gocui: copy input between views

copy_view.go

package main

import (
	"fmt"
	"log"

	"github.com/jroimartin/gocui"
)

func main() {
	g, err := gocui.NewGui()
	if err != nil {
		log.Panicln(err)
	}
	defer g.Close()

	g.Cursor = true

	g.SetManagerFunc(layout)

	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
		log.Panicln(err)
	}

	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
		log.Panicln(err)
	}
}

func layout(g *gocui.Gui) error {
	if v, err := g.SetView("in", 1, 1, 31, 3); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		v.Editable = true

		if err := g.SetKeybinding("in", gocui.KeyEnter, gocui.ModNone, vcopy("out")); err != nil {
			return err
		}
		if _, err := g.SetCurrentView("in"); err != nil {
			return err
		}
	}
	if v, err := g.SetView("out", 35, 1, 65, 10); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		v.Wrap = true
		v.Autoscroll = true
	}
	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}

func vcopy(dst string) func(g *gocui.Gui, v *gocui.View) error {
	return func(g *gocui.Gui, v *gocui.View) error {
		vdst, err := g.View(dst)
		if err != nil {
			return err
		}
		fmt.Fprint(vdst, v.Buffer())

		if err := v.SetCursor(0, 0); err != nil {
			return err
		}
		if err := v.SetOrigin(0, 0); err != nil {
			return err
		}
		v.Clear()

		return nil
	}
}