[zsh] add function to extract all attachments from mkv file

home/.zshrc.local

@@ -152,6 +152,10 @@ function urlencode() {
     python3 -c 'import urllib.parse; print(urllib.parse.quote(open(0, "rb").read()))'
 }
 
+function mkvextract-all-attachments() {
+    mkvextract $1 attachments $(mkvmerge --identify $1|grep 'Attachment ID'|sed 's/Attachment ID \([0-9]*\): .*/\1/')
+}
+
 # Audacious does not support symlinks; hack around that
 function audacious-hack() {
     (