there we go

src/js/git/gitShim.js

@@ -0,0 +1,41 @@
+var _ = require('underscore');
+var Q = require('q');
+
+var Main = require('../app');
+
+function GitShim(options) {
+  options = options || {};
+  this.beforeCB = options.beforeCB || function() {};
+  this.afterCB = options.afterCB || function() {};
+
+  this.eventBaton = options.eventBaton || Main.getEventBaton();
+}
+
+GitShim.prototype.insertShim = function() {
+  console.log('stealing baton');
+  this.eventBaton.stealBaton('processGitCommand', this.processGitCommand, this);
+  console.log(this.eventBaton);
+};
+
+GitShim.prototype.processGitCommand = function(command, deferred) {
+  console.log('in before');
+  this.beforeCB();
+
+  // ok we make a NEW deferred and pass it back
+  var newDeferred = Q.defer();
+  newDeferred.promise.then(_.bind(function() {
+    // give this method the original defer so it can resolve it
+    this.afterGitCommandProcessed(command, deferred);
+  }, this));
+
+  // punt to the previous listener
+  this.eventBaton.passBatonBack('processGitCommand', this.processGitCommand, this, [command, newDeferred]);
+};
+
+GitShim.prototype.afterGitCommandProcessed = function(command, deferred) {
+  this.afterCB();
+  deferred.resolve();
+};
+
+exports.GitShim = GitShim;
+