fix double comments

Author: mpetrunic

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@nodefactory/solidity-comments-core",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "",
   "main": "dist/index.js",
   "engines": {

src/index.es6

@@ -43,9 +43,23 @@ function isTab(originalLineAt) {
   return originalLineAt.startsWith('\t');
 }
 
+function hasComment(contract, line) {
+  let counter = 1;
+  while (true) {
+    counter++;
+    let lineText = contract.getOriginalLineAt(line - counter);
+    if (lineText === undefined) return false;
+    lineText = lineText.trim();
+    if (lineText.startsWith('*') || lineText.startsWith('//')) return true;
+    if (!lineText.replace(/\s/g, '').length) continue;
+    return false;
+  }
+}
+
 function insertComment(contract, node) {
   let comment = generator.generate(node);
   if (!comment) return;
+  if (hasComment(contract, node.loc.start.line)) return;
   let commentLines = comment.split('\n');
   commentLines = pad(
     node.loc.start.column,

test/index.test.es6

@@ -11,3 +11,15 @@ test('Assert generate comments from text', (t) => {
     fs.readFileSync('./test/Metacoin.commented.sol', 'utf-8')
   );
 });
+
+test('Assert generate comments from text second time wont duplicate', (t) => {
+  t.plan(1);
+  let commentedContract =
+    generateCommentsFromText(fs.readFileSync('./test/Metacoin.sol', 'utf-8'));
+  commentedContract =
+    generateCommentsFromText(commentedContract, 'utf-8');
+  t.equal(
+    commentedContract,
+    fs.readFileSync('./test/Metacoin.commented.sol', 'utf-8')
+  );
+});