Add memory used and limit to stat

pkg/commands/container_stats.go

@@ -16,6 +16,8 @@ type RecordedStats struct {
 type DerivedStats struct {
 	CPUPercentage    float64
 	MemoryPercentage float64
+	MemoryUsed       int
+	MemoryLimit      int64
 }
 
 // ContainerStats autogenerated at https://mholt.github.io/json-to-go/

pkg/commands/docker.go

@@ -169,6 +169,8 @@ func (c *DockerCommand) CreateClientStatMonitor(container *Container) {
 			DerivedStats: DerivedStats{
 				CPUPercentage:    stats.CalculateContainerCPUPercentage(),
 				MemoryPercentage: stats.CalculateContainerMemoryUsage(),
+				MemoryUsed:       stats.MemoryStats.Usage,
+				MemoryLimit:      stats.MemoryStats.Limit,
 			},
 			RecordedAt: time.Now(),
 		}

pkg/config/app_config.go

@@ -22,6 +22,11 @@ import (
 	"github.com/jesseduffield/yaml"
 )
 
+const (
+	CPUCaption    = "CPU (%)"
+	MemoryCaption = "Memory (%)"
+)
+
 // UserConfig holds all of the user-configurable options
 type UserConfig struct {
 	// Gui is for configuring visual things like colors and whether we show or
@@ -460,12 +465,12 @@ func GetDefaultConfig() UserConfig {
 			MaxDuration: duration,
 			Graphs: []GraphConfig{
 				{
-					Caption:  "CPU (%)",
+					Caption:  CPUCaption,
 					StatPath: "DerivedStats.CPUPercentage",
 					Color:    "cyan",
 				},
 				{
-					Caption:  "Memory (%)",
+					Caption:  MemoryCaption,
 					StatPath: "DerivedStats.MemoryPercentage",
 					Color:    "green",
 				},

pkg/gui/presentation/container_stats.go

@@ -58,7 +58,8 @@ func plotGraph(container *commands.Container, spec config.GraphConfig, width int
 	container.StatsMutex.Lock()
 	defer container.StatsMutex.Unlock()
 
-	data := make([]float64, len(container.StatHistory))
+	dataLength := len(container.StatHistory)
+	data := make([]float64, dataLength)
 
 	for i, stats := range container.StatHistory {
 		value, err := lookup.LookupString(stats, spec.StatPath)
@@ -88,12 +89,27 @@ func plotGraph(container *commands.Container, spec config.GraphConfig, width int
 		height = spec.Height
 	}
 
-	caption := fmt.Sprintf(
-		"%s: %0.2f (%v)",
-		spec.Caption,
-		data[len(data)-1],
-		time.Since(container.StatHistory[0].RecordedAt).Round(time.Second),
-	)
+	memoryUsed := utils.FormatDecimalBytes(container.StatHistory[dataLength-1].DerivedStats.MemoryUsed)
+	memoryLimit := utils.FormatDecimalBytes(int(container.StatHistory[dataLength-1].DerivedStats.MemoryLimit))
+	var caption string
+	switch spec.Caption {
+	case config.CPUCaption:
+		caption = fmt.Sprintf(
+			"%s: %0.2f (%v)",
+			spec.Caption,
+			data[dataLength-1],
+			time.Since(container.StatHistory[0].RecordedAt).Round(time.Second),
+		)
+	case config.MemoryCaption:
+		caption = fmt.Sprintf(
+			"%s: %s / %s (%0.2f) (%v)",
+			spec.Caption,
+			memoryUsed,
+			memoryLimit,
+			data[dataLength-1],
+			time.Since(container.StatHistory[0].RecordedAt).Round(time.Second),
+		)
+	}
 
 	return asciigraph.Plot(
 		data,