Fix files_included not being honored by Runner

when reading from stdin.

Refs #1115

lib/credo.ex

@@ -31,12 +31,14 @@ defmodule Credo do
     |> WriteDebugReport.call([])
   end
 
+  @doc false
   def run(argv_or_exec, files_that_changed) do
     argv_or_exec
     |> Execution.build(files_that_changed)
     |> Execution.run()
     |> WriteDebugReport.call([])
   end
 
+  @doc false
   def version, do: @version
 end

lib/credo/check/runner.ex

@@ -51,7 +51,21 @@ defmodule Credo.Check.Runner do
           #       but it is necessary to avoid hitting the filesystem when reading from STDIN
           [%Credo.SourceFile{filename: filename}] = Execution.get_source_files(exec)
 
-          if filename in files_excluded do
+          file_included? =
+            if files_included != [] do
+              Credo.Sources.filename_matches?(filename, files_included)
+            else
+              true
+            end
+
+          file_excluded? =
+            if files_excluded != [] do
+              Credo.Sources.filename_matches?(filename, files_excluded)
+            else
+              false
+            end
+
+          if !file_included? || file_excluded? do
             :skip_run
           else
             []

lib/credo/sources.ex

@@ -9,6 +9,41 @@ defmodule Credo.Sources do
   @default_sources_glob ~w(** *.{ex,exs})
   @stdin_filename "stdin"
 
+  @doc false
+  def filename_matches?(filename, patterns) do
+    patterns
+    |> List.wrap()
+    |> Enum.any?(&match_filename_pattern(filename, &1))
+  end
+
+  defp match_filename_pattern(filename, pattern) when is_binary(pattern) do
+    if String.contains?(pattern, "*") do
+      matches_glob_naively?(filename, pattern)
+    else
+      String.starts_with?(filename, pattern)
+    end
+  end
+
+  defp match_filename_pattern(filename, %Regex{} = pattern), do: String.match?(filename, pattern)
+
+  defp match_filename_pattern(_, pattern),
+    do: raise("Expected String or Regex, got: #{inspect(pattern)}")
+
+  # naively converts glob pattern to regex
+  # does not account for brace or tilde expansion or command substitution
+  # or anything other than * and **
+  defp matches_glob_naively?(filename, pattern) do
+    pattern
+    |> String.replace("/", "\\/")
+    |> String.replace("**", ".+")
+    |> String.replace("*", "[^\/]+")
+    |> Regex.compile()
+    |> case do
+      {:ok, regex} -> String.match?(filename, regex)
+      _ -> raise "Compiling glob pattern to regex failed: #{inspect(pattern)}"
+    end
+  end
+
   @doc """
   Finds sources for a given `Credo.Execution`.
 

test/credo/sources_test.exs

@@ -293,4 +293,21 @@ defmodule Credo.SourcesTest do
 
     assert expected == Credo.Sources.find_in_dir(dir, ["*.ex"], [~r/.ex$/])
   end
+
+  test "it matches filenames given patterns" do
+    assert Credo.Sources.filename_matches?("lib/credo/check/runner.ex", [
+             "lib/credo/check/runner.ex"
+           ])
+
+    assert Credo.Sources.filename_matches?("lib/credo/check.ex", ["lib/*/check.ex"])
+    assert Credo.Sources.filename_matches?("lib/credo/check/runner.ex", ["lib/**/runner.ex"])
+    assert Credo.Sources.filename_matches?("lib/credo/check/runner.ex", ["lib/**/*.ex"])
+
+    assert Credo.Sources.filename_matches?("lib/credo/check/foo.ex", ["lib/**/*.ex"])
+    assert Credo.Sources.filename_matches?("lib/credo/check/foo.ex", [~r/.ex$/])
+
+    refute Credo.Sources.filename_matches?("lib/credo/check/runner.ex", ["lib/*/runner.ex"])
+    refute Credo.Sources.filename_matches?("lib/credo/check/runner.ex", ["*.exs"])
+    refute Credo.Sources.filename_matches?("lib/credo/check/runner.ex", [~r/.exs$/])
+  end
 end