postuninstall hook for tools

[reitzig]

I've taken to installing shell completions through postinstall hooks, which goes something like this:

[tools.chezmoi]
version = "latest"
postinstall = 'chezmoi completion fish > "$FISH_COMPLETION_DIR/chezmoi.fish"'

How to ever remove them again, though?

I'm thinking something like

postuninstall = 'rm -f "$FISH_COMPLETION_DIR/chezmoi.fish"'

What I'm not clear about is how to handle multiple installed versions of the same tool. With the postinstall hook as above, the last installed version would win out for the completion (can't be helped), but we wouldn't want to remove the completion as long as at least one version remains. 🤔

Also, I guess there's a can of worms when thinking about how to handle hooks included in multiple mise.toml -- which would trigger? (I don't know, but there's certainly a way it works for the existing hooks.)