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From:   Aditya Srivastava <yashsri421@gmail.com>
To:     joe@perches.com
Cc:     yashsri421@gmail.com, lukas.bulwahn@gmail.com,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org
Subject: [PATCH v5] checkpatch: add fix and improve warning msg for non-standard signature
Date:   Sun, 29 Nov 2020 00:05:08 +0530
Message-Id: <20201128183508.1195-1-yashsri421@gmail.com>
In-Reply-To: <2f5c625f5f342042ab55902fe4b808bff8dd297b.camel@perches.com>
References: <2f5c625f5f342042ab55902fe4b808bff8dd297b.camel@perches.com>
Precedence: bulk

Currently checkpatch warns for BAD_SIGN_OFF on non-standard signature
styles.

A large number of these warnings occur because of typo mistakes in
signature tags. An evaluation over v4.13..v5.8 showed that out of 539
warnings due to non-standard signatures, 87 are due to typo mistakes.

Following are the standard signature tags which are often incorrectly
used, along with their individual counts of incorrect use (over
v4.13..v5.8):

 Reviewed-by: 42
 Signed-off-by: 25
 Reported-by: 6
 Acked-by: 4
 Tested-by: 4
 Suggested-by: 4

Provide a fix by calculating levenshtein distance for the signature tag
with all the standard signatures and suggest a fix with a signature, whose
edit distance is less than or equal to 2 with the misspelled signature.

Out of the 86 mispelled signatures fixed with this approach, 85 were
found to be good corrections and 1 was bad correction.

Following was found to be a bad correction:
 Tweeted-by (count: 1) => Tested-by

Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
---
applies on next-20201120

changes in v2: modify commit message: replace specific example with overall evaluation, minor changes

changes in v3: summarize commit message

changes in v4: improve commit message; remove signature suggestions of small length (ie 'cc' and 'to')

changes in v5: modify coding styles: improve function names, whitespaces

 scripts/checkpatch.pl | 79 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 77 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index fdfd5ec09be6..e372d26d03dc 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -506,6 +506,72 @@ our $signature_tags = qr{(?xi:
 	Cc:
 )};
 
+sub edit_distance_min {
+	my (@arr) = @_;
+	my $len = scalar @arr;
+	if ((scalar @arr) < 1) {
+		# if underflow, return
+		return;
+	}
+	my $min = $arr[0];
+	for my $i (0 .. ($len-1)) {
+		if ($arr[$i] < $min) {
+			$min = $arr[$i];
+		}
+	}
+	return $min;
+}
+
+sub get_edit_distance {
+	my ($str1, $str2) = @_;
+	$str1 = lc($str1);
+	$str1 =~ s/-//g;
+	$str2 =~ s/-//g;
+	my $len1 = length($str1);
+	my $len2 = length($str2);
+	# two dimensional array storing minimum edit distance
+	my @distance;
+	for my $i (0 .. $len1) {
+		for my $j (0 .. $len2) {
+			if ($i == 0) {
+				$distance[$i][$j] = $j;
+			} elsif ($j == 0) {
+				$distance[$i][$j] = $i;
+			} elsif (substr($str1, $i-1, 1) eq substr($str2, $j-1, 1)) {
+				$distance[$i][$j] = $distance[$i - 1][$j - 1];
+			} else {
+				my $dist1 = $distance[$i][$j - 1]; #insert distance
+				my $dist2 = $distance[$i - 1][$j]; # remove
+				my $dist3 = $distance[$i - 1][$j - 1]; #replace
+				$distance[$i][$j] = 1 + edit_distance_min($dist1, $dist2, $dist3);
+			}
+		}
+	}
+	return $distance[$len1][$len2];
+}
+
+sub find_standard_signature {
+	my ($sign_off) = @_;
+	my @standard_signature_tags = (
+		'signed-off-by:', 'co-developed-by:', 'acked-by:', 'tested-by:',
+		'reviewed-by:', 'reported-by:', 'suggested-by:'
+	);
+	my $standard_signature;
+	my $min_edit_distance = 20; # setting default value
+	my $edit_distance;
+	foreach (@standard_signature_tags) {
+		$edit_distance = get_edit_distance($sign_off, $_);
+		if ($edit_distance < $min_edit_distance) {
+			$min_edit_distance = $edit_distance;
+			$standard_signature = $_;
+		}
+	}
+        if ($min_edit_distance <= 2) {
+		return ucfirst($standard_signature);
+	}
+	return "";
+}
+
 our @typeListMisordered = (
 	qr{char\s+(?:un)?signed},
 	qr{int\s+(?:(?:un)?signed\s+)?short\s},
@@ -2773,8 +2839,17 @@ sub process {
 			my $ucfirst_sign_off = ucfirst(lc($sign_off));
 
 			if ($sign_off !~ /$signature_tags/) {
-				WARN("BAD_SIGN_OFF",
-				     "Non-standard signature: $sign_off\n" . $herecurr);
+				my $suggested_signature = find_standard_signature($sign_off);
+				if ($suggested_signature eq "") {
+					WARN("BAD_SIGN_OFF",
+					     "Non-standard signature: $sign_off\n" . $herecurr);
+				} else {
+					if (WARN("BAD_SIGN_OFF",
+						 "Non-standard signature: $sign_off. Perhaps '$suggested_signature'\n" . $herecurr) &&
+					    $fix) {
+						$fixed[$fixlinenr] =~ s/$sign_off/$suggested_signature/;
+					}
+				}
 			}
 			if (defined $space_before && $space_before ne "") {
 				if (WARN("BAD_SIGN_OFF",
-- 
2.17.1