branch: externals/listen
commit b2d0b92bd34c165c7a8789e055512df671c343c1
Author: Adam Porter <[email protected]>
Commit: Adam Porter <[email protected]>
Add: (listen-track-metadata-get)
Not used anywhere yet, but makes sense.
---
listen-lib.el | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/listen-lib.el b/listen-lib.el
index a63c708424..9dc14e087a 100644
--- a/listen-lib.el
+++ b/listen-lib.el
@@ -58,6 +58,24 @@
;; NOTE: All of the metadata values are stored as strings, except for
duration.
filename artist title album number genre (duration 0) date rating etc
metadata)
+(defun listen-track-metadata-get (key track)
+ "Return value of KEY in TRACK's metadata.
+If KEY appears in metadata multiple times (as multiple instances
+of the key, or as a single instance with null-separated values),
+return a list of values; otherwise return the sole value."
+ ;; Don't use the null character directly, because it makes Git think it's a
binary file.
+ (cl-macrolet ((null-byte-string () (char-to-string #x0)))
+ (let ((values (cl-loop for (k . v) in (listen-track-metadata track)
+ when (equal k key)
+ collect v)))
+ (pcase (length values)
+ (0 nil)
+ (1 (let ((values (split-string (car values) (null-byte-string))))
+ (pcase-exhaustive (length values)
+ (1 (car values))
+ (_ values))))
+ (_ values)))))
+
;;;; Variables
(defvar listen-player nil)
