setup

type Component struct {
	// Key selects it on the command line: go, java, scala…
	Key string
	// Kind groups the menu. Plugins will be a second kind.
	Kind string
	Name string
	// For is who it serves, as the menu shows it.
	For string
	// Languages are the Jade language identifiers it provides a server for.
	Languages []string
	// Detect reports where it is installed.
	Detect func() (string, bool)
	// Recipes are tried in order; the first whose Needs is on the machine is
	// the one offered.
	Recipes []Recipe
	// Manual says how to install it by hand when no recipe fits.
	Manual string
	// Note is shown after installing: a prerequisite or an opt-in.
	Note string
}

type Environment struct {
	LookPath func(string) (string, error)
	Run      func(command []string, out io.Writer) error
}

type Menu struct {
	In         io.Reader
	Out        io.Writer
	Env        Environment
	Components []Component
}

type Recipe struct {
	Needs   string
	Command []string
}

type Status struct {
	Key       string   `json:"key"`
	Kind      string   `json:"kind"`
	Name      string   `json:"name"`
	For       string   `json:"for"`
	Installed bool     `json:"installed"`
	Path      string   `json:"path,omitempty"`
	Command   []string `json:"command,omitempty"`
	Manual    string   `json:"manual,omitempty"`
	Note      string   `json:"note,omitempty"`
}