aboutsummaryrefslogtreecommitdiff
path: root/lisp/emms-playlist-limit.el
blob: eaa918badfb52cc9e0c1347e5d00ced55e34fa85 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
;;; emms-playlist-limit.el --- Limit playlist by various info

;; Copyright (C) 2007, 2008, 2009 William Xu

;; Author: William Xu <william.xwl@gmail.com>
;; Keywords: emms, limit

;; EMMS 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, or (at your option)
;; any later version.

;; EMMS 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 EMMS; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Code:

(require 'emms-playlist-mode)

;;; User Interfaces

(defgroup emms-playlist-limit nil
  "Playlist limit module for EMMS."
  :group 'emms)

(defcustom emms-playlist-limit-hook nil
  "Hooks to run after each limit operations."
  :type 'symbol
  :group 'emms-playing-limit)

(defvar emms-playlist-limit-enabled-p nil
  "If non-nil, emms playlist limit is enabled.")

(defun emms-playlist-limit (arg)
  "Turn on emms playlist limit if ARG is positive, off otherwise."
  (interactive "p")
  (if (and arg (> arg 0))
      (progn
        (setq emms-playlist-limit-enabled-p t)
        (add-hook 'emms-playlist-source-inserted-hook
                  'emms-playlist-limit-insert))
    (setq emms-playlist-limit-enabled-p nil)
    (remove-hook 'emms-playlist-source-inserted-hook
                 'emms-playlist-limit-insert)))

;;;###autoload
(defun emms-playlist-limit-enable ()
  "Turn on emms playlist limit."
  (interactive)
  (emms-playlist-limit 1)
  (message "emms playlist limit enabled"))

;;;###autoload
(defun emms-playlist-limit-disable ()
  "Turn off emms playlist limit."
  (interactive)
  (emms-playlist-limit -1)
  (message "emms playlist limit disabled"))

;;;###autoload
(defun emms-playlist-limit-toggle ()
  "Toggle emms playlist limit."
  (interactive)
  (if emms-playlist-limit-enabled-p
      (emms-playlist-limit-disable)
    (emms-playlist-limit-enable)))

(defmacro define-emms-playlist-limit (attribute)
  "Macro for defining emms playlist limit functions."
  `(defun ,(intern (format "emms-playlist-limit-to-%s" attribute)) (regexp)
     ,(format "Limit to playlists that have %s that matches REGEXP." attribute)
     (interactive
      (list
       (let* ((curr
               (or (emms-track-get
                    (emms-playlist-track-at) (quote ,attribute))
                   (emms-track-get
                    (emms-playlist-selected-track) (quote ,attribute))))
              (attr-name ,(emms-replace-regexp-in-string
                           "info-" "" (symbol-name attribute)))
              (fmt (if curr
                       (format "Limit to %s (regexp = %s): " attr-name curr)
                     (format "Limit to %s (regexp): " attr-name))))
         (read-string fmt))))
     (when (string= regexp "")
       (setq regexp (emms-track-get (emms-playlist-track-at) (quote ,attribute))))
     (emms-playlist-limit-do (quote ,attribute) regexp)))

(define-emms-playlist-limit info-artist)
(define-emms-playlist-limit info-composer)
(define-emms-playlist-limit info-performer)
(define-emms-playlist-limit info-title)
(define-emms-playlist-limit info-album)
(define-emms-playlist-limit info-year)
(define-emms-playlist-limit info-genre)
(define-emms-playlist-limit name)

(defun emms-playlist-limit-to-all ()
  "Show all tracks again."
  (interactive)
  (emms-playlist-limit-do nil nil))

(define-key emms-playlist-mode-map (kbd "/ n") 'emms-playlist-limit-to-name)
(define-key emms-playlist-mode-map (kbd "/ a") 'emms-playlist-limit-to-info-artist)
(define-key emms-playlist-mode-map (kbd "/ c") 'emms-playlist-limit-to-info-composer)
(define-key emms-playlist-mode-map (kbd "/ p") 'emms-playlist-limit-to-info-performer)
(define-key emms-playlist-mode-map (kbd "/ t") 'emms-playlist-limit-to-info-title)
(define-key emms-playlist-mode-map (kbd "/ b") 'emms-playlist-limit-to-info-album)
(define-key emms-playlist-mode-map (kbd "/ y") 'emms-playlist-limit-to-info-year)
(define-key emms-playlist-mode-map (kbd "/ g") 'emms-playlist-limit-to-info-genre)
(define-key emms-playlist-mode-map (kbd "/ /") 'emms-playlist-limit-to-all)


;;; Low Level Functions

(defvar emms-playlist-limit-tracks nil
  "All tracks in playlist buffer(unlimited).")

(defun emms-playlist-limit-insert ()
  "Run in `emms-playlist-source-inserted-hook'."
  (with-current-emms-playlist
    (emms-playlist-ensure-playlist-buffer)
    (setq-local emms-playlist-limit-tracks
		(emms-with-widened-buffer
		 (emms-playlist-tracks-in-region (point-min)
						 (point-max))))))

;; FIXME: What happens when a user deletes some tracks,
;; `emms-playlist-limit-tracks' should be updated (a general look
;; through this code shows that it is preliminary.)

(defun emms-playlist-limit-do (name value)
  "Limit by NAME with VALUE.
e.g.,
    (emms-playlist-limit-do 'info-artist \"Jane Zhang\")

When NAME is nil, show all tracks again.

See `emms-info-mp3find-arguments' for possible options for NAME."
  (with-current-emms-playlist
    (emms-playlist-ensure-playlist-buffer)
    (let ((curr (emms-playlist-current-selected-track))
          (tracks (emms-playlist-tracks-in-region (point-min) (point-max))))
      (erase-buffer)
      (run-hooks 'emms-playlist-cleared-hook)
      (if name
          (mapc (lambda (track)
                  (let ((track-value (emms-track-get track name)))
                    (when (and track-value (string-match value track-value))
                      (emms-playlist-insert-track track))))
                tracks)
        (mapc (lambda (track)
                (emms-playlist-insert-track track))
              emms-playlist-limit-tracks))
      (let ((pos (text-property-any (point-min) (point-max)
                                    'emms-track curr)))
        (if pos
            (emms-playlist-select pos)
          (emms-playlist-first)))
      (run-hooks 'emms-playlist-limit-hook)
      (emms-playlist-mode-center-current))))


(provide 'emms-playlist-limit)

;;; emms-playlist-limit.el ends here