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<a href="https://github.com/OpenGrok/OpenGrok/wiki/OpenGrok-Internals">From the OpenGrok internals</a>:
To get the version control history Analyzer Guru, calls his
old friend the good old History Guru. This guy is much older
than Analyzer Guru, and his silky long beard almost touches
the ground. He has several assistants called History Readers.
They just read the version control log history for a given
file and directory.
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To add support for a new SCM system you need to implement your own
known repositories in the
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