[Test] Add stylelint checks for CSS

and embedded styles

.drone.yml

@@ -61,6 +61,10 @@ pipeline:
       - npm install
       - ./node_modules/.bin/eslint -v
       - ./node_modules/.bin/eslint ./
+      # Run stylelint checks
+      - ./node_modules/.bin/stylelint -v
+      - npm show stylelint-config-standard version
+      - ./node_modules/.bin/stylelint ./**/*.css ./**/*.html ./**/*.js
 
   # Run checks on perl source using tidyall
   perl-tidyall:

.stylelintrc.json

@@ -0,0 +1,17 @@
+{
+    "extends": "stylelint-config-standard",
+    "ignoreFiles": [
+        "**/*.min.css",
+        "**/*.min.js",
+        "interface/css/d3evolution.css",
+        "interface/css/nprogress.css"
+    ],
+    "rules": {
+        "at-rule-empty-line-before": null,
+        "color-hex-length": null,
+        "comment-empty-line-before": null,
+        "indentation": 4,
+        "number-leading-zero": null,
+        "rule-empty-line-before": null
+    }
+}

interface/css/rspamd.css

@@ -214,6 +214,7 @@ table#symbolsTable input[type="number"] {
     background-image: -ms-linear-gradient(top, #fdfdfd 0%, #eaeaea 100%);
     background-image: -o-linear-gradient(top, #fdfdfd 0%, #eaeaea 100%);
     background-image: -linear-gradient(top, #fdfdfd 0%, #eaeaea 100%);
+    /* stylelint-disable-next-line function-name-case */
     filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fdfdfd', endColorstr='#eaeaea', GradientType=0); /* IE6-9 */
     border-bottom: 1px solid #cdcdcd;
     height: 36px;

package.json

@@ -1,6 +1,8 @@
 {
     "devDependencies": {
-        "eslint": "*"
+        "eslint": "*",
+        "stylelint": "*",
+        "stylelint-config-standard": "*"
     },
     "eslintIgnore": [
         "*.min.js",