* Add formula support

*  Fix a bug (cannot add new operations due to bug in FormulaEditor)

src/view/grid/wxGridCellFormulaEditor.cpp

@@ -47,19 +47,41 @@ bool wxGridCellFormulaEditor::EndEdit (int row, int col, wxGrid *grid/*, const w
 {
     wxString res = GetValue();
     Operation op;
+    char* str, *str2;
+    struct parse_opt opt, *r;
     bool ret;
 
     res = res.Trim();
 
     if (res.StartsWith(wxT("=")))
+    {
+	str = (char*) std::string(res.mb_str()).c_str();
+	str2 = new char[strlen(str)];
+	strcpy(str2, str+1);
+	r = &opt;
+	str = str2;
+	try {
+	    ParseExp(&str2, r, false);
+	}
+	catch(...)
+	{
+	    wxMessageBox(_("Invalid formula !"), _("Error"), wxICON_ERROR | wxOK);	    
+	    delete str;
+	    return false;
+	}
+
+	delete str;
 	_formula = res;
+
+	ret = wxGridCellTextEditor::EndEdit(row, col, grid);
+
+	grid->SetCellValue(row, col, wxString::Format(wxT("%.2lf"), EvaluateExpr(&opt, true)));
+    }
     else
+    {
 	_formula = wxT("");
-
-    ret = wxGridCellTextEditor::EndEdit(row, col, grid);
-
-    if (_formula.Length())
-	grid->SetCellValue(row, col, wxT("0"));
+	ret = wxGridCellTextEditor::EndEdit(row, col, grid);
+    }
 
     return ret;
 }

src/view/grid/wxGridCellFormulaEditor.h

@@ -24,7 +24,7 @@
 #include <wx/grid.h>
 #include <wx/dc.h>
 #include "GridAccount.h"
-
+#include "../../ParseExp.h"
 class wxGridCellFormulaEditor : public wxGridCellTextEditor
 {
 public: