First things first: Thanks for this awesome tool! I've been looking at pretty gource-made visualizations for years (since the Google Code days) and just today got one made for my own project ActivityWatch (scripts here: https://github.com/ActivityWatch/contributor-stats/blob/master/gource-output.sh)

I made this PR since I was initially looking to submit another PR (with a feature to specify the colors for particular file types) and wanted some CI hand holding to ensure I don't break things (I'm not an expert at C++). However, I ended up discovering the custom log format where I could easily use sed to get the colors I wanted (love the log format!).

Thought the repo might need this anyway, always good to have a minimal CI setup 🙂

You can see a working run here: https://github.com/ErikBjare/Gource/runs/1581730599