add: wait command

cmd_wait.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/shu-go/gli"
+)
+
+type waitCmd struct {
+	_ struct{} `help:"[--wait] {Title}"`
+
+	Closed    bool
+	Intervals gli.Duration `cli:"intervals,i=DURATION" default:"1s"`
+}
+
+func (c waitCmd) Run(args []string) error {
+	if len(args) != 1 {
+		return errors.New("not one target")
+	}
+
+	an := ancestors()
+	t := strings.ToLower(args[0])
+
+	for {
+		wins, err := listAllWindows()
+		if err != nil {
+			return err
+		}
+
+		win := findFirstTarget(t, wins, an)
+		if c.Closed {
+			if win == nil {
+				break
+			}
+		} else {
+			if win != nil {
+				break
+			}
+		}
+
+		time.Sleep(c.Intervals.Duration())
+	}
+
+	return nil
+}

vvin.go

@@ -33,6 +33,7 @@ type globalCmd struct {
 	Resize   resizeCmd  `cli:"resize,move,mv" help:"resize/move"`
 	Alpha    alphaCmd   `cli:"alpha"   help:"set alpha 0%(transparent) - 100%(opaque)"`
 	Topmost  topmostCmd `cli:"topmost" help:"set always on top/restore"`
+	Wait     waitCmd    `cli:"wait"`
 
 	targetHandle syscall.Handle