Merge branch 'mr/120' into 'master'

Use the lazy parameter when finding changed files with git

Closes !120

See merge request !126

1 files changed, 8 insertions, 5 deletions

diff --git a/src/flake8/main/git.py b/src/flake8/main/git.py
index 8603f67..d0c87d3 100644
--- a/src/flake8/main/git.py
+++ b/src/flake8/main/git.py
@@ -140,11 +140,14 @@ def make_temporary_directory_from(destination, directory):
 
 
 def find_modified_files(lazy):
-    diff_index = piped_process(
-        ['git', 'diff-index', '--cached', '--name-only',
-         '--diff-filter=ACMRTUXB', 'HEAD'],
-    )
-
+    diff_index_cmd = [
+        'git', 'diff-index', '--cached', '--name-only',
+        '--diff-filter=ACMRTUXB', 'HEAD'
+    ]
+    if lazy:
+        diff_index_cmd.remove('--cached')
+
+    diff_index = piped_process(diff_index_cmd)
     (stdout, _) = diff_index.communicate()
     stdout = to_text(stdout)
     return stdout.splitlines()