Merge pull request #25 from debeando/terminal-refresh

Terminal refresh

Author: nicola-strappazzon

terminal/main.go

@@ -7,37 +7,58 @@ import (
 	"fmt"
 	"math"
 	"os"
+	"time"
 
 	"golang.org/x/sys/unix"
 )
 
 const (
-	// Clear screen
-	CLEAR = "\033[2J"
-	// Return cursor to top left
-	RESET_CURSOR = "\033[H"
-	// Reset all custom styles
+	// Reset all custom styles.
 	RESET = "\033[0m"
-	// Reset to default color
+	// Reset to default color.
 	RESET_COLOR = "\033[39;49m"
-	// Return cursor to start of line and clean it
-	RESET_LINE = "\r\033[K"
+	// Return cursor to start of line and clean it.
+	LINE_RESET = "\r\033[K"
+	// Erase the entire line.
+	LINE_ERASE = "\x1B[2K"
+	// Restore screen.
+	SCREEN_RESTORE = "\x1B[?47l"
+	// Save screen.
+	SCREEN_SAVE = "\x1B[?47h"
+	// Clear complete screen.
+	SCREEN_CLEAR = "\033[2J"
+	// Return cursor to top left.
+	CURSOR_RESET = "\033[H"
+	// Hide cursor.
+	CURSOR_HIDE = "\x1b[?25l"
+	// Show cursor.
+	CURSOR_SHOW = "\x1b[?25h"
+	// Erase from cursor to beginning of screen.
+	CURSOR_ERASE_FBS = "\x1B[1J"
+	// Erase from cursor to end of screen.
+	CURSOR_ERASE_FES = "\x1B[0J"
+	// Set new cursor position on screen.
+	CURSOR_SET_POSITION = "\x1B[%d;%dH"
+	// Save the cursor position.
+	CURSOR_SAVE_POSITION = "\x1B7"
+	// Restore the cursor position.
+	CURSOR_RESTORE_POSITION = "\x1B8"
 )
 
 var Output *bufio.Writer = bufio.NewWriter(os.Stdout)
 var Screen *bytes.Buffer = new(bytes.Buffer)
 
 func Clear() {
 	// Clear screen
-	Output.WriteString(CLEAR)
+	Output.WriteString(SCREEN_CLEAR)
 	// Return cursor to top left
-	Output.WriteString(RESET_CURSOR)
+	Output.WriteString(CURSOR_RESET)
 }
 
 func Reset() {
-	fmt.Print(RESET)
-	fmt.Print(RESET_COLOR)
-	fmt.Print(RESET_LINE)
+	Output.WriteString(RESET)
+	Output.WriteString(RESET_COLOR)
+	Output.WriteString(LINE_RESET)
 }
 
 func Flush() {
@@ -65,12 +86,74 @@ func Height() int {
 	return int(ws.Row)
 }
 
-func Cursor(x, y int) {
-	fmt.Printf("\x1B[%d;%dH", x, y)
+func ScreenSave() {
+	Output.WriteString(SCREEN_SAVE)
+}
+
+func ScreenRestore() {
+	Output.WriteString(SCREEN_RESTORE)
 }
 
-func Refresh(f func()) {
+func LineReset() {
+	Output.WriteString(LINE_RESET)
+}
+
+func LineErase() {
+	Output.WriteString(LINE_ERASE)
+}
+
+func CursorHide() {
+	Output.WriteString(CURSOR_HIDE)
+}
+
+func CursorShow() {
+	Output.WriteString(CURSOR_SHOW)
+	Flush()
+}
+
+func CursorRestore() {
+	Output.WriteString(CURSOR_RESTORE_POSITION)
+	Flush()
+}
+
+func CursorSave() {
+	Output.WriteString(CURSOR_SAVE_POSITION)
+}
+
+func CursorSet(x, y int) {
+	Output.WriteString(fmt.Sprintf(CURSOR_SET_POSITION, x, y))
+}
+
+func CursorEraseToEndScreen() {
+	Output.WriteString(CURSOR_ERASE_FES)
+}
+
+func CursorEraseToBeginningScreen() {
+	Output.WriteString(CURSOR_ERASE_FBS)
+}
+
+func Refresh(wait int, f func()) {
+	Reset()
+	Clear()
+	CursorHide()
+	Flush()
+
+	for {
+		CursorSave()
+		LineErase()
+		CursorEraseToEndScreen()
+		ScreenSave()
+		CursorEraseToBeginningScreen()
+		ScreenRestore()
+		defer CursorRestore()
+
+		CursorSet(0,0)
+		Flush()
+		f()
+		time.Sleep(time.Duration(wait) * time.Second)
+	}
 
+	CursorShow()
 }
 
 func getWinsize() (*unix.Winsize, error) {