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# Pleroma: A lightweight social networking server
# Originally taken from
# https://github.com/VeryBigThings/elixir_common/blob/master/lib/vbt/credo/check/consistency/file_location.ex
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Credo.Check.Consistency.FileLocation do
@moduledoc false
# credo:disable-for-this-file Credo.Check.Readability.Specs
@checkdoc """
File location should follow the namespace hierarchy of the module it defines.
Examples:
- `lib/my_system.ex` should define the `MySystem` module
- `lib/my_system/accounts.ex` should define the `MySystem.Accounts` module
"""
@explanation [warning: @checkdoc]
@special_namespaces [
"controllers",
"views",
"operations",
"channels"
]
# `use Credo.Check` required that module attributes are already defined, so we need
# to place these attributes
# before use/alias expressions.
# credo:disable-for-next-line VBT.Credo.Check.Consistency.ModuleLayout
use Credo.Check, category: :warning, base_priority: :high
alias Credo.Code
def run(source_file, params \\ []) do
case verify(source_file, params) do
:ok ->
[]
{:error, module, expected_file} ->
error(IssueMeta.for(source_file, params), module, expected_file)
end
end
defp verify(source_file, params) do
source_file.filename
|> Path.relative_to_cwd()
|> verify(Code.ast(source_file), params)
end
@doc false
def verify(relative_path, ast, params) do
if verify_path?(relative_path, params),
do: ast |> main_module() |> verify_module(relative_path, params),
else: :ok
end
defp verify_path?(relative_path, params) do
case Path.split(relative_path) do
["lib" | _] -> not exclude?(relative_path, params)
["test", "support" | _] -> false
["test", "test_helper.exs"] -> false
["test" | _] -> not exclude?(relative_path, params)
_ -> false
end
end
defp exclude?(relative_path, params) do
params
|> Keyword.get(:exclude, [])
|> Enum.any?(&String.starts_with?(relative_path, &1))
end
defp main_module(ast) do
{_ast, modules} = Macro.prewalk(ast, [], &traverse/2)
Enum.at(modules, -1)
end
defp traverse({:defmodule, _meta, args}, modules) do
[{:__aliases__, _, name_parts}, _module_body] = args
{args, [Module.concat(name_parts) | modules]}
end
defp traverse(ast, state), do: {ast, state}
# empty file - shouldn't really happen, but we'll let it through
defp verify_module(nil, _relative_path, _params), do: :ok
defp verify_module(main_module, relative_path, params) do
parsed_path = parsed_path(relative_path, params)
expected_file =
expected_file_base(parsed_path.root, main_module) <>
Path.extname(parsed_path.allowed)
cond do
expected_file == parsed_path.allowed ->
:ok
special_namespaces?(parsed_path.allowed) ->
original_path = parsed_path.allowed
namespace =
Enum.find(@special_namespaces, original_path, fn namespace ->
String.contains?(original_path, namespace)
end)
allowed = String.replace(original_path, "/" <> namespace, "")
if expected_file == allowed,
do: :ok,
else: {:error, main_module, expected_file}
true ->
{:error, main_module, expected_file}
end
end
defp special_namespaces?(path), do: String.contains?(path, @special_namespaces)
defp parsed_path(relative_path, params) do
parts = Path.split(relative_path)
allowed =
Keyword.get(params, :ignore_folder_namespace, %{})
|> Stream.flat_map(fn {root, folders} -> Enum.map(folders, &Path.join([root, &1])) end)
|> Stream.map(&Path.split/1)
|> Enum.find(&List.starts_with?(parts, &1))
|> case do
nil ->
relative_path
ignore_parts ->
Stream.drop(ignore_parts, -1)
|> Enum.concat(Stream.drop(parts, length(ignore_parts)))
|> Path.join()
end
%{root: hd(parts), allowed: allowed}
end
defp expected_file_base(root_folder, module) do
{parent_namespace, module_name} = module |> Module.split() |> Enum.split(-1)
relative_path =
if parent_namespace == [],
do: "",
else: parent_namespace |> Module.concat() |> Macro.underscore()
file_name = module_name |> Module.concat() |> Macro.underscore()
Path.join([root_folder, relative_path, file_name])
end
defp error(issue_meta, module, expected_file) do
format_issue(issue_meta,
message:
"Mismatch between file name and main module #{inspect(module)}. " <>
"Expected file path to be #{expected_file}. " <>
"Either move the file or rename the module.",
line_no: 1
)
end
end

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