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+;;; guix-messages.el --- Minibuffer messages
+
+;; Copyright © 2014 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 `guix-result-message' function used to show a
+;; minibuffer message after displaying packages/generations in a
+;; list/info buffer.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'guix-utils)
+
+(defvar guix-messages
+ `((package
+ (id
+ (0 "Packages not found.")
+ (1 "")
+ (many "%d packages." count))
+ (name
+ ,(lambda (_ entries names)
+ (guix-message-packages-by-name entries 'package names)))
+ (regexp
+ (0 "No packages matching '%s'." val)
+ (1 "A single package matching '%s'." val)
+ (many "%d packages matching '%s'." count val))
+ (all-available
+ (0 "No packages are available for some reason.")
+ (1 "A single available package (that's strange).")
+ (many "%d available packages." count))
+ (newest-available
+ (0 "No packages are available for some reason.")
+ (1 "A single newest available package (that's strange).")
+ (many "%d newest available packages." count))
+ (installed
+ (0 "No packages installed in profile '%s'." profile)
+ (1 "A single package installed in profile '%s'." profile)
+ (many "%d packages installed in profile '%s'." count profile))
+ (obsolete
+ (0 "No obsolete packages in profile '%s'." profile)
+ (1 "A single obsolete package in profile '%s'." profile)
+ (many "%d obsolete packages in profile '%s'." count profile))
+ (generation
+ (0 "No packages installed in generation %d of profile '%s'."
+ val profile)
+ (1 "A single package installed in generation %d of profile '%s'."
+ val profile)
+ (many "%d packages installed in generation %d of profile '%s'."
+ count val profile)))
+
+ (output
+ (id
+ (0 "Package outputs not found.")
+ (1 "")
+ (many "%d package outputs." count))
+ (name
+ ,(lambda (_ entries names)
+ (guix-message-packages-by-name entries 'output names)))
+ (regexp
+ (0 "No package outputs matching '%s'." val)
+ (1 "A single package output matching '%s'." val)
+ (many "%d package outputs matching '%s'." count val))
+ (all-available
+ (0 "No package outputs are available for some reason.")
+ (1 "A single available package output (that's strange).")
+ (many "%d available package outputs." count))
+ (newest-available
+ (0 "No package outputs are available for some reason.")
+ (1 "A single newest available package output (that's strange).")
+ (many "%d newest available package outputs." count))
+ (installed
+ (0 "No package outputs installed in profile '%s'." profile)
+ (1 "A single package output installed in profile '%s'." profile)
+ (many "%d package outputs installed in profile '%s'." count profile))
+ (obsolete
+ (0 "No obsolete package outputs in profile '%s'." profile)
+ (1 "A single obsolete package output in profile '%s'." profile)
+ (many "%d obsolete package outputs in profile '%s'." count profile))
+ (generation
+ (0 "No package outputs installed in generation %d of profile '%s'."
+ val profile)
+ (1 "A single package output installed in generation %d of profile '%s'."
+ val profile)
+ (many "%d package outputs installed in generation %d of profile '%s'."
+ count val profile)))
+
+ (generation
+ (id
+ (0 "Generations not found.")
+ (1 "")
+ (many "%d generations." count))
+ (last
+ (0 "No generations in profile '%s'." profile)
+ (1 "The last generation of profile '%s'." profile)
+ (many "%d last generations of profile '%s'." count profile))
+ (all
+ (0 "No generations in profile '%s'." profile)
+ (1 "A single generation available in profile '%s'." profile)
+ (many "%d generations available in profile '%s'." count profile))
+ (time
+ guix-message-generations-by-time))))
+
+(defun guix-message-string-name (name)
+ "Return a quoted name string."
+ (concat "'" name "'"))
+
+(defun guix-message-string-entry-type (entry-type &optional plural)
+ "Return a string denoting an ENTRY-TYPE."
+ (cl-ecase entry-type
+ (package
+ (if plural "packages" "package"))
+ (output
+ (if plural "package outputs" "package output"))
+ (generation
+ (if plural "generations" "generation"))))
+
+(defun guix-message-string-entries (count entry-type)
+ "Return a string denoting the COUNT of ENTRY-TYPE entries."
+ (cl-case count
+ (0 (concat "No "
+ (guix-message-string-entry-type
+ entry-type 'plural)))
+ (1 (concat "A single "
+ (guix-message-string-entry-type
+ entry-type)))
+ (t (format "%d %s"
+ count
+ (guix-message-string-entry-type
+ entry-type 'plural)))))
+
+(defun guix-message-packages-by-name (entries entry-type names)
+ "Display a message for packages or outputs searched by NAMES."
+ (let* ((count (length entries))
+ (str-beg (guix-message-string-entries count entry-type))
+ (str-end (if (cdr names)
+ (concat "matching the following names: "
+ (mapconcat #'guix-message-string-name
+ names ", "))
+ (concat "with name "
+ (guix-message-string-name (car names))))))
+ (message "%s %s." str-beg str-end)))
+
+(defun guix-message-generations-by-time (profile entries times)
+ "Display a message for generations searched by TIMES."
+ (let* ((count (length entries))
+ (str-beg (guix-message-string-entries count 'generation))
+ (time-beg (guix-get-time-string (car times)))
+ (time-end (guix-get-time-string (cadr times))))
+ (message (concat "%s of profile '%s'\n"
+ "matching time period '%s' - '%s'.")
+ str-beg profile time-beg time-end)))
+
+(defun guix-result-message (profile entries entry-type
+ search-type search-vals)
+ "Display an appropriate message after displaying ENTRIES."
+ (let* ((type-spec (guix-get-key-val guix-messages
+ entry-type search-type))
+ (fun-or-count-spec (car type-spec)))
+ (if (functionp fun-or-count-spec)
+ (funcall fun-or-count-spec profile entries search-vals)
+ (let* ((count (length entries))
+ (count-key (if (> count 1) 'many count))
+ (msg-spec (guix-get-key-val type-spec count-key))
+ (msg (car msg-spec))
+ (args (cdr msg-spec)))
+ (mapc (lambda (subst)
+ (setq args (cl-substitute (cdr subst) (car subst) args)))
+ `((count . ,count)
+ (val . ,(car search-vals))
+ (profile . ,profile)))
+ (apply #'message msg args)))))
+
+(provide 'guix-messages)
+
+;;; guix-messages.el ends here