Added new post_splitter posting handler

src/filters.cc

@@ -39,8 +39,49 @@
 
 namespace ledger {
 
+void post_splitter::print_title(const value_t& val)
+{
+  if (! report.HANDLED(no_titles)) {
+    std::ostringstream buf;
+    val.print(buf);
+    post_chain->title(buf.str());
+  }
+}
+
+void post_splitter::flush()
+{
+  foreach (value_to_posts_map::value_type pair, posts_map) {
+    preflush_func(pair.first);
+    
+    foreach (post_t * post, pair.second)
+      (*post_chain)(*post);
+
+    post_chain->flush();
+    post_chain->clear();
+
+    if (postflush_func)
+      (*postflush_func)(pair.first);
+  }
+}
+
+void post_splitter::operator()(post_t& post)
+{
+  bind_scope_t bound_scope(report, post);
+  value_t      result(group_by_expr.calc(bound_scope));
+
+  value_to_posts_map::iterator i = posts_map.find(result);
+  if (i != posts_map.end()) {
+    (*i).second.push_back(&post);
+  } else {
+    std::pair<value_to_posts_map::iterator, bool> inserted
+      = posts_map.insert(value_to_posts_map::value_type(result, posts_list()));
+    assert(inserted.second);
+    (*inserted.first).second.push_back(&post);
+  }
+}
+
 pass_down_posts::pass_down_posts(post_handler_ptr handler,
-				 posts_iterator& iter)
+				 posts_iterator&  iter)
   : item_handler<post_t>(handler)
 {
   TRACE_CTOR(pass_down_posts, "post_handler_ptr, posts_iterator");

src/filters.h

@@ -50,6 +50,56 @@
 
 namespace ledger {
 
+//////////////////////////////////////////////////////////////////////
+//
+// Posting collector
+//
+
+class post_splitter : public item_handler<post_t>
+{
+public:
+  typedef std::map<value_t, posts_list> value_to_posts_map;
+  typedef function<void (const value_t&)> custom_flusher_t;
+
+protected:
+  value_to_posts_map	     posts_map;
+  report_t&		     report;
+  post_handler_ptr	     post_chain;
+  expr_t		     group_by_expr;
+  custom_flusher_t	     preflush_func;
+  optional<custom_flusher_t> postflush_func;
+
+public:
+  post_splitter(report_t&        _report,
+		post_handler_ptr _post_chain,
+		expr_t           _group_by_expr)
+    : report(_report), post_chain(_post_chain),
+      group_by_expr(_group_by_expr),
+      preflush_func(bind(&post_splitter::print_title, this, _1)) {
+    TRACE_CTOR(post_splitter, "scope_t&, post_handler_ptr, expr_t");
+  }
+  virtual ~post_splitter() {
+    TRACE_DTOR(post_splitter);
+  }
+
+  void set_preflush_func(custom_flusher_t functor) {
+    preflush_func = functor;
+  }
+  void set_postflush_func(custom_flusher_t functor) {
+    postflush_func = functor;
+  }
+
+  virtual void print_title(const value_t& val);
+
+  virtual void flush();
+  virtual void operator()(post_t& post);
+
+  virtual void clear() {
+    posts_map.clear();
+    post_chain->clear();
+  }
+};
+
 //////////////////////////////////////////////////////////////////////
 //
 // Posting filters