diff --git a/CPPLINT.cfg b/CPPLINT.cfg
new file mode 100644
index 0000000..95cd94f
--- /dev/null
+++ b/CPPLINT.cfg
@@ -0,0 +1,2 @@
+set noparent
+filter=-build/c++11
diff --git a/scripts/init.sh b/scripts/init.sh
index c034f3e..ce193c2 100755
--- a/scripts/init.sh
+++ b/scripts/init.sh
@@ -14,181 +14,29 @@
 # limitations under the License.
 
 # _VERBOSE_=1
+# _INIT_LINTER_=1
 # _FORCE_INSRALL_=1
 
 BASE_DIR=$(cd "$(dirname "$0")" && pwd)
 
-source "$BASE_DIR/common/echo.sh"
-source "$BASE_DIR/common/detect.sh"
-source "$BASE_DIR/common/host.sh"
-
-PYTHON="python"
-if [ "$HOST_OS" = "Win" ]; then
-  if ! _detect_cmd $PYTHON; then
-    PYTHON="python2"  # try python2 on MSYS
-  fi
-fi
-
-_detect $PYTHON 1
-
-PYTHON_FOUND="${PYTHON}_FOUND"
-if [ -z "${!PYTHON_FOUND}" ]; then
-  _echo_en "$PYTHON not found"
-fi
-
-if [ "$HOST_OS" = "Linux" ]; then
-  _detect_install() {
-    _detect_cmd "$1" || [ $(dpkg-query -W -f='${Status}' "$1" 2> /dev/null \
-        | grep -c "ok installed") -gt 0 ]
-  }
-elif [ "$HOST_OS" = "Mac" ]; then
-  _detect_install() {
-    _detect_cmd "$1" || brew ls --versions "$1" > /dev/null
-  }
-else
-  _detect_install() {
-    _detect_cmd "$1"
-  }
-fi
-
-_install_deps() {
-  _cmd="$1"; shift; _deps_all=($@)
-  _echo "Install cmd: $_cmd"
-  _echo "Install deps: ${_deps_all[*]}"
-  if [ -n "${_FORCE_INSRALL_}" ]; then
-    _echo_d "$_cmd ${_deps_all[*]}"
-    $_cmd ${_deps_all[@]}
-    return
-  fi
-  _deps=()
-  for _dep in "${_deps_all[@]}"; do
-    _detect_install $_dep || _deps+=($_dep)
-  done
-  if [ ${#_deps[@]} -eq 0 ]; then
-    _echo_i "All deps already exist"
-  else
-    _echo_d "$_cmd ${_deps[*]} (not exists)"
-    $_cmd ${_deps[@]}
-  fi
-}
+source "$BASE_DIR/init_tools.sh"
 
 ## deps
 
 _echo_s "Init deps"
 
 if [ "$HOST_OS" = "Linux" ]; then
-  # detect apt-get
-  _detect apt-get
-  # apt-get install
-  _install_deps "sudo apt-get install" build-essential curl cmake git clang-format
-  _install_deps "sudo apt-get install" libv4l-dev
-  if ! _detect_cmd clang-format; then
-    # on Ubuntu 14.04, apt-cache search clang-format
-    _install_deps "sudo apt-get install" clang-format-3.9
-    sudo ln -sf clang-format-3.9 /usr/bin/clang-format
-    sudo ln -sf clang-format-diff-3.9 /usr/bin/clang-format-diff
-  fi
-  # sudo
-  SUDO="sudo"
+  _install_deps "$SUDO apt-get install" libv4l-dev
 elif [ "$HOST_OS" = "Mac" ]; then
-  # detect brew
-  if ! _detect_cmd brew; then
-    _echo_sn "Install brew"
-    _detect curl
-    _detect ruby
-    ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
-  fi
-  # brew install
-  _install_deps "brew install" curl cmake git clang-format
-  # link clang-format-diff (if not compatible with Python 3, fix it by yourself)
-  [ -f "/usr/local/bin/clang-format-diff" ] || \
-    ln -s /usr/local/share/clang/clang-format-diff.py /usr/local/bin/clang-format-diff
   _install_deps "brew install" libuvc
 elif [ "$HOST_OS" = "Win" ]; then
-  # detect pacman on MSYS
-  _detect pacman
-  # pacman install (common)
-  _install_deps "pacman -S" curl git clang-format
-  if [ "$HOST_NAME" = "MINGW" ]; then
-    # pacman install (MINGW)
-    _deps=()
-    if [ "$HOST_ARCH" = "x64" ]; then
-      _deps+=(mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake)
-    elif [ "$HOST_ARCH" = "x86" ]; then
-      _deps+=(mingw-w64-i686-toolchain mingw-w64-i686-cmake)
-    else
-      _echo_e "Unknown host arch :("
-      exit 1
-    fi
-    if ! [ ${#_deps[@]} -eq 0 ]; then
-      _echo_d "pacman -S ${_deps[*]}"
-      pacman -S ${_deps[@]}
-    fi
-  else
-    # detect cmake on MSYS
-    _detect cmake
-  fi
-  # update
-  #   pacman -Syu
-  # search
-  #   pacman -Ss make
-  # autoremove
-  #   pacman -Qtdq | pacman -Rs -
+  # _install_deps "pacman -S" ?
+  _echo
 else  # unexpected
   _echo_e "Unknown host os :("
   exit 1
 fi
 
