🚀 Shell completion should complete path names for subcommands such as delta rg

[dandavison]

In zsh at least,

rg pattern my/pathprefix<TAB> completes paths. To make that convenient with delta, one can write a shell wrapper like

#!/bin/bash
rg --hidden -g '!.git/*' --json "$@" | delta

which will automatically complete paths.

However, delta rg pattern my/pathprefix<TAB> does not complete paths. To maximise utility of the delta subcommand, it would be ideal if delta shell completion (delta --generate-completion) resulted in path completion in this situation.