linux-kernel - [PATCH] checkpatch: add --fix option for OPEN

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Date:   Wed, 18 Nov 2020 18:10:35 +0530
From:   Dwaipayan Ray <dwaipayanray1@...il.com>
To:     joe@...ches.com
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        dwaipayanray1@...il.com, linux-kernel@...r.kernel.org,
        lukas.bulwahn@...il.com
Subject: [PATCH] checkpatch: add --fix option for OPEN_BRACE issues

Brace style misuses of the following types are now
corrected:

int foo(int bar,
        int baz) { bar++;
    return bar + baz;
}

int foo(int bar,
        int baz) {
    return bar + baz;
}

if (bar &&
    baz)
{   bar++;
    baz++;
}

if (bar &&
    baz)
{
    bar++;
    baz++;
}

Signed-off-by: Dwaipayan Ray <dwaipayanray1@...il.com>
---
 scripts/checkpatch.pl | 38 +++++++++++++++++++++++++++++++++-----
 1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0da6422cd0fd..8da6cde20c68 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3937,9 +3937,23 @@ sub process {
 			#print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
 
 			if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
-				ERROR("OPEN_BRACE",
-				      "that open brace { should be on the previous line\n" .
-					"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
+				if (ERROR("OPEN_BRACE",
+					  "that open brace { should be on the previous line\n" .
+						"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n") &&
+				    $fix) {
+					my $line1 = $rawlines[$ctx_ln - 2];
+					my $line2 = $rawlines[$ctx_ln - 1];
+					fix_delete_line($ctx_ln - 2, $line1);
+					fix_delete_line($ctx_ln - 1, $line2);
+
+					my $fixedline = rtrim($line1) . " {";
+					fix_insert_line($ctx_ln - 1, $fixedline);
+					$fixedline = $line2;
+					$fixedline =~ s/^(.\s*)\{\s*/$1\t/;
+					if ($fixedline !~ /^\+\s*$/) {
+						fix_insert_line($ctx_ln - 1, $fixedline);
+					}
+				}
 			}
 			if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
 			    $ctx =~ /\)\s*\;\s*$/ &&
@@ -6659,16 +6673,30 @@ sub process {
 			my $ok = 0;
 			my $cnt = statement_rawlines($stat);
 			my $herectx = $here . "\n";
+			my $cur_ln = $linenr - 1;
 			for (my $n = 0; $n < $cnt; $n++) {
 				my $rl = raw_line($linenr, $n);
 				$herectx .=  $rl . "\n";
 				$ok = 1 if ($rl =~ /^[ \+]\{/);
 				$ok = 1 if ($rl =~ /\{/ && $n == 0);
 				last if $rl =~ /^[ \+].*\{/;
+				$cur_ln++;
 			}
 			if (!$ok) {
-				ERROR("OPEN_BRACE",
-				      "open brace '{' following function definitions go on the next line\n" . $herectx);
+				if (ERROR("OPEN_BRACE",
+					  "open brace '{' following function definitions go on the next line\n" . $herectx) &&
+				    $fix && $rawlines[$cur_ln] =~ /^\+/) {
+					fix_delete_line($cur_ln, $rawlines[$cur_ln]);
+					my $fixed_line = $rawlines[$cur_ln];
+					$fixed_line =~ /(^.*\)\s*)\{(.*)$/;
+					my $line1 = rtrim($1);
+					my $line2 = $2;
+					fix_insert_line($cur_ln, $line1);
+					fix_insert_line($cur_ln, "\+{");
+					if ($line2 !~ /^\s*$/) {
+						fix_insert_line($cur_ln, "\+\t" . trim($line2));
+					}
+				}
 			}
 		}
 
-- 
2.27.0