CodeMirror: indent with tab or spaces

gistfile1.js

    editor.addKeyMap({
        "Tab": function (cm) {
            if (cm.somethingSelected()) {
                var sel = editor.getSelection("\n");
                // Indent only if there are multiple lines selected, or if the selection spans a full line
                if (sel.length > 0 && (sel.indexOf("\n") > -1 || sel.length === cm.getLine(cm.getCursor().line).length)) {
                    cm.indentSelection("add");
                    return;
                }
            }

            if (cm.options.indentWithTabs)
                cm.execCommand("insertTab");
            else
                cm.execCommand("insertSoftTab");
        },
        "Shift-Tab": function (cm) {
            cm.indentSelection("subtract");
        }
    });