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+;; jao-emms-lyrics.el -- simple show lyrics in emms
+
+;; Copyright (C) 2009, 2010 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sat Jul 04, 2009 13:41
+
+;; This file 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.
+
+;; This file 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/>.
+
+;;; Code:
+
+(require 'emms)
+
+(defvar jao-emms-lyrics-cache-dir "~/.emacs.d/emms-lyrics")
+
+(defun jao-emms-lyrics--filename (artist title)
+  (expand-file-name (format "%s.lyr" title)
+                    (jao-emms-lyrics--ensure-dir artist)))
+
+(defun jao-emms-lyrics--ensure-dir (artist)
+  (let ((candidate (expand-file-name artist jao-emms-lyrics-cache-dir)))
+    (unless (file-directory-p candidate)
+      (make-directory candidate t))
+    candidate))
+
+(defun jao-emms-lyrics--get-cached (artist title)
+  (let ((candidate (jao-emms-lyrics--filename artist title)))
+    (and (file-exists-p candidate)
+         (with-current-buffer (find-file-noselect candidate)
+           (prog1
+               (buffer-string)
+             (kill-buffer))))))
+
+(defun jao-emms-lyrics--cache (artist title lyrics)
+  (with-current-buffer
+      (find-file-noselect (jao-emms-lyrics--filename artist title))
+    (delete-region (point-min) (point-max))
+    (insert lyrics)
+    (save-buffer)
+    (kill-buffer)))
+
+(make-variable-buffer-local
+ (defvar jao-emms-lyrics--path nil))
+
+(defvar jao-emms-lyrics-mode-map)
+(setq jao-emms-lyrics-mode-map
+      (let ((map (make-keymap)))
+        (suppress-keymap map)
+        (define-key map [?q] 'bury-buffer)
+        (define-key map [?g] 'jao-emms-show-lyrics)
+        (define-key map [?G] 'jao-emms-show-lyrics-force)
+        (define-key map [?e] 'jao-emms-edit-lyrics)
+        map))
+
+(defvar jao-emms-font-lock-artist 'bold)
+(defvar jao-emms-font-lock-title 'bold)
+
+(defun jao-emms-lyrics-mode ()
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map jao-emms-lyrics-mode-map)
+  (setq major-mode 'jao-emms-lyrics-mode)
+  (setq mode-name "lyrics")
+  (toggle-read-only 1))
+
+(defun jao-emms-lyrics-buffer ()
+  (or (get-buffer "*Emms Lyrics*")
+      (with-current-buffer (get-buffer-create "*Emms Lyrics*")
+        (jao-emms-lyrics-mode)
+        (current-buffer))))
+
+(defun jao-emms-lyrics-track-data ()
+  (let ((track (or (emms-playlist-current-selected-track)
+                   (error "No playing track"))))
+    (cons (or (emms-track-get track 'info-artist nil)
+              (error "No artist"))
+          (or (emms-track-get track 'info-title nil)
+              (error "No artist")))))
+
+(defun jao-emms-edit-lyrics ()
+  (interactive)
+  (unless jao-emms-lyrics--path
+    (error "No track data available."))
+  (find-file-other-window jao-emms-lyrics--path))
+
+
+
+(defconst jao-emms--wiki-fmt
+  (concat"http://lyrics.wikia.com/api.php?action=lyrics&fmt=xml&func=getSong"
+         "&artist=%s&song=%s"))
+
+(defun jao-emms-show-lyrics/wiki ()
+  (interactive)
+  (let* ((a/t (jao-emms-lyrics-track-data))
+         (artist (car a/t))
+         (title (cdr a/t))
+         (buffer (jao-emms-lyrics-buffer))
+         (url (format jao-emms--wiki-fmt
+                      (url-hexify-string artist)
+                      (url-hexify-string title)))
+         (url-request-method "GET")
+         (data-buffer (url-retrieve-synchronously url))
+         (inhibit-read-only t))
+    (set-buffer data-buffer)
+    ;; (unless (re-search-forward "<pre>" nil t)
+    ;;   (error "Lyrics not found"))
+    (let ((begin (point)))
+      ;; (unless (re-search-forward "</pre>" nil t)
+      ;;   (error "Lyrics not found"))
+      (copy-to-buffer buffer begin (match-beginning 0)))
+    (with-current-buffer buffer
+      (goto-char (point-min))
+      (insert (format "♪ %s - %s\n" artist title)))
+    (pop-to-buffer buffer)))
+
+(defvar jao-emms-show-lyrics/script
+  (expand-file-name "lyricwiki.rb" (file-name-directory load-file-name)))
+
+(defun jao-emms-lyrics--download (artist title)
+  (message "Retrieving lyrics...")
+  (prog1
+      (shell-command-to-string (format "%s \"%s\" \"%s\""
+                                       jao-emms-show-lyrics/script
+                                       artist title))
+    (message nil)))
+
+(defun jao-emms-show-lyrics (&optional force)
+  (interactive "P")
+  (let* ((a/t (jao-emms-lyrics-track-data))
+         (artist (or (car a/t) ""))
+         (title (or (cdr a/t) ""))
+         (buffer (jao-emms-lyrics-buffer))
+         (cached (and (not force) (jao-emms-lyrics--get-cached artist title)))
+         (cached (and (not (zerop (length cached))) cached))
+         (lyrics (or cached (jao-emms-lyrics--download artist title)))
+         (inhibit-read-only t))
+    (with-current-buffer buffer
+      (delete-region (point-min) (point-max))
+      (insert (format "♪ %s - %s\n\n"
+                      (propertize artist 'face jao-emms-font-lock-artist)
+                      (propertize title 'face jao-emms-font-lock-title)))
+      (when lyrics
+        (insert lyrics)
+        (goto-char (point-min))
+        (when (not cached)
+          (save-excursion
+            (while (search-forward "
" nil t)
+              (replace-match "" nil t)))))
+      (when (and lyrics (not cached))
+        (jao-emms-lyrics--cache artist title lyrics))
+      (setq jao-emms-lyrics--path (jao-emms-lyrics--filename artist title)))
+    (pop-to-buffer buffer)))
+
+(defun jao-emms-show-lyrics-force ()
+  (interactive)
+  (jao-emms-show-lyrics t))
+
+
+(provide 'jao-emms-lyrics)
+;;; jao-emms-lyrics.el ends here