Installing via Homebrew with brew install xwmx/taps/nb will also install the completion scripts.

A one-time setup might be needed to enable completion for all Homebrew programs.

When nb is installed with npm, bpkg, or Make, an install hook will check the environment and attempt to install completions. If it's successful, you should see a message similar to:

Completion script installed: /usr/local/etc/bash_completion.d/nb
Completion script installed: /usr/local/share/fish/vendor_completions.d/nb.fish
Completion script installed: /usr/local/share/zsh/site-functions/_nb

If completion is working after installing through any of these methods, then you don't need to do anything else.

The nb completions subcommand can be used for installing and uninstalling completion scripts. Depending on your configuration, you might need to use sudo to install completion scripts easily:

> sudo nb completions check
Completion scripts not found.

> sudo nb completions install
Completion script installed: /usr/share/bash-completion/completions/nb
Completion script installed: /usr/local/share/fish/vendor_completions.d/nb.fish
Completion script installed: /usr/local/share/zsh/site-functions/_nb

> sudo nb completions check
Exists: /usr/share/bash-completion/completions/nb
Exists: /usr/local/share/fish/vendor_completions.d/nb.fish
Exists: /usr/local/share/zsh/site-functions/_nb

> sudo nb completions uninstall
Completion script removed: /usr/share/bash-completion/completions/nb
Completion script removed: /usr/local/share/fish/vendor_completions.d/nb.fish
Completion script removed: /usr/local/share/zsh/site-functions/_nb

If you installed nb manually by downloading just the nb script, the completion scripts won't be immediately available for nb completions install. You can try installing the completions with the --download flag, which will get the latest version from GitHub:

sudo nb completions install --download

nb completions will try to determine the completion script directories from your environment. If nb completions isn't able to install the completion scripts, you can try installing them manually.

On a current Linux OS (in a non-minimal installation), bash completion should be available.

Place the completion script in /etc/bash_completion.d/:

sudo curl -L https://raw.githubusercontent.com/xwmx/nb/master/etc/nb-completion.bash -o etc/bash_completion.d/nb

If you aren't installing with homebrew, source the completion script in .bash_profile:

if [[ -f /path/to/nb-completion.bash ]]
then
  source /path/to/nb-completion.bash
fi

Place the completion script in your /path/to/zsh/completion (typically ~/.zsh/completion/):

$ mkdir -p ~/.zsh/completion
$ curl -L https://raw.githubusercontent.com/xwmx/nb/master/etc/nb-completion.zsh > ~/.zsh/completion/_nb

Include the directory in your $fpath by adding in ~/.zshrc:

fpath=(~/.zsh/completion $fpath)

Make sure compinit is loaded or do it by adding in ~/.zshrc:

autoload -Uz compinit && compinit -i

Then reload your shell:

exec $SHELL -l