Is there a way to format the file name by discnumber?

Support
1

Here is a piece of pseudo-code(I think that should help with understanding?)

discs = set()

for i in songs:
    cd.add(i.discnumber)

if len(discs)<=1:
    formatter='$num(%track%,2) - %title%'
else:
    formatter=r'Disc %discnumber%\$num(%track%,2) - %title%'

for i in songs:
    i.save(formatter)

Anyway, I want to realize
If the selected songs all have the same discnumber (or no discnumber)
Then use $num(%track%,2) - %title% formatting
If from more than one discnumber
then use Disc %discnumber%\$num(%track%,2) - %title% formatting

Is it possible to implement this logic inside mp3tag?
Or is there any api that would allow me to implement this in an external program?

2

You could try:
[%discnumber%\]$num(%track%,2) - %title%
which works for files that either have a discnumber - and for those the discnumber should be included in the path - or don't. And for those the discnumber should not be used for the path.

3

It's perfect for files that don't have a discnumber.
But some albums mark all files with discnumber 1
Maybe I can clear it out manually :thinking:

4

What does the discnumber look like for the ones with discnumber 1?
You could filter for these, e.g.:
NOT %discnumber% is "1/1"

5

There should be have 1/1.
I've also seen 01, or just 1.

image
image1086×743 83.9 KB

6

does a simple "1" mean that there are no further discs? Or is the first of a set of discs?
If you know which formats should be excluded, then you can use all these in the filter expression.

fitlers can be appended with AND or OR.

7

This is the string I use that applies Disc-Track if there is more than one disc in a set. It also works whether or not the disc is something like 2 or 2/2. It also shortens each field to a max length of 80 characters to stay within the limits of some older OS.
..\Music\$left(%albumartistsort%,80)\$left(%albumsort%,80)\$ifgreater(%totaldiscs%,1,$left(%discnumber%,1)-,)$num(%track%,2) $left(%titlesort%,80)