feat: sync-music: ensure valid file name on all files

sync-music/sync-music.lisp

@@ -19,7 +19,9 @@ if the file should not be copied."
     (funcall make-action-fn
              :origin origin
              :target (pathname-normalize-unicode
-                      (make-pathname :name (pathname-name origin)
+                      (make-pathname :name (ensure-valid-file-name
+                                            (pathname-name
+                                             origin))
                                      :type (string-downcase type)
                                      :defaults target)))))
 
@@ -102,10 +104,8 @@ extension equality."
                 :for output-file-name := (format nil
                                                  "~A - ~A"
                                                  track-number-str
-                                                 (ppcre:regex-replace-all
-                                                  *invalid-char-scanner*
-                                                  track-title
-                                                  "!!!"))
+                                                 (ensure-valid-file-name
+                                                  track-title))
                 :for current-action := (make-copy-flac-action
                                         :origin origin-file
                                         :target (pathname-normalize-unicode

sync-music/utils.lisp

@@ -36,6 +36,10 @@
                  :type (maybe-normalize-unicode (pathname-type p))
                  :defaults p))
 
+(defun ensure-valid-file-name (s)
+  "Make sure that STRING is a valid file name on Android/NTFS."
+  (ppcre:regex-replace-all *invalid-char-scanner* s "!!!"))
+
 (defmacro handle-overflow ((unit unit-max) (next-unit &optional next-max) &rest args)
   "Handle integer overflow from UNIT with maximum UNIT-MAX into NEXT-UNIT."
   (with-gensyms (div rem)