switching to eslint for code checking

most rules degraded to WARN, so we don't go insane. This will
change over time. The aim is to conform to a common style

Signed-off-by: Claudius Coenen <opensource@amenthes.de>

13 files changed, 75 insertions, 44 deletions

diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 00000000..2c3d6b04
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,3 @@
+lib/ot
+public/vendor
+public/build
diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 00000000..b826a37b
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,21 @@
+module.exports = {
+  "root": true,
+  "extends": "standard",
+  "env": {
+    "node": true
+  },
+  "rules": {
+    // at some point all of these should return to their default "error" state
+    // but right now, this is not a good choice, because too many places are
+    // wrong.
+    "import/first": ["warn"],
+    "indent": ["warn"],
+    "no-multiple-empty-lines": ["warn"],
+    "no-multi-spaces": ["warn"],
+    "object-curly-spacing": ["warn"],
+    "one-var": ["warn"],
+    "quotes": ["warn"],
+    "semi": ["warn"],
+    "space-infix-ops": ["warn"]
+  }
+};
diff --git a/README.md b/README.md
index 938ba71d..6adb93d5 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,6 @@
 CodiMD
 ===
 
-[![Standard - JavaScript Style Guide][standardjs-image]][standardjs-url]
-
 [![#CodiMD on matrix.org][matrix.org-image]][matrix.org-url]
 [![build status][travis-image]][travis-url]
 [![version][github-version-badge]][github-release-page]
@@ -373,7 +371,5 @@ See more at [http://operational-transformation.github.io/](http://operational-tr
 [travis-url]: https://travis-ci.org/hackmdio/codimd
 [github-version-badge]: https://img.shields.io/github/release/hackmdio/codimd.svg
 [github-release-page]: https://github.com/hackmdio/codimd/releases
-[standardjs-image]: https://cdn.rawgit.com/feross/standard/master/badge.svg
-[standardjs-url]: https://github.com/feross/standard
 [poeditor-image]: https://img.shields.io/badge/POEditor-translate-blue.svg
 [poeditor-url]: https://poeditor.com/join/project/1OpGjF2Jir
diff --git a/lib/models/index.js b/lib/models/index.js
index 0a44ca87..ef70475e 100644
--- a/lib/models/index.js
+++ b/lib/models/index.js
@@ -25,6 +25,7 @@ if (config.dbURL) {
 // https://github.com/sequelize/sequelize/issues/6485
 function stripNullByte (value) {
   value = '' + value
+  // eslint-disable-next-line no-control-regex
   return value ? value.replace(/\u0000/g, '') : value
 }
 sequelize.stripNullByte = stripNullByte
diff --git a/lib/models/user.js b/lib/models/user.js
index 1bd8c745..2ebf6d06 100644
--- a/lib/models/user.js
+++ b/lib/models/user.js
@@ -50,7 +50,7 @@ module.exports = function (sequelize, DataTypes) {
   }, {
     instanceMethods: {
       verifyPassword: function (attempt) {
-        if (scrypt.verifyKdfSync(new Buffer(this.password, 'hex'), attempt)) {
+        if (scrypt.verifyKdfSync(Buffer.from(this.password, 'hex'), attempt)) {
           return this
         } else {
           return false
diff --git a/lib/realtime.js b/lib/realtime.js
index 8541bafa..d04ffdc2 100644
--- a/lib/realtime.js
+++ b/lib/realtime.js
@@ -242,6 +242,7 @@ function getStatus (callback) {
       }
     })
     models.User.count().then(function (regcount) {
+      // eslint-disable-next-line standard/no-callback-literal
       return callback ? callback({
         onlineNotes: Object.keys(notes).length,
         onlineUsers: Object.keys(users).length,
@@ -283,7 +284,7 @@ function extractNoteIdFromSocket (socket) {
     if (!referer) {
       return false
     }
-    var hostUrl = url.parse(referer)
+    var hostUrl = url.URL.parse(referer)
     var noteId = config.urlPath ? hostUrl.pathname.slice(config.urlPath.length + 1, hostUrl.pathname.length).split('/')[1] : hostUrl.pathname.split('/')[1]
     return noteId
   } else {
diff --git a/lib/web/imageRouter/filesystem.js b/lib/web/imageRouter/filesystem.js
index 8c432b0c..a2f8700d 100644
--- a/lib/web/imageRouter/filesystem.js
+++ b/lib/web/imageRouter/filesystem.js
@@ -16,5 +16,5 @@ exports.uploadImage = function (imagePath, callback) {
     return
   }
 
