Support --convert . for reading code from standard input

[cpwnd]

I have an extensive xml file. It contains an xsd definition from which I generated an xml parser and class definitions via generateDS.
Now I want to use it in the git-history import.
I can also install the module manually via a setup.py, but I wanted to ask if you think adding a way to import local python modules is a good idea.

Nevertheless great tool! I have already some repos up and running :)

[simonw]

This came up in another of my projects just a few weeks ago:

• Allow passing a file of code to "sqlite-utils convert" sqlite-utils#353

simonw/sqlite-utils#353 (comment) has a workaround that should work with git-history too:

PYTHONPATH=. git-history ... --import transform

So if your module is called transform.py in the current directory the above should cause it to be imported.

[simonw]

Implementing the same solution as simonw/sqlite-utils#353 feels like a good idea to me.