Merge branch 'master' into core-updates

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+;;; guix.el --- Interface for GNU Guix package manager
+
+;; Copyright © 2014 Alex Kost <alezost@gmail.com>
+
+;; Package-Requires: ((geiser "0.3"))
+;; Keywords: tools
+
+;; 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 package provides an interface for searching, listing and getting
+;; information about Guix packages and generations; and for
+;; installing/upgrading/removing packages.
+
+;;; Code:
+
+(require 'guix-list)
+(require 'guix-info)
+
+(defgroup guix nil
+  "Interface for Guix package manager."
+  :prefix "guix-"
+  :group 'external)
+
+(defcustom guix-list-single-package nil
+  "If non-nil, list a package even if it is the only matching result.
+If nil, show a single package in the info buffer."
+  :type 'boolean
+  :group 'guix)
+
+(defcustom guix-show-generations-function 'guix-generation-list-get-show
+  "Default function used to display generations."
+  :type '(choice (function-item guix-generation-list-get-show)
+                 (function-item guix-generation-info-get-show))
+  :group 'guix)
+
+(defvar guix-search-params '(name synopsis description)
+  "Default list of package parameters for searching by regexp.")
+
+(defvar guix-search-history nil
+  "A history of minibuffer prompts.")
+
+(defun guix-get-show-packages (search-type &rest search-vals)
+  "Search for packages and show results.
+
+See `guix-get-entries' for the meaning of SEARCH-TYPE and
+SEARCH-VALS.
+
+Results are displayed in the list buffer, unless a single package
+is found and `guix-list-single-package' is nil."
+  (let* ((list-params (guix-package-list-get-params-for-receiving))
+         (packages (guix-get-entries 'package search-type
+                                     search-vals list-params)))
+    (if (or guix-list-single-package
+            (cdr packages))
+        (guix-package-list-set packages search-type search-vals)
+      (let ((info-params (guix-package-info-get-params-for-receiving)))
+        (unless (equal list-params info-params)
+          ;; If we don't have required info, we should receive it again
+          (setq packages (guix-get-entries 'package search-type
+                                           search-vals info-params))))
+      (guix-package-info-set packages search-type search-vals))))
+
+(defun guix-get-show-generations (search-type &rest search-vals)
+  "Search for generations and show results."
+  (apply guix-show-generations-function search-type search-vals))
+
+;;;###autoload
+(defun guix-search-by-name (name)
+  "Search for Guix packages by NAME.
+NAME is a string with name specification.  It may optionally contain
+a version number.  Examples: \"guile\", \"guile-2.0.11\"."
+  (interactive
+   (list (read-string "Package name: " nil 'guix-search-history)))
+  (guix-get-show-packages 'name name))
+
+;;;###autoload
+(defun guix-search-by-regexp (regexp &rest params)
+  "Search for Guix packages by REGEXP.
+PARAMS are package parameters that should be searched.
+If PARAMS are not specified, use `guix-search-params'."
+  (interactive
+   (list (read-string "Regexp: " nil 'guix-search-history)))
+  (or params (setq params guix-search-params))
+  (guix-get-show-packages 'regexp regexp params))
+
+;;;###autoload
+(defun guix-installed-packages ()
+  "Display information about installed Guix packages."
+  (interactive)
+  (guix-get-show-packages 'installed))
+
+;;;###autoload
+(defun guix-obsolete-packages ()
+  "Display information about obsolete Guix packages."
+  (interactive)
+  (guix-get-show-packages 'obsolete))
+
+;;;###autoload
+(defun guix-all-available-packages ()
+  "Display information about all available Guix packages."
+  (interactive)
+  (guix-get-show-packages 'all-available))
+
+;;;###autoload
+(defun guix-newest-available-packages ()
+  "Display information about the newest available Guix packages."
+  (interactive)
+  (guix-get-show-packages 'newest-available))
+
+;;;###autoload
+(defun guix-generations (&optional number)
+  "Display information about last NUMBER generations.
+If NUMBER is nil, display all generations.
+
+Generations can be displayed in a list or info buffers depending
+on `guix-show-generations-function'.
+
+Interactively, NUMBER is defined by a numeric prefix."
+  (interactive "P")
+  (if (numberp number)
+      (guix-get-show-generations 'last number)
+    (guix-get-show-generations 'all)))
+
+(provide 'guix)
+
+;;; guix.el ends here