Rule "Put a blank line between each selector block"

index.js

@@ -14,6 +14,6 @@ postcss(plugins)
   .process(sourceCss, processOpts)
   .then(function (result) {
     result.messages.forEach(function(i) {
-      console.log('i', i);
+      console.log('-- RULE', i);
     });
   });

src/plugins.js

@@ -1,7 +1,8 @@
 var postcss = require('postcss');
 
-function LintError (msg, source, obj) {
+function LintError(msg, id, source, obj) {
   this.msg = msg;
+  this.id = id;
   this.opts = {
     line: source.start.line,
     column: source.start.column
@@ -82,8 +83,28 @@ var ensureSpaceInProperty = postcss.plugin('space-in-property', function (opts)
     };
 });
 
-module.exports = [ensureNoIndentSelectors,
-    ensureSpaceInRuleName];
+var SPC04_SpaceBeforeBracket = postcss.plugin('SPC04_SpaceBeforeBracket',
+    function(opts) {
+  opts = opts || {}; 
+
+  return function(css, result) {
+    var desired = ' ';
+    css.walkDecls(function(decl) {
+      var actual = decl.parent.raws.between;
+
+      if (actual === desired) return;
+      var e = new LintError('Put spaces before { in rule declarations.',
+        'SPC04', decl.source, decl);
+      result.warn(e.msg, e.opts);
+    });
+  };
+});
+
+module.exports = [
+  //ensureNoIndentSelectors,
+  //ensureSpaceInRuleName,
+  SPC04_SpaceBeforeBracket
+];
 //   ensureEachPropertyOwnLine,
 //   ensureSpaceInProperty,
 //   ensureNewLineBeforeRuleClosing,

test/ugly.scss

@@ -1,13 +1,13 @@
 body {
   color:     green;
 }
-.div {
+.div{
   color:blue;
 }
+/*
 .span {
   color: yellow;
 }
-/*
 @mixin fakeMixin {
   color: coral;
 }