Add bin directory

bin/git-sm-commit

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -o nounset
+
+submodule_count=$(git diff --staged --submodule=log | grep -c '^Submodule')
+
+if (( $submodule_count == 1 )) ; then
+    msg="Update submodule $(git diff --staged --submodule=log | grep '^Submodule' | cut -d ' ' -f 2)"
+else
+    msg="Update submodules"
+fi
+
+git commit --edit --no-status \
+    --message="$msg" \
+    --message "$(git diff --staged --color=never --submodule=log | sed 's/^S/\nS/' | sed 's/^Submodule /* /' | sed 's/  >/  */')"