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

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

When hosts 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 installed: /usr/local/etc/bash_completion.d/hosts
Completion installed: /usr/local/share/zsh/site-functions/_hosts

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

The hosts 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 hosts completions check
Completion scripts not found.

> sudo hosts completions install
Completion script installed: /usr/share/bash-completion/completions/hosts
Completion script installed: /usr/local/share/zsh/site-functions/_hosts

> sudo hosts completions check
Exists: /usr/share/bash-completion/completions/hosts
Exists: /usr/local/share/zsh/site-functions/_hosts

> sudo hosts completions uninstall
Completion script removed: /usr/share/bash-completion/completions/hosts
Completion script removed: /usr/local/share/zsh/site-functions/_hosts

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

sudo hosts completions install --download

hosts completions will try to determine the completion script directories from your environment. If hosts 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/hosts/master/hosts-completion.bash -o /etc/bash_completion.d/hosts

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

if [[ -f /path/to/hosts-completion.bash ]]
then
  source /path/to/hosts-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/hosts/master/hosts-completion.zsh > ~/.zsh/completion/_hosts

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