refs: use warning() instead of fprintf(stderr, "warning: ")

diff --git a/git-submodule.sh b/git-submodule.sh
index 204aab671ef78edc24acff4019a2f40a71a59020..0a27232b90456b5471ee64d5dcf9965ad73f28af 100755 (executable)
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -167,9 +167,18 @@ cmd_add()
        ;;
        esac
 
-       # strip trailing slashes from path
-       path=$(echo "$path" | sed -e 's|/*$||')
-
+       # normalize path:
+       # multiple //; leading ./; /./; /../; trailing /
+       path=$(printf '%s/\n' "$path" |
+               sed -e '
+                       s|//*|/|g
+                       s|^\(\./\)*||
+                       s|/\./|/|g
+                       :start
+                       s|\([^/]*\)/\.\./||
+                       tstart
+                       s|/*$||
+               ')
        git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
        die "'$path' already exists in the index"