[PATCH] checkpatch: Warn on code with 6+ tab indentation

Joe Perches
2012-02-03T23:20:49Z

Overly indented code should be refactored.

Suggest refactoring excessive indentation of
of if/else/for/do/while/switch statements.

For example:

$ cat t.c
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{

if (1)
if (2)
if (3)
if (4)
if (5)
if (6)
if (7)
if (8)
;
return 0;
}

$ ./scripts/checkpatch.pl -f t.c
WARNING: Too many leading tabs - consider code refactoring
#12: FILE: t.c:12:
+ if (6)

WARNING: Too many leading tabs - consider code refactoring
#13: FILE: t.c:13:
+ if (7)

WARNING: Too many leading tabs - consider code refactoring
#14: FILE: t.c:14:
+ if (8)

total: 0 errors, 3 warnings, 17 lines checked

t.c has style problems, please review.

If any of these errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.

Signed-off-by: Joe Perches <joe@perches.com>
---
On Fri, 2012-02-03 at 13:27 -0800, Linus Torvalds wrote:
> So no, 100-char columns are not ok.

Perhaps this is a reasonable alternative.

Another might be to limit variable name length to something
shorter than say 10 characters.

scripts/checkpatch.pl | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2b52aeb..89d24b3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1924,6 +1924,12 @@ sub process {
my $pre_ctx = "$1$2";

my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
+
+ if ($line =~ /^\+\t{6,}/) {
+ WARN("DEEP_INDENTATION",
+ "Too many leading tabs - consider code refactoring\n" . $herecurr);
+ }
+
my $ctx_cnt = $realcnt - $#ctx - 1;
my $ctx = join("\n", @ctx);