ "failed to download description for package '~a'~%")
+                  package-name))
+         sexp))
+      (()
+       (leave (G_ "too few arguments~%")))
+      ((many ...)
+       (leave (G_ "too many arguments~%"))))))
diff --git a/tests/texlive.scm b/tests/texlive.scm
new file mode 100644
index 0000000000..e28eda175c
--- /dev/null
+++ b/tests/texlive.scm
@@ -0,0 +1,115 @@
+;;; 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 (test-texlive)
+  #:use-module (gnu packages tex)
+  #:use-module (guix import texlive)
+  #:use-module (guix tests)
+  #:use-module (guix build utils)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-64)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 match))
+
+(test-begin "texlive")
+
+(define xml
+  "\
+<entry id=\"foo\">
+   <name>foo</name>
+   <caption>Foomatic frobnication in LuaLaTeX</caption>
+   <authorref id=\"rekado\"/>
+   <license type=\"lppl1.3\"/>
+   <version number=\"2.6a\"/>
+   <description>
+     <p>
+          Foo is a package for LuaLaTeX. It provides an interface to frobnicate gimbals
+          in a foomatic way with the LuaTeX engine.
+     </p>
+     <p>
+          The package requires the bar and golly
+          bundles for extremely special specialties.
+     </p>
+   </description>
+   <ctan path=\"/macros/latex/contrib/foo\" file=\"true\"/>
+   <texlive location=\"foo\"/>
+   <keyval key=\"topic\" value=\"tests\"/>
+  null
+</entry>")
+
+(define sxml
+  '(*TOP* (entry (@ (id "foo"))
+                 (name "foo")
+                 (caption "Foomatic frobnication in LuaLaTeX")
+                 (authorref (@ (id "rekado")))
+                 (license (@ (type "lppl1.3")))
+                 (version (@ (number "2.6a")))
+                 (description
+                  (p "\n          Foo is a package for LuaLaTeX. It provides an interface to frobnicate gimbals\n          in a foomatic way with the LuaTeX engine.\n     ")
+                  (p "\n          The package requires the bar and golly\n          bundles for extremely special specialties.\n     "))
+                 (ctan (@ (path "/macros/latex/contrib/foo") (file "true")))
+                 (texlive (@ (location "foo")))
+                 (keyval (@ (value "tests") (key "topic")))
+                 "\n  null\n")))
+
+(test-equal "fetch-sxml: returns SXML for valid XML"
+  sxml
+  (mock ((guix http-client) http-fetch
+         (lambda (url)
+           xml))
+        ((@@ (guix import texlive) fetch-sxml) "foo")))
+
+;; TODO:
+(test-assert "sxml->package"
+  ;; Replace network resources with sample data.
+  (mock ((guix build svn) svn-fetch
+         (lambda* (url revision directory
+                       #:key (svn-command "svn")
+                       (user-name #f)
+                       (password #f))
+           (mkdir-p directory)
+           (with-output-to-file (string-append directory "/foo")
+             (lambda ()
+               (display "source")))))
+        (let ((result ((@@ (guix import texlive) sxml->package) sxml)))
+          (match result
+            (('package
+               ('name "texlive-latex-foo")
+               ('version "2.6a")
+               ('source ('origin
+                          ('method 'svn-fetch)
+                          ('uri ('texlive-ref "latex" "foo"))
+                          ('sha256
+                           ('base32
+                            (? string? hash)))))
+               ('build-system 'texlive-build-system)
+               ('arguments ('quote (#:tex-directory "latex/foo")))
+               ('home-page "http://www.ctan.org/pkg/foo")
+               ('synopsis "Foomatic frobnication in LuaLaTeX")
+               ('description
+                "Foo is a package for LuaLaTeX.  It provides an interface to \
+frobnicate gimbals in a foomatic way with the LuaTeX engine.  The package \
+requires the bar and golly bundles for extremely special specialties.")
+               ('license 'lppl1.3+))
+             #t)
+            (_
+             (begin
+               (format #t "~s\n" result)
+               (pk 'fail result #f)))))))
+
+(test-end "texlive")