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repo online:
http://hidamari.blue/git/git-log-calendar

example result:
http://hidamari.blue/

run with:
./git-log-calendar ~/some-repo
  -> creates: img/git-activity-$year.svg
  -> creates: img/git-discord-$dyear.svg

or run it directly with guile:
guile -e main -L . -s main.scm ~/git-directory

run with --help for more info