::fixture-ready::
$ find source -type f -printf '%f\n' | sort
about.md
config.yml
index.md
logo.svg
::exit-code::0
$ find source -type f -printf '%f\n' | sed -n 's/.*\.//p' | sort | uniq -c | sort -nr
      2 md
      1 yml
      1 svg
::exit-code::0