Add --max-history option

config.go

@@ -45,6 +45,7 @@ type general struct {
 	noTitle      bool
 	pty          bool
 	unfold       bool
+	maxHistory   int
 }
 
 type theme struct {
@@ -86,6 +87,7 @@ func newConfig(v *viper.Viper, args []string) (*config, error) {
 	flagSet.String("shell", "", "shell (default \"sh\")")
 	flagSet.String("shell-options", "", "additional shell options")
 	flagSet.Bool("unfold", false, "unfold")
+	flagSet.Int("max-history", 1000, "maximum history length (experimental)")
 	flagSet.Bool("pty", false, "run on pty (experimental)")
 
 	flagSet.SetInterspersed(false)
@@ -151,14 +153,19 @@ func newConfig(v *viper.Viper, args []string) (*config, error) {
 		return nil, err
 	}
 
+	if err := v.BindPFlag("general.max_history", flagSet.Lookup("max-history")); err != nil {
+		return nil, err
+	}
+
 	conf.general.debug = v.GetBool("general.debug")
 	conf.general.shell = v.GetString("general.shell")
 	conf.general.shellOptions = v.GetString("general.shell_options")
-	conf.general.bell, _ = flagSet.GetBool("bell")
-	conf.general.differences, _ = flagSet.GetBool("differences")
-	conf.general.noTitle, _ = flagSet.GetBool("no-title")
+	conf.general.bell = v.GetBool("general.bell")
+	conf.general.differences = v.GetBool("general.differences")
+	conf.general.noTitle = v.GetBool("general.no_title")
 	conf.general.unfold = v.GetBool("general.unfold")
 	conf.general.pty = v.GetBool("general.pty")
+	conf.general.maxHistory = v.GetInt("general.max_history")
 
 	v.SetDefault("color.border", "gray")
 	v.SetDefault("color.title", "gray")

config_test.go

@@ -29,6 +29,7 @@ func Test_newConfig(t *testing.T) {
 			differences:  false,
 			noTitle:      false,
 			debug:        false,
+			maxHistory:   1000,
 		},
 		theme: theme{
 			Theme: tview.Theme{

main.go

@@ -82,6 +82,7 @@ Options:
   --shell-options            additional shell options
   --unfold                   unfold command result
   --pty                      run on pty (experimental, not for Windows)
+  --max-history              max history length, 0 is infinite (experimental, default "1000")
 
  -h, --help     display this help and exit
  -v, --version  output version information and exit`)

run.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package main

run_windows.go

@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package main

viddy.go

@@ -72,6 +72,7 @@ type Viddy struct {
 	isEditQuery      bool
 	unfold           bool
 	pty              bool
+	maxHistory       int
 
 	query string
 
@@ -124,6 +125,7 @@ func NewViddy(conf *config) *Viddy {
 		finishedQueue: make(chan int64),
 		diffQueue:     make(chan int64, 100),
 
+		maxHistory: conf.general.maxHistory,
 		isRingBell: conf.general.bell,
 		isShowDiff: conf.general.differences,
 		isNoTitle:  conf.general.noTitle,
@@ -276,6 +278,19 @@ func (v *Viddy) queueHandler() {
 
 				v.Lock()
 				v.idList = append(v.idList, id)
+				rc := v.historyView.GetRowCount()
+
+				if !v.isTimeMachine && v.maxHistory > 0 && rc > v.maxHistory {
+					count := rc - v.maxHistory
+					ids := v.idList[:count]
+
+					for i, id := range ids {
+						v.snapshots.Delete(id)
+						delete(v.historyRows, id)
+						v.historyView.RemoveRow(rc - 1 - i)
+					}
+				}
+
 				v.Unlock()
 
 				if !v.isTimeMachine {