add debug logging

Author: eush77

index.js

@@ -3,8 +3,13 @@
 var parseSelector = require('./lib/selector')(),
     select = require('./lib/select');
 
+var debug = require('debug')('unist-util-select');
+
 
 module.exports = function (ast, selector) {
+  debug('Selector: %j', selector);
   selector = parseSelector(selector);
+  debug('AST: %s',
+        JSON.stringify(selector, null, 2).replace(/(^|\n)/g, '\n    '));
   return selector ? select[selector.type](selector, ast) : [];
 };

package.json

@@ -40,7 +40,8 @@
     "walk"
   ],
   "dependencies": {
-    "css-selector-parser": "^1.1.0"
+    "css-selector-parser": "^1.1.0",
+    "debug": "^2.2.0"
   },
   "devDependencies": {
     "tape": "^4.2.0"