Deep clean the .erl files generated by yecc/leex.

When cleaning with --deps flag, iterate over dependencies and remove generated .erl files.

This feature was discussed in elixir-lang#8262.

lib/mix/lib/mix/tasks/clean.ex

@@ -36,9 +36,16 @@ defmodule Mix.Tasks.Clean do
  |> Path.join("*#{opts[:only]}")
 
  if opts[:deps] do
- build
- |> Path.wildcard()
- |> Enum.each(&File.rm_rf/1)
+ deps_paths =
+ Mix.Project.deps_paths()
+ |> Map.values()
+ |> Enum.map(&Path.join(&1, "**/*.erl"))
+
+ for path <- [build] ++ deps_paths do
+ path
+ |> Path.wildcard()
+ |> Enum.each(&File.rm_rf/1)
+ end
  else
  build
  |> Path.join("lib/#{Mix.Project.config()[:app]}")

lib/mix/test/mix/tasks/clean_test.exs

@@ -27,12 +27,14 @@ defmodule Mix.Tasks.CleanTest do
  File.mkdir_p!("_build/dev/lib/sample")
  File.mkdir_p!("_build/test/lib/sample")
  File.mkdir_p!("_build/dev/lib/ok")
+ File.touch!("deps/ok/priv/compiled.erl")
 
  Mix.Tasks.Clean.run([])
  refute File.exists?("_build/dev/lib/sample/consolidated")
  refute File.exists?("_build/dev/lib/sample")
  refute File.exists?("_build/test/lib/sample")
  assert File.exists?("_build/dev/lib/ok")
+ assert File.exists?("deps/ok/priv/compiled.erl")
  end)
  end
 
@@ -43,10 +45,12 @@ defmodule Mix.Tasks.CleanTest do
 
  Mix.Tasks.Clean.run(["--deps", "--only", "dev"])
  refute File.exists?("_build/dev")
+ refute File.exists?("deps/ok/priv/compiled.erl")
  assert File.exists?("_build/test")
 
  Mix.Tasks.Clean.run(["--deps"])
  refute File.exists?("_build/test")
+ refute File.exists?("deps/ok/priv/compiled.erl")
  end)
  end
 end