linux-kernel - rename_rev.pl: review script for whitespace changes

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Message-ID: <20150626131524.GQ30834@mwanda>
Date:	Fri, 26 Jun 2015 16:15:24 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	devel@...verdev.osuosl.org
Cc:	linux-kernel@...r.kernel.org
Subject: rename_rev.pl: review script for whitespace changes

I've sent my review script out a few times before but we have some new
reviewers in staging who maybe haven't tried them.

rename_rev.pl strips out whitespace changes.  We recently had someone
send a re-indent patch that deleted a line of code by mistake.  The diff
looked like:

18 files changed, 906 insertions(+), 927 deletions(-)

It would be difficult to spot the bug manually but when you cat it
through rename_rev.pl then it stands out immediately.

If the patch changes // comments to /* */ then `rename_rev.pl -nc`
strips out most of the comments.

If the patch re-indents macros then the -ns removes slashes from the
ends of lines.

Sometimes people pull out some code into a separate function.  The -pull
option is supposed to help for that.  It sometimes does...

The other thing that we see a lot in staging is when people change curly
braces around.  The -nb option removes curly brace changes.

Another thing is we had a change which did this:

-#define HOST_IF_MSG_SCAN                        ((u16)0)
-(40 lines of similar code)
+#define HOST_IF_MSG_SCAN                        0
+(40 lines of similar code)

I used rename_rev.pl -e 's/\(\(u16\)(.*)\)/$1/' to make sure nothing
else changed.

Or if you are making hundreds of functions "static", then I just remove
all the statics by doing rename_rev.pl -ea 's/static//'.  The -ea option
stands for Execute on All.

Oh.  And I am also going to include my move_rev.pl, script.  That is for
if we move functions from one file to another.

cat patch | move_rev.pl | rename_rev.pl

The rename_rev.pl script is sort of crappy, but often it removes a lot
of stuff.  It doesn't have to be perfect to be better, I guess.

What I wish is that there were an -auto option which would find which
variables were renamed.  Oh! Oh!  I have left out the most important
feature.  Say you are renaming variables from SomeName to some_name then
cat patch | rename_rev.pl SomeName some_name TwoName two_name Foo foo

regards,
dan carpenter

View attachment "rename_rev.pl" of type "text/x-perl" (5392 bytes)

View attachment "move_rev.pl" of type "text/x-perl" (3403 bytes)