Further cleanup main package

gilo.go

@@ -1,9 +1,6 @@
 package main
 
 import (
-	"bufio"
-	"os"
-
 	"timshome.page/gilo/internal/editor"
 	"timshome.page/gilo/internal/terminal"
 )
@@ -13,9 +10,8 @@ func main() {
 	oldState := terminal.RawOn()
 	defer terminal.RawOff(oldState)
 
-	reader := bufio.NewReader(os.Stdin)
-
-	for editor.ProcessKeypress(reader) {
-		// loop!
+	// The input loop
+	for editor.ProcessKeypress() {
+		editor.RefreshScreen()
 	}
 }

internal/editor/editor.go

@@ -2,12 +2,15 @@ package editor
 
 import (
 	"bufio"
+	"os"
 
 	"timshome.page/gilo/internal/char"
 	"timshome.page/gilo/internal/terminal"
 )
 
-func readKey(reader *bufio.Reader) (rune, int) {
+var reader = bufio.NewReader(os.Stdin)
+
+func readKey() (rune, int) {
 	ch, size, err := reader.ReadRune()
 	if err != nil {
 		panic(err)
@@ -16,14 +19,24 @@ func readKey(reader *bufio.Reader) (rune, int) {
 	return ch, size
 }
 
-func ProcessKeypress(reader *bufio.Reader) bool {
-	ch, _ := readKey(reader)
+func RefreshScreen() {
+	terminal.ANSICode(terminal.ClearScreen)
+	terminal.ANSICode(terminal.ResetCursor)
+}
+
+func ProcessKeypress() bool {
+	ch, _ := readKey()
+
+	// Clean up on exit
+	if ch == char.Ctrl('q') {
+		terminal.ANSICode(terminal.ClearScreen)
+		terminal.ANSICode(terminal.ResetCursor)
+
+		return false
+	}
 
 	// Ugliest syntax structure ever?
 	switch {
-	case ch == char.Ctrl('q'):
-		terminal.OutLn("bye!")
-		return false
 	case char.IsCtrl(ch):
 		terminal.OutLn("%d", ch)
 	default:

internal/terminal/terminal.go

@@ -7,6 +7,9 @@ import (
 	"golang.org/x/term"
 )
 
+const ClearScreen = "2J"
+const ResetCursor = "H"
+
 // Is this a valid interactive terminal?
 func check() {
 	if !term.IsTerminal(int(os.Stdin.Fd())) {
@@ -34,6 +37,10 @@ func RawOff(oldState *term.State) {
 	}
 }
 
+func ANSICode (code string) {
+	fmt.Printf("\x1b[%s", code)
+}
+
 // Print a formatted string to stdout, with CRLF line endings for proper terminal formatting
 func OutLn(format string, a ...interface{}) {
 	formatted := fmt.Sprintf(format, a...)