Implemented #139: Add installing for submodules

 - (It must be ran from the root git directory.)

src/shell/install-submodules.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+: <<'LCS'
+/**
+ * @license https://raw.githubusercontent.com/andkirby/commithook/master/LICENSE.md
+ */
+LCS
+
+set -o errexit
+set -o pipefail
+set -o nounset
+#set -o xtrace
+
+# Set magic variables for current file & dir
+__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+__file="${__dir}/$(basename "${BASH_SOURCE[0]}")"
+readonly __dir __file
+
+if commithook 2>&1 > /dev/null; then
+  commithook_bin=$(type commithook | awk '{print $NF}' | tr -d "'\`")
+else
+  commithook_bin=${__dir}/../../bin/commithook
+fi
+
+current_pwd=$(pwd)
+
+submodule_paths() {
+  cat ${current_pwd}/.gitmodules \
+    | grep 'path = ' | awk '{print $3}'
+}
+
+while read module_path; do
+  cd ${module_path}
+  ${commithook_bin} install
+done < <(submodule_paths)