Added a new --collapse-if-zero option.

src/chain.cc

@@ -92,7 +92,8 @@ xact_handler_ptr chain_xact_handlers(report_t&	      report,
     // collapse_xacts causes entries with multiple xacts to appear as entries
     // with a subtotaled xact for each commodity used.
     if (report.HANDLED(collapse))
-      handler.reset(new collapse_xacts(handler, expr));
+      handler.reset(new collapse_xacts(handler, expr,
+				       report.HANDLED(collapse_if_zero)));
 
     // subtotal_xacts combines all the xacts it receives into one subtotal
     // entry, which has one xact for each commodity in each account.

src/filters.cc

@@ -284,7 +284,16 @@ void collapse_xacts::report_subtotal()
 
   if (count == 1) {
     item_handler<xact_t>::operator()(*last_xact);
-  } else {
+  }
+  else if (only_collapse_if_zero && ! subtotal.is_zero()) {
+    foreach (xact_t * xact, component_xacts)
+      item_handler<xact_t>::operator()(*xact);
+    component_xacts.clear();
+  }
+  else {
+    if (only_collapse_if_zero)
+      component_xacts.clear();
+
     entry_temps.push_back(entry_t());
     entry_t& entry = entry_temps.back();
     entry.payee = last_entry->payee;
@@ -311,6 +320,9 @@ void collapse_xacts::operator()(xact_t& xact)
   xact.add_to_value(subtotal, amount_expr);
   count++;
 
+  if (only_collapse_if_zero)
+    component_xacts.push_back(&xact);
+
   last_entry = xact.entry;
   last_xact  = &xact;
 }

src/filters.h

@@ -381,17 +381,21 @@ class collapse_xacts : public item_handler<xact_t>
   entry_t *   last_entry;
   xact_t *    last_xact;
   account_t   totals_account;
+  bool        only_collapse_if_zero;
 
   std::list<entry_t>  entry_temps;
   std::list<xact_t>   xact_temps;
+  std::list<xact_t *> component_xacts;
 
   collapse_xacts();
 
 public:
-  collapse_xacts(xact_handler_ptr handler, expr_t& _amount_expr)
+  collapse_xacts(xact_handler_ptr handler, expr_t& _amount_expr,
+		 bool _only_collapse_if_zero = false)
     : item_handler<xact_t>(handler), amount_expr(_amount_expr),
       count(0), last_entry(NULL), last_xact(NULL),
-      totals_account(NULL, "<Total>") {
+      totals_account(NULL, "<Total>"),
+      only_collapse_if_zero(_only_collapse_if_zero) {
     TRACE_CTOR(collapse_xacts, "xact_handler_ptr");
   }
   virtual ~collapse_xacts() {

src/report.cc

@@ -388,6 +388,7 @@ option_t<report_t> * report_t::lookup_option(const char * p)
     else OPT(cleared);
     else OPT(code_as_payee);
     else OPT(collapse);
+    else OPT(collapse_if_zero);
     else OPT(comm_as_payee);
     else OPT(cost);
     else OPT_(current);

src/report.h

@@ -229,6 +229,10 @@ public:
       parent->append_display_predicate("depth<=1");
     });
 
+  OPTION_(report_t, collapse_if_zero, DO() {
+      parent->HANDLER(collapse).on();
+    });
+
   OPTION(report_t, comm_as_payee); // -x
   OPTION(report_t, cost);
   OPTION(report_t, csv_format_);