Extract editor related code

- in public/js/lib/editor/index.js

3 files changed, 536 insertions, 569 deletions

diff --git a/public/js/index.js b/public/js/index.js
index f0c476ef..0d4da4d0 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -73,145 +73,12 @@ import {
 var renderer = require('./render');
 var preventXSS = renderer.preventXSS;
 
-var defaultTextHeight = 20;
-var viewportMargin = 20;
-var mac = CodeMirror.keyMap["default"] == CodeMirror.keyMap.macDefault;
-var defaultEditorMode = 'gfm';
-var defaultExtraKeys = {
-    "F10": function (cm) {
-        cm.setOption("fullScreen", !cm.getOption("fullScreen"));
-    },
-    "Esc": function (cm) {
-        if (cm.getOption('keyMap').substr(0, 3) === 'vim') return CodeMirror.Pass;
-        else if (cm.getOption("fullScreen")) cm.setOption("fullScreen", false);
-    },
-    "Cmd-S": function () {
-        return false;
-    },
-    "Ctrl-S": function () {
-        return false;
-    },
-    "Enter": "newlineAndIndentContinueMarkdownList",
-    "Tab": function (cm) {
-        var tab = '\t';
-        var spaces = Array(parseInt(cm.getOption("indentUnit")) + 1).join(" ");
-        //auto indent whole line when in list or blockquote
-        var cursor = cm.getCursor();
-        var line = cm.getLine(cursor.line);
-        var regex = /^(\s*)(>[> ]*|[*+-]\s|(\d+)([.)]))/;
-        var match;
-        var multiple = cm.getSelection().split('\n').length > 1 || cm.getSelections().length > 1;
-        if (multiple) {
-            cm.execCommand('defaultTab');
-        } else if ((match = regex.exec(line)) !== null) {
-            var ch = match[1].length;
-            var pos = {
-                line: cursor.line,
-                ch: ch
-            };
-            if (cm.getOption('indentWithTabs'))
-                cm.replaceRange(tab, pos, pos, '+input');
-            else
-                cm.replaceRange(spaces, pos, pos, '+input');
-        } else {
-            if (cm.getOption('indentWithTabs'))
-                cm.execCommand('defaultTab');
-            else {
-                cm.replaceSelection(spaces);
-            }
-        }
-    },
-    "Cmd-Left": "goLineLeftSmart",
-    "Cmd-Right": "goLineRight",
-    "Ctrl-C": function (cm) {
-        if (!mac && cm.getOption('keyMap').substr(0, 3) === 'vim') document.execCommand("copy");
-        else return CodeMirror.Pass;
-    },
-    "Ctrl-*": function (cm) {
-        wrapTextWith(cm, '*');
-    },
-    "Shift-Ctrl-8": function (cm) {
-        wrapTextWith(cm, '*');
-    },
-    "Ctrl-_": function (cm) {
-        wrapTextWith(cm, '_');
-    },
-    "Shift-Ctrl--": function (cm) {
-        wrapTextWith(cm, '_');
-    },
-    "Ctrl-~": function (cm) {
-        wrapTextWith(cm, '~');
-    },
-    "Shift-Ctrl-`": function (cm) {
-        wrapTextWith(cm, '~');
-    },
-    "Ctrl-^": function (cm) {
-        wrapTextWith(cm, '^');
-    },
-    "Shift-Ctrl-6": function (cm) {
-        wrapTextWith(cm, '^');
-    },
-    "Ctrl-+": function (cm) {
-        wrapTextWith(cm, '+');
-    },
-    "Shift-Ctrl-=": function (cm) {
-        wrapTextWith(cm, '+');
-    },
-    "Ctrl-=": function (cm) {
-        wrapTextWith(cm, '=');
-    },
-    "Shift-Ctrl-Backspace": function (cm) {
-        wrapTextWith(cm, 'Backspace');
-    }
-};
+import Editor from './lib/editor';
 
-var wrapSymbols = ['*', '_', '~', '^', '+', '='];
+import getUIElements from './lib/editor/ui-elements';
 
-function wrapTextWith(cm, symbol) {
-    if (!cm.getSelection()) {
-        return CodeMirror.Pass;
-    } else {
-        var ranges = cm.listSelections();
-        for (var i = 0; i < ranges.length; i++) {
-            var range = ranges[i];
-            if (!range.empty()) {
-                var from = range.from(), to = range.to();
-                if (symbol !== 'Backspace') {
-                    cm.replaceRange(symbol, to, to, '+input');
-                    cm.replaceRange(symbol, from, from, '+input');
-                    // workaround selection range not correct after add symbol
-                    var _ranges = cm.listSelections();
-                    var anchorIndex = editor.indexFromPos(_ranges[i].anchor);
-                    var headIndex = editor.indexFromPos(_ranges[i].head);
-                    if (anchorIndex > headIndex) {
-                        _ranges[i].anchor.ch--;
-                    } else {
-                        _ranges[i].head.ch--;
-                    }
-                    cm.setSelections(_ranges);
-                } else {
-                    var preEndPos = {
-                        line: to.line,
-                        ch: to.ch + 1
-                    };
-                    var preText = cm.getRange(to, preEndPos);
-                    var preIndex = wrapSymbols.indexOf(preText);
-                    var postEndPos = {
-                        line: from.line,
-                        ch: from.ch - 1
-                    };
-                    var postText = cm.getRange(postEndPos, from);
-                    var postIndex = wrapSymbols.indexOf(postText);
-                    // check if surround symbol are list in array and matched
-                    if (preIndex > -1 && postIndex > -1 && preIndex === postIndex) {
-                        cm.replaceRange("", to, preEndPos, '+delete');
-                        cm.replaceRange("", postEndPos, from, '+delete');
-                    }
-                }
-            }
-        }
-    }
-}
+var defaultTextHeight = 20;
+var viewportMargin = 20;
 
 var idleTime = 300000; //5 mins
 var updateViewDebounce = 100;
@@ -432,353 +299,25 @@ window.fileTypes = {
     "py": "python"
 };
 
