chore: simplify usage logic (#11895)

util/templates/template.go

@@ -56,7 +56,7 @@ func (t *Template) Validate() error {
 		switch p.Name {
 		case ParamUsage:
 			for _, c := range p.Choice {
-				if !slices.Contains(ValidUsageChoices, c) {
+				if !slices.Contains(UsageStrings(), c) {
 					return fmt.Errorf("invalid usage choice '%s' in template %s", c, t.Template)
 				}
 			}

util/templates/types.go

@@ -9,15 +9,20 @@ import (
 	"dario.cat/mergo"
 )
 
+type Usage int
+
+//go:generate enumer -type Usage -trimprefix Usage -transform=lower
+const (
+	UsageGrid Usage = iota
+	UsagePV
+	UsageBattery
+	UsageCharge
+)
+
 const (
 	ParamUsage  = "usage"
 	ParamModbus = "modbus"
 
-	UsageChoiceGrid    = "grid"
-	UsageChoicePV      = "pv"
-	UsageChoiceBattery = "battery"
-	UsageChoiceCharge  = "charge"
-
 	HemsTypeSMA = "sma"
 
 	ModbusChoiceRS485    = "rs485"
@@ -40,18 +45,7 @@ const (
 	TemplateRenderModeInstance = "instance"
 )
 
-var (
-	ValidModbusChoices = []string{ModbusChoiceRS485, ModbusChoiceTCPIP}
-	ValidUsageChoices  = []string{UsageChoiceGrid, UsageChoicePV, UsageChoiceBattery, UsageChoiceCharge}
-)
-
-const (
-	DependencyCheckEmpty    = "empty"
-	DependencyCheckNotEmpty = "notempty"
-	DependencyCheckEqual    = "equal"
-)
-
-var ValidDependencies = []string{DependencyCheckEmpty, DependencyCheckNotEmpty, DependencyCheckEqual}
+var ValidModbusChoices = []string{ModbusChoiceRS485, ModbusChoiceTCPIP}
 
 const (
 	CapabilityISO151182      = "iso151182"       // ISO 15118-2 support

util/templates/usage_enumer.go

@@ -0,0 +1,86 @@
+// Code generated by "enumer -type Usage -trimprefix Usage -transform=lower"; DO NOT EDIT.
+
+package templates
+
+import (
+	"fmt"
+	"strings"
+)
+
+const _UsageName = "gridpvbatterycharge"
+
+var _UsageIndex = [...]uint8{0, 4, 6, 13, 19}
+
+const _UsageLowerName = "gridpvbatterycharge"
+
+func (i Usage) String() string {
+	if i < 0 || i >= Usage(len(_UsageIndex)-1) {
+		return fmt.Sprintf("Usage(%d)", i)
+	}
+	return _UsageName[_UsageIndex[i]:_UsageIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _UsageNoOp() {
+	var x [1]struct{}
+	_ = x[UsageGrid-(0)]
+	_ = x[UsagePV-(1)]
+	_ = x[UsageBattery-(2)]
+	_ = x[UsageCharge-(3)]
+}
+
+var _UsageValues = []Usage{UsageGrid, UsagePV, UsageBattery, UsageCharge}
+
+var _UsageNameToValueMap = map[string]Usage{
+	_UsageName[0:4]:        UsageGrid,
+	_UsageLowerName[0:4]:   UsageGrid,
+	_UsageName[4:6]:        UsagePV,
+	_UsageLowerName[4:6]:   UsagePV,
+	_UsageName[6:13]:       UsageBattery,
+	_UsageLowerName[6:13]:  UsageBattery,
+	_UsageName[13:19]:      UsageCharge,
+	_UsageLowerName[13:19]: UsageCharge,
+}
+
+var _UsageNames = []string{
+	_UsageName[0:4],
+	_UsageName[4:6],
+	_UsageName[6:13],
+	_UsageName[13:19],
+}
+
+// UsageString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func UsageString(s string) (Usage, error) {
+	if val, ok := _UsageNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _UsageNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Usage values", s)
+}
+
+// UsageValues returns all values of the enum
+func UsageValues() []Usage {
+	return _UsageValues
+}
+
+// UsageStrings returns a slice of all String values of the enum
+func UsageStrings() []string {
+	strs := make([]string, len(_UsageNames))
+	copy(strs, _UsageNames)
+	return strs
+}
+
+// IsAUsage returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Usage) IsAUsage() bool {
+	for _, v := range _UsageValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}