Adding new rule for enforcing new lines at the end of file, fixes #89

lib/md046.js

@@ -0,0 +1,22 @@
+// @ts-check
+
+"use strict";
+
+const shared = require("./shared");
+const { isBlankLine } = shared;
+
+module.exports = {
+  "names": [ "MD046", "new-line-eof" ],
+  "description": "New lines at the end of file",
+  "tags": [ "blank_lines" ],
+  "function": function rule(params, onError) {
+    const lastLineNumber = params.lines.length;
+    const lastLine = params.lines[lastLineNumber - 1];
+    if (!isBlankLine(lastLine)) {
+      onError({
+        "lineNumber": lastLineNumber,
+        "detail": "file does not end with new line"
+      });
+    }
+  }
+};

lib/rules.js

@@ -48,7 +48,8 @@ const rules = [
   require("./md042"),
   require("./md043"),
   require("./md044"),
-  require("./md045")
+  require("./md045"),
+  require("./md046")
 ];
 rules.forEach((rule) => {
   const name = rule.names[0].toLowerCase();