Fix absolute/relative path handling in --affected
#92
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The conditional was incorrectly reversed due to my misreading of
std::error_code
so we never attempted to look up the absolute or relative path for paths passed in to--affected
.It was a bit tricky to do unit test for absolute paths as they need to be generated beforehand. This commit is less lazy and includes unit tests for absolute and relative path handling by generating files in the CMake generation step.