[PATCH] Allow whitespace before a trailer

[Rob Herring <robh@kernel.org>]

Currently, b4 fails to find and add trailers with leading whitespace. Let's
be a bit more forgiving and allow for that case.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rob Herring <robh@kernel.org>
---
This thread exhibits the problem:
https://lore.kernel.org/r/20211206174113.2295616-1-robh%40kernel.org

Note that patchwork also fails on this. Between fixing b4 or Greg, I 
went with b4. :)

---
 b4/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/b4/__init__.py b/b4/__init__.py
index 11c287eb3433..a4add56c5f80 100644
--- a/b4/__init__.py
+++ b/b4/__init__.py
@@ -1397,7 +1397,7 @@ class LoreMessage:
         was_trailer = False
         for line in body.split('\n'):
             line = line.strip('\r')
-            matches = re.search(r'^(\w\S+):\s+(\S.*)', line, flags=re.I)
+            matches = re.search(r'^\s?(\w\S+):\s+(\S.*)', line, flags=re.I)
             if matches:
                 groups = list(matches.groups())
                 # We only accept headers if we haven't seen any non-trailer lines
-- 
2.32.0