diff --git a/bake.bash b/bake.bash
index fde92f6b..54ac2634 100644
--- a/bake.bash
+++ b/bake.bash
@@ -197,53 +197,6 @@ bake._log(){
   echo -e "$level $(date "+%F %T") $(bake._pwd)\$ ${FUNCNAME[1]}() : $*" >&2
 }
 
-# list bake internal var , used to debug bake self
-# Usage: info
-bake.info() (
-
-cat <<- EOF
-
- .----------------.  .----------------.  .----------------.  .----------------.
-| .--------------. || .--------------. || .--------------. || .--------------. |
-| |   ______     | || |      __      | || |  ___  ____   | || |  _________   | |
-| |  |_   _ \    | || |     /  \     | || | |_  ||_  _|  | || | |_   ___  |  | |
-| |    | |_) |   | || |    / /\ \    | || |   | |_/ /    | || |   | |_  \_|  | |
-| |    |  __'.   | || |   / ____ \   | || |   |  __'.    | || |   |  _|  _   | |
-| |   _| |__) |  | || | _/ /    \ \_ | || |  _| |  \ \_  | || |  _| |___/ |  | |
-| |  |_______/   | || ||____|  |____|| || | |____||____| | || | |_________|  | |
-| |              | || |              | || |              | || |              | |
-| '--------------' || '--------------' || '--------------' || '--------------' |
- '----------------'  '----------------'  '----------------'  '----------------'
-
-EOF
-  echo '# bake info & internal var'
-  echo
-  echo '## _cmdTree'
-  echo
-  for key in "${!_cmdTree[@]}"; do
-    printf "cmd  - %-40s = %q\n" "$key" "${_cmdTree["$key"]:0:100}"
-  done | sort
-  echo
-  echo '## _data'
-  echo
-  for key in "${!_data[@]}"; do
-    printf "data - %-40s = %q\n" "$key" "${_data["$key"]:0:100}"
-  done | sort
-  echo
-  echo '## options'
-  echo
-  echo "help   = $help"
-  echo "debug  = $debug"
-  echo
-
-cat <<- EOF
-
-
-
-
-EOF
-)
-
 
 ##########################################
 # bake common script
@@ -415,6 +368,122 @@ bake._opt_internal_add() {
 }
 
 
+# Usage: bake._cmd_register
+# ensure all cmd register
+bake._cmd_register() {
+  local functionName
+
+  while IFS=$'\n' read -r functionName; do
+    if [[ "$functionName" == */* ]]; then
+      echo "error: function $functionName() can not contains '/' " >&2
+      return 1
+    fi
+    local upCmd
+    for upCmd in $(bake._cmd_up_chain "$functionName"); do
+      # if upCmd is a function , set upCmd value to data path
+      if compgen -A function | grep -q "^$upCmd$"; then
+        _cmdTree["$upCmd"]="$upCmd"
+      else
+        _cmdTree["$upCmd"]="PARENT_CMD_NOT_FUNC"
+      fi
+    done
+
+    # list all function name
+    # declare -F | awk {'print $3'} == compgen -A function
+    # declare -f func1  -> func1
+    # declare -fx func2 -> func2
+#  done <<<"$(compgen -A function)"
+  done <<<"$(declare -F | grep "declare -f" | awk {'print $3'})"
+}
+
+# 显示一条命令的帮助
+# Usage: bake._show_cmd_help <CMD>
+# Examples: bake._show_cmd_help deploy #显示deploy的帮助:
+bake._show_cmd_help() {
+  local cmd="$1"
+
+  if [[ "$cmd" == "" ]]; then
+    bake._throw "bake._show_cmd_help need a arg: bake._show_cmd_help [cmd]"
+  fi
+
+  shift
+
+  eval "$(bake.parse "${FUNCNAME[0]}" "$@")"
+
+  local usage
+  usage="${_data["${cmd}/usage"]}"
+  if [[ "$usage" != "" ]]; then
+    echo -e "\nUsage:  $usage "
+  else
+    echo -e "\nUsage:  ./$BAKE_FILE $(bake._str_split "$cmd" "." | tr "\n" " ") [options] [args...]"
+  fi
+
+  echo
+
+  echo "Currently running: $(bake._pwd)/$BAKE_FILE $cmd $@"
+
+  echo
+
+  if [[ "${_data["${cmd}/description"]}" != "" ]]; then
+    echo "Description: ${_data["${cmd}/description"]}"
+  elif [[ "${_data[${cmd} / summary]}" != "" ]]; then
+    echo "Description: ${_data["${cmd}/summary"]}"
+  else
+    echo "no description"
+  fi
+
+  echo
+
+  echo "Available Options:"
+  for optPath in $(bake._opt_cmd_chain_opts "$cmd"); do
+    local opt
+    opt=$(bake._path_basename "$optPath")
+    local name=${_data["$optPath/name"]}
+    local type=${_data["$optPath/type"]}
+    local required=${_data["$optPath/required"]}
+    local abbr=${_data["$optPath/abbr"]}
+    local default=${_data["$optPath/default"]}
+    local optHelp="${_data["$optPath/optHelp"]}"
+
+    local optArgDesc=""
+    if [[ "$type" == "string" ]]; then
+      if [[ "$default" != "" ]]; then
+        optArgDesc+="<$type:${default}>"
+      else
+        optArgDesc="<$type>"
+      fi
+    fi
+
+    printf " --%-20s -%-2s %-6s required:[%s] %b\n" "$name $optArgDesc" "$abbr" "$type" "$required" "$optHelp"
+  done
+
+  echo "
+Available Commands:"
+  local maxLengthOfCmd
+  maxLengthOfCmd="$(bake._cmd_childrenNameMaxLength "$cmd")"
+
+  for subCmd in $(bake._cmd_children "$cmd"); do
+
+    # only show public cmd if not verbose
+    # '_'起头的命令和'bake'命令，只有debug模式才打印出来
+    if [[ ("$subCmd" == _* || "$subCmd" == bake*)  ]]; then
+      if [[  "$debug" != "true" ]]; then
+        continue
+      fi
+    fi
+
+    local subCmdPath="$cmd/$subCmd"
+    [[ "$cmd" == "_root" ]] && subCmdPath="$subCmd"
+
+    local summary
+    summary="${_data["$subCmdPath/summary"]}"
+    summary="$(echo -e "$summary")" #  backslash escapes interpretation
+
+    printf "  %-$((maxLengthOfCmd))s  ${summary}\n" "${subCmd}"
+  done
+}
+
+
 # 为cmd配置参数
 # Examples:
 #   bake.opt --cmd "build" --name "is_zip" --type bool --required --abbr z --default true --optHelp "is_zip, build项目时是否压缩"
@@ -448,6 +517,7 @@ bake.opt() {
   bake._opt_internal_add "$cmd" "$name" "$type" "${required:-false}" "$default" "$abbr" "$optHelp"
 }
 
