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lib/dir_stream.ex
defmodule DirStream do
@doc """
Creates a stream that lazily traverses the given directory recursively.
The `continue?` callback allows the caller to control traversal. It is called
with each directory path before traversing its contents. If it returns
`false`, the directory is skipped.
## Parameters:
- `path` (String): The root directory to traverse.
- `continue?` (Function, optional): A function `(String.t() -> boolean)`
that determines whether to continue traversing a directory.
Defaults to always continuing.
## Returns:
- A `Stream` that yields file paths.
"""
def new(path, continue? \\ fn _ -> true end) when is_function(continue?, 1) do
Stream.resource(
# Initialize with the root directory
fn -> [path] end,
# Fetch the next batch of files/directories
&next_paths(&1, continue?),
# Cleanup is a no-op
fn _ -> :ok end
)
end
defp next_paths([], _continue?), do: {:halt, []}
defp next_paths([current_path | rest_paths], continue?) do
case File.ls(current_path) do
{:ok, entries} ->
full_paths =
entries
|> Enum.map(&Path.join(current_path, &1))
|> Enum.map(&Path.expand/1)
# Separate files and directories
{files, dirs} = Enum.split_with(full_paths, &File.regular?/1)
# Check whether to continue traversing directories
dirs_to_traverse =
Enum.filter(dirs, continue?)
# Return files as the current chunk and add selected dirs to the queue
{files, dirs_to_traverse ++ rest_paths}
{:error, _reason} ->
# Skip unreadable paths
next_paths(rest_paths, continue?)
end
end
end