-//editor settings
+// editor settings
 var textit = document.getElementById("textit");
-if (!textit) throw new Error("There was no textit area!");
-window.editor = CodeMirror.fromTextArea(textit, {
-    mode: defaultEditorMode,
-    backdrop: defaultEditorMode,
-    keyMap: "sublime",
-    viewportMargin: viewportMargin,
-    styleActiveLine: true,
-    lineNumbers: true,
-    lineWrapping: true,
-    showCursorWhenSelecting: true,
-    highlightSelectionMatches: true,
-    indentUnit: 4,
-    continueComments: "Enter",
-    theme: "one-dark",
-    inputStyle: "textarea",
-    matchBrackets: true,
-    autoCloseBrackets: true,
-    matchTags: {
-        bothTags: true
-    },
-    autoCloseTags: true,
-    foldGutter: true,
-    gutters: ["CodeMirror-linenumbers", "authorship-gutters", "CodeMirror-foldgutter"],
-    extraKeys: defaultExtraKeys,
-    flattenSpans: true,
-    addModeClass: true,
-    readOnly: true,
-    autoRefresh: true,
-    otherCursors: true,
-    placeholder: "← Start by entering a title here\n===\nVisit /features if you don't know what to do.\nHappy hacking :)"
-});
-var inlineAttach = inlineAttachment.editors.codemirror4.attach(editor);
-defaultTextHeight = parseInt($(".CodeMirror").css('line-height'));
-
-var statusBarTemplate = null;
-var statusBar = null;
-var statusPanel = null;
-var statusCursor = null;
-var statusFile = null;
-var statusIndicators = null;
-var statusLength = null;
-var statusKeymap = null;
-var statusIndent = null;
-var statusTheme = null;
-var statusSpellcheck = null;
-var statusPreferences = null;
-
-function getStatusBarTemplate(callback) {
-    $.get(serverurl + '/views/statusbar.html', function (template) {
-        statusBarTemplate = template;
-        if (callback) callback();
-    });
+if (!textit) {
+    throw new Error("There was no textit area!");
 }
-getStatusBarTemplate();
-
-function addStatusBar() {
-    if (!statusBarTemplate) {
-        getStatusBarTemplate(addStatusBar);
-        return;
-    }
-    statusBar = $(statusBarTemplate);
-    statusCursor = statusBar.find('.status-cursor');
-    statusFile = statusBar.find('.status-file');
-    statusIndicators = statusBar.find('.status-indicators');
-    statusIndent = statusBar.find('.status-indent');
-    statusKeymap = statusBar.find('.status-keymap');
-    statusLength = statusBar.find('.status-length');
-    statusTheme = statusBar.find('.status-theme');
-    statusSpellcheck = statusBar.find('.status-spellcheck');
-    statusPreferences = statusBar.find('.status-preferences');
-    statusPanel = editor.addPanel(statusBar[0], {
-        position: "bottom"
-    });
-
-    setIndent();
-    setKeymap();
-    setTheme();
-    setSpellcheck();
-    setPreferences();
-}
-
-function setIndent() {
-    var cookieIndentType = Cookies.get('indent_type');
-    var cookieTabSize = parseInt(Cookies.get('tab_size'));
-    var cookieSpaceUnits = parseInt(Cookies.get('space_units'));
-    if (cookieIndentType) {
-        if (cookieIndentType == 'tab') {
-            editor.setOption('indentWithTabs', true);
-            if (cookieTabSize)
-                editor.setOption('indentUnit', cookieTabSize);
-        } else if (cookieIndentType == 'space') {
-            editor.setOption('indentWithTabs', false);
-            if (cookieSpaceUnits)
-                editor.setOption('indentUnit', cookieSpaceUnits);
-        }
-    }
-    if (cookieTabSize)
-        editor.setOption('tabSize', cookieTabSize);
-
-    var type = statusIndicators.find('.indent-type');
-    var widthLabel = statusIndicators.find('.indent-width-label');
-    var widthInput = statusIndicators.find('.indent-width-input');
-
-    function setType() {
-        if (editor.getOption('indentWithTabs')) {
-            Cookies.set('indent_type', 'tab', {
-                expires: 365
-            });
-            type.text('Tab Size:');
-        } else {
-            Cookies.set('indent_type', 'space', {
-                expires: 365
-            });
-            type.text('Spaces:');
-        }
-    }
-    setType();
 
-    function setUnit() {
-        var unit = editor.getOption('indentUnit');
-        if (editor.getOption('indentWithTabs')) {
-            Cookies.set('tab_size', unit, {
-                expires: 365
-            });
-        } else {
-            Cookies.set('space_units', unit, {
-                expires: 365
-            });
-        }
-        widthLabel.text(unit);
-    }
-    setUnit();
+const editorInstance = new Editor();
+var editor = editorInstance.init(textit);
 
