[PATCH v2 3/4] checkpatch: kconfig: enforce help text indentation

[Nicolai Fischer <nicolai.fischer@fau.de>]

Adds a new warning in case the indentation level of the
first line of a Kconfig help message is not two spaces
higher than the keyword itself.
Blank lines between the message and the help keyword
are ignored.

Co-developed-by: Johannes Czekay <johannes.czekay@fau.de>
Signed-off-by: Johannes Czekay <johannes.czekay@fau.de>
Signed-off-by: Nicolai Fischer <nicolai.fischer@fau.de>
---
 scripts/checkpatch.pl | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c86a971a3205..aa2205ee9ab8 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3313,6 +3313,8 @@ sub process {
 			my $f;
 			my $is_start = 0;
 			my $is_end = 0;
+			my $help_indent;
+			my $help_stat_real;
 			for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
 				$f = $lines[$ln - 1];
 				$cnt-- if ($lines[$ln - 1] !~ /^-/);
@@ -3323,8 +3325,10 @@ sub process {
 
 				if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate|int|hex|string|prompt)\s*(?:["'].*)?$/) {
 					$is_start = 1;
-				} elsif ($lines[$ln - 1] =~ /^\+\s*help$/) {
-					$length = -1;
+				} elsif ($lines[$ln - 1] =~ /^\+(\s*)help$/) {
+					$help_indent = $1;
+					$length = 0;
+					next;
 				}
 
 				$f =~ s/^.//;
@@ -3332,6 +3336,13 @@ sub process {
 				$f =~ s/^\s+//;
 				next if ($f =~ /^$/);
 
+				if (defined $help_indent) {
+					if ($lines[$ln - 1] !~ /^\+$help_indent\ {2}\S*/) {
+						$help_stat_real = get_stat_real($ln - 1, $ln);
+					}
+					undef $help_indent;
+				}
+
 				# This only checks context lines in the patch
 				# and so hopefully shouldn't trigger false
 				# positives, even though some of these are
@@ -3347,6 +3358,10 @@ sub process {
 				WARN("CONFIG_DESCRIPTION",
 				     "please write a paragraph that describes the config symbol fully\n" . $herecurr);
 			}
+			if ($is_start && $is_end && defined $help_stat_real) {
+				WARN("CONFIG_DESCRIPTION",
+				     "please indent the help text two spaces more than the keyword\n" . "$here\n$help_stat_real\n");
+			}
 			#print "is_start<$is_start> is_end<$is_end> length<$length>\n";
 		}
 
-- 
2.29.2