Added a new valexpr function: format_date

This can be used to format dates with a specific pattern, such as:

    format_date(entry.date, "%Y/%m/%d")

This is used by the print command to ensure that Ledger is able to parse
back what it prints.

2 files changed, 11 insertions, 0 deletions

diff --git a/src/report.cc b/src/report.cc
index 1f8e4743..e1497dac 100644
--- a/src/report.cc
+++ b/src/report.cc
@@ -244,6 +244,11 @@ value_t report_t::fn_join(call_scope_t& args)
   return string_value(out.str());
 }
 
+value_t report_t::fn_format_date(call_scope_t& args)
+{
+  return string_value(format_date(args[0].to_date(), args[1].to_string()));
+}
+
 namespace {
   template <class Type        = xact_t,
 	    class handler_ptr = xact_handler_ptr,
@@ -567,6 +572,11 @@ expr_t::ptr_op_t report_t::lookup(const string& name)
       return MAKE_FUNCTOR(report_t::fn_display_total);
     break;
 
+  case 'f':
+    if (is_eq(p, "format_date"))
+      return MAKE_FUNCTOR(report_t::fn_format_date);
+    break;
+
   case 'j':
     if (is_eq(p, "join"))
       return MAKE_FUNCTOR(report_t::fn_join);
diff --git a/src/report.h b/src/report.h
index df1186ba..fd268c91 100644
--- a/src/report.h
+++ b/src/report.h
@@ -137,6 +137,7 @@ public:
   value_t fn_truncate(call_scope_t& scope);
   value_t fn_quoted(call_scope_t& scope);
   value_t fn_join(call_scope_t& scope);
+  value_t fn_format_date(call_scope_t& scope);
 
   value_t fn_options(call_scope_t& scope) {
     return value_t(static_cast<scope_t *>(this));