[PATCH v4] checkpatch: allow long lines containing URL

[Andreas Brauchli]

Allow lines with URL to exceed the 80 char limit for improved
interaction in adaption to ongoing but undocumented practice.

$ git grep -E '://\S{77}.*' -- '*.[ch]'

As per RFC3986 [1], the URL format allows for alphanum, +, - and .
characters in the scheme before the separator :// as long as it starts
with a letter (e.g. https, git, f.-+).

Recognition of URIs without more context information is prone to false
positives and thus currently left out of the heuristics.

$rawline is used in the check as comments are removed from $line.

[1] https://tools.ietf.org/html/rfc3986#section-3.1

Signed-off-by: Andreas Brauchli <andreas.brauchli@xxxxxxxxxxxxx>
---
 scripts/checkpatch.pl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 95cda3ecc66b..8e4c4ee9811a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2875,6 +2875,7 @@ sub process {
 #	logging functions like pr_info that end in a string
 #	lines with a single string
 #	#defines that are a single string
+#	lines with an RFC3986 like URL
 #
 # There are 3 different line length message types:
 # LONG_LINE_COMMENT	a comment starts before but extends beyond $max_line_length
@@ -2906,6 +2907,10 @@ sub process {
 				 $line =~ /^\+\s*(?:\w+)?\s*DEFINE_PER_CPU/) {
 				$msg_type = "";
 
+			# URL ($rawline is used in case the URL is in a comment)
+			} elsif ($rawline =~ /^\+.*\b[a-z][\w\.\+\-]*:\/\/\S+/i) {
+				$msg_type = "";
+
 			# Otherwise set the alternate message types
 
 			# a comment starts before $max_line_length
-- 
2.14.1