-  callback(null, url.resolve(config.serverURL + '/uploads/', path.basename(imagePath)))
+  callback(null, url.URL.resolve(config.serverURL + '/uploads/', path.basename(imagePath)))
 }
diff --git a/package.json b/package.json
index cd875ac6..bba1e36f 100644
--- a/package.json
+++ b/package.json
@@ -5,9 +5,10 @@
   "main": "app.js",
   "license": "AGPL-3.0",
   "scripts": {
-    "test": "npm run-script standard && npm run-script jsonlint",
+    "test": "npm run-script eslint && npm run-script jsonlint",
+    "eslint": "node_modules/.bin/eslint lib public app.js",
     "jsonlint": "find . -not -path './node_modules/*' -type f -name '*.json' -o -type f -name '*.json.example' | while read json; do echo $json ; jq . $json; done",
-    "standard": "node ./node_modules/standard/bin/cmd.js",
+    "standard": "echo 'standard is no longer being used, use `npm run eslint` instead!' && exit 1",
     "dev": "webpack --config webpack.dev.js --progress --colors --watch",
     "build": "webpack --config webpack.prod.js --progress --colors --bail",
     "postinstall": "bin/heroku",
@@ -169,6 +170,12 @@
     "css-loader": "^1.0.0",
     "doctoc": "^1.3.0",
     "ejs-loader": "^0.3.1",
+    "eslint": "^5.9.0",
+    "eslint-config-standard": "^12.0.0",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-node": "^8.0.0",
+    "eslint-plugin-promise": "^4.0.1",
+    "eslint-plugin-standard": "^4.0.0",
     "exports-loader": "^0.7.0",
     "expose-loader": "^0.7.5",
     "file-loader": "^2.0.0",
@@ -180,7 +187,6 @@
     "mini-css-extract-plugin": "^0.4.1",
     "optimize-css-assets-webpack-plugin": "^5.0.0",
     "script-loader": "^0.7.2",
-    "standard": "^9.0.1",
     "string-loader": "^0.0.1",
     "style-loader": "^0.21.0",
     "uglifyjs-webpack-plugin": "^1.2.7",
@@ -190,34 +196,6 @@
     "webpack-merge": "^4.1.4",
     "webpack-parallel-uglify-plugin": "^1.1.0"
   },
-  "standard": {
-    "globals": [
-      "$",
-      "CodeMirror",
-      "Cookies",
-      "moment",
-      "editor",
-      "ui",
-      "Spinner",
-      "modeType",
-      "Idle",
-      "serverurl",
-      "key",
-      "gapi",
-      "Dropbox",
-      "FilePicker",
-      "ot",
-      "MediaUploader",
-      "hex2rgb",
-      "num_loaded",
-      "Visibility",
-      "inlineAttachment"
-    ],
-    "ignore": [
-      "lib/ot",
-      "public/vendor"
-    ]
-  },
   "optionalDependencies": {
     "bufferutil": "^4.0.0",
     "utf-8-validate": "^5.0.1"
diff --git a/public/.eslintrc.js b/public/.eslintrc.js
new file mode 100644
index 00000000..dc37b3cb
--- /dev/null
+++ b/public/.eslintrc.js
@@ -0,0 +1,28 @@
+// this config file is used in concert with the root .eslintrc.js in the root dir.
+module.exports = {
+  "env": {
+    "browser": true
+  },
+  "globals": {
+    "$": false,
+    "CodeMirror": false,
+    "Cookies": false,
+    "moment": false,
+    "editor": false,
+    "ui": false,
+    "Spinner": false,
+    "modeType": false,
+    "Idle": false,
+    "serverurl": false,
+    "key": false,
+    "gapi": false,
+    "Dropbox": false,
+    "FilePicker": false,
+    "ot": false,
+    "MediaUploader": false,
+    "hex2rgb": false,
+    "num_loaded": false,
+    "Visibility": false,
+    "inlineAttachment": false
+  }
+};
diff --git a/public/js/history.js b/public/js/history.js
index b4c26b42..6007bef4 100644
--- a/public/js/history.js
+++ b/public/js/history.js
@@ -218,6 +218,7 @@ export function getStorageHistory (callback) {
     if (typeof data === 'string') { data = JSON.parse(data) }
     callback(data)
   }
+  // eslint-disable-next-line standard/no-callback-literal
   callback([])
 }
 
