Fix Battery widget panic (#100)

src/widgets/battery.go

@@ -8,38 +8,30 @@ import (
 	"sync"
 	"time"
 
-	ui "github.com/cjbassi/gotop/src/termui"
 	"github.com/distatus/battery"
+
+	ui "github.com/cjbassi/gotop/src/termui"
 )
 
 type Batt struct {
 	*ui.LineGraph
-	Count    int // number of batteries
 	interval time.Duration
 }
 
 func NewBatt(renderLock *sync.RWMutex, horizontalScale int) *Batt {
-	batts, err := battery.GetAll()
 	self := &Batt{
 		LineGraph: ui.NewLineGraph(),
-		Count:     len(batts),
 		interval:  time.Minute,
 	}
-	self.Title = "Battery Status"
+	self.Title = " Battery Status "
 	self.HorizontalScale = horizontalScale
-	if err != nil {
-		log.Printf("failed to get battery info from system: %v", err)
-	}
-	for i, b := range batts {
-		pc := math.Abs(b.Current/b.Full) * 100.0
-		self.Data[mkId(i)] = []float64{pc}
-	}
 
+	// intentional duplicate
+	self.update()
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			renderLock.RLock()
 			self.update()
 			renderLock.RUnlock()
@@ -57,6 +49,7 @@ func (self *Batt) update() {
 	batts, err := battery.GetAll()
 	if err != nil {
 		log.Printf("failed to get battery info from system: %v", err)
+		return
 	}
 	for i, b := range batts {
 		n := mkId(i)

src/widgets/cpu.go

@@ -6,8 +6,9 @@ import (
 	"sync"
 	"time"
 
-	ui "github.com/cjbassi/gotop/src/termui"
 	psCPU "github.com/shirou/gopsutil/cpu"
+
+	ui "github.com/cjbassi/gotop/src/termui"
 )
 
 type CPU struct {
@@ -64,8 +65,7 @@ func NewCPU(renderLock *sync.RWMutex, interval time.Duration, horizontalScale in
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			self.update()
 		}
 	}()

src/widgets/disk.go

@@ -8,9 +8,10 @@ import (
 	"sync"
 	"time"
 
+	psDisk "github.com/shirou/gopsutil/disk"
+
 	ui "github.com/cjbassi/gotop/src/termui"
 	"github.com/cjbassi/gotop/src/utils"
-	psDisk "github.com/shirou/gopsutil/disk"
 )
 
 type Partition struct {
@@ -44,8 +45,7 @@ func NewDisk(renderLock *sync.RWMutex) *Disk {
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			renderLock.RLock()
 			self.update()
 			renderLock.RUnlock()

src/widgets/mem.go

@@ -6,9 +6,10 @@ import (
 	"sync"
 	"time"
 
+	psMem "github.com/shirou/gopsutil/mem"
+
 	ui "github.com/cjbassi/gotop/src/termui"
 	"github.com/cjbassi/gotop/src/utils"
-	psMem "github.com/shirou/gopsutil/mem"
 )
 
 type Mem struct {
@@ -29,8 +30,7 @@ func NewMem(renderLock *sync.RWMutex, interval time.Duration, horizontalScale in
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			renderLock.RLock()
 			self.update()
 			renderLock.RUnlock()

src/widgets/net.go

@@ -6,14 +6,16 @@ import (
 	"sync"
 	"time"
 
+	psNet "github.com/shirou/gopsutil/net"
+
 	ui "github.com/cjbassi/gotop/src/termui"
 	"github.com/cjbassi/gotop/src/utils"
-	psNet "github.com/shirou/gopsutil/net"
 )
 
 type Net struct {
 	*ui.Sparklines
 	interval time.Duration
+
 	// used to calculate recent network activity
 	prevRecvTotal uint64
 	prevSentTotal uint64
@@ -21,10 +23,10 @@ type Net struct {
 
 func NewNet(renderLock *sync.RWMutex) *Net {
 	recv := ui.NewSparkline()
-	recv.Data = []int{0}
+	recv.Data = []int{}
 
 	sent := ui.NewSparkline()
-	sent.Data = []int{0}
+	sent.Data = []int{}
 
 	spark := ui.NewSparklines(recv, sent)
 	self := &Net{
@@ -36,8 +38,7 @@ func NewNet(renderLock *sync.RWMutex) *Net {
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			renderLock.RLock()
 			self.update()
 			renderLock.RUnlock()

src/widgets/proc.go

@@ -65,8 +65,7 @@ func NewProc(renderLock *sync.RWMutex) *Proc {
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			renderLock.RLock()
 			self.update()
 			renderLock.RUnlock()

src/widgets/temp.go

@@ -40,8 +40,7 @@ func NewTemp(renderLock *sync.RWMutex, fahrenheit bool) *Temp {
 	self.update()
 
 	go func() {
-		ticker := time.NewTicker(self.interval)
-		for range ticker.C {
+		for range time.NewTicker(self.interval).C {
 			renderLock.RLock()
 			self.update()
 			renderLock.RUnlock()