Teach git-status-script about git-ls-files --others

When there is non-empty $GIT_DIR/info/exclude file, use it along
with .gitignore per-directory exclude pattern files (which was
a convention agreed on the list while ago and is compatible with
Cogito) to generate a list of ignored files as well.

Signed-off-by: Junio C Hamano <junkio@cox.net>
(cherry picked from d330948a5ff0df55c2f12627c0583b4e16f1ea4d commit)

git-status-script

@@ -1,4 +1,7 @@
 #!/bin/sh
+#
+# Copyright (c) 2005 Linus Torvalds
+#
 . git-sh-setup-script || die "Not a git archive"
 
 report () {
@@ -33,10 +36,35 @@ case "$branch" in
 refs/heads/master) ;;
 *)	echo "# On branch $branch" ;;
 esac
+
 git-update-cache --refresh >/dev/null 2>&1
-git-diff-cache -M --cached HEAD | sed 's/^://' | report "Updated but not checked in" "will commit"
+
+git-diff-cache -M --cached HEAD |
+sed 's/^://' |
+report "Updated but not checked in" "will commit"
+
 committable="$?"
-git-diff-files | sed 's/^://' | report "Changed but not updated" "use git-update-cache to mark for commit"
+
+git-diff-files |
+sed 's/^://' |
+report "Changed but not updated" "use git-update-cache to mark for commit"
+
+if grep -v '^#' "$GIT_DIR/info/exclude" >/dev/null 2>&1
+then
+	git-ls-files --others \
+	    --exclude-from="$GIT_DIR/info/exclude" \
+	    --exclude-per-directory=.gitignore |
+	sed -e '
+	1i\
+#\
+# Ignored files:\
+#   (use "git add" to add to commit)\
+#
+	s/^/#	/
+	$a\
+#'
+fi
+
 if [ "$committable" == "0" ]
 then
 	echo "nothing to commit"