Since the latest release of Sigasi HDT it is possible to open VHDL files from the command line. This enables you to more easily use Sigasi HDT's superior VHDL editing functionally in combination with tools like Xilinx ISE.
How to configure Sigasi HDT as default VHDL editor in Xilinx ISE?
- Click Edit > Preferences and ISE General > Editors
- Select Custom instead of ISE Text Editor