Use H for host option short flag.

[alampros]

Allows subcommand help to display (-h).
Add program help text to show subcommand help.

Updated usage output:

$> gatsby -h

  Usage:  [command] [options]


  Commands:

    develop [options]         Start development server. Watches files and rebuilds and hot reloads if something changes
    build [options]           Build a Gatsby project.
    serve-build [options]     Serve built site.
    new [rootPath] [starter]  Create new Gatsby project.

  Options:

    -h, --help     output usage information
    -V, --version  output the version number

To show subcommand help:

    gatsby [command] -h

Subcommand usage output:

$> gatsby develop -h

  Usage: develop [options]

  Start development server. Watches files and rebuilds and hot reloads if something changes

  Options:

    -h, --help         output usage information
    -H, --host <url>   Set host. Defaults to 0.0.0.0
    -p, --port <port>  Set port. Defaults to 8000

[KyleAMathews]

Oh is -h the default for help for commander.js?

[alampros]

Yep!

[KyleAMathews]

Ok cool :-)

So since this is a breaking change it'll need to wait until the next major release which will probably be when someone (hint hint 😉) upgrades Gatsby to React 15 #236

[KyleAMathews]

React 15 support added in #252 so merging this in as well. Will release new version later.