+# bake.opt  (public api)
 # 像其他高级语言的cli工具一样，用简单变量就可以获取名称化的命令参数:
 # 支持bool,string,list三种参数，用法如下：
 # 你的./bake脚本里：
@@ -473,7 +543,6 @@ bake.opt() {
 #
 # Usage: bake.parse <cmd:default _root> [arg1] [arg2] ...
 # 参考：[bake.opt]
-
 bake.parse() {
   local cmd="${1}"
   if [[ "$cmd" == "" ]]; then
@@ -548,6 +617,17 @@ bake.parse() {
   echo -e "$resultStr" # echo -e : unescapes backslash
 }
 
+
+# bake.cmd  (public api)
+# 注册一个命令的帮助信息
+# Examples:
+#   bake.cmd --cmd build --summary "build project" --usage "Usage: ./$SCRIPT_FILE build [options]"
+# 尤其是可以配置_root命令以定制根命令的帮助信息，比如:
+#   bake.cmd --cmd _root \
+#             --usage "./$SCRIPT_FILE [cmd] [opts] [args...]" \
+#             --summary "flutter-note cli." \
+#             --description ".... your root cmd help "
+# 这样就可以用'./your_script -h' 查看根帮助了
 bake.opt --cmd "bake.cmd" --name "cmd"         --type string --optHelp "cmd, function name"
 bake.opt --cmd "bake.cmd" --name "usage"       --type string --optHelp "usage"
 bake.opt --cmd "bake.cmd" --name "summary"     --type string --optHelp "summary help, short, show on cmd list"
@@ -566,121 +646,49 @@ bake.cmd() {
   _data["$cmd/description"]="$description"
 }
 
-# Usage: bake._cmd_register
-# ensure all cmd register
-bake._cmd_register() {
-  local functionName
-
-  while IFS=$'\n' read -r functionName; do
-    if [[ "$functionName" == */* ]]; then
-      echo "error: function $functionName() can not contains '/' " >&2
-      return 1
-    fi
-    local upCmd
-    for upCmd in $(bake._cmd_up_chain "$functionName"); do
-      # if upCmd is a function , set upCmd value to data path
-      if compgen -A function | grep -q "^$upCmd$"; then
-        _cmdTree["$upCmd"]="$upCmd"
-      else
-        _cmdTree["$upCmd"]="PARENT_CMD_NOT_FUNC"
-      fi
-    done
-
-    # list all function name
-    # declare -F | awk {'print $3'} == compgen -A function
-    # declare -f func1  -> func1
-    # declare -fx func2 -> func2
-#  done <<<"$(compgen -A function)"
-  done <<<"$(declare -F | grep "declare -f" | awk {'print $3'})"
-}
-
-# 显示一条命令的帮助
-# Usage: bake._show_cmd_help <CMD>
-# Examples: bake._show_cmd_help deploy #显示deploy的帮助:
-bake._show_cmd_help() {
-  local cmd="$1"
 
