emacs: Add 'guix-browse-license-url' command.

* emacs/guix-main.scm (%licenses): New variable.
(licenses, license-names, lookup-license, lookup-license-uri): New
procedures.
* emacs/guix-read.el (guix-license-names, guix-read-license-name): New
procedures.
* emacs/guix-license.el: New file.
(guix-lookup-license-url): New procedure.
(guix-browse-license-url): New command.
* emacs.am (ELFILES): Add new file.

1 files changed, 44 insertions, 0 deletions

diff --git a/emacs/guix-license.el b/emacs/guix-license.el
new file mode 100644
index 0000000000..940f5518e2
--- /dev/null
+++ b/emacs/guix-license.el
@@ -0,0 +1,44 @@
+;;; guix-license.el --- Licenses
+
+;; Copyright © 2016 Alex Kost <alezost@gmail.com>
+
+;; 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file provides the code to work with licenses of Guix packages.
+
+;;; Code:
+
+(require 'guix-read)
+(require 'guix-backend)
+(require 'guix-guile)
+
+(defun guix-lookup-license-url (license)
+  "Return URL of a LICENSE."
+  (or (guix-eval-read (guix-make-guile-expression
+                       'lookup-license-uri license))
+      (error "Hm, I don't know URL of '%s' license" license)))
+
+;;;###autoload
+(defun guix-browse-license-url (license)
+  "Browse URL of a LICENSE."
+  (interactive (list (guix-read-license-name)))
+  (browse-url (guix-lookup-license-url license)))
+
+(provide 'guix-license)
+
+;;; guix-license.el ends here