-    type.click(function () {
-        if (editor.getOption('indentWithTabs')) {
-            editor.setOption('indentWithTabs', false);
-            cookieSpaceUnits = parseInt(Cookies.get('space_units'));
-            if (cookieSpaceUnits)
-                editor.setOption('indentUnit', cookieSpaceUnits)
-        } else {
-            editor.setOption('indentWithTabs', true);
-            cookieTabSize = parseInt(Cookies.get('tab_size'));
-            if (cookieTabSize) {
-                editor.setOption('indentUnit', cookieTabSize);
-                editor.setOption('tabSize', cookieTabSize);
-            }
-        }
-        setType();
-        setUnit();
-    });
-    widthLabel.click(function () {
-        if (widthLabel.is(':visible')) {
-            widthLabel.addClass('hidden');
-            widthInput.removeClass('hidden');
-            widthInput.val(editor.getOption('indentUnit'));
-            widthInput.select();
-        } else {
-            widthLabel.removeClass('hidden');
-            widthInput.addClass('hidden');
-        }
-    });
-    widthInput.on('change', function () {
-        var val = parseInt(widthInput.val());
-        if (!val) val = editor.getOption('indentUnit');
-        if (val < 1) val = 1;
-        else if (val > 10) val = 10;
+// TODO: global referncing in jquery-textcomplete patch
+window.editor = editor;
 
-        if (editor.getOption('indentWithTabs')) {
-            editor.setOption('tabSize', val);
-        }
-        editor.setOption('indentUnit', val);
-        setUnit();
-    });
-    widthInput.on('blur', function () {
-        widthLabel.removeClass('hidden');
-        widthInput.addClass('hidden');
-    });
-}
-
-function setKeymap() {
-    var cookieKeymap = Cookies.get('keymap');
-    if (cookieKeymap)
-        editor.setOption('keyMap', cookieKeymap);
-
-    var label = statusIndicators.find('.ui-keymap-label');
-    var sublime = statusIndicators.find('.ui-keymap-sublime');
-    var emacs = statusIndicators.find('.ui-keymap-emacs');
-    var vim = statusIndicators.find('.ui-keymap-vim');
-
-    function setKeymapLabel() {
-        var keymap = editor.getOption('keyMap');
-        Cookies.set('keymap', keymap, {
-            expires: 365
-        });
-        label.text(keymap);
-        restoreOverrideEditorKeymap();
-        setOverrideBrowserKeymap();
-    }
-    setKeymapLabel();
-
-    sublime.click(function () {
-        editor.setOption('keyMap', 'sublime');
-        setKeymapLabel();
-    });
-    emacs.click(function () {
-        editor.setOption('keyMap', 'emacs');
-        setKeymapLabel();
-    });
-    vim.click(function () {
-        editor.setOption('keyMap', 'vim');
-        setKeymapLabel();
-    });
-}
-
-function setTheme() {
-    var cookieTheme = Cookies.get('theme');
-    if (cookieTheme) {
-        editor.setOption('theme', cookieTheme);
-    }
-
-    var themeToggle = statusTheme.find('.ui-theme-toggle');
-    themeToggle.click(function () {
-        var theme = editor.getOption('theme');
-        if (theme == "one-dark") {
-            theme = "default";
-        } else {
-            theme = "one-dark";
-        }
-        editor.setOption('theme', theme);
-        Cookies.set('theme', theme, {
-            expires: 365
-        });
-        checkTheme();
-    });
-    function checkTheme() {
-        var theme = editor.getOption('theme');
-        if (theme == "one-dark") {
-            themeToggle.removeClass('active');
-        } else {
-            themeToggle.addClass('active');
-        }
-    }
-    checkTheme();
-}
-
-function setSpellcheck() {
-    var cookieSpellcheck = Cookies.get('spellcheck');
-    if (cookieSpellcheck) {
-        var mode = null;
-        if (cookieSpellcheck === 'true' || cookieSpellcheck === true) {
-            mode = 'spell-checker';
-        } else {
-            mode = defaultEditorMode;
-        }
-        if (mode && mode !== editor.getOption('mode')) {
-            editor.setOption('mode', mode);
-        }
-    }
-
-    var spellcheckToggle = statusSpellcheck.find('.ui-spellcheck-toggle');
-    spellcheckToggle.click(function () {
-        var mode = editor.getOption('mode');
-        if (mode == defaultEditorMode) {
-            mode = "spell-checker";
-        } else {
-            mode = defaultEditorMode;
-        }
-        if (mode && mode !== editor.getOption('mode')) {
-            editor.setOption('mode', mode);
-        }
-        Cookies.set('spellcheck', (mode == "spell-checker"), {
-            expires: 365
-        });
-        checkSpellcheck();
-    });
-    function checkSpellcheck() {
-        var mode = editor.getOption('mode');
-        if (mode == defaultEditorMode) {
-            spellcheckToggle.removeClass('active');
-        } else {
-            spellcheckToggle.addClass('active');
-        }
-    }
-    checkSpellcheck();
-
-    //workaround spellcheck might not activate beacuse the ajax loading
-    if (num_loaded < 2) {
-        var spellcheckTimer = setInterval(function () {
-            if (num_loaded >= 2) {
-                if (editor.getOption('mode') == "spell-checker")
-                    editor.setOption('mode', "spell-checker");
-                clearInterval(spellcheckTimer);
-            }
-        }, 100);
-    }
-}
-
-var jumpToAddressBarKeymapName = mac ? "Cmd-L" : "Ctrl-L";
-var jumpToAddressBarKeymapValue = null;
-function resetEditorKeymapToBrowserKeymap() {
-    var keymap = editor.getOption('keyMap');
-    if (!jumpToAddressBarKeymapValue) {
-        jumpToAddressBarKeymapValue = CodeMirror.keyMap[keymap][jumpToAddressBarKeymapName];
-        delete CodeMirror.keyMap[keymap][jumpToAddressBarKeymapName];
-    }
-}
-function restoreOverrideEditorKeymap() {
-    var keymap = editor.getOption('keyMap');
-    if (jumpToAddressBarKeymapValue) {
-        CodeMirror.keyMap[keymap][jumpToAddressBarKeymapName] = jumpToAddressBarKeymapValue;
-        jumpToAddressBarKeymapValue = null;
-    }
-}
-function setOverrideBrowserKeymap() {
-    var overrideBrowserKeymap = $('.ui-preferences-override-browser-keymap label > input[type="checkbox"]');
-    if(overrideBrowserKeymap.is(":checked")) {
-        Cookies.set('preferences-override-browser-keymap', true, {
-            expires: 365
-        });
-        restoreOverrideEditorKeymap();
-    } else {
-        Cookies.remove('preferences-override-browser-keymap');
-        resetEditorKeymapToBrowserKeymap();
-    }
-}
-
-function setPreferences() {
-    var overrideBrowserKeymap = $('.ui-preferences-override-browser-keymap label > input[type="checkbox"]');
-    var cookieOverrideBrowserKeymap = Cookies.get('preferences-override-browser-keymap');
-    if (cookieOverrideBrowserKeymap && cookieOverrideBrowserKeymap === "true") {
-        overrideBrowserKeymap.prop('checked', true);
-    } else {
-        overrideBrowserKeymap.prop('checked', false);
-    }
-    setOverrideBrowserKeymap();
-
-    overrideBrowserKeymap.change(function() {
-        setOverrideBrowserKeymap();
-    });
-}
+var inlineAttach = inlineAttachment.editors.codemirror4.attach(editor);
+defaultTextHeight = parseInt($(".CodeMirror").css('line-height'));
 
