Add function to add indents in newline

Utilised getNodeIndent helper from jsx-indent-props as base-code

Author: snowypowers

lib/rules/jsx-first-prop-new-line.js

@@ -20,10 +20,50 @@ module.exports = {
     schema: [{
       enum: ['always', 'never', 'multiline', 'multiline-multiprop']
     }]
+
   },
 
   create: function (context) {
     var configuration = context.options[0];
+    var extraColumnStart = 0;
+    var indentType = 'space';
+    var indentSize = 2;
+    var sourceCode = context.getSourceCode();
+
+    if (context.options.length > 1) {
+      if (context.options[1] === 'tab') {
+        indentSize = 1;
+        indentType = 'tab';
+      } else if (typeof context.options[1] === 'number') {
+        indentSize = context.options[1];
+        indentType = 'space';
+      }
+    }
+
+    function getNodeIndent(node, byLastLine, excludeCommas) {
+      byLastLine = byLastLine || false;
+      excludeCommas = excludeCommas || false;
+
+      var src = sourceCode.getText(node, node.loc.start.column + extraColumnStart);
+      var lines = src.split('\n');
+      if (byLastLine) {
+        src = lines[lines.length - 1];
+      } else {
+        src = lines[0];
+      }
+
+      var skip = excludeCommas ? ',' : '';
+
+      var regExp;
+      if (indentType === 'space') {
+        regExp = new RegExp('^[ ' + skip + ']+');
+      } else {
+        regExp = new RegExp('^[\t' + skip + ']+');
+      }
+
+      var indent = regExp.exec(src);
+      return indent ? indent[0].length : 0;
+    }
 
     function isMultilineJSX(jsxNode) {
       return jsxNode.loc.start.line < jsxNode.loc.end.line;
@@ -42,7 +82,10 @@ module.exports = {
                 node: decl,
                 message: 'Property should be placed on a new line',
                 fix: function(fixer) {
-                  return fixer.insertTextAfter(node.name, '\n');
+                  var nodeIndent = getNodeIndent(node, false, false);
+                  var neededIndent = nodeIndent + indentSize;
+                  var insert = '\n' + Array(neededIndent + 1).join(indentType === 'space' ? ' ' : '\t');
+                  return fixer.replaceTextRange([node.name.end, decl.start], insert);
                 }
               });
             }