Add example stdin.go

_examples/stdin.go

@@ -0,0 +1,113 @@
+// Copyright 2015 The gocui Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"runtime"
+
+	"github.com/jroimartin/gocui"
+)
+
+func main() {
+	runtime.LockOSThread()
+
+	g := gocui.NewGui()
+	if err := g.Init(); err != nil {
+		log.Fatalln(err)
+	}
+	defer g.Close()
+
+	g.SetLayout(layout)
+	if err := initKeybindings(g); err != nil {
+		log.Fatalln(err)
+	}
+	g.ShowCursor = true
+
+	err := g.MainLoop()
+	if err != nil && err != gocui.Quit {
+		log.Fatalln(err)
+	}
+}
+
+func layout(g *gocui.Gui) error {
+	maxX, _ := g.Size()
+
+	if v, err := g.SetView("legend", maxX-23, 0, maxX-1, 5); err != nil {
+		if err != gocui.ErrorUnkView {
+			return err
+		}
+		fmt.Fprintln(v, "KEYBINDINGS")
+		fmt.Fprintln(v, "↑ ↓: Seek input")
+		fmt.Fprintln(v, "A: Enable autoscroll")
+		fmt.Fprintln(v, "^C: Exit")
+	}
+
+	if v, err := g.SetView("stdin", 0, 0, 80, 35); err != nil {
+		if err != gocui.ErrorUnkView {
+			return err
+		}
+		if err := g.SetCurrentView("stdin"); err != nil {
+			return err
+		}
+		dumper := hex.Dumper(v)
+		if _, err := io.Copy(dumper, os.Stdin); err != nil {
+			return err
+		}
+		v.Wrap = true
+		v.Autoscroll = true
+		v.Editable = true
+	}
+
+	return nil
+}
+
+func initKeybindings(g *gocui.Gui) error {
+	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("stdin", 'a', gocui.ModNone, autoscroll); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("stdin", gocui.KeyArrowUp, gocui.ModNone,
+		func(g *gocui.Gui, v *gocui.View) error {
+			scrollView(v, -1)
+			return nil
+		}); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("stdin", gocui.KeyArrowDown, gocui.ModNone,
+		func(g *gocui.Gui, v *gocui.View) error {
+			scrollView(v, 1)
+			return nil
+		}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func quit(g *gocui.Gui, v *gocui.View) error {
+	return gocui.Quit
+}
+
+func autoscroll(g *gocui.Gui, v *gocui.View) error {
+	v.Autoscroll = true
+	return nil
+}
+
+func scrollView(v *gocui.View, dy int) error {
+	if v != nil {
+		v.Autoscroll = false
+		ox, oy := v.Origin()
+		if err := v.SetOrigin(ox, oy+dy); err != nil {
+			return err
+		}
+	}
+	return nil
+}