 var selection = null;
 
 function updateStatusBar() {
-    if (!statusBar) return;
+    if (!editorInstance.statusBar) return;
     var cursor = editor.getCursor();
     var cursorText = 'Line ' + (cursor.line + 1) + ', Columns ' + (cursor.ch + 1);
     if (selection) {
@@ -800,102 +339,25 @@ function updateStatusBar() {
         if (start.line !== end.line || selectionCharCount > 0)
             cursorText += selectionText;
     }
-    statusCursor.text(cursorText);
+    editorInstance.statusCursor.text(cursorText);
     var fileText = ' — ' + editor.lineCount() + ' Lines';
-    statusFile.text(fileText);
+    editorInstance.statusFile.text(fileText);
     var docLength = editor.getValue().length;
-    statusLength.text('Length ' + docLength);
+    editorInstance.statusLength.text('Length ' + docLength);
     if (docLength > (docmaxlength * 0.95)) {
-        statusLength.css('color', 'red');
-        statusLength.attr('title', 'Your almost reach note max length limit.');
+        editorInstance.statusLength.css('color', 'red');
+        editorInstance.statusLength.attr('title', 'Your almost reach note max length limit.');
     } else if (docLength > (docmaxlength * 0.8)) {
-        statusLength.css('color', 'orange');
-        statusLength.attr('title', 'You nearly fill the note, consider to make more pieces.');
+        editorInstance.statusLength.css('color', 'orange');
+        editorInstance.statusLength.attr('title', 'You nearly fill the note, consider to make more pieces.');
     } else {
-        statusLength.css('color', 'white');
-        statusLength.attr('title', 'You could write up to ' + docmaxlength + ' characters in this note.');
-    }
-}
-
-//ui vars
-window.ui = {
-    spinner: $(".ui-spinner"),
-    content: $(".ui-content"),
-    toolbar: {
-        shortStatus: $(".ui-short-status"),
-        status: $(".ui-status"),
-        new: $(".ui-new"),
-        publish: $(".ui-publish"),
-        extra: {
-            revision: $(".ui-extra-revision"),
-            slide: $(".ui-extra-slide")
-        },
-        download: {
-            markdown: $(".ui-download-markdown"),
-            html: $(".ui-download-html"),
-            rawhtml: $(".ui-download-raw-html"),
-            pdf: $(".ui-download-pdf-beta"),
-        },
-        export: {
-            dropbox: $(".ui-save-dropbox"),
-            googleDrive: $(".ui-save-google-drive"),
-            gist: $(".ui-save-gist"),
-            snippet: $(".ui-save-snippet")
-        },
-        import: {
-            dropbox: $(".ui-import-dropbox"),
-            googleDrive: $(".ui-import-google-drive"),
-            gist: $(".ui-import-gist"),
-            snippet: $(".ui-import-snippet"),
-            clipboard: $(".ui-import-clipboard")
-        },
-        mode: $(".ui-mode"),
-        edit: $(".ui-edit"),
-        view: $(".ui-view"),
-        both: $(".ui-both"),
-        uploadImage: $(".ui-upload-image")
-    },
-    infobar: {
-        lastchange: $(".ui-lastchange"),
-        lastchangeuser: $(".ui-lastchangeuser"),
-        nolastchangeuser: $(".ui-no-lastchangeuser"),
-        permission: {
-            permission: $(".ui-permission"),
-            label: $(".ui-permission-label"),
-            freely: $(".ui-permission-freely"),
-            editable: $(".ui-permission-editable"),
-            locked: $(".ui-permission-locked"),
-            private: $(".ui-permission-private"),
-            limited: $(".ui-permission-limited"),
-            protected: $(".ui-permission-protected")
-        },
-        delete: $(".ui-delete-note")
-    },
-    toc: {
-        toc: $('.ui-toc'),
-        affix: $('.ui-affix-toc'),
-        label: $('.ui-toc-label'),
-        dropdown: $('.ui-toc-dropdown')
-    },
-    area: {
-        edit: $(".ui-edit-area"),
-        view: $(".ui-view-area"),
-        codemirror: $(".ui-edit-area .CodeMirror"),
-        codemirrorScroll: $(".ui-edit-area .CodeMirror .CodeMirror-scroll"),
-        codemirrorSizer: $(".ui-edit-area .CodeMirror .CodeMirror-sizer"),
-        codemirrorSizerInner: $(".ui-edit-area .CodeMirror .CodeMirror-sizer > div"),
-        markdown: $(".ui-view-area .markdown-body"),
-        resize: {
-            handle: $('.ui-resizable-handle'),
-            syncToggle: $('.ui-sync-toggle')
-        }
-    },
-    modal: {
-        snippetImportProjects: $("#snippetImportModalProjects"),
-        snippetImportSnippets: $("#snippetImportModalSnippets"),
-        revision: $("#revisionModal")
+        editorInstance.statusLength.css('color', 'white');
+        editorInstance.statusLength.attr('title', 'You could write up to ' + docmaxlength + ' characters in this note.');
     }
-};
+}
+
+//  initalize ui reference
+const ui = getUIElements();
 
