feat: support directory and empty path arguments

[arxeiss]

Closing #11

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 87.69231% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.98%. Comparing base (bd891e3) to head (13f0ec4).

Files with missing lines	Patch %	Lines
analysis/paths.go	87.09%	8 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   94.71%   92.98%   -1.73%     
==========================================
  Files           2        3       +1     
  Lines         208      271      +63     
==========================================
+ Hits          197      252      +55     
- Misses         11       19       +8     

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