Use `os.walkDir` and an idea like:
import std / [os, sets, sequtils]
proc fileExt(dir: string; res: var Hashset[string]) =
for k, f in walkDir(dir):
if k == pcFile: res.incl splitFile(f).ext
elif k == pcDir: fileExt(f, res)
proc fileExt(dir: str
I created a mini-program to retrieve file extensions within the current
directory. However, when I intended to chain-call the apply function in a
sequence, I discovered that constructing a var T from a given T was not
possible. Consequently, I wrote a conversion function, as shown below:
