add reverse sort order option, toggle

config.go

@@ -18,6 +18,15 @@ func updateConfig(k, v string) {
 	configChan <- ConfigMsg{k, v}
 }
 
+// Toggle a boolean option
+func (c Config) toggle(k string) {
+	if c[k] == "0" {
+		c[k] = "1"
+	} else {
+		c[k] = "0"
+	}
+}
+
 func NewDefaultConfig() Config {
 	docker := os.Getenv("DOCKER_HOST")
 	if docker == "" {
@@ -26,6 +35,7 @@ func NewDefaultConfig() Config {
 	config := Config{
 		"dockerHost":   docker,
 		"sortField":    "id",
+		"sortReverse":  "0",
 		"enableHeader": "0",
 	}
 	go func() {

grid.go

@@ -145,11 +145,14 @@ func Display(g *Grid) bool {
 		menu = HelpMenu
 		ui.StopLoop()
 	})
-	ui.Handle("/sys/kbd/s", func(ui.Event) {
+	ui.Handle("/sys/kbd/q", func(ui.Event) {
-		menu = SortMenu
 		ui.StopLoop()
 	})
-	ui.Handle("/sys/kbd/q", func(ui.Event) {
+	ui.Handle("/sys/kbd/r", func(ui.Event) {
+		GlobalConfig.toggle("sortReversed")
+	})
+	ui.Handle("/sys/kbd/s", func(ui.Event) {
+		menu = SortMenu
 		ui.StopLoop()
 	})
 	ui.Handle("/timer/1s", func(e ui.Event) {

menus.go

@@ -8,6 +8,7 @@ import (
 var helpDialog = []string{
 	"[h] - open this help dialog",
 	"[s] - select container sort field",
+	"[r] - reverse container sort order",
 	"[q] - exit ctop",
 }
 

sort.go

@@ -30,6 +30,9 @@ func (a Containers) Len() int      { return len(a) }
 func (a Containers) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
 func (a Containers) Less(i, j int) bool {
 	f := Sorters[GlobalConfig["sortField"]]
+	if GlobalConfig["sortReversed"] == "1" {
+		return f(a[j], a[i])
+	}
 	return f(a[i], a[j])
 }