RE: [PATCH] checkpatch: Add some --strict coding style checks

-----Original Message-----
From: Joe Perches [mailto:joe@perches.com]
Sent: Wednesday, February 22, 2012 7:44 PM
To: Allan, Bruce W
Cc: David Miller; Andy Whitcroft; Andrew Morton;
andrei.emeltchenko.news@gmail.com; linville@tuxdriver.com; linux-
wireless@vger.kernel.org; netdev@vger.kernel.org; linux-
kernel@vger.kernel.org
Subject: RE: [PATCH] checkpatch: Add some --strict coding style checks

Hi Bruce. (yay, I got your name right)

Thanks.

How about testing this?

It allows all spaces or appropriate tabs for indentation,
and I believe it works OK.

---
 scripts/checkpatch.pl |   65
+++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 89d24b3..7a0514b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl

@@ -330,10 +330,11 @@ sub build_types {
 }
 build_types();

-our $match_balanced_parentheses = qr/(\((?:[^\(\)]+|(-1))*\))/;
+our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
+our $lval_parens = qr/(\((?:[^\(\)]+|(-1))*\))/;

 our $Typecast	= qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
-our $LvalOrFunc	=

qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};
+our $LvalOrFunc	= qr{($Lval)\s*($lval_parens{0,1})\s*};
 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};

 sub deparenthesize {

@@ -1330,6 +1331,36 @@ sub check_absolute_file {
 	}
 }

+sub pos_last_openparen {
+	my ($line) = @_;
+
+	my $pos = 0;
+
+	my $opens = $line =~ tr/\(/\(/;
+	my $closes = $line =~ tr/\)/\)/;
+
+	my $last_openparen = 0;
+
+	if (($opens == 0) || ($closes >= $opens)) {
+		return -1;
+	}
+
+	my $len = length($line);
+
+	for ($pos = 0; $pos < $len; $pos++) {
+	    my $string = substr($line, $pos);
+	    if ($string =~ /^($FuncArg|$balanced_parens)/) {
+		    $pos += length($1);
+	    }
+
+	    if (substr($line, $pos, 1) eq '(') {
+		$last_openparen = $pos;
+	    }
+	}
+
+	return $last_openparen + 1;
+}
+
 sub process {
 	my $filename = shift;

@@ -1783,6 +1814,36 @@ sub process {
 			     "please, no space before tabs\n" . $herevet);
 		}

+# check for && or || at the start of a line
+		if ($rawline =~ /^\+\s*(&&|\|\|)/) {
+			CHK("LOGICAL_CONTINUATIONS",
+			    "Logical continuations should be on the previous

line\n" . $hereprev);
+		}
+
+# check multi-line statement indentation matches previous line
+		if ($prevline =~ /^\+(\t*)(if
\(|$Ident\().*(\&\&|\|\||,)\s*$/) {
+			$prevline =~ /^\+(\t*)(.*)$/;
+			my $oldindent = $1;
+			my $rest = $2;
+
+			my $pos = pos_last_openparen($rest);
+			if ($pos >= 0) {
+				$line =~ /^\+([ \t]*)/;
+				my $newindent = $1;
+
+				my $goodtabindent = $oldindent .
+					"\t" x ($pos / 8) .
+					" "  x ($pos % 8);
+				my $goodspaceindent = $oldindent . " "  x
$pos;
+
+				if ($newindent ne $goodtabindent &&
+				    $newindent ne $goodspaceindent) {
+					CHK("PARENTHESIS_ALIGNMENT",
+					    "Alignment should match open
parenthesis\n" . $hereprev);
+				}
+			}
+		}
+
 # check for spaces at the beginning of a line.
 # Exceptions:
 #  1) within comments