MDL-55167 grunt: add stylelint css linting

.stylelintrc

@@ -0,0 +1,92 @@
+{
+    "rules": {
+        "at-rule-empty-line-before": [ "always",
+          {"except": [ "blockless-group", "first-nested" ], ignore: ["after-comment"]}
+        ],
+        "at-rule-name-case": "lower",
+        "at-rule-name-space-after": "always-single-line",
+        "at-rule-no-unknown": true,
+        "at-rule-semicolon-newline-after": "always",
+        "block-closing-brace-newline-after": "always",
+        "block-closing-brace-newline-before": "always-multi-line",
+        "block-closing-brace-space-before": "always-single-line",
+        "block-no-empty": true,
+        "block-no-single-line": true,
+        "block-opening-brace-newline-after": "always-multi-line",
+        "block-opening-brace-space-after": "always-single-line",
+        "block-opening-brace-space-before": "always",
+        "color-hex-case": ["lower", { "severity": "warning" }],
+        "color-hex-length": ["short", { "severity": "warning" }],
+        "color-no-invalid-hex": true,
+        "declaration-bang-space-after": "never",
+        "declaration-bang-space-before": "always",
+        "declaration-block-no-duplicate-properties": true,
+        "declaration-block-no-ignored-properties": true,
+        "declaration-block-no-shorthand-property-overrides": true,
+        "declaration-block-semicolon-newline-after": "always-multi-line",
+        "declaration-block-semicolon-space-after": "always-single-line",
+        "declaration-block-semicolon-space-before": "never",
+        "declaration-block-single-line-max-declarations": 1,
+        "declaration-block-trailing-semicolon": "always",
+        "declaration-colon-newline-after": "always-multi-line",
+        "declaration-colon-space-after": "always-single-line",
+        "declaration-colon-space-before": "never",
+        "function-calc-no-unspaced-operator": true,
+        "function-comma-newline-after": "always-multi-line",
+        "function-comma-space-after": "always-single-line",
+        "function-comma-space-before": "never",
+        "function-linear-gradient-no-nonstandard-direction": true,
+        "function-max-empty-lines": 0,
+        "function-name-case": "lower",
+        "function-parentheses-newline-inside": "always-multi-line",
+        "function-parentheses-space-inside": "never-single-line",
+        "function-url-data-uris": never,
+        "function-whitespace-after": "always",
+        "indentation": 4,
+        "keyframe-declaration-no-important": true,
+        "length-zero-no-unit": [true, { "severity": "warning" }],
+        "max-empty-lines": 2,
+        "max-line-length": [132, { "severity": "warning" }],
+        "media-feature-colon-space-after": "always",
+        "media-feature-colon-space-before": "never",
+        "media-feature-no-missing-punctuation": true,
+        "media-feature-range-operator-space-after": "always",
+        "media-feature-range-operator-space-before": "always",
+        "media-query-list-comma-newline-after": "always-multi-line",
+        "media-query-list-comma-space-after": "always-single-line",
+        "media-query-list-comma-space-before": "never",
+        "no-browser-hacks": [true, { "severity": "warning" }],
+        "no-empty-source": true,
+        "no-eol-whitespace": true,
+        "no-extra-semicolons": [true, { "severity": "warning" }],
+        "no-invalid-double-slash-comments": true,
+        "no-unknown-animations": true,
+        "property-case": "lower",
+        "selector-attribute-brackets-space-inside": "never",
+        "selector-attribute-operator-space-after": "never",
+        "selector-attribute-operator-space-before": "never",
+        "selector-combinator-space-after": "always",
+        "selector-combinator-space-before": "always",
+        "selector-list-comma-newline-after": "always",
+        "selector-list-comma-space-before": "never",
+        "selector-max-empty-lines": 0,
+        "selector-pseudo-class-case": "lower",
+        "selector-pseudo-class-no-unknown": true,
+        "selector-pseudo-class-parentheses-space-inside": "never",
+        "selector-pseudo-element-case": "lower",
+        "selector-pseudo-element-no-unknown": true,
+        "selector-root-no-composition": true,
+        "selector-type-case": "lower",
+        "selector-type-no-unknown": true,
+        "shorthand-property-no-redundant-values": [null, { "severity": "warning" }],
+        "string-no-newline": true,
+        "time-no-imperceptible": true,
+        "unit-blacklist": ["pt", "rem"],
+        "unit-case": "lower",
+        "unit-no-unknown": true,
+        "value-keyword-case": ["lower", {"ignoreKeywords": ["/@/"]}],
+        "value-list-comma-newline-after": "always-multi-line",
+        "value-list-comma-space-after": "always-single-line",
+        "value-list-comma-space-before": "never",
+  }
+}

Gruntfile.js

@@ -157,7 +157,7 @@ module.exports = function(grunt) {
             },
             bootstrapbase: {
                 files: ["theme/bootstrapbase/less/**/*.less"],
-                tasks: ["less:bootstrapbase"]
+                tasks: ["css"]
             },
             yui: {
                 files: ['**/yui/src/**/*.js'],
@@ -169,6 +169,12 @@ module.exports = function(grunt) {
                 recursive: true,
                 paths: [cwd]
             }
+        },
+        stylelint: {
+            less: {
+                options: {syntax: 'less'},
+                src: ['theme/**/*.less', '!theme/bootstrapbase/less/bootstrap/*'],
+            }
         }
     });
 
@@ -295,6 +301,7 @@ module.exports = function(grunt) {
           grunt.config('eslint.yui.src', files);
           grunt.config('uglify.amd.files', [{ expand: true, src: files, rename: uglifyRename }]);
           grunt.config('shifter.options.paths', files);
+          grunt.config('stylelint.less.src', files);
           changedFiles = Object.create(null);
     }, 200);
 
@@ -308,6 +315,7 @@ module.exports = function(grunt) {
     grunt.loadNpmTasks('grunt-contrib-less');
     grunt.loadNpmTasks('grunt-contrib-watch');
     grunt.loadNpmTasks('grunt-eslint');
+    grunt.loadNpmTasks('grunt-stylelint');
 
     // Register JS tasks.
     grunt.registerTask('shifter', 'Run Shifter against the current directory', tasks.shifter);
@@ -317,7 +325,7 @@ module.exports = function(grunt) {
     grunt.registerTask('js', ['amd', 'yui']);
 
     // Register CSS taks.
-    grunt.registerTask('css', ['less:bootstrapbase']);
+    grunt.registerTask('css', ['stylelint:less', 'less:bootstrapbase']);
 
     // Register the startup task.
     grunt.registerTask('startup', 'Run the correct tasks for the current directory', tasks.startup);