 //page actions
 var opts = {
@@ -1146,7 +608,7 @@ var lastEditorWidth = 0;
 var previousFocusOnEditor = null;
 
 function checkEditorStyle() {
-    var desireHeight = statusBar ? (ui.area.edit.height() - statusBar.outerHeight()) : ui.area.edit.height();
+    var desireHeight = editorInstance.statusBar ? (ui.area.edit.height() - editorInstance.statusBar.outerHeight()) : ui.area.edit.height();
     // set editor height and min height based on scrollbar style and mode
     var scrollbarStyle = editor.getOption('scrollbarStyle');
     if (scrollbarStyle == 'overlay' || currentMode == modeType.both) {
@@ -1381,8 +843,8 @@ function changeMode(type) {
     if (currentMode == modeType.edit || currentMode == modeType.both) {
         ui.toolbar.uploadImage.fadeIn();
         //add and update status bar
-        if (!statusBar) {
-            addStatusBar();
+        if (!editorInstance.statusBar) {
+            editorInstance.addStatusBar();
             updateStatusBar();
         }
         //work around foldGutter might not init properly
@@ -4069,6 +3531,6 @@ $(editor.getInputField())
         },
         'textComplete:hide': function (e) {
             $(this).data('autocompleting', false);
-            editor.setOption("extraKeys", defaultExtraKeys);
+            editor.setOption("extraKeys", editorInstance.defaultExtraKeys);
         }
     });
diff --git a/public/js/lib/editor/index.js b/public/js/lib/editor/index.js
new file mode 100644
index 00000000..ec22ac92
--- /dev/null
+++ b/public/js/lib/editor/index.js
@@ -0,0 +1,459 @@
+import * as utils from './utils';
+
+/* config section */
+const isMac = CodeMirror.keyMap.default === CodeMirror.keyMap.macDefault;
+const defaultEditorMode = 'gfm';
+const viewportMargin = 20;
+
+const jumpToAddressBarKeymapName = isMac ? "Cmd-L" : "Ctrl-L";
+
+export default class Editor {
+    constructor() {
+        this.editor = null;
+
+        this.defaultExtraKeys = {
+            "F10": function (cm) {
+                cm.setOption("fullScreen", !cm.getOption("fullScreen"));
+            },
+            "Esc": function (cm) {
+                if (cm.getOption('keyMap').substr(0, 3) === 'vim') return CodeMirror.Pass;
+                else if (cm.getOption("fullScreen")) cm.setOption("fullScreen", false);
+            },
+            "Cmd-S": function () {
+                return false;
+            },
+            "Ctrl-S": function () {
+                return false;
+            },
+            "Enter": "newlineAndIndentContinueMarkdownList",
+            "Tab": function (cm) {
+                var tab = '\t';
+
+                // contruct x length spaces
+                var spaces = Array(parseInt(cm.getOption("indentUnit")) + 1).join(" ");
+
+                //auto indent whole line when in list or blockquote
+                var cursor = cm.getCursor();
+                var line = cm.getLine(cursor.line);
+
+                // this regex match the following patterns
+                // 1. blockquote starts with "> " or ">>"
+                // 2. unorder list starts with *+-
+                // 3. order list starts with "1." or "1)"
+                var regex = /^(\s*)(>[> ]*|[*+-]\s|(\d+)([.)]))/;
+
+                var match;
+                var multiple = cm.getSelection().split('\n').length > 1 || cm.getSelections().length > 1;
+
+                if (multiple) {
+                    cm.execCommand('defaultTab');
+                } else if ((match = regex.exec(line)) !== null) {
+                    var ch = match[1].length;
+                    var pos = {
+                        line: cursor.line,
+                        ch: ch
+                    };
+                    if (cm.getOption('indentWithTabs'))
+                        cm.replaceRange(tab, pos, pos, '+input');
+                    else
+                        cm.replaceRange(spaces, pos, pos, '+input');
+                } else {
+                    if (cm.getOption('indentWithTabs'))
+                        cm.execCommand('defaultTab');
+                    else {
+                        cm.replaceSelection(spaces);
+                    }
+                }
+            },
+            "Cmd-Left": "goLineLeftSmart",
+            "Cmd-Right": "goLineRight",
+            "Ctrl-C": function (cm) {
+                if (!isMac && cm.getOption('keyMap').substr(0, 3) === 'vim') {
+                    document.execCommand("copy");
+                } else {
+                    return CodeMirror.Pass;
+                }
+            },
+            "Ctrl-*": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '*');
+            },
+            "Shift-Ctrl-8": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '*');
+            },
+            "Ctrl-_": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '_');
+            },
+            "Shift-Ctrl--": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '_');
+            },
+            "Ctrl-~": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '~');
+            },
+            "Shift-Ctrl-`": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '~');
+            },
