Add a debug option, and one for finders. Close #6.

closure.js

@@ -23,11 +23,20 @@ var TypeManager = require('./lib/typemanager');
 
 
 var typeManager;
+var debug;
 
 
 tern.registerPlugin('closure', function(server, options) {
+  if (options.hasOwnProperty('debug')) {
+    debug = options.debug;
+  } else {
+    debug = server.options.debug;
+  }
   var finder = null;
   if (options.finder) {
+    if (!options.finder.hasOwnProperty('debug')) {
+      options.finder.debug = debug;
+    }
     var Finder;
     try {
       Finder = require('./lib/finder/' + options.finder.name);
@@ -133,6 +142,9 @@ function postParse(ast, text) {
  * @param {!infer.Scope} scope
  */
 function postInfer(ast, scope) {
+  if (debug) {
+    console.log('closure: postInfer ' + infer.cx().curOrigin);
+  }
   walk.simple(ast, {
     VariableDeclaration: function(node, scope) {
       interpretComments(node, node._closureComment,

lib/finder/grep.js

@@ -30,7 +30,7 @@ var PROVIDE_RE = /^(.+\.js):goog\.provide\(['"](\S+)['"]\);/;
  * A simple class for mapping class names to origin files which pre-populates a
  * map of names to files by delegating to grep.
  * @param {string} projectDir The Tern project directory.
- * @param {{dirs: Array.<string>}} options
+ * @param {{name: string, debug: boolean, dirs: Array.<string>}} options
  * @constructor
  */
 var GrepFileFinder = function(projectDir, options) {
@@ -44,20 +44,22 @@ var GrepFileFinder = function(projectDir, options) {
   /** @private {string} The project dir. */
   this.projectDir_ = projectDir;
 
-  this.prepopulate_(options);
+  /** @private {{name: string, debug: boolean, dirs: Array.<string>}} */
+  this.options_ = options;
+
+  this.prepopulate_();
 };
 module.exports = GrepFileFinder;
 
 
 /**
  * Pre-populates the internal file map.
- * @param {{dirs: Array.<string>}} options
  * @private
  */
-GrepFileFinder.prototype.prepopulate_ = function(options) {
+GrepFileFinder.prototype.prepopulate_ = function() {
   var dirs;
-  if (options.dirs) {
-    dirs = options.dirs;
+  if (this.options_.dirs) {
+    dirs = this.options_.dirs;
   } else {
     dirs = ['.'];
   }
@@ -74,12 +76,18 @@ GrepFileFinder.prototype.prepopulate_ = function(options) {
  */
 GrepFileFinder.prototype.searchDir_ = function(dir) {
   // TODO: Track when done prepopulating, defer calls that come in before done.
+  if (this.options_.debug) {
+    console.log('grep: searching ' + dir);
+  }
   var search = spawn('grep', ['-R', '--include=*.js', '^goog.provide(', dir]);
   search.stdout.setEncoding('utf8');
   carrier.carry(search.stdout, function(line) {
     var match = line.match(PROVIDE_RE);
     if (!match) {
       // TODO: Deal with line-wrapped goog.provide statements #7.
+      if (this.options_.debug) {
+        console.log('grep: Failed to match line ' + line);
+      }
       return;
     }
     var name = match[2];