From f9d0a5b297c0663c49778c0e14109dc24a35f0b3 Mon Sep 17 00:00:00 2001
From: Shivaram Lingamneni <slingamn@cs.stanford.edu>
Date: Sun, 5 Nov 2023 02:05:54 -0500
Subject: [PATCH 1/2] Expose a ClearScreen method

For parity with the original library; fixes #36
---
 example/readline-demo/readline-demo.go |  2 ++
 internal/platform/utils_unix.go        |  6 ------
 internal/platform/utils_windows.go     |  6 ------
 operation.go                           |  6 +-----
 readline.go                            | 11 +++++++----
 utils.go                               |  6 ++++++
 6 files changed, 16 insertions(+), 21 deletions(-)

diff --git a/example/readline-demo/readline-demo.go b/example/readline-demo/readline-demo.go
index 09c54ce..f878135 100644
--- a/example/readline-demo/readline-demo.go
+++ b/example/readline-demo/readline-demo.go
@@ -178,6 +178,8 @@ func main() {
 			} else {
 				log.Println("async writes already started")
 			}
+		case line == "clear":
+			l.ClearScreen()
 		case line == "":
 		default:
 			log.Println("you said:", strconv.Quote(line))
diff --git a/internal/platform/utils_unix.go b/internal/platform/utils_unix.go
index 51ec230..caed6fa 100644
--- a/internal/platform/utils_unix.go
+++ b/internal/platform/utils_unix.go
@@ -4,7 +4,6 @@ package platform
 
 import (
 	"context"
-	"io"
 	"os"
 	"os/signal"
 	"sync"
@@ -74,11 +73,6 @@ func GetScreenSize() (width int, height int) {
 	return
 }
 
-// ClearScreen clears the console screen
-func ClearScreen(w io.Writer) (int, error) {
-	return w.Write([]byte("\033[H"))
-}
-
 func DefaultIsTerminal() bool {
 	return term.IsTerminal(syscall.Stdin) && (term.IsTerminal(syscall.Stdout) || term.IsTerminal(syscall.Stderr))
 }
diff --git a/internal/platform/utils_windows.go b/internal/platform/utils_windows.go
index 69f4695..f4a6f52 100644
--- a/internal/platform/utils_windows.go
+++ b/internal/platform/utils_windows.go
@@ -3,7 +3,6 @@
 package platform
 
 import (
-	"io"
 	"syscall"
 )
 
@@ -38,11 +37,6 @@ func GetScreenSize() (width int, height int) {
 	return
 }
 
-// ClearScreen clears the console screen
-func ClearScreen(_ io.Writer) error {
-	return SetConsoleCursorPosition(&_COORD{0, 0})
-}
-
 func DefaultIsTerminal() bool {
 	return true
 }
diff --git a/operation.go b/operation.go
index 8d275b4..717ec57 100644
--- a/operation.go
+++ b/operation.go
@@ -221,7 +221,7 @@ func (o *operation) readline(deadline chan struct{}) ([]rune, error) {
 				o.Refresh()
 			}
 		case CharCtrlL:
-			platform.ClearScreen(o.t)
+			clearScreen(o.t)
 			o.buf.SetOffset(cursorPosition{1, 1})
 			o.Refresh()
 		case MetaBackspace, CharCtrlW:
@@ -547,7 +547,3 @@ func (o *operation) refresh() {
 		o.buf.Refresh(nil)
 	}
 }
-
-func (o *operation) Clean() {
-	o.buf.Clean()
-}
diff --git a/readline.go b/readline.go
index 7d47632..48c2990 100644
--- a/readline.go
+++ b/readline.go
@@ -267,10 +267,8 @@ func (i *Instance) CaptureExitSignal() {
 	}()
 }
 
-func (i *Instance) Clean() {
-	i.operation.Clean()
-}
-
+// Write writes output to the screen, redrawing the prompt and buffer
+// as needed.
 func (i *Instance) Write(b []byte) (int, error) {
 	return i.Stdout().Write(b)
 }
@@ -304,6 +302,11 @@ func (i *Instance) EnableHistory() {
 	i.operation.history.Enable()
 }
 
+// ClearScreen clears the screen.
+func (i *Instance) ClearScreen() {
+	clearScreen(i.operation.Stdout())
+}
+
 // Painter is a callback type to allow modifying the buffer before it is rendered
 // on screen, for example, to implement real-time syntax highlighting.
 type Painter func(line []rune, pos int) []rune
diff --git a/utils.go b/utils.go
index 9238b67..709d0f2 100644
--- a/utils.go
+++ b/utils.go
@@ -3,6 +3,7 @@ package readline
 import (
 	"container/list"
 	"fmt"
+	"io"
 	"os"
 	"sync"
 
@@ -74,6 +75,11 @@ func (r *rawModeHandler) Exit() error {
 	return err
 }
 
+func clearScreen(w io.Writer) error {
+	_, err := w.Write([]byte("\x1b[H\x1b[J"))
+	return err
+}
+
 // -----------------------------------------------------------------------------
 
 // print a linked list to Debug()

From ab816e23020309760f6a1a4b5f40a92d7bbf7d81 Mon Sep 17 00:00:00 2001
From: Shivaram Lingamneni <slingamn@cs.stanford.edu>
Date: Sun, 5 Nov 2023 08:28:11 -0500
Subject: [PATCH 2/2] add 'async' and 'clear' to demo completer

---
 example/readline-demo/readline-demo.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/example/readline-demo/readline-demo.go b/example/readline-demo/readline-demo.go
index f878135..3529565 100644
--- a/example/readline-demo/readline-demo.go
+++ b/example/readline-demo/readline-demo.go
@@ -60,6 +60,8 @@ var completer = readline.NewPrefixCompleter(
 		readline.PcItem("test"),
 	),
 	readline.PcItem("sleep"),
+	readline.PcItem("async"),
+	readline.PcItem("clear"),
 )
 
 func filterInput(r rune) (rune, bool) {