Allow to hide swap stats for mem plugin, fix swap calculation

config.go

@@ -23,7 +23,10 @@ type MyConfig struct {
 	// LA Plugin
 	LA bool `json:"la,omitempty"`
 
-	Mem bool `json:"mem,omitempty"`
+	Mem struct {
+		Enabled  bool `json:"enabled,omitempty"`
+		ShowSwap bool `json:"show_swap,omitempty"`
+	} `json:"mem,omitempty"`
 
 	Clock struct {
 		Enabled bool   `json:"enabled,omitempty"`

i3status-go-example.json

@@ -7,7 +7,10 @@
 "la" : true,
 
 // Memory stats
-"mem" : true,
+"mem" : {
+  "enabled": true,
+  "show_swap": false
+},
 
 // Just clock
 "clock": {

main.go

@@ -70,7 +70,7 @@ func main() {
 		syscall.SIGUSR2)
 
 	// Populate memory stats
-	if Conf.Mem {
+	if Conf.Mem.Enabled {
 		go UpdateMemStats()
 	}
 
@@ -160,9 +160,15 @@ func main() {
 				j = append(j, b)
 			}
 
-			if Conf.Mem {
+			if Conf.Mem.Enabled {
 				var b I3BarOutBlock
+
+				if Conf.Mem.ShowSwap {
 					b.FullText = fmt.Sprintf("M:%d%% SHM:%dM SW:%dM", Memory.Usedpct, Memory.Shared, Memory.Swap)
+				} else {
+					b.FullText = fmt.Sprintf("M:%d%% SHM:%dM", Memory.Usedpct, Memory.Shared)
+				}
+
 				j = append(j, b)
 			}
 

memory.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"log"
 	"time"
 
 	"github.com/shirou/gopsutil/mem"
@@ -19,15 +20,39 @@ var Memory Mem
 // UpdateMemStats parses mem info stats.
 func UpdateMemStats() {
 	for {
-		v, _ := mem.VirtualMemory()
+		v, err := mem.VirtualMemory()
 
+		if err != nil {
+			log.Printf("Unable to get memory statistics: %s", err)
+			time.Sleep(1 * time.Second)
+
+			continue
+		}
+
+		sw, err := mem.SwapMemory()
+
+		if err != nil {
+			log.Printf("Unable to get swap statistics: %s", err)
+			time.Sleep(1 * time.Second)
+
+			continue
+		}
+
+		if Conf.Mem.ShowSwap {
 			if Memory.Usedpct != int64(v.UsedPercent) || Memory.Shared != int64(v.Shared/1024/1024) ||
 				Memory.Swap != int64(v.SwapTotal-v.SwapFree) {
 				Memory.Usedpct = int64(v.UsedPercent)
 				Memory.Shared = int64(v.Shared / 1024 / 1024)
-			Memory.Swap = int64(v.SwapTotal - v.SwapFree)
+				Memory.Swap = int64(sw.Total - sw.Free)
 				UpdateReady <- true
 			}
+		} else {
+			if Memory.Usedpct != int64(v.UsedPercent) || Memory.Shared != int64(v.Shared/1024/1024) {
+				Memory.Usedpct = int64(v.UsedPercent)
+				Memory.Shared = int64(v.Shared / 1024 / 1024)
+				UpdateReady <- true
+			}
+		}
 
 		time.Sleep(3 * time.Second)
 	}