package editor import ( "fmt" "strings" "timshome.page/gilo/fn" "timshome.page/gilo/terminal" ) // ---------------------------------------------------------------------------- // !Editor // ---------------------------------------------------------------------------- type cursor struct { x int y int } type editor struct { screen *terminal.Screen cursor *cursor } func New() *editor { screen := terminal.Size() cursor := &cursor { 0, 0 } return &editor{screen, cursor } } func (e *editor) RefreshScreen() { ab := newBuffer() ab.append(terminal.HideCursor) ab.append(terminal.ResetCursor) e.drawRows(ab) ab.append(terminal.MoveCursor(e.cursor.x, e.cursor.y)) ab.append(terminal.ShowCursor) terminal.Write(ab.toString()) } func (e *editor) drawRows(ab *buffer) { for y :=0; y < e.screen.Rows; y += 1 { if y == e.screen.Rows / 3 { welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion) if len(welcome) > e.screen.Cols { welcome = fn.TruncateString(welcome, e.screen.Cols) } padding := (e.screen.Cols - len(welcome)) / 2 if padding > 0 { ab.appendRune('~') padding-- } for padding > 0 { padding-- ab.appendRune(' ') } ab.append(welcome) } else { ab.appendRune('~') } ab.append(terminal.ClearLine) if y < (e.screen.Rows - 1) { ab.append("\r\n") } } } func (e *editor) ProcessKeypress() bool { str, _ := terminal.Read() // Escape sequences can be less fun... if strings.Contains(str, terminal.EscPrefix) { code := strings.TrimPrefix(str, terminal.EscPrefix) switch code { case KeyArrowUp, KeyArrowDown, KeyArrowLeft, KeyArrowRight: e.moveCursor(code) default: // Do something later } } for _, ch := range str { // Clean up on exit if ch == fn.Ctrl('q') { terminal.Write(terminal.ClearScreen + terminal.ResetCursor) return false } } return true } func (e *editor) moveCursor (rawKey string) { key := keyMap[rawKey] switch key { case keyLeft: e.cursor.x -= 1 case keyRight: e.cursor.x += 1 case keyUp: e.cursor.y -= 1 case keyDown: e.cursor.y += 1 } }