Adds Stylelint to lint CSS files (#32888).

Patch by Marius BALTEANU.


git-svn-id: http://svn.redmine.org/redmine/trunk@19732 e93f8b46-1217-0410-a6f0-8f06a7374b81

Author: vividtone

.gitignore

@@ -42,3 +42,5 @@
 /Gemfile.lock
 /Gemfile.local
 
+/node_modules
+yarn-error.log

.hgignore

@@ -41,3 +41,5 @@ vendor/cache
 Gemfile.lock
 Gemfile.local
 
+node_modules
+yarn-error.log

.stylelintignore

@@ -0,0 +1 @@
+public/stylesheets/jquery/jquery-ui-*.css

.stylelintrc

@@ -0,0 +1,28 @@
+{
+  "rules": {
+    "color-no-invalid-hex": true,
+    "font-family-no-duplicate-names": true,
+    "font-family-no-missing-generic-family-keyword": true,
+    "function-calc-no-invalid": true,
+    "function-calc-no-unspaced-operator": true,
+    "function-linear-gradient-no-nonstandard-direction": true,
+    "string-no-newline": true,
+    "unit-no-unknown": true,
+    "property-no-unknown": true,
+    "keyframe-declaration-no-important": true,
+    "declaration-block-no-duplicate-properties": [true, { ignore: ["consecutive-duplicates-with-different-values"] }],
+    "declaration-block-no-shorthand-property-overrides": true,
+    "block-no-empty": true,
+    "selector-pseudo-class-no-unknown": true,
+    "selector-pseudo-element-no-unknown": true,
+    "selector-type-no-unknown": true,
+    "media-feature-name-no-unknown": true,
+    "at-rule-no-unknown": true,
+    "comment-no-empty": true,
+    "no-duplicate-at-import-rules": true,
+    "no-duplicate-selectors": true,
+    "no-empty-source": true,
+    "no-extra-semicolons": true,
+    "no-invalid-double-slash-comments": true,
+  }
+}

doc/RUNNING_TESTS

@@ -80,3 +80,16 @@ Checking with RuboCop is recommended when you write patches.
 
 You can run RuboCop with:
 `bundle exec rubocop [file ...]`
+
+Running Stylelint, a static code analyzer for CSS files
+=======================================
+
+You need to have NodeJS and Yarn installed and available in your PATH:
+https://nodejs.org/en/download/package-manager/
+https://legacy.yarnpkg.com/lang/en/docs/install/#mac-stable
+
+Install Stylelint:
+`yarn install`
+
+You can run Stylelint with:
+`node_modules/.bin/stylelint "public/stylesheets/**/*.css"`

package.json

@@ -0,0 +1,6 @@
+{
+  "dependencies": {},
+  "devDependencies": {
+    "stylelint": "^13.0.0"
+  }
+}