Add local file provider.

src/fileAccess.nim

@@ -0,0 +1,29 @@
+import os, sets, random
+type
+  FileProvider* = ref object
+    exts: HashSet[string]
+    path*: string
+    files*: seq[string]
+
+proc load*(fp: FileProvider) =
+  ## Reload the file list
+  if fp.path == "":
+    return
+
+  for file in walkDirRec(fp.path):
+    let split = splitFile(file)
+    if fp.exts.contains(split.ext):
+      fp.files.add(file)
+  
+  randomize()
+  shuffle(fp.files)
+
+proc next*(fp: FileProvider): string = 
+  if fp.files.len < 1:
+    fp.load
+  result = fp.files[0]
+  fp.files.delete(0)
+
+proc newFileProvider*(path: string): FileProvider =
+  result = FileProvider(path: path, exts: [".png", ".jpg", ".jpeg"].toHashSet)
+  result.load