Feature request: bash completion

It would be amazing if pipx had bash completion, so that users could do pipx up<tab> packag<tab> and stuff.

This would need two things:

1. a bash-completion plugin that defines the possible completions
2. a way for users to install it

Speaking of (2), I like the way rustup does it: the user is encouraged to run

mkdir -p ~/.local/share/bash-completion/completions
rustup completions bash > ~/.local/share/bash-completion/completions/rustup

So I suggest a similar pipx completions bash, maybe with an extra step (pipx completions bash --install) to automate the installation so the user doesn’t have to mkdir and redirect manually.

(The bash on the command line is because different shells have different syntax for user-defined completions.)

[cs01]

argcomplete actually works well, so I created a PR https://github.com/pipxproject/pipx/pull/182.

[cs01]

This is available in master now. Instructions can be seen by running pipx completions. It’s also available to test in the pre-release channel.

python3 -m pip install --user --pre --no-cache-dir -U pipx