respect --expose-gc from mocha.opts

bin/_mocha

@@ -59,6 +59,9 @@ program
   .option('-d, --debug', "enable node's debugger, synonym for node --debug")
   .option('-b, --bail', "bail after first test failure")
   .option('--debug-brk', "enable node's debugger breaking on the first line")
+  .option('--expose-gc', "expose v8's garbage collector as the gc() function")
+  .option('--trace-gc', "print one trace line following each v8 garbage collection")
+  .option('--trace-gc-verbose', "print more details following each v8 garbage collection (must be used with --trace-gc-verbose)")
   .option('--globals <names>', 'allow the given comma-delimited global [names]', list, [])
   .option('--ignore-leaks', 'ignore global variable leaks')
   .option('--interfaces', 'display available interfaces')

bin/mocha

@@ -2,11 +2,27 @@
 
 /**
  * This tiny wrapper file checks for known node flags and appends them
- * when found, before invoking the "real" _mocha(1) executable.
+ * when found, before invoking the "real" _mocha(1) executable.  It will
+ * also respect known node flags set in mocha.opts
  */
 
 var spawn = require('child_process').spawn
-  , args = [ __dirname + '/_mocha' ];
+  , args = [ __dirname + '/_mocha' ]
+  , fs = require('fs');
+
+// mocha.opts support
+
+try {
+  var opts = fs.readFileSync('test/mocha.opts', 'utf8')
+    .trim()
+    .split(/\s+/);
+
+  process.argv = process.argv
+    .slice(0, 2)
+    .concat(opts.concat(process.argv.slice(2)));
+} catch (err) {
+  // ignore
+}
 
 process.argv.slice(2).forEach(function (arg) {
   switch (arg) {
@@ -22,6 +38,12 @@ process.argv.slice(2).forEach(function (arg) {
     case '--expose-gc':
       args.unshift('--expose-gc');
       break;
+    case '--trace-gc':
+      args.unshift('--trace-gc');
+      break;
+    case '--trace-gc-verbose':
+      args.unshift('--trace-gc-verbose');
+      break;
     default:
       args.push(arg);
       break;