Using godeps to build

vendor/github.com/mitchellh/cli/command.go

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+package cli
+
+const (
+	// RunResultHelp is a value that can be returned from Run to signal
+	// to the CLI to render the help output.
+	RunResultHelp = -18511
+)
+
+// A command is a runnable sub-command of a CLI.
+type Command interface {
+	// Help should return long-form help text that includes the command-line
+	// usage, a brief few sentences explaining the function of the command,
+	// and the complete list of flags the command accepts.
+	Help() string
+
+	// Run should run the actual command with the given CLI instance and
+	// command-line arguments. It should return the exit status when it is
+	// finished.
+	//
+	// There are a handful of special exit codes this can return documented
+	// above that change behavior.
+	Run(args []string) int
+
+	// Synopsis should return a one-line, short synopsis of the command.
+	// This should be less than 50 characters ideally.
+	Synopsis() string
+}
+
+// CommandHelpTemplate is an extension of Command that also has a function
+// for returning a template for the help rather than the help itself. In
+// this scenario, both Help and HelpTemplate should be implemented.
+//
+// If CommandHelpTemplate isn't implemented, the Help is output as-is.
+type CommandHelpTemplate interface {
+	// HelpTemplate is the template in text/template format to use for
+	// displaying the Help. The keys available are:
+	//
+	//   * ".Help" - The help text itself
+	//   * ".Subcommands"
+	//
+	HelpTemplate() string
+}
+
+// CommandFactory is a type of function that is a factory for commands.
+// We need a factory because we may need to setup some state on the
+// struct that implements the command itself.
+type CommandFactory func() (Command, error)