BASH 文本模版的简单实现 micro_template_compile

详细代码

###############################

#

# Funciton: micro_template_compile

#

# Parameter:

#    [1] => template :String

#    [2..n] => values for placeholder as key=value

#

# Example:

#    <- micro_template_compile '{code: {{error.code}}, message: "{{error.message}}"}' "error.code=127" "error.message=command not found."

#       ---

#    -> { code: 0, message: "" }

###############################

function micro_template_compile() {

  template_string="$1"; shift;

  expression=""

  while [ $# -ne 0 ]; do

    key=$(echo "$1" | sed 's~^\([^=]*\)=\(.*\)$~\1~g')

    value=$(echo "$1" | sed 's~^\([^=]*\)=\(.*\)$~\2~g')

    expression="s~{{$key}}~$value~g;$expression"

    shift;

  done

  echo "$template_string" | sed "$expression"

}

使用案例

运行

micro_template_compile 'Hi {{name}}, it is {{date}} today and {{weather}} outside. :)

message to you: {{message}}' \

  name='小王' date="$(date +"%Y/%m/%d")" weather="大晴天儿" message="咱们出去钓鱼吧。"

输出

Hi 小王, it is 2014/06/16 today and 大晴天儿 outside. :)

message to you: 咱们出去钓鱼吧！

使用到脚本中：

#!/bin/bash

#

# Usage: $exename [options] -in templatefile key=value ...

#

# Examples:

#   $exename -in ./1.txt.template -out ./1.txt f1=v1 f2=v2 f3=v3

#   $exename -help

#

###############################

#

# Funciton: micro_template_compile

#

# Parameter:

#    [1] => template :String

#    [2..n] => values for placeholder as key=value

#

# Example:

#    <- micro_template_compile '{code: {{error.code}}, message: "{{error.message}}"}' "error.code=127" "error.message=command not found."

#       ---

#    -> { code: 0, message: "" }

###############################

function micro_template_compile() {

  local template_string="$1"; shift;

  local expression=""

  local key=""

  local value=""

  while [ $# -ne 0 ]; do

    key=$(echo "$1" | sed 's~^\([^=]*\)=\(.*\)$~\1~g')

    value=$(echo "$1" | sed 's~^\([^=]*\)=\(.*\)$~\2~g')

    expression="s~{{$key}}~$value~g;$expression"

    shift;

  done

  echo "$template_string" | sed "$expression"

}

main() {

  template="$(cat "$arg_in")"

  eval "micro_template_compile '$template' $arg_datagroup > '$arg_out'"

  return 0

}

processargs() {

  # defaults:

  arg_in=""

  arg_out="stdout"

  arg_datagroup=""

  # arguments:

  while echo "$1" | grep "^-" >/dev/null 2>&1; do

    case "$1" in

      -in)

        arg_in="$2"; shift;

        ;;

      -out)

        arg_out="$2"; shift;

        ;;

    esac

    shift

  done

  while [ $# -ne 0 ]; do

    arg_datagroup="$arg_datagroup \"$1\""; shift;

  done

  # exports

  export arg_in arg_out arg_datagroup

}

processargs "$@"

echo ""

echo "arg_in=|$arg_in|"

echo "arg_out=|$arg_out|"

echo "arg_datagroup=|$arg_datagroup|"

echo ""

main