How to list items in directory in Nim - nim-lang

Question

I'm currently working on an application that should be able to list out the items in a directory, however, after looking at the OS module in Nim, I couldn't find a way to see what is inside a directory. Is it possible that it hasn't been implemented yet, or did I maybe just look at the wrong place to find such a function?
So in short, how can I see what is inside /home/username/Documents/? How can I list out its content in Nim?

Answer 1

You need to look in the Iterators section of the os module.
There is walkDir and related iterators for this purpose:
iterator walkDir(dir: string; relative = false; checkDir = false): tuple[
kind: PathComponent, path: string]
Walks over the directory dir and yields for each directory or file in
dir. The component type and full path for each item are returned.
You can use it like this:
import os
for kind, path in walkDir("/home/username/Documents/"):
case kind:
of pcFile:
echo "File: ", path
of pcDir:
echo "Dir: ", path
of pcLinkToFile:
echo "Link to file: ", path
of pcLinkToDir:
echo "Link to dir: ", path

Answer 2

Recursive traversal of subfolders with filtering by extensions:
import os
import sequtils
let
targetFolder = "/home/user/media/"
targetExt = #[".mp3", ".webm", ".mkv"]
proc scanFolder (tgPath: string, extLst: seq[string]): seq[string] =
var
fileNames: seq[string]
path, name, ext: string
for kind, obj in walkDir tgPath:
if $kind == "pcDir" :
fileNames = concat(fileNames, scanFolder(obj, extLst))
(path, name, ext) = splitFile(obj)
if ext in extLst:
fileNames.add(obj)
return fileNames
var fileList = scanFolder(targetFolder, targetExt)
for f in fileList:
echo f