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All Things Elixir @ Surge Ventures Inc, the creators of Fresha
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Files
lib/surgex/refactor/map_filenames.ex
defmodule Surgex.Refactor.MapFilenames do
@moduledoc """
Maps module names to filenames and finds non-matches.
"""
def call(filenames, opts) do
scanned = scan(filenames)
Enum.each(scanned, fn {filename, new_filename} ->
IO.puts("#{filename} => #{new_filename}")
end)
if length(scanned) == 0 do
IO.puts("No files found.")
end
if Keyword.get(opts, :fix, false) do
fixed = fix(scanned)
IO.puts("Renamed #{length(fixed)} file(s).")
fixed
else
scanned
end
end
def scan(filenames) do
filenames
|> Enum.map(&scan_map/1)
|> Enum.filter(&(&1))
end
defp scan_map(filename) do
module_match =
filename
|> File.stream!()
|> Enum.find_value(&Regex.run(~r/^defmodule ([\w.]+)/, &1))
with [_, module_name] <- module_match do
new_filename_wo_ext =
module_name
|> String.split(".")
|> List.last()
|> Macro.underscore()
new_filename = Path.join(
Path.dirname(filename),
new_filename_wo_ext <> Path.extname(filename))
if filename != new_filename do
{filename, new_filename}
end
else
_ -> nil
end
end
def fix(scanned_tuples) do
Enum.filter(scanned_tuples, fn {filename, new_filename} ->
File.rename(filename, new_filename)
true
end)
end
end