further python integration improvements

format.cc

@@ -438,8 +438,16 @@ bool format_account::display_account(const account_t& account,
 using namespace boost::python;
 using namespace ledger;
 
+std::string py_format_1(format_t& format, const details_t& item)
+{
+  std::ostringstream out;
+  format.format(out, item);
+  return out.str();
+}
+
 template <typename T>
-std::string py_format(format_t& format, T& item) {
+std::string py_format(format_t& format, const T& item)
+{
   std::ostringstream out;
   format.format(out, details_t(item));
   return out.str();
@@ -450,6 +458,7 @@ void export_format()
   class_< format_t > ("Format")
     .def(init<std::string>())
     .def("reset", &format_t::reset)
+    .def("format", py_format_1)
     .def("format", py_format<account_t>)
     .def("format", py_format<entry_t>)
     .def("format", py_format<transaction_t>)

main.py

@@ -16,6 +16,9 @@ add_option_handler ("goodbye", ":", goodbye)
 args = process_arguments (sys.argv[1:])
 process_environment (os.environ, "LEDGER_")
 
+if len (args) > 0:
+    config.process_options (args[0], args[1:])
+
 text_parser = TextualParser ()
 register_parser (text_parser)
 
@@ -30,14 +33,14 @@ class FormatTransaction (TransactionHandler):
     def __call__ (self, xact):
 	print self.formatter.format(xact)
 
-def foo(d, val):
-    return d.xact.amount + val
+expr = parse_value_expr ("a*2")
+
+def foo(x, val):
+    return x.xact.amount + expr.compute (x) + val
 
 handler = FormatTransaction("%D %-20P %N %('foo'{$100})")
 handler = FilterTransactions (handler, "/Checking/")
 
-expr = parse_value_expr ("a*2")
-
 for entry in journal:
     for xact in entry:
 	handler (xact)

valexpr.cc

@@ -901,14 +901,23 @@ void dump_value_expr(std::ostream& out, const value_expr_t * node)
 using namespace boost::python;
 using namespace ledger;
 
+value_t py_compute_1(value_expr_t& value_expr, const details_t& item)
+{
+  value_t result;
+  value_expr.compute(result, item);
+  return result;
+}
+
 template <typename T>
-value_t py_compute(value_expr_t& value_expr, const T& item) {
+value_t py_compute(value_expr_t& value_expr, const T& item)
+{
   value_t result;
   value_expr.compute(result, details_t(item));
   return result;
 }
 
-value_expr_t * py_parse_value_expr(const std::string& str) {
+value_expr_t * py_parse_value_expr(const std::string& str)
+{
   return parse_value_expr(str);
 }
 
@@ -929,6 +938,7 @@ void export_valexpr()
     ;
 
   class_< value_expr_t > ("ValueExpr", init<value_expr_t::kind_t>())
+    .def("compute", py_compute_1)
     .def("compute", py_compute<account_t>)
     .def("compute", py_compute<entry_t>)
     .def("compute", py_compute<transaction_t>)