diff --git a/public/js/index.js b/public/js/index.js
index 98c3b6d2..0c575961 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -2511,7 +2511,9 @@ function buildCursor (user) {
 // editor actions
 function removeNullByte (cm, change) {
   var str = change.text.join('\n')
+  // eslint-disable-next-line no-control-regex
   if (/\u0000/g.test(str) && change.update) {
+    // eslint-disable-next-line no-control-regex
     change.update(change.from, change.to, str.replace(/\u0000/g, '').split('\n'))
   }
 }
@@ -3046,7 +3048,7 @@ function checkInCode () {
 function checkAbove (method) {
   var cursor = editor.getCursor()
   var text = []
-  for (var i = 0; i < cursor.line; i++) {  // contain current line
+  for (var i = 0; i < cursor.line; i++) { // contain current line
     text.push(editor.getLine(i))
   }
   text = text.join('\n') + '\n' + editor.getLine(cursor.line).slice(0, cursor.ch)
diff --git a/public/js/lib/editor/index.js b/public/js/lib/editor/index.js
index 0537e927..f05d01b8 100644
--- a/public/js/lib/editor/index.js
+++ b/public/js/lib/editor/index.js
@@ -492,7 +492,7 @@ export default class Editor {
             clearInterval(spellcheckTimer)
           }
         },
-        100,
+        100
       )
     }
   }
@@ -514,7 +514,7 @@ export default class Editor {
   }
   setOverrideBrowserKeymap () {
     var overrideBrowserKeymap = $(
-      '.ui-preferences-override-browser-keymap label > input[type="checkbox"]',
+      '.ui-preferences-override-browser-keymap label > input[type="checkbox"]'
     )
     if (overrideBrowserKeymap.is(':checked')) {
       Cookies.set('preferences-override-browser-keymap', true, {
@@ -529,10 +529,10 @@ export default class Editor {
 
   setPreferences () {
     var overrideBrowserKeymap = $(
-      '.ui-preferences-override-browser-keymap label > input[type="checkbox"]',
+      '.ui-preferences-override-browser-keymap label > input[type="checkbox"]'
     )
     var cookieOverrideBrowserKeymap = Cookies.get(
-      'preferences-override-browser-keymap',
+      'preferences-override-browser-keymap'
     )
     if (cookieOverrideBrowserKeymap && cookieOverrideBrowserKeymap === 'true') {
       overrideBrowserKeymap.prop('checked', true)
diff --git a/public/js/lib/editor/ui-elements.js b/public/js/lib/editor/ui-elements.js
index ca06d30c..29a37782 100644
--- a/public/js/lib/editor/ui-elements.js
+++ b/public/js/lib/editor/ui-elements.js
@@ -67,7 +67,7 @@ export const getUIElements = () => ({
     codemirrorScroll: $('.ui-edit-area .CodeMirror .CodeMirror-scroll'),
     codemirrorSizer: $('.ui-edit-area .CodeMirror .CodeMirror-sizer'),
     codemirrorSizerInner: $(
-      '.ui-edit-area .CodeMirror .CodeMirror-sizer > div',
+      '.ui-edit-area .CodeMirror .CodeMirror-sizer > div'
     ),
     markdown: $('.ui-view-area .markdown-body'),
     resize: {