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| -rw-r--r-- | emms-tag-editor.el | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/emms-tag-editor.el b/emms-tag-editor.el index 7bf1bd0..4880870 100644 --- a/emms-tag-editor.el +++ b/emms-tag-editor.el @@ -359,6 +359,120 @@ changes will only take effect on the tracks in the region." (emms-track-set track 'tag-modified t) (emms-tag-editor-insert-track track)))))) +;;;###autoload +(defun emms-tag-editor-guess-tag-filename (pattern fullname) + "A pattern is a string like \"%a-%t-%y\" which stand for +the file name is constructed by artist, title, year with seperator '-'. +see `emms-tag-editor-compile-pattern' for detail about pattern syntax. +Available tags are list in `emms-tag-editor-tags'. + +if with prefix argument, the information will extract from full +name, otherwise just match in file name. + +An example to guess tag from file name, which the file directory is +the aritist and file name is the title. It can be done like: +C-u M-x emms-tag-editor-guess-tag-filename RET +%{a:[^/]+}/%{t:[^/]+}\.mp3 RET +" + (interactive + (list + (read-from-minibuffer (format "Match in %sfile name(C-h for help): " + (if current-prefix-arg "FULL " "")) + nil + (let ((map (make-sparse-keymap))) + (set-keymap-parent map minibuffer-local-map) + (define-key map "\C-h" + (lambda () + (interactive) + (with-output-to-temp-buffer "*Help*" + (princ + "A pattern is a string like \"%a-%t-%y\" which stand for +the file name is constructed by artist, title, year with seperator '-'. +see `emms-tag-editor-compile-pattern' for detail about pattern syntax. + +Available tags are: +") + (mapc (lambda (tag) + (princ (format "\t%s - %S\n" (cdr tag) (car tag)))) + emms-tag-editor-tags) + (save-excursion + (set-buffer standard-output) + (help-mode))))) + map)) + current-prefix-arg)) + (setq pattern (emms-tag-editor-compile-pattern pattern)) + (save-excursion + (save-restriction + (if (and mark-active transient-mark-mode) + (narrow-to-region (region-beginning) (region-end))) + (let* ((emms-playlist-buffer-p t) + (tracks (emms-playlist-tracks-in-region (point-min) + (point-max))) + (inhibit-read-only t) + filename) + (erase-buffer) + (dolist (track (nreverse tracks)) + (emms-track-set track 'tag-modified t) + (setq filename (emms-track-name track)) + (or fullname (setq filename (file-name-nondirectory filename))) + (when (string-match (car pattern) filename) + (mapcar (lambda (pair) + (emms-track-set track (car (rassoc (char-to-string (car pair)) emms-tag-editor-tags)) + (match-string (cdr pair) filename))) + (cdr pattern))) + (emms-tag-editor-insert-track track)))))) + +;;;###autoload +(defun emms-tag-editor-compile-pattern (pattern) + "A pattern to regexp convertor. \"%a-%{b:[a-z]+}\" will compile to +\"\\([^-]+\\)-\\([a-z]+\\)\"." + (let ((index 0) + (paren 0) + (i 0) + (len (length pattern)) + (compiled "") + registers register match + escape) + (while (< i len) + (setq c (aref pattern i) + i (1+ i)) + (cond ((= c ?\\) + (setq c (aref pattern i) + i (1+ i)) + (cond ((= c ?\() + (setq paren (1+ paren) + index (1+ index))) + ((= c ?\)) + (setq paren (1- paren)))) + (setq compiled (concat compiled "\\" (char-to-string c)))) + ((= c ?%) + (setq c (aref pattern i) + i (1+ i)) + ;; How to repressent a\{N,M\} in the pattern? + (if (= c ?{) + (if (/= (aref pattern (1+ i)) ?:) + (error "Compile error") + (setq register (aref pattern i) + match "" + i (+ i 2)) + (while (and (< i len) + (or escape (/= (aref pattern i) ?}))) + (if escape + (setq escape nil) + (if (= (aref pattern i) ?\\) + (setq escape t))) + (setq match (concat match (char-to-string (aref pattern i))) + i (1+ i))) + (setq i (1+ i))) + (setq register c + match "[^-]+")) + (setq compiled (concat compiled "\\(" match "\\)") + index (1+ index)) + (add-to-list 'registers (cons register index))) + (t (setq compiled (concat compiled (char-to-string c)))))) + (if (/= paren 0) (error "Paren not match!")) + (cons compiled registers))) + (defun emms-tag-editor-next-field (arg) "Move to the next tag field." (interactive "p") |