Made the id function available in post contexts

src/post.cc

@@ -141,6 +141,16 @@ namespace {
     return string_value(post.xact->payee);
   }
 
+  value_t get_magnitude(post_t& post) {
+    return post.xact->magnitude();
+  }
+  value_t get_idstring(post_t& post) {
+    return string_value(post.xact->idstring());
+  }
+  value_t get_id(post_t& post) {
+    return string_value(post.xact->id());
+  }
+
   value_t get_amount(post_t& post) {
     if (post.has_xdata() && post.xdata().has_flags(POST_EXT_COMPOUND))
       return post.xdata().compound_value;
@@ -296,6 +306,18 @@ expr_t::ptr_op_t post_t::lookup(const string& name)
       return WRAP_FUNCTOR(get_wrapper<&get_has_cost>);
     break;
 
+  case 'i':
+    if (name == "id")
+      return WRAP_FUNCTOR(get_wrapper<&get_id>);
+    else if (name == "idstring")
+      return WRAP_FUNCTOR(get_wrapper<&get_idstring>);
+    break;
+
+  case 'm':
+    if (name == "magnitude")
+      return WRAP_FUNCTOR(get_wrapper<&get_magnitude>);
+    break;
+
   case 'p':
     if (name == "post")
       return WRAP_FUNCTOR(get_wrapper<&get_this>);

src/utils.h

@@ -596,7 +596,7 @@ inline char peek_next_nonws(std::istream& in) {
     *_p = '\0';						\
   }
 
-inline string to_hex(uint_least32_t * message_digest)
+inline string to_hex(uint_least32_t * message_digest, const int len = 1)
 {
   std::ostringstream buf;
 
@@ -604,7 +604,8 @@ inline string to_hex(uint_least32_t * message_digest)
     buf.width(8);
     buf.fill('0');
     buf << std::hex << message_digest[i];
-    break;			// only output the first dword
+    if (i + 1 >= len)
+      break;			// only output the first LEN dwords
   }
   return buf.str();
 }

src/xact.cc

@@ -351,32 +351,48 @@ void xact_t::add_post(post_t * post)
   xact_base_t::add_post(post);
 }
 
+value_t xact_t::magnitude() const
+{
+  value_t halfbal = 0L;
+  foreach (const post_t * post, posts) {
+    if (post->amount.sign() > 0) {
+      if (post->cost)
+	halfbal += post->cost->number();
+      else
+	halfbal += post->amount.number();
+    }
+  }
+  return halfbal;
+}
+
+string xact_t::idstring() const
+{
+  std::ostringstream buf;
+  buf << *_date;
+  buf << payee;
+  magnitude().print(buf);
+  return buf.str();
+}
+
+string xact_t::id() const
+{
+  SHA1 sha;
+  sha.Reset();
+  sha << idstring().c_str();
+  uint_least32_t message_digest[5];
+  sha.Result(message_digest);
+  return to_hex(message_digest, 5);
+}
+
 namespace {
   value_t get_magnitude(xact_t& xact) {
-    balance_t halfbal;
-    foreach (post_t * post, xact.posts)
-      if (post->amount.sign() > 0)
-	halfbal += post->amount.number();
-    return halfbal;
+    return xact.magnitude();
   }
-
   value_t get_idstring(xact_t& xact) {
-    std::ostringstream buf;
-    buf << *xact._date;
-    buf << xact.payee;
-
-    get_magnitude(xact).print(buf);
-
-    return string_value(buf.str());
+    return string_value(xact.idstring());
   }
   value_t get_id(xact_t& xact) {
-    SHA1 sha;
-    sha.Reset();
-    sha << get_idstring(xact).as_string().c_str();
-
-    uint_least32_t message_digest[5];
-    sha.Result(message_digest);
-    return string_value(to_hex(message_digest));
+    return string_value(xact.id());
   }
 
   value_t get_code(xact_t& xact) {

src/xact.h

@@ -104,6 +104,10 @@ public:
 
   virtual void add_post(post_t * post);
 
+  value_t magnitude() const;
+  string idstring() const;
+  string id() const;
+
   virtual expr_t::ptr_op_t lookup(const string& name);
 
   virtual bool valid() const;