Add MD012, MD028 with tests, support multiple markers by line.

lib/rules.js

@@ -212,6 +212,45 @@ module.exports = [
     }
   },
 
+  {
+    "name": "MD012",
+    "desc": "Multiple consecutive blank lines",
+    "func": function MD012(params, errors) {
+      var exclusions = [];
+      params.tokens.filter(function filterToken(token) {
+        return ((token.type === "code_block") || (token.type === "fence"));
+      }).forEach(function forToken(token) {
+        for (var i = token.lines[0] ; i < token.lines[1] ; i++) {
+          exclusions.push(i);
+        }
+      });
+      var prevLine = "-";
+      params.lines.forEach(function forLine(line, lineIndex) {
+        line = line.trim();
+        if (!line.length && !prevLine.length &&
+            (exclusions.indexOf(lineIndex) === -1)) {
+          errors.push(lineIndex + 1);
+        }
+        prevLine = line;
+      });
+    }
+  },
+
+  {
+    "name": "MD028",
+    "desc": "Blank line inside blockquote",
+    "func": function MD028(params, errors) {
+      var prevToken = {};
+      params.tokens.forEach(function forToken(token) {
+        if ((token.type === "blockquote_open") &&
+            (prevToken.type === "blockquote_close")) {
+          errors.push(token.lineNumber - 1);
+        }
+        prevToken = token;
+      });
+    }
+  },
+
   {
     "name": "MD031",
     "desc": "Fenced code blocks should be surrounded by blank lines",

test/blockquote_blank_lines.md

@@ -0,0 +1,31 @@
+Some text
+
+> a quote
+> same quote
+
+> blank line above me
+
+
+> two blank lines above me
+ 
+> space above me
+
+* List with embedded blockquote
+
+  > Test
+  > Test
+
+  > Test
+
+* Item 2
+
+  > Test. The blank line below should _not_ trigger MD028 as one blockquote is
+  > inside the list, and the other is outside it.
+
+> Test
+
+Expected errors:
+
+{MD028:5} {MD028:8} {MD028:10} {MD028:17}
+{MD009:10} (trailing space is intentional)
+{MD012:8} (multiple blank lines are intentional)

test/consecutive_blank_lines.md

@@ -0,0 +1,11 @@
+Some text
+
+
+Some text {MD012:3}
+
+    This is a code block
+
+
+    with two blank lines in it
+
+Some more text

test/markdownlint-test.js

@@ -34,11 +34,12 @@ function createTestForFile(file) {
           var lines = contents.split(/\r\n|\r|\n/g);
           var results = {};
           lines.forEach(function forLine(line, lineNum) {
-            var match = line.match(/\{(MD\d+)(?::(\d+))?\}/);
-            if (match) {
+            var regex = /\{(MD\d+)(?::(\d+))?\}/g;
+            var match;
+            while ((match = regex.exec(line))) {
               var rule = match[1];
               var errors = results[rule] || [];
-              errors.push(lineNum + 1);
+              errors.push(match[2] ? parseInt(match[2], 10) : lineNum + 1);
               results[rule] = errors;
             }
           });