Added the notion of "virtual costs"

src/annotate.cc

@@ -122,7 +122,12 @@ void annotation_t::parse(std::istream& in)
     else if (c == '(') {
       in.get(c);
       c = static_cast<char>(in.peek());
-      if (c == '(') {
+      if (c == '@') {
+        in.clear();
+        in.seekg(pos, std::ios::beg);
+        break;
+      }
+      else if (c == '(') {
         if (value_expr)
           throw_(amount_error,
                  _("Commodity specifies more than one valuation expresion"));

src/pool.cc

@@ -246,6 +246,7 @@ cost_breakdown_t
 commodity_pool_t::exchange(const amount_t&             amount,
                            const amount_t&             cost,
                            const bool                  is_per_unit,
+                           const bool                  add_price,
                            const optional<datetime_t>& moment,
                            const optional<string>&     tag)
 {

src/pool.h

@@ -119,6 +119,7 @@ public:
   cost_breakdown_t exchange(const amount_t&             amount,
                             const amount_t&             cost,
                             const bool                  is_per_unit = false,
+                            const bool                  add_price   = true,
                             const optional<datetime_t>& moment     = none,
                             const optional<string>&     tag        = none);
 

src/post.h

@@ -58,7 +58,8 @@ public:
 #define POST_COST_CALCULATED 0x0080 // posting's cost was calculated
 #define POST_COST_IN_FULL    0x0100 // cost specified using @@
 #define POST_COST_FIXATED    0x0200 // cost is fixed using = indicator
-#define POST_ANONYMIZED      0x0400 // a temporary, anonymous posting
+#define POST_COST_VIRTUAL    0x0400 // cost is virtualized: (@)
+#define POST_ANONYMIZED      0x0800 // a temporary, anonymous posting
 
   xact_t *           xact;      // only set for posts of regular xacts
   account_t *        account;

src/py_commodity.cc

@@ -96,14 +96,15 @@ namespace {
     pool.exchange(commodity, per_unit_cost, moment);
   }
 
-  cost_breakdown_t py_exchange_5(commodity_pool_t&                  pool,
+  cost_breakdown_t py_exchange_7(commodity_pool_t&                  pool,
                                  const amount_t&                    amount,
                                  const amount_t&                    cost,
                                  const bool                         is_per_unit,
+                                 const bool                         add_prices,
                                  const boost::optional<datetime_t>& moment,
                                  const boost::optional<string>&     tag)
   {
-    return pool.exchange(amount, cost, is_per_unit, moment, tag);
+    return pool.exchange(amount, cost, is_per_unit, add_prices, moment, tag);
   }
 
   commodity_t * py_pool_getitem(commodity_pool_t& pool, const string& symbol)
@@ -280,7 +281,7 @@ void export_commodity()
 
     .def("exchange", py_exchange_2, with_custodian_and_ward<1, 2>())
     .def("exchange", py_exchange_3, with_custodian_and_ward<1, 2>())
-    .def("exchange", py_exchange_5)
+    .def("exchange", py_exchange_7)
 
     .def("parse_price_directive", &commodity_pool_t::parse_price_directive)
     .def("parse_price_expression", &commodity_pool_t::parse_price_expression,

src/textual.cc

@@ -1447,12 +1447,16 @@ post_t * instance_t::parse_post(char *          line,
 
       // Parse the optional cost (@ PER-UNIT-COST, @@ TOTAL-COST)
 
-      if (*next == '@') {
+      if (*next == '@' || (*next == '(' && *(next + 1) == '@')) {
         DEBUG("textual.parse", "line " << context.linenum << ": "
               << "Found a price indicator");
 
-        bool per_unit = true;
+        if (*next == '(') {
+          post->add_flags(POST_COST_VIRTUAL);
+          ++next;
+        }
 
+        bool per_unit = true;
         if (*++next == '@') {
           per_unit = false;
           post->add_flags(POST_COST_IN_FULL);
@@ -1460,6 +1464,9 @@ post_t * instance_t::parse_post(char *          line,
                 << "And it's for a total price");
         }
 
+        if (post->has_flags(POST_COST_VIRTUAL) && *(next + 1) == ')')
+          ++next;
+
         beg = static_cast<std::streamsize>(++next - line);
 
         p = skip_ws(next);

src/xact.cc

@@ -269,7 +269,7 @@ bool xact_base_t::finalize()
 
       cost_breakdown_t breakdown =
         commodity_pool_t::current_pool->exchange
-        (post->amount, *post->cost, false,
+        (post->amount, *post->cost, false, ! post->has_flags(POST_COST_VIRTUAL),
          datetime_t(date(), time_duration(0, 0, 0, 0)));
 
       if (post->amount.has_annotation() && post->amount.annotation().price) {