refactor(battery): use struct inheritance

src/segment_battery.go

@@ -7,9 +7,10 @@ import (
 )
 
 type batt struct {
-	props      *properties
-	env        environmentInfo
-	Battery    *battery.Battery
+	props *properties
+	env   environmentInfo
+
+	battery.Battery
 	Percentage int
 	Error      string
 	Icon       string
@@ -46,7 +47,6 @@ func (b *batt) enabled() bool {
 		return false
 	}
 
-	b.Battery = &battery.Battery{}
 	for _, bt := range batteries {
 		b.Battery.Current += bt.Current
 		b.Battery.Full += bt.Full
@@ -103,11 +103,9 @@ func (b *batt) enabledWhileError(err error) bool {
 	// This hack ensures we display a fully charged battery, even if
 	// that state can be incorrect. It's better to "ignore" the error
 	// than to not display the segment at all as that will confuse users.
-	b.Battery = &battery.Battery{
-		Current: 100,
-		Full:    100,
-		State:   battery.Full,
-	}
+	b.Battery.Current = 100
+	b.Battery.Full = 10
+	b.Battery.State = battery.Full
 	return true
 }
 
@@ -131,7 +129,7 @@ func (b *batt) mapMostLogicalState(currentState, newState battery.State) battery
 }
 
 func (b *batt) string() string {
-	segmentTemplate := b.props.getString(SegmentTemplate, "{{.Icon}}{{ if not .Error }}{{.Percentage}}{{ end }}{{.Error}}")
+	segmentTemplate := b.props.getString(SegmentTemplate, "{{ if not .Error }}{{.Icon}}{{.Percentage}}{{ end }}{{.Error}}")
 	template := &textTemplate{
 		Template: segmentTemplate,
 		Context:  b,

src/segment_battery_test.go

@@ -202,11 +202,14 @@ func TestGetBatteryColors(t *testing.T) {
 		},
 	}
 	for _, tc := range cases {
+		batt := &batt{
+			Percentage: tc.Percentage,
+		}
+		if tc.Battery != nil {
+			batt.Battery = *tc.Battery
+		}
 		segment := &Segment{
-			writer: &batt{
-				Percentage: tc.Percentage,
-				Battery:    tc.Battery,
-			},
+			writer: batt,
 		}
 		segment.Foreground = tc.DefaultColor
 		segment.ForegroundTemplates = tc.Templates