;;; 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
      (0 "The package '%s' not found." val)
      (1 "A single package with name '%s'." val)
      (many "%d packages with '%s' name." count val))
     (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
      (0 "The package output '%s' not found." val)
      (1 "A single package output with name '%s'." val)
      (many "%d package outputs with '%s' name." count val))
     (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-diff
      (0 ,(lambda (profile entries vals)
            (message
             (concat "No additional packages in generation %d "
                     "comparing with generation %d of profile '%s'.")
             (car vals) (cadr vals) profile)))
      (1 ,(lambda (profile entries vals)
            (message
             (concat "A single additional package output in generation %d "
                     "comparing with generation %d of profile '%s'.")
             (car vals) (cadr vals) profile)))
      (many ,(lambda (profile entries vals)
               (message
                (concat "%d additional package outputs in generation %d "
                        "comparing with generation %d of profile '%s'.")
                (length entries) (car vals) (cadr vals) 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
      (0 "Generations not found.")
      (1 ,(lambda (profile entries vals)
            (let ((beg (guix-get-time-string (car vals)))
                  (end (guix-get-time-string (cadr vals))))
              (message (concat "A single generation of profile '%s' "
                               "matching time period '%s'/'%s'.")
                       profile beg end))))
      (many ,(lambda (profile entries vals)
               (let ((beg (guix-get-time-string (car vals)))
                     (end (guix-get-time-string (cadr vals))))
                 (message (concat "%d generations of profile '%s' "
                                  "matching time period '%s'/'%s'.")
                          (length entries) profile beg end))))))))

(defun guix-result-message (profile entries entry-type
                            search-type search-vals)
  "Display an appropriate message after displaying ENTRIES."
  (let* ((count (length entries))
         (count-key (if (> count 1) 'many count))
         (msg-spec (guix-get-key-val guix-messages
                                     entry-type search-type count-key))
         (fun-or-msg (car msg-spec)))
    (if (functionp fun-or-msg)
        (funcall fun-or-msg profile entries search-vals)
      (let ((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 fun-or-msg args)))))

(provide 'guix-messages)

;;; guix-messages.el ends here