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+;; jao-lyrics.el -- simple show lyrics using glyrc
+
+;; Copyright (C) 2009, 2010, 2017, 2019, 2020 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:
+
+(defgroup jao-lyrics-faces nil "Faces"
+  :group 'faces)
+
+(defface jao-lyrics-font-lock-album '((t (:foreground "lightgoldenrod2")))
+  "Album name in lyrics."
+  :group 'jao-lyrics-faces)
+
+(defface jao-lyrics-font-lock-title '((t (:foreground "dodgerblue2")))
+  "Track title in lyrics."
+  :group 'jao-lyrics-faces)
+
+(defface jao-lyrics-font-lock-artist '((t (:foreground "dodgerblue3")))
+  "Artist name in lyrics."
+  :group 'jao-lyrics-faces)
+
+(defvar jao-lyrics-cache-dir "~/.lyrics")
+
+(defun jao-lyrics--filename (artist title)
+  (expand-file-name (format "%s - %s.txt" artist title)
+                    jao-lyrics-cache-dir))
+
+(defun jao-lyrics--get-cached (artist title)
+  (let ((candidate (jao-lyrics--filename artist title)))
+    (and (file-exists-p candidate)
+         (with-current-buffer (find-file-noselect candidate)
+           (prog1
+               (buffer-string)
+             (kill-buffer))))))
+
+(defun jao-lyrics--cache (artist title lyrics)
+  (with-current-buffer
+      (find-file-noselect (jao-lyrics--filename artist title))
+    (delete-region (point-min) (point-max))
+    (insert lyrics)
+    (save-buffer)
+    (kill-buffer)))
+
+(make-variable-buffer-local
+ (defvar jao-lyrics--path nil))
+
+(defvar jao-lyrics-mode-map)
+(setq jao-lyrics-mode-map
+      (let ((map (make-keymap)))
+        (suppress-keymap map)
+        (define-key map [?q] 'bury-buffer)
+        (define-key map [?g] 'jao-show-lyrics)
+        (define-key map [?G] (lambda () (interactive) (jao-show-lyrics t)))
+        (define-key map [?e] 'jao-edit-lyrics)
+        map))
+
+(defun jao-lyrics-mode ()
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map jao-lyrics-mode-map)
+  (setq major-mode 'jao-lyrics-mode)
+  (setq mode-name "lyrics")
+  (toggle-read-only 1))
+
+(defun jao-lyrics-buffer ()
+  (or (get-buffer "*Lyrics*")
+      (with-current-buffer (get-buffer-create "*Lyrics*")
+        (jao-lyrics-mode)
+        (current-buffer))))
+
+(defun jao-edit-lyrics ()
+  (interactive)
+  (unless jao-lyrics--path
+    (error "No track data available."))
+  (find-file-other-window jao-lyrics--path))
+
+
+
+(defun jao-lyrics--clean-download (fn)
+  (with-current-buffer (find-file-noselect fn)
+    (goto-char (point-min))
+    (when (re-search-forward
+           "^\\(CreditsWritten by:\\|External linksNominate\\)" nil t)
+      (beginning-of-line)
+      (kill-region (point) (point-max)))
+    (replace-string "
+" "" nil (point-min) (point-max))
+    (replace-string "\\'" "'"  nil (point-min) (point-max))
+    (save-buffer)))
+
+(defun jao-lyrics--download (artist title &optional noartist)
+  (message "Retrieving lyrics...")
+  (or (executable-find "glyrc")
+      (error "glyrc not installed"))
+  (let ((fn (jao-lyrics--filename (or noartist artist) title)))
+    (shell-command-to-string (format "glyrc lyrics -n 1-8 -Y -a %s -t %s -w %s"
+                                     (shell-quote-argument artist)
+                                     (shell-quote-argument title)
+                                     (shell-quote-argument fn)))
+    (jao-lyrics--clean-download fn)
+    (prog1 (jao-lyrics--get-cached artist title) (message nil))))
+
+(defvar jao-lyrics-info-function)
+(defvar-local jao-lyrics--info-function nil)
+
+;;;###autoload
+(defun jao-show-lyrics (&optional force info-function)
+  (interactive "P")
+  (let* ((a/t (funcall (or info-function
+                           jao-lyrics--info-function
+                           jao-lyrics-info-function)))
+         (artist (car a/t))
+         (title (cdr a/t))
+         (artist (if force (read-string "Artist: " artist) artist))
+         (title (if force (read-string "Title: " title) title))
+         (buffer (jao-lyrics-buffer))
+         (cached (and (not force) (jao-lyrics--get-cached artist title)))
+         (cached (and (not (zerop (length cached))) cached))
+         (lyrics (or cached
+                     (jao-lyrics--download artist title)
+                     (jao-lyrics--download "" title artist)))
+         (inhibit-read-only t))
+    (with-current-buffer buffer
+      (when info-function
+        (setq-local jao-lyrics--info-function info-function))
+      (delete-region (point-min) (point-max))
+      (insert (format "♪ %s - %s\n\n"
+                      (propertize artist 'face 'jao-lyrics-font-lock-artist)
+                      (propertize title 'face 'jao-lyrics-font-lock-title)))
+      (when lyrics (insert lyrics))
+      (goto-char (point-min))
+      (setq jao-lyrics--path (jao-lyrics--filename artist title)))
+    (pop-to-buffer buffer)))
+
+
+(provide 'jao-lyrics)
+;;; jao-lyrics.el ends here