Add --stdin-display-name to modify report output

2 files changed, 9 insertions, 0 deletions

diff --git a/flake8/main/cli.py b/flake8/main/cli.py
index b426e1e..0b50e27 100644
--- a/flake8/main/cli.py
+++ b/flake8/main/cli.py
@@ -86,6 +86,13 @@ def register_default_options(option_manager):
              'separated list. (Default: %default)',
     )
 
+    add_option(
+        '--stdin-display-name', default='stdin',
+        help='The name used when reporting errors from code passed via stdin.'
+             ' This is useful for editors piping the file contents to flake8.'
+             ' (Default: %default)',
+    )
+
     # TODO(sigmavirus24): Figure out --first/--repeat
 
     add_option(
diff --git a/flake8/style_guide.py b/flake8/style_guide.py
index 57d86b2..6be9ff6 100644
--- a/flake8/style_guide.py
+++ b/flake8/style_guide.py
@@ -237,6 +237,8 @@ class StyleGuide(object):
         """Handle an error reported by a check."""
         error = Error(code, filename, line_number, column_number, text,
                       physical_line)
+        if error.filename is None or error.filename == '-':
+            error = error._replace(filename=self.options.stdin_display_name)
         error_is_selected = (self.should_report_error(error.code) is
                              Decision.Selected)
         is_not_inline_ignored = self.is_inline_ignored(error) is False