It depends on what you want. My solution expects the user only wants to supply the directory name and doesn't care about the internal implementation. It locks in a dependency, though, so another approach would be to accept just an object with a defined interface (dependency injection) - it's easier to test and extend.
You should start with a picture, define the behaviours of the objects, and the implementation should emerge from the design, not vice versa.
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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[d/l] |
