Re: Can parallel have any shell completions?

[Ole Tange]

On Sun, May 15, 2022 at 6:29 PM Wu Zhenyu <wuzy01@qq.com> wrote:>
> I found in man, there provide a zsh script:
>
> ```
>        --shell-completion shell (alpha testing)
>            Generate shell completion code for interactive shells.
>
>            Supported shells: bash zsh.
>
>            Use auto as shell to automatically detect running shell.
>
>            Activate the completion code with:
>
>              zsh% eval "$(parallel --shell-completion auto)"
>              bash$ eval "$(parallel --shell-completion auto)"
>
>            Or put this `/usr/share/zsh/site-functions/_parallel`, then 
> `compinit` to generate `~/.zcompdump`:
>
>              #compdef parallel
>
>              (( $+functions[_comp_parallel] )) ||
>                eval "$(parallel --shell-completion auto)" &&
>                _comp_parallel
> ```
>
> When we package parallel, we should install the completion script for user to 
> provide an out-of-box feeling. As an example of github-cli, this is the 
> method them did it:
>
> ```
> cat <<-EOF >./postinst
>                 #!/usr/bin/sh
>                 mkdir -p /usr/share/bash-completion/completions
>                 mkdir -p /usr/share/zsh/site-functions
>                 mkdir -p /usr/share/fish/vendor_completions.d
>                 gh completion -s bash > 
> /usr/share/bash-completion/completions/gh.bash
>                 gh completion -s zsh > /usr/share/zsh/site-functions/_gh
>                 gh completion -s fish > 
> /usr/share/fish/vendor_completions.d/gh.fish
>         EOF
>
>         cat <<-EOF >./prerm
>                 #!/usr/bin/sh
>                 rm -f /usr/share/bash-completion/completions/gh.bash
>                 rm -f /usr/share/zsh/site-functions/_gh
>                 rm -f /usr/share/fish/vendor_completions.d/gh.fish
>         EOF
> ```
>
> For parallel, `parallel --shell-completion bash > 
> /usr/share/bash-completion/completions/parallel` can work.
> However, for zsh, it cannot. So how about provide a target named 
> `install-zsh-completion` to install
>
> ```zsh
>              #compdef parallel
>
>              (( $+functions[_comp_parallel] )) ||
>                eval "$(parallel --shell-completion auto)" &&
>                _comp_parallel
> ```
>
> to `/usr/share/zsh/site-functions/_parallel`? Then let it become a `.PHONY` 
> dependence of `install`? It can help downstream to package parallel. Thanks!

I have made it part of `make install` in the git version.

/Ole