Remove deprecated functions and add comments

input_windows.go

@@ -95,6 +95,6 @@ func (ip *InputProcessor) Run(ctx context.Context) (err error) {
 			}
 			continue
 		}
-		time.Sleep(10 * time.Millisecond)
+		time.Sleep(10 * time.Millisecond) // FIXME: I wanna remove this
 	}
 }

output_windows.go

@@ -15,9 +15,8 @@ import (
 // Output is converted from VT100 escape sequences by mattn/go-colorable.
 type WindowsWriter struct {
 	VT100Writer
-	tty      *tty.TTY
-	writer   io.Writer
-	sigwinch chan WinSize
+	tty    *tty.TTY
+	writer io.Writer
 }
 
 // Flush to flush buffer

prompt.go

@@ -261,6 +261,8 @@ func (p *Prompt) Input() string {
 			case <-ctx.Done():
 				return
 			case <-sigquit:
+				close(sigquit)
+				signal.Stop(sigquit)
 				cancel()
 			}
 		}

render.go

@@ -90,6 +90,7 @@ type Renderer struct {
 	Render chan RenderRequest
 }
 
+// Run to start worker goroutine for rendering.
 func (r *Renderer) Run(ctx context.Context) {
 	r.SetUp()
 	defer r.TearDown()
@@ -116,6 +117,7 @@ func (r *Renderer) Run(ctx context.Context) {
 	}
 }
 
+// RenderRequest is used when requesting render
 type RenderRequest struct {
 	buffer     *Buffer
 	completion *CompletionManager