-  if [[ "$cmd" == "" ]]; then
-    bake._throw "bake._show_cmd_help need a arg: bake._show_cmd_help [cmd]"
-  fi
-
-  shift
+# list bake internal var , used to debug bake self
+# Usage: info
+bake.info() {
 
-  eval "$(bake.parse "${FUNCNAME[0]}" "$@")"
+cat <<- EOF
 
-  local usage
-  usage="${_data["${cmd}/usage"]}"
-  if [[ "$usage" != "" ]]; then
-    echo -e "\nUsage:  $usage "
-  else
-    echo -e "\nUsage:  ./$BAKE_FILE $(bake._str_split "$cmd" "." | tr "\n" " ") [options] [args...]"
-  fi
+ .----------------.  .----------------.  .----------------.  .----------------.
+| .--------------. || .--------------. || .--------------. || .--------------. |
+| |   ______     | || |      __      | || |  ___  ____   | || |  _________   | |
+| |  |_   _ \    | || |     /  \     | || | |_  ||_  _|  | || | |_   ___  |  | |
+| |    | |_) |   | || |    / /\ \    | || |   | |_/ /    | || |   | |_  \_|  | |
+| |    |  __'.   | || |   / ____ \   | || |   |  __'.    | || |   |  _|  _   | |
+| |   _| |__) |  | || | _/ /    \ \_ | || |  _| |  \ \_  | || |  _| |___/ |  | |
+| |  |_______/   | || ||____|  |____|| || | |____||____| | || | |_________|  | |
+| |              | || |              | || |              | || |              | |
+| '--------------' || '--------------' || '--------------' || '--------------' |
+ '----------------'  '----------------'  '----------------'  '----------------'
 
+EOF
+  echo '# bake info & internal var'
   echo
-
-  echo "Currently running: $(bake._pwd)/$BAKE_FILE $cmd $@"
-
+  echo '## _cmdTree'
   echo
-
-  if [[ "${_data["${cmd}/description"]}" != "" ]]; then
-    echo "Description: ${_data["${cmd}/description"]}"
-  elif [[ "${_data[${cmd} / summary]}" != "" ]]; then
-    echo "Description: ${_data["${cmd}/summary"]}"
-  else
-    echo "no description"
-  fi
-
+  for key in "${!_cmdTree[@]}"; do
+    printf "cmd  - %-40s = %q\n" "$key" "${_cmdTree["$key"]:0:100}"
+  done | sort
+  echo
+  echo '## _data'
+  echo
+  for key in "${!_data[@]}"; do
+    printf "data - %-40s = %q\n" "$key" "${_data["$key"]:0:100}"
+  done | sort
+  echo
+  echo '## options'
+  echo
+  echo "help   = $help"
+  echo "debug  = $debug"
   echo
 
-  echo "Available Options:"
-  for optPath in $(bake._opt_cmd_chain_opts "$cmd"); do
-    local opt
-    opt=$(bake._path_basename "$optPath")
-    local name=${_data["$optPath/name"]}
-    local type=${_data["$optPath/type"]}
-    local required=${_data["$optPath/required"]}
-    local abbr=${_data["$optPath/abbr"]}
-    local default=${_data["$optPath/default"]}
-    local optHelp="${_data["$optPath/optHelp"]}"
-
-    local optArgDesc=""
-    if [[ "$type" == "string" ]]; then
-      if [[ "$default" != "" ]]; then
-        optArgDesc+="<$type:${default}>"
-      else
-        optArgDesc="<$type>"
-      fi
-    fi
-
-    printf " --%-20s -%-2s %-6s required:[%s] %b\n" "$name $optArgDesc" "$abbr" "$type" "$required" "$optHelp"
-  done
-
-  echo "
-Available Commands:"
-  local maxLengthOfCmd
-  maxLengthOfCmd="$(bake._cmd_childrenNameMaxLength "$cmd")"
-
-  for subCmd in $(bake._cmd_children "$cmd"); do
-
-    # only show public cmd if not verbose
-    # '_'起头的命令和'bake'命令，只有debug模式才打印出来
-    if [[ ("$subCmd" == _* || "$subCmd" == bake*)  ]]; then
-      if [[  "$debug" != "true" ]]; then
-        continue
-      fi
-    fi
-
-    local subCmdPath="$cmd/$subCmd"
-    [[ "$cmd" == "_root" ]] && subCmdPath="$subCmd"
-
-    local summary
-    summary="${_data["$subCmdPath/summary"]}"
-    summary="$(echo -e "$summary")" #  backslash escapes interpretation
-
-    printf "  %-$((maxLengthOfCmd))s  ${summary}\n" "${subCmd}"
-  done
 }
 
+
 bake.go() {
   # init register all cmd