Add an option to checkwhite to change the tab size.

Since crawl coding convention use 4 spaces indentation, people using tabs
usually set them to 4 spaces. In my experience reviewing and pushing patches,
I've actually never seen any patch with tabs of 8 spaces size.

1 files changed, 7 insertions, 0 deletions

diff --git a/crawl-ref/source/util/checkwhite b/crawl-ref/source/util/checkwhite
index 78c687373e..90e088cea3 100755
--- a/crawl-ref/source/util/checkwhite
+++ b/crawl-ref/source/util/checkwhite
@@ -1,6 +1,13 @@
 #!/usr/bin/perl -w
 use Encode;
 use Text::Tabs;
+use Getopt::Std;
+
+getopt('t');
+
+if ($opt_t) {
+    $tabstop = $opt_t;
+}
 
 open FLIST, "git ls-files|" or die "Can't run git ls-files";