[PGA] simplify pga-create usage

src-d / datasets

source{d} datasets ("big code") for source code analysis and machine learning on source code

Other

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Closed smola closed 6 years ago

smola commented 6 years ago

create required directories upfront, this avoids errors after expensive processing is finished and results are written.
autodetect if stdin is used (--url=- not required anymore to read from stdin).
add more default arguments (--repositories, --stars and --languages are not needed anymore unless specific paths are needed).