-## pip
-
-# detect pip
-if ! _detect_cmd pip; then
-  if [ -n "${!PYTHON_FOUND}" ]; then
-    _echo_sn "Install pip"
-    [ -f "get-pip.py" ] || curl -O https://bootstrap.pypa.io/get-pip.py
-    $SUDO $PYTHON get-pip.py
-  else
-    _echo_en "Skipped install pip, as $PYTHON not found"
-  fi
-fi
-# pip install
-if _detect_cmd pip; then
-  _echo_d "pip install --upgrade autopep8 cpplint pylint requests"
-  $SUDO pip install --upgrade autopep8 cpplint pylint requests
-else
-  _echo_en "Skipped pip install packages, as pip not found"
-fi
-
-## realpath
-
-# detect realpath
-if ! _detect_cmd realpath; then
-  _echo_sn "Install realpath"
-  if [ "$HOST_OS" = "Linux" ]; then
-    # How to install realpath on Ubuntu 14.04
-    #   https://www.howtoinstall.co/en/ubuntu/trusty/realpath
-    sudo apt-get install coreutils realpath
-  elif [ "$HOST_OS" = "Mac" ]; then
-    brew install coreutils
-  elif [ "$HOST_OS" = "Win" ]; then
-    pacman -S coreutils
-  else  # unexpected
-    _echo_e "Unknown host os :("
-    exit 1
-  fi
-fi
-
-ROOT_DIR=$(realpath "$BASE_DIR/..")
-
-## init
-
-if [ -n "${!PYTHON_FOUND}" ]; then
-  _echo_s "Init git hooks"
-  $PYTHON "$ROOT_DIR/tools/linter/init-git-hooks.py"
-else
-  _echo_en "Skipped init git hooks, as $PYTHON not found"
-fi
-
 ## cmake version
 
