Add check for over-indented blocks

In a project with all lines indented 4 spaces, I noticed pycodestyle was
not catching code that was accidentally indented two levels (8 spaces).
The over indentation was unintended and can be caught during static
analysis.

Fixes #430

1 files changed, 5 insertions, 1 deletions

diff --git a/pycodestyle.py b/pycodestyle.py
index 094e24f..766e6bd 100755
--- a/pycodestyle.py
+++ b/pycodestyle.py
@@ -207,7 +207,7 @@ def tabs_or_spaces(physical_line, indent_char):
     tabs and spaces.  When using -tt these warnings become errors.
     These options are highly recommended!
 
-    Okay: if a == 0:\n        a = 1\n        b = 1
+    Okay: if a == 0:\n    a = 1\n    b = 1
     E101: if a == 0:\n        a = 1\n\tb = 1
     """
     indent = INDENT_REGEX.match(physical_line).group(1)
@@ -534,6 +534,10 @@ def indentation(logical_line, previous_logical, indent_char,
     elif not indent_expect and indent_level > previous_indent_level:
         yield 0, tmpl % (3 + c, "unexpected indentation")
 
+    expected_indent_level = previous_indent_level + 4
+    if indent_expect and indent_level > expected_indent_level:
+        yield 0, tmpl % (7, 'over-indented')
+
 
 @register_check
 def continued_indentation(logical_line, tokens, indent_level, hang_closing,