Add SelectionOptions type and refactor GetThermostat to use them (#15)

Allows granularly controlling the contents of the [Selection](https://www.shared.ecobee.com/home/developer/api/documentation/v1/objects/Selection.shtml) parameter to GetThermostats.

ecobee/functions.go

@@ -65,10 +65,7 @@ func (c *Client) UpdateThermostat(utr UpdateThermostatRequest) error {
 	return fmt.Errorf("API error: %s", s.Status.Message)
 }
 
-func (c *Client) GetThermostat(thermostatID string) (*Thermostat, error) {
-	// TODO: Consider factoring the generation of Selection out into
-	// something else to make it more convenient to toggle the IncludeX
-	// flags?
+func (c *Client) GetThermostat(thermostatID string, opts ...SelectionOption) (*Thermostat, error) {
 	s := Selection{
 		SelectionType:  "thermostats",
 		SelectionMatch: thermostatID,
@@ -82,6 +79,11 @@ func (c *Client) GetThermostat(thermostatID string) (*Thermostat, error) {
 		IncludeSensors:         true,
 		IncludeWeather:         false,
 	}
+
+	for _, o := range opts {
+		o(s)
+	}
+
 	thermostats, err := c.GetThermostats(s)
 	if err != nil {
 		return nil, err

ecobee/options.go

@@ -0,0 +1,135 @@
+package ecobee
+
+type SelectionOption func(s Selection)
+
+func WithIncludeAlerts(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeAlerts = value
+	}
+}
+
+func WithIncludeAudio(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeAudio = value
+	}
+}
+
+func WithIncludeDevice(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeDevice = value
+	}
+}
+
+func WithIncludeElectricity(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeElectricity = value
+	}
+}
+
+func WithIncludeEquipmentStatus(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeElectricity = value
+	}
+}
+
+func WithIncludeEvents(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeEvents = value
+	}
+}
+
+func WithIncludeExtendedRuntime(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeExtendedRuntime = value
+	}
+}
+
+func WithIncludeHouseDetails(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeHouseDetails = value
+	}
+}
+
+func WithIncludeLocation(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeLocation = value
+	}
+}
+
+func WithIncludeManagement(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeManagement = value
+	}
+}
+
+func WithIncludeNotificationSettings(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeManagement = value
+	}
+}
+
+func WithIncludeOemCfg(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeOemCfg = value
+	}
+}
+
+func WithIncludePrivacy(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludePrivacy = value
+	}
+}
+
+func WithIncludeProgram(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeProgram = value
+	}
+}
+
+func WithIncludeRuntime(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeRuntime = value
+	}
+}
+
+func WithIncludeSecuritySettings(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeSecuritySettings = value
+	}
+}
+
+func WithIncludeSensors(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeSensors = value
+	}
+}
+
+func WithIncludeSettings(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeSettings = value
+	}
+}
+
+func WithIncludeTechnician(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeSettings = value
+	}
+}
+
+func WithIncludeUtility(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeUtility = value
+	}
+}
+
+func WithIncludeVersion(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeVersion = value
+	}
+}
+
+func WithIncludeWeather(value bool) SelectionOption {
+	return func(s Selection) {
+		s.IncludeWeather = value
+	}
+}