Allow fixated costs, as well as prices

You can now establish a fixated price automatically by way of a fixated
cost.  The syntax for this is:

  2009/11/01 Sample
      Assets                1 apple @ =$0.10
      Equity

3 files changed, 24 insertions, 6 deletions

diff --git a/src/post.h b/src/post.h
index 51cbad64..eef58e52 100644
--- a/src/post.h
+++ b/src/post.h
@@ -52,12 +52,13 @@ class account_t;
 class post_t : public item_t
 {
 public:
-#define POST_VIRTUAL	     0x04 // the account was specified with (parens)
-#define POST_MUST_BALANCE    0x08 // posting must balance in the transaction
-#define POST_CALCULATED	     0x10 // posting's amount was calculated
-#define POST_COST_CALCULATED 0x20 // posting's cost was calculated
-#define POST_COST_IN_FULL    0x40 // cost specified using @@
-#define POST_ANONYMIZED      0x80 // a temporary, anonymous posting
+#define POST_VIRTUAL	     0x0010 // the account was specified with (parens)
+#define POST_MUST_BALANCE    0x0020 // posting must balance in the transaction
+#define POST_CALCULATED	     0x0040 // posting's amount was calculated
+#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
 
   xact_t *	     xact;	// only set for posts of regular xacts
   account_t *	     account;
diff --git a/src/textual.cc b/src/textual.cc
index 85b1a14b..dba31323 100644
--- a/src/textual.cc
+++ b/src/textual.cc
@@ -1096,6 +1096,14 @@ post_t * instance_t::parse_post(char *		line,
 	if (*p) {
 	  post->cost = amount_t();
 
+	  bool fixed_cost = false;
+	  if (*p == '=') {
+	    p++;
+	    fixed_cost = true;
+	    if (*p == '\0')
+	      throw parse_error(_("Posting is missing a cost amount"));
+	  }
+
 	  beg = p - line;
 	  ptristream cstream(p, len - beg);
 
@@ -1122,6 +1130,9 @@ post_t * instance_t::parse_post(char *		line,
 	    post->cost->in_place_negate();
 	  }
 
+	  if (fixed_cost)
+	    post->add_flags(POST_COST_FIXATED);
+
 	  DEBUG("textual.parse", "line " << linenum << ": "
 		<< "Total cost is " << *post->cost);
 	  DEBUG("textual.parse", "line " << linenum << ": "
diff --git a/src/xact.cc b/src/xact.cc
index 77a55c66..60186b1e 100644
--- a/src/xact.cc
+++ b/src/xact.cc
@@ -300,6 +300,12 @@ bool xact_base_t::finalize()
       post->amount = breakdown.amount;
       DEBUG("xact.finalize", "added breakdown, balance = " << balance);
     }
+
+    if (post->has_flags(POST_COST_FIXATED) &&
+	post->amount.has_annotation() && post->amount.annotation().price) {
+      DEBUG("xact.finalize", "fixating annotation price");
+      post->amount.annotation().add_flags(ANNOTATION_PRICE_FIXATED);
+    }
   }
 
   if (null_post != NULL) {