Detect Git merge artifacts. These are lines starting with "<<<<<<",
"|||||||" or ">>>>>>>" followed by a space, or containing just
"=======". For "=======", exempt Markdown files, because this can be
used to underline a title, as a compromise between false negatives and
false positives.
The check-files script contains the strings "TODO" and "todo" in order to
search for files that contain TODO items. So, any check-files script would
need to be excluded from the list of files that gets checked for "TODO".
Normally, the script excludes itself from checks, but with the addition of
the crypto submodule, there is another copy of the script present from the
project root. We must avoid checking check-files scripts for TODO items.
This also helps if you run check-files from another working tree in your
working tree.
Exclude ".git" directories anywhere. This avoids spurious errors in git
checkouts that contain branch names that look like a file
check-files.py would check. Fix#1713
Exclude "mbed-os" anywhere and "examples" from the root. Switch to the
new mechanism to exclude "yotta/module". These are directories where
we store third-party files that do not need to match our preferences.
Exclude "cov-int" from the root. Fix#1691
