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credo
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A static code analysis tool with a focus on code consistency and teaching.
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Files
lib/credo/sources.ex
defmodule Credo.Sources do
alias Credo.SourceFile
@default_sources_glob ~w(** *.{ex,exs})
@stdin_filename "stdin"
@doc """
Finds sources for a given `Credo.Config`.
Through the `files` key, configs may contain a list of `included` and `excluded`
patterns. For `included`, patterns can be file paths, directory paths and globs.
For `excluded`, patterns can also be specified as regular expressions.
iex> Sources.find(%Credo.Config{files: %{excluded: ["not_me.ex"], included: ["*.ex"]}})
iex> Sources.find(%Credo.Config{files: %{excluded: [/messy/], included: ["lib/mix", "root.ex"]}})
"""
def find(%Credo.Config{files: %{included: [filename]}, read_from_stdin: true}) do
filename |> source_file_from_stdin() |> List.wrap
end
def find(%Credo.Config{read_from_stdin: true}) do
@stdin_filename |> source_file_from_stdin() |> List.wrap
end
def find(%Credo.Config{files: files}) do
MapSet.new
|> include(files.included)
|> exclude(files.excluded)
|> Enum.map(&to_source_file/1)
end
def find(paths) when is_list(paths) do
paths
|> Enum.flat_map(&find/1)
end
def find(path) when is_binary(path) do
path |> recurse_path()
end
defp include(files, []), do: files
defp include(files, [path | remaining_paths]) do
include_paths = recurse_path(path) |> Enum.into(MapSet.new)
files
|> MapSet.union(include_paths)
|> include(remaining_paths)
end
defp exclude(files, []), do: files
defp exclude(files, [pattern | remaining_patterns]) when is_list(files) do
files
|> Enum.into(MapSet.new)
|> exclude([pattern | remaining_patterns])
end
defp exclude(files, [pattern | remaining_patterns]) when is_binary(pattern) do
exclude_paths = recurse_path(pattern) |> Enum.into(MapSet.new)
files
|> MapSet.difference(exclude_paths)
|> exclude(remaining_patterns)
end
defp exclude(files, [pattern | remaining_patterns]) do
files
|> Enum.reject(&(String.match?(&1, pattern)))
|> exclude(remaining_patterns)
end
defp recurse_path(path) do
paths =
cond do
File.regular?(path) ->
[path]
File.dir?(path) ->
[path | @default_sources_glob]
|> Path.join
|> Path.wildcard
true ->
path
|> Path.wildcard
|> Enum.flat_map(&recurse_path/1)
end
paths |> Enum.map(&Path.expand/1)
end
defp to_source_file(filename) do
filename
|> File.read!
|> SourceFile.parse(filename)
end
defp source_file_from_stdin(filename) do
read_from_stdin!()
|> SourceFile.parse(filename)
end
defp read_from_stdin! do
{:ok, source} = read_from_stdin()
source
end
defp read_from_stdin(source \\ "") do
case IO.read(:stdio, :line) do
{:error, reason} -> {:error, reason}
:eof -> {:ok, source}
data -> source = source <> data
read_from_stdin(source)
end
end
end