Writing python plugins for dia looks promising.. but I really cant get a start
From going through the archives I find this
$ cat .dia/python/helloworld.py
def hello_callback(data, flags):
print "Hello, Dia!\n"
dia.register_callback("Hello",
"<Toolbox>/Help/Hello",
hello_callback)
With this, I see a Hello under Help
Remove the .../Help..." and it appears next to help in menu
However it seems to do nothing.
Ubuntu 15.4 dia 0.97.3