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lib/scanner.ex
defmodule Scanner do
@moduledoc """
The `Scanner` module traverses a directory recursively, skipping hidden files
and files that should be ignored based on a `.gitignore` file. It also skips
binary files and files with a size of 0 bytes.
"""
defstruct [:root, :callback]
def new(root, callback) do
# Ensure root is full, absolute path
root = Path.expand(root)
%Scanner{
root: root,
callback: callback
}
end
# Recursive function to traverse directories
def scan(scanner, dir \\ nil) do
dir =
if is_nil(dir) do
scanner.root
else
dir
end
if not File.exists?(dir) do
{:error, "directory '#{dir}' does not exist"}
else
case File.ls(dir) do
{:error, reason} ->
{:error, "error accessing directory '#{dir}': #{reason}"}
{:ok, files} ->
Enum.each(files, fn file ->
full_path = Path.join(dir, file)
unless is_hidden_file?(full_path) or Git.is_ignored?(full_path, scanner.root) do
case File.stat(full_path) do
{:ok, %File.Stat{type: :directory}} ->
scan(scanner, full_path)
{:ok, %File.Stat{type: :regular, size: size}} when size > 0 ->
unless is_binary_file?(full_path) do
scanner.callback.(full_path)
end
{:ok, _} ->
:ok
_ ->
:ok
end
end
end)
end
end
:ok
end
# Check if the file is hidden
defp is_hidden_file?(file) do
file |> Path.basename() |> String.starts_with?(".")
end
# Check if a file is binary by reading a portion of it
defp is_binary_file?(file) do
case File.read(file) do
{:ok, content} -> String.contains?(content, <<0>>)
_ -> false
end
end
end