Added rate; closes #5

gotop.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"os/signal"
+	"strconv"
 	"syscall"
 	"time"
 
@@ -28,7 +29,8 @@ var (
 
 	colorscheme = colorschemes.Default
 
-	minimal = false
+	minimal  = false
+	interval = time.Second
 
 	cpu  *w.CPU
 	mem  *w.Mem
@@ -48,6 +50,7 @@ Options:
   -c, --color <name>    Set a colorscheme.
   -h, --help            Show this screen.
   -m, --minimal         Only show CPU, Mem and Process widgets.
+  -r, --rate=RATE       Number of times per second to update CPU and Mem widgets [default: 1].
   -v, --version         Show version.
 
 Colorschemes:
@@ -63,6 +66,10 @@ Colorschemes:
 	}
 
 	minimal, _ = args["--minimal"].(bool)
+
+	rateStr, _ := args["--rate"].(string)
+	rate, _ := strconv.Atoi(rateStr)
+	interval = time.Second / time.Duration(rate)
 }
 
 func handleColorscheme(cs string) {
@@ -156,8 +163,8 @@ func main() {
 	// need to do this before initializing widgets so that they can inherit the colors
 	termuiColors()
 
-	cpu = w.NewCPU()
-	mem = w.NewMem()
+	cpu = w.NewCPU(interval)
+	mem = w.NewMem(interval)
 	proc = w.NewProc(procLoaded, keyPressed)
 	if !minimal {
 		net = w.NewNet()
@@ -194,7 +201,7 @@ func main() {
 	// all rendering done here
 	go func() {
 		ui.Render(ui.Body)
-		drawTick := time.NewTicker(time.Second)
+		drawTick := time.NewTicker(interval)
 		for {
 			select {
 			case <-helpToggled:

widgets/cpu.go

@@ -14,12 +14,12 @@ type CPU struct {
 	interval time.Duration
 }
 
-func NewCPU() *CPU {
+func NewCPU(interval time.Duration) *CPU {
 	count, _ := psCPU.Counts(false)
 	c := &CPU{
 		LineGraph: ui.NewLineGraph(),
 		count:     count,
-		interval:  time.Second,
+		interval:  interval,
 	}
 	c.Label = "CPU Usage"
 	for i := 0; i < c.count; i++ {
@@ -41,7 +41,7 @@ func NewCPU() *CPU {
 func (c *CPU) update() {
 	// psutil calculates the CPU usage over a 1 second interval, therefore it blocks for 1 second
 	// `true` makes it so psutil doesn't group CPU usage percentages
-	percent, _ := psCPU.Percent(time.Second, true)
+	percent, _ := psCPU.Percent(c.interval, true)
 	for i := 0; i < c.count; i++ {
 		key := "CPU" + strconv.Itoa(i+1)
 		c.Data[key] = append(c.Data[key], percent[i])

widgets/mem.go

@@ -12,10 +12,10 @@ type Mem struct {
 	interval time.Duration
 }
 
-func NewMem() *Mem {
+func NewMem(interval time.Duration) *Mem {
 	m := &Mem{
 		LineGraph: ui.NewLineGraph(),
-		interval:  time.Second,
+		interval:  interval,
 	}
 	m.Label = "Memory Usage"
 	m.Data["Main"] = []float64{0}