Transforming file name labels in diff mode

[salmankhilji]

How do I hide one of the filenames within the header when invoking delta with two files on the CLI?

i.e., by default, delta displays A ⟶ B. I want to hide the ⟶ B part.

$ delta -s --hunk-header-style=omit A B

A ⟶   B
────────────────────────────────────────────────────────────────────

│  1 │A                           │    │
│    │                            │  1 │B

Not sure how to use the --file-transformation option. Here is how I tried to use it (unsuccessfully):

$ delta -s --hunk-header-style=omit --file-transformation 's/A/Z/' A B

A ⟶   B
────────────────────────────────────────────────────────────────────

│  1 │A                           │    │
│    │                            │  1 │B

[Gerst20051]

I am also trying to figure this out.

/dev/fd/12 ⟶ /dev/fd/14

This would be useful when diffing like this:

delta <(sort file1) <(sort file2)

I got it to work like this:

delta --file-style omit <(sort file1) <(sort file2)

I didn't use --hunk-header-style omit because that removes the line numbers and I want to keep the line numbers.