 _echo_s "Expect cmake version >= 3.0"
diff --git a/scripts/init_tools.sh b/scripts/init_tools.sh
new file mode 100644
index 0000000..232b536
--- /dev/null
+++ b/scripts/init_tools.sh
@@ -0,0 +1,214 @@
+#!/usr/bin/env bash
+# Copyright 2018 Slightech Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+_INIT_BUILD_=1
+# _INIT_LINTER_=1
+# _FORCE_INSRALL_=1
+
+BASE_DIR=$(cd "$(dirname "$0")" && pwd)
+
+source "$BASE_DIR/common/echo.sh"
+source "$BASE_DIR/common/detect.sh"
+source "$BASE_DIR/common/host.sh"
+
+## functions
+
+if [ "$HOST_OS" = "Linux" ]; then
+  _detect_install() {
+    _detect_cmd "$1" || [ $(dpkg-query -W -f='${Status}' "$1" 2> /dev/null \
+        | grep -c "ok installed") -gt 0 ]
+  }
+elif [ "$HOST_OS" = "Mac" ]; then
+  _detect_install() {
+    _detect_cmd "$1" || brew ls --versions "$1" > /dev/null
+  }
+else
+  _detect_install() {
+    _detect_cmd "$1"
+  }
+fi
+
+_install_deps() {
+  _cmd="$1"; shift; _deps_all=($@)
+  _echo "Install cmd: $_cmd"
+  _echo "Install deps: ${_deps_all[*]}"
+  if [ -n "${_FORCE_INSRALL_}" ]; then
+    _echo_d "$_cmd ${_deps_all[*]}"
+    $_cmd ${_deps_all[@]}
+    return
+  fi
+  _deps=()
+  for _dep in "${_deps_all[@]}"; do
+    _detect_install $_dep || _deps+=($_dep)
+  done
+  if [ ${#_deps[@]} -eq 0 ]; then
+    _echo_i "All deps already exist"
+  else
+    _echo_d "$_cmd ${_deps[*]} (not exists)"
+    $_cmd ${_deps[@]}
+  fi
+}
+
+## init tools
+
+_echo_s "Init tools"
+
+if [ "$HOST_OS" = "Linux" ]; then
+  # sudo
+  SUDO="sudo"
+  # detect apt-get
+  _detect apt-get
+  # apt-get install
+  if [ -n "${_INIT_BUILD_}" ]; then
+    _install_deps "$SUDO apt-get install" build-essential curl cmake git make
+  fi
+  if [ -n "${_INIT_LINTER_}" ]; then
+    _install_deps "$SUDO apt-get install" clang-format
+    if ! _detect_cmd clang-format; then
+      # on Ubuntu 14.04, apt-cache search clang-format
+      _install_deps "$SUDO apt-get install" clang-format-3.9
+      $SUDO ln -sf clang-format-3.9 /usr/bin/clang-format
+      $SUDO ln -sf clang-format-diff-3.9 /usr/bin/clang-format-diff
+    fi
+  fi
+elif [ "$HOST_OS" = "Mac" ]; then
+  # detect brew
+  if ! _detect_cmd brew; then
+    _echo_sn "Install brew"
+    _detect curl
+    _detect ruby
+    ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+  fi
+  # brew install
+  if [ -n "${_INIT_BUILD_}" ]; then
+    _install_deps "brew install" curl cmake git make
+  fi
+  if [ -n "${_INIT_LINTER_}" ]; then
+    _install_deps "brew install" clang-format
+    # link clang-format-diff (if not compatible with Python 3, fix it by yourself)
+    [ -f "/usr/local/bin/clang-format-diff" ] || \
+      ln -s /usr/local/share/clang/clang-format-diff.py /usr/local/bin/clang-format-diff
+  fi
+elif [ "$HOST_OS" = "Win" ]; then
+  # detect pacman on MSYS
+  _detect pacman
+  # pacman install
+  if [ -n "${_INIT_BUILD_}" ]; then
+    _install_deps "pacman -S" curl git make
+    if [ "$HOST_NAME" = "MINGW" ]; then
+      # MINGW: cmake
+      _deps=()
+      if [ "$HOST_ARCH" = "x64" ]; then
+        _deps+=(mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake)
+      elif [ "$HOST_ARCH" = "x86" ]; then
+        _deps+=(mingw-w64-i686-toolchain mingw-w64-i686-cmake)
+      else
+        _echo_e "Unknown host arch :("
+        exit 1
+      fi
+      if ! [ ${#_deps[@]} -eq 0 ]; then
+        _install_deps "pacman -S" ${_deps[@]}
+      fi
+    else
+      # Install CMake for Windows
+      #   https://cmake.org/
+      _detect cmake
+    fi
+  fi
+  if [ -n "${_INIT_LINTER_}" ]; then
+    _install_deps "pacman -S" clang-format
+  fi
+  # update
+  #   pacman -Syu
+  # search
+  #   pacman -Ss make
+  # autoremove
+  #   pacman -Qtdq | pacman -Rs -
+else  # unexpected
+  _echo_e "Unknown host os :("
+  exit 1
+fi
+
+## init linter - optional
+
+if [ -n "${_INIT_LINTER_}" ]; then
+
+# python
+
+PYTHON="python"
+if [ "$HOST_OS" = "Win" ]; then
+  if ! _detect_cmd $PYTHON; then
+    PYTHON="python2"  # try python2 on MSYS
+  fi
+fi
+
+_detect $PYTHON 1
+
+PYTHON_FOUND="${PYTHON}_FOUND"
+if [ -z "${!PYTHON_FOUND}" ]; then
+  _echo_en "$PYTHON not found"
+fi
+
+# pip
+
+# detect pip
+if ! _detect_cmd pip; then
+  if [ -n "${!PYTHON_FOUND}" ]; then
+    _echo_sn "Install pip"
+    [ -f "get-pip.py" ] || curl -O https://bootstrap.pypa.io/get-pip.py
+    $SUDO $PYTHON get-pip.py
+  else
+    _echo_en "Skipped install pip, as $PYTHON not found"
+  fi
+fi
+# pip install
+if _detect_cmd pip; then
+  _echo_d "pip install --upgrade autopep8 cpplint pylint requests"
+  $SUDO pip install --upgrade autopep8 cpplint pylint requests
+else
+  _echo_en "Skipped pip install packages, as pip not found"
+fi
+
+# realpath
+
+# detect realpath
+if ! _detect_cmd realpath; then
+  _echo_sn "Install realpath"
+  if [ "$HOST_OS" = "Linux" ]; then
+    # How to install realpath on Ubuntu 14.04
+    #   https://www.howtoinstall.co/en/ubuntu/trusty/realpath
+    $SUDO apt-get install coreutils realpath
+  elif [ "$HOST_OS" = "Mac" ]; then
+    brew install coreutils
+  elif [ "$HOST_OS" = "Win" ]; then
+    pacman -S coreutils
+  else  # unexpected
+    _echo_e "Unknown host os :("
+    exit 1
+  fi
+fi
+
+ROOT_DIR=$(realpath "$BASE_DIR/..")
+
+# init git hooks
+
+if [ -n "${!PYTHON_FOUND}" ]; then
+  _echo_s "Init git hooks"
+  $PYTHON "$ROOT_DIR/tools/linter/init-git-hooks.py"
+else
+  _echo_en "Skipped init git hooks, as $PYTHON not found"
+fi
+
+fi  # _INIT_LINTER_