Generate tab-autocompletion scripts for zsh, bash, fish, & powershell shells

[JoshuaBatty]

forc now supports generating completion scripts for Bash, Fish, Zsh, and PowerShell. See forc completions --help for full details, but the gist is as simple as using one of the following and then restarting your shell for the changes to take effect:

# Bash
$ forc completions --shell=bash > ~/.local/share/bash-completion/completions/forc

# Bash (macOS/Homebrew)
$ forc completions --shell=bash > $(brew --prefix)/etc/bash_completion.d/forc.bash-completion

# Fish
$ mkdir -p ~/.config/fish/completions
$ forc completions --shell=fish > ~/.config/fish/completions/forc.fish

# Zsh
$ forc completions --shell=zsh > ~/.zfunc/_forc

# PowerShell v5.0+
$ forc completions --shell=powershell >> $PROFILE.CurrentUserCurrentHost
# or
$ forc completions --shell=powershell | Out-String | Invoke-Expression

addresses the autocompletion step in #482

[mitchmindtree]

Nice, looks good! I think those docs will be super handy on helping users work out how to actually use them too :)

[adlerjohn]

Works

[JoshuaBatty]