Badly-indented code outside `--lines` range is reformatted unexpectedly

[infinitewarp]

It looks like badly-indented code is always reformatted and unexpectedly ignores the --lines range setting.

Given this test file:

def ignore_bad_indent():
  two_spaces


a=1;b=2;ingore_this_line
c=3;d=4;reformat_this_line
e=5;f=6;ignore_this_line


def ingore_another_bad_indent():
   three_spaces

running yapf /tmp/test.py --lines=6-6 produces the following output:

def ignore_bad_indent():
    two_spaces


a=1;b=2;ingore_this_line
c = 3
d = 4
reformat_this_line
e=5;f=6;ignore_this_line


def ingore_another_bad_indent():
    three_spaces

If you look closely at the diff, you can see that the indentation of lines 2 and 11 were changed unexpectedly.

/usr/bin/diff -u /tmp/test.py <(yapf /tmp/test.py --lines=6-6)
--- /tmp/test.py	2018-01-02 10:17:55.000000000 -0500
+++ /dev/fd/63	2018-01-02 10:20:58.000000000 -0500
@@ -1,11 +1,13 @@
 def ignore_bad_indent():
-  two_spaces
+    two_spaces


 a=1;b=2;ingore_this_line
-c=3;d=4;reformat_this_line
+c = 3
+d = 4
+reformat_this_line
 e=5;f=6;ignore_this_line


 def ingore_another_bad_indent():
-   three_spaces
+    three_spaces

[bwendling]

This is intentional. Because Python is sensitive to whitespace indentation, we can't just reformat a single line without ensuring that it's indentation is "correct" with regards to the surrounding code. To fix this, make sure that the coding style you choose has the same indentation style as the original code. (In this case, you're using 2 space indents while the formatting style has 4 space indents.)