+            "Ctrl-^": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '^');
+            },
+            "Shift-Ctrl-6": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '^');
+            },
+            "Ctrl-+": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '+');
+            },
+            "Shift-Ctrl-=": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '+');
+            },
+            "Ctrl-=": (cm) => {
+                utils.wrapTextWith(this.editor, cm, '=');
+            },
+            "Shift-Ctrl-Backspace": (cm) => {
+                utils.wrapTextWith(this.editor, cm, 'Backspace');
+            }
+        };
+
+        this.jumpToAddressBarKeymapValue = null;
+    }
+
+    getStatusBarTemplate(callback) {
+        $.get(window.serverurl + '/views/statusbar.html', (template) => {
+            this.statusBarTemplate = template;
+            if (callback) callback();
+        });
+    }
+
+    addStatusBar() {
+        if (!this.statusBarTemplate) {
+            this.getStatusBarTemplate(this.addStatusBar);
+            return;
+        }
+        this.statusBar = $(this.statusBarTemplate);
+        this.statusCursor = this.statusBar.find('.status-cursor');
+        this.statusFile = this.statusBar.find('.status-file');
+        this.statusIndicators = this.statusBar.find('.status-indicators');
+        this.statusIndent = this.statusBar.find('.status-indent');
+        this.statusKeymap = this.statusBar.find('.status-keymap');
+        this.statusLength = this.statusBar.find('.status-length');
+        this.statusTheme = this.statusBar.find('.status-theme');
+        this.statusSpellcheck = this.statusBar.find('.status-spellcheck');
+        this.statusPreferences = this.statusBar.find('.status-preferences');
+        this.statusPanel = this.editor.addPanel(this.statusBar[0], {
+            position: "bottom"
+        });
+
+        this.setIndent();
+        this.setKeymap();
+        this.setTheme();
+        this.setSpellcheck();
+        this.setPreferences();
+    }
+
+    setIndent() {
+        var cookieIndentType = Cookies.get('indent_type');
+        var cookieTabSize = parseInt(Cookies.get('tab_size'));
+        var cookieSpaceUnits = parseInt(Cookies.get('space_units'));
+        if (cookieIndentType) {
+            if (cookieIndentType == 'tab') {
+                this.editor.setOption('indentWithTabs', true);
+                if (cookieTabSize)
+                    this.editor.setOption('indentUnit', cookieTabSize);
+            } else if (cookieIndentType == 'space') {
+                this.editor.setOption('indentWithTabs', false);
+                if (cookieSpaceUnits)
+                    this.editor.setOption('indentUnit', cookieSpaceUnits);
+            }
+        }
+        if (cookieTabSize)
+            this.editor.setOption('tabSize', cookieTabSize);
+
+        var type = this.statusIndicators.find('.indent-type');
+        var widthLabel = this.statusIndicators.find('.indent-width-label');
+        var widthInput = this.statusIndicators.find('.indent-width-input');
+
+        const setType = () => {
+            if (this.editor.getOption('indentWithTabs')) {
+                Cookies.set('indent_type', 'tab', {
+                    expires: 365
+                });
+                type.text('Tab Size:');
+            } else {
+                Cookies.set('indent_type', 'space', {
+                    expires: 365
+                });
+                type.text('Spaces:');
+            }
+        }
+        setType();
+
+        const setUnit = () => {
+            var unit = this.editor.getOption('indentUnit');
+            if (this.editor.getOption('indentWithTabs')) {
+                Cookies.set('tab_size', unit, {
+                    expires: 365
+                });
+            } else {
+                Cookies.set('space_units', unit, {
+                    expires: 365
+                });
+            }
+            widthLabel.text(unit);
+        }
+        setUnit();
+
+        type.click(() => {
+            if (this.editor.getOption('indentWithTabs')) {
+                this.editor.setOption('indentWithTabs', false);
+                cookieSpaceUnits = parseInt(Cookies.get('space_units'));
+                if (cookieSpaceUnits)
+                    this.editor.setOption('indentUnit', cookieSpaceUnits)
+            } else {
+                this.editor.setOption('indentWithTabs', true);
+                cookieTabSize = parseInt(Cookies.get('tab_size'));
+                if (cookieTabSize) {
+                    this.editor.setOption('indentUnit', cookieTabSize);
+                    this.editor.setOption('tabSize', cookieTabSize);
+                }
+            }
+            setType();
+            setUnit();
+        });
+        widthLabel.click(() => {
+            if (widthLabel.is(':visible')) {
+                widthLabel.addClass('hidden');
+                widthInput.removeClass('hidden');
+                widthInput.val(this.editor.getOption('indentUnit'));
+                widthInput.select();
+            } else {
+                widthLabel.removeClass('hidden');
