| // Copyright 2014 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 ( |
| "fmt" |
| "log" |
| "sync" |
| "time" |
| |
| "github.com/jroimartin/gocui" |
| ) |
| |
| const NumGoroutines = 10 |
| |
| var ( |
| done = make(chan bool) |
| wg sync.WaitGroup |
| |
| mu sync.Mutex // protects ctr |
| ctr = 0 |
| ) |
| |
| func main() { |
| g := gocui.NewGui() |
| if err := g.Init(); err != nil { |
| log.Panicln(err) |
| } |
| defer g.Close() |
| |
| g.SetLayout(layout) |
| if err := keybindings(g); err != nil { |
| log.Panicln(err) |
| } |
| |
| for i := 0; i < NumGoroutines; i++ { |
| wg.Add(1) |
| go counter(g) |
| } |
| |
| if err := g.MainLoop(); err != nil && err != gocui.ErrQuit { |
| log.Panicln(err) |
| } |
| |
| wg.Wait() |
| } |
| |
| func layout(g *gocui.Gui) error { |
| if v, err := g.SetView("ctr", 2, 2, 12, 4); err != nil { |
| if err != gocui.ErrUnknownView { |
| return err |
| } |
| fmt.Fprintln(v, "0") |
| } |
| return nil |
| } |
| |
| func keybindings(g *gocui.Gui) error { |
| if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func quit(g *gocui.Gui, v *gocui.View) error { |
| for i := 0; i < NumGoroutines; i++ { |
| done <- true |
| } |
| return gocui.ErrQuit |
| } |
| |
| func counter(g *gocui.Gui) { |
| defer wg.Done() |
| |
| for { |
| select { |
| case <-done: |
| return |
| case <-time.After(500 * time.Millisecond): |
| mu.Lock() |
| n := ctr |
| ctr++ |
| mu.Unlock() |
| |
| g.Execute(func(g *gocui.Gui) error { |
| v, err := g.View("ctr") |
| if err != nil { |
| return err |
| } |
| v.Clear() |
| fmt.Fprintln(v, n) |
| return nil |
| }) |
| } |
| } |
| } |