platform: auto-register figments, now that we have json config

src/Platform.h

@@ -54,6 +54,29 @@ class Platform : public Task {
       }
     }
 
+    struct figment_iterator: public std::iterator<std::input_iterator_tag, Figment*> {
+      TaskRegistration* cur;
+      explicit figment_iterator() : cur(NULL) {}
+      explicit figment_iterator(TaskRegistration* head) : cur(head) {
+        while (cur && !cur->task->isFigment()) {
+          cur = cur->next;
+        }
+      }
+      figment_iterator& operator++() {
+        if (cur) {
+          do {
+            cur = cur->next;
+          } while (cur && !cur->task->isFigment());
+        }
+        return *this;
+      }
+
+      figment_iterator operator++(int) {figment_iterator ret = *this; ++(*this); return ret;}
+      bool operator==(figment_iterator other) const { return cur == other.cur; }
+      bool operator!=(figment_iterator other) const { return !(*this == other); }
+      Figment* operator*() const { return static_cast<Figment*>(cur->task); }
+    };
+
     struct task_iterator: public std::iterator<std::input_iterator_tag, Task*> {
       TaskRegistration* cur;
       explicit task_iterator() : cur(NULL) {}
@@ -71,6 +94,14 @@ class Platform : public Task {
       Task* operator*() const { return cur->task; }
     };
 
+    static figment_iterator beginFigments() {
+      return figment_iterator(firstTask);
+    }
+
+    static figment_iterator endFigments() {
+      return figment_iterator(NULL);
+    }
+
     static task_iterator beginTasks() {
       return task_iterator(firstTask);
     }