+                widthInput.addClass('hidden');
+            }
+        });
+        widthInput.on('change', () => {
+            var val = parseInt(widthInput.val());
+            if (!val) val = this.editor.getOption('indentUnit');
+            if (val < 1) val = 1;
+            else if (val > 10) val = 10;
+
+            if (this.editor.getOption('indentWithTabs')) {
+                this.editor.setOption('tabSize', val);
+            }
+            this.editor.setOption('indentUnit', val);
+            setUnit();
+        });
+        widthInput.on('blur', function () {
+            widthLabel.removeClass('hidden');
+            widthInput.addClass('hidden');
+        });
+    }
+
+    setKeymap() {
+        var cookieKeymap = Cookies.get('keymap');
+        if (cookieKeymap)
+            this.editor.setOption('keyMap', cookieKeymap);
+
+        var label = this.statusIndicators.find('.ui-keymap-label');
+        var sublime = this.statusIndicators.find('.ui-keymap-sublime');
+        var emacs = this.statusIndicators.find('.ui-keymap-emacs');
+        var vim = this.statusIndicators.find('.ui-keymap-vim');
+
+        const setKeymapLabel = () => {
+            var keymap = this.editor.getOption('keyMap');
+            Cookies.set('keymap', keymap, {
+                expires: 365
+            });
+            label.text(keymap);
+            this.restoreOverrideEditorKeymap();
+            this.setOverrideBrowserKeymap();
+        }
+        setKeymapLabel();
+
+        sublime.click(() => {
+            this.editor.setOption('keyMap', 'sublime');
+            setKeymapLabel();
+        });
+        emacs.click(() => {
+            this.editor.setOption('keyMap', 'emacs');
+            setKeymapLabel();
+        });
+        vim.click(() => {
+            this.editor.setOption('keyMap', 'vim');
+            setKeymapLabel();
+        });
+    }
+
+    setTheme() {
+        var cookieTheme = Cookies.get('theme');
+        if (cookieTheme) {
+            this.editor.setOption('theme', cookieTheme);
+        }
+
+        var themeToggle = this.statusTheme.find('.ui-theme-toggle');
+
+        const checkTheme = () => {
+            var theme = this.editor.getOption('theme');
+            if (theme == "one-dark") {
+                themeToggle.removeClass('active');
+            } else {
+                themeToggle.addClass('active');
+            }
+        }
+
+        themeToggle.click(() => {
+            var theme = this.editor.getOption('theme');
+            if (theme == "one-dark") {
+                theme = "default";
+            } else {
+                theme = "one-dark";
+            }
+            this.editor.setOption('theme', theme);
+            Cookies.set('theme', theme, {
+                expires: 365
+            });
+
+            checkTheme();
+        });
+
+        checkTheme();
+    }
+
+    setSpellcheck() {
+        var cookieSpellcheck = Cookies.get('spellcheck');
+        if (cookieSpellcheck) {
+            var mode = null;
+            if (cookieSpellcheck === 'true' || cookieSpellcheck === true) {
+                mode = 'spell-checker';
+            } else {
+                mode = defaultEditorMode;
+            }
+            if (mode && mode !== this.editor.getOption('mode')) {
+                this.editor.setOption('mode', mode);
+            }
+        }
+
+        var spellcheckToggle = this.statusSpellcheck.find('.ui-spellcheck-toggle');
+
+        const checkSpellcheck = () => {
+            var mode = this.editor.getOption('mode');
+            if (mode == defaultEditorMode) {
+                spellcheckToggle.removeClass('active');
+            } else {
+                spellcheckToggle.addClass('active');
+            }
+        }
+
+        spellcheckToggle.click(() => {
+            var mode = this.editor.getOption('mode');
+            if (mode == defaultEditorMode) {
+                mode = "spell-checker";
+            } else {
+                mode = defaultEditorMode;
+            }
+            if (mode && mode !== this.editor.getOption('mode')) {
+                this.editor.setOption('mode', mode);
+            }
+            Cookies.set('spellcheck', (mode == "spell-checker"), {
+                expires: 365
+            });
+
+            checkSpellcheck();
+        });
+
+        checkSpellcheck();
+
+        //workaround spellcheck might not activate beacuse the ajax loading
+        if (window.num_loaded < 2) {
+            var spellcheckTimer = setInterval(() => {
+                if (window.num_loaded >= 2) {
+                    if (this.editor.getOption('mode') == "spell-checker") {
+                        this.editor.setOption('mode', "spell-checker");
+                    }
+                    clearInterval(spellcheckTimer);
+                }
+            }, 100);
+        }
+    }
+
+    resetEditorKeymapToBrowserKeymap() {
+        var keymap = this.editor.getOption('keyMap');
+        if (!this.jumpToAddressBarKeymapValue) {
+            this.jumpToAddressBarKeymapValue = CodeMirror.keyMap[keymap][jumpToAddressBarKeymapName];
+            delete CodeMirror.keyMap[keymap][jumpToAddressBarKeymapName];
