How to notify a user that the file is read-only

Today komodo (9.0.0) opens a read-only file without any notification. User can write his code for hours and only when try to save them gets a ‘can not write’ note.
Gvim, for example, echoes an warning message before editing the read-only file. Emacs does not allow edition at all.
How to add any kind of notification before user tries to edit a read-only file?
I talk about Linux RH6 system.
–thanks…

I see this feature was discussed years ago:
http://osdir.com/ml/ide.komodo.general/2004-06/msg00011.html

Please file an enhancement request on our bug tracker: https://github.com/Komodo/KomodoEdit/issues