Function up

tools/pythonauto/static/codemirrorepl/codemirrorepl.js:56–66

()

    function undo() {}

    function up() {
        switch (n--) {
            case 0:
                n = 0;
                return;
            case history.length:
                text = mirror.getLine(line).slice(ch);
        }

        mirror.setLine(line, history[n]);
    }

    function down() {
        switch (n++) {