+        }
+    }
+
+    restoreOverrideEditorKeymap() {
+        var keymap = this.editor.getOption('keyMap');
+        if (this.jumpToAddressBarKeymapValue) {
+            CodeMirror.keyMap[keymap][jumpToAddressBarKeymapName] = this.jumpToAddressBarKeymapValue;
+            this.jumpToAddressBarKeymapValue = null;
+        }
+    }
+    setOverrideBrowserKeymap() {
+        var overrideBrowserKeymap = $('.ui-preferences-override-browser-keymap label > input[type="checkbox"]');
+        if (overrideBrowserKeymap.is(":checked")) {
+            Cookies.set('preferences-override-browser-keymap', true, {
+                expires: 365
+            });
+            this.restoreOverrideEditorKeymap();
+        } else {
+            Cookies.remove('preferences-override-browser-keymap');
+            this.resetEditorKeymapToBrowserKeymap();
+        }
+    }
+
+    setPreferences() {
+        var overrideBrowserKeymap = $('.ui-preferences-override-browser-keymap label > input[type="checkbox"]');
+        var cookieOverrideBrowserKeymap = Cookies.get('preferences-override-browser-keymap');
+        if (cookieOverrideBrowserKeymap && cookieOverrideBrowserKeymap === "true") {
+            overrideBrowserKeymap.prop('checked', true);
+        } else {
+            overrideBrowserKeymap.prop('checked', false);
+        }
+        this.setOverrideBrowserKeymap();
+
+        overrideBrowserKeymap.change(() => {
+            this.setOverrideBrowserKeymap();
+        });
+    }
+
+    init(textit) {
+        this.editor = CodeMirror.fromTextArea(textit, {
+            mode: defaultEditorMode,
+            backdrop: defaultEditorMode,
+            keyMap: "sublime",
+            viewportMargin: viewportMargin,
+            styleActiveLine: true,
+            lineNumbers: true,
+            lineWrapping: true,
+            showCursorWhenSelecting: true,
+            highlightSelectionMatches: true,
+            indentUnit: 4,
+            continueComments: "Enter",
+            theme: "one-dark",
+            inputStyle: "textarea",
+            matchBrackets: true,
+            autoCloseBrackets: true,
+            matchTags: {
+                bothTags: true
+            },
+            autoCloseTags: true,
+            foldGutter: true,
+            gutters: ["CodeMirror-linenumbers", "authorship-gutters", "CodeMirror-foldgutter"],
+            extraKeys: this.defaultExtraKeys,
+            flattenSpans: true,
+            addModeClass: true,
+            readOnly: true,
+            autoRefresh: true,
+            otherCursors: true,
+            placeholder: "← Start by entering a title here\n===\nVisit /features if you don't know what to do.\nHappy hacking :)"
+        });
+
+        this.getStatusBarTemplate();
+
+        return this.editor;
+    }
+
+    getEditor() {
+        return this.editor;
+    }
+}
diff --git a/public/js/lib/editor/utils.js b/public/js/lib/editor/utils.js
new file mode 100644
index 00000000..120d3646
--- /dev/null
+++ b/public/js/lib/editor/utils.js
@@ -0,0 +1,46 @@
+const wrapSymbols = ['*', '_', '~', '^', '+', '='];
+export function wrapTextWith(editor, cm, symbol) {
+    if (!cm.getSelection()) {
+        return CodeMirror.Pass;
+    } else {
+        var ranges = cm.listSelections();
+        for (var i = 0; i < ranges.length; i++) {
+            var range = ranges[i];
+            if (!range.empty()) {
+                var from = range.from(), to = range.to();
+                if (symbol !== 'Backspace') {
+                    cm.replaceRange(symbol, to, to, '+input');
+                    cm.replaceRange(symbol, from, from, '+input');
+                    // workaround selection range not correct after add symbol
+                    var _ranges = cm.listSelections();
+                    var anchorIndex = editor.indexFromPos(_ranges[i].anchor);
+                    var headIndex = editor.indexFromPos(_ranges[i].head);
+                    if (anchorIndex > headIndex) {
+                        _ranges[i].anchor.ch--;
+                    } else {
+                        _ranges[i].head.ch--;
+                    }
+                    cm.setSelections(_ranges);
+                } else {
+                    var preEndPos = {
+                        line: to.line,
+                        ch: to.ch + 1
+                    };
+                    var preText = cm.getRange(to, preEndPos);
+                    var preIndex = wrapSymbols.indexOf(preText);
+                    var postEndPos = {
+                        line: from.line,
+                        ch: from.ch - 1
+                    };
+                    var postText = cm.getRange(postEndPos, from);
+                    var postIndex = wrapSymbols.indexOf(postText);
+                    // check if surround symbol are list in array and matched
+                    if (preIndex > -1 && postIndex > -1 && preIndex === postIndex) {
+                        cm.replaceRange("", to, preEndPos, '+delete');
+                        cm.replaceRange("", postEndPos, from, '+delete');
+                    }
+                }
+            }
+        }
+    }
+}