Non-scrolling file viewer

editor/draw.go

@@ -26,9 +26,9 @@ func (e *editor) RefreshScreen() {
 }
 
 func (e *editor) drawRows(ab *buffer) {
-	for y :=0; y < e.screen.Rows; y += 1 {
+	for y :=0; y < e.screen.Rows; y++ {
-		if y >= e.screen.Rows {
+		if y >= len(e.rows) {
-			if y == e.screen.Rows / 3 {
+			if len(e.rows) == 0 && y == e.screen.Rows / 3 {
 				welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion)
 				if len(welcome) > e.screen.Cols {
 					welcome = truncateString(welcome, e.screen.Cols)
@@ -50,10 +50,10 @@ func (e *editor) drawRows(ab *buffer) {
 				ab.appendRune('~')
 			}
 		} else {
-			ab.append(string(e.rows[0].chars))
+			row := truncateString(string(e.rows[y].chars), e.screen.Cols)
+			ab.append(row)
 		}
 
-
 		ab.append(terminal.ClearLine)
 
 		if y < (e.screen.Rows - 1) {

editor/editor.go

@@ -26,7 +26,6 @@ func New() *editor {
 	screen := terminal.Size()
 	cursor := &cursor { 0, 0 }
 	var rows []*row
-	rows = append(rows, NewRow(""))
 
 	return &editor{screen, cursor, rows }
 }
@@ -41,13 +40,9 @@ func (e *editor) Open(filename string) {
 	scanner := bufio.NewScanner(file)
 	scanner.Split(bufio.ScanLines)
 
-	var lines []string
-
 	for scanner.Scan() {
-		lines = append(lines, scanner.Text())
+		e.appendRow(scanner.Text())
 	}
-
-	e.rows = append(e.rows, NewRow(lines[0]))
 }
 
 func (e *editor) ProcessKeypress() bool {
@@ -174,3 +169,8 @@ func parseEscapeSequence () string {
 
 	return string('\x1b')
 }
+
+func (e *editor) appendRow(s string) {
+	newRow := NewRow(s)
+	e.rows = append(e.rows, newRow)
+}

editor/fn.go

@@ -9,6 +9,10 @@ func truncateString(s string, length int) string {
 		return ""
 	}
 
+	if len(s) < length {
+		return s
+	}
+
 	var buf strings.Builder
 	count := 0