python实现批处理文件

Windows下的bat, linux 下的shell 用来做批处理都很好用，可惜不通用
用 Python 来做就简单多了，不过一条条写代码来调用系统命令也够烦的了
程序员都很懒, 不愿做机械无谓的重复性工作, 干脆自己实现一个.

用法超级简单, 默认会执行一个自定义的 batch.json, 按顺序一条条执行其中的步骤

{"steps":
  [
  {"step":"df -h","desc":"display disk space usage"},
  {"step":"date","desc":"display the current dater"},
  {"step":"time","desc":"display the current time"}
  ]
}

用法：

python batch.py

当然也可以指定不同的步骤文件 , 例如

python batch.py xxx.json

运行结果以markdown形式输出, 例如

$ python batch.py
Usage: python batch.py <batch_json_file>
note: execute the batch.json by default
# Execute batch.json begin
---------------------------

## Will execute 3 steps
~~~~~~~~~~~~~~~~~~~~~~~~~~~
0. [df -h]: display disk space usage
1. [date]: display the current dater
2. [time]: display the current time

* 0. [df -h]: display disk space usage
Filesystem             Size  Used Avail Capacity iused  ifree %iused Mounted on
/dev/disk1             233Gi 208Gi  24Gi  90% 54622825 6364694  90%  /
devfs               329Ki 329Ki  0Bi  100%   

* 1. [date]: display the current dater
Thu Mar 3 22:50:21 CST 2016

* 2. [time]: display the current time

real  0m0.001s
user  0m0.000s
sys 0m0.000s

## Done the following steps
~~~~~~~~~~~~~~~~~~~~~~~~~~~
0. [df -h]: display disk space usage
1. [date]: display the current dater
# Execute batch.json end.

Python源代码如下, 希望有人能用得上

'''
  like bat file, execute the steps in batch.json
'''
import os,sys,subprocess
import time,thread
import codecs
import json
from datetime import datetime
from subprocess import call
from pprint import pprint

def execute_json(json_file):
  print "# Execute {0} begin\n---------------------------".format(json_file)

  json_data=open(json_file)
  data = json.load(json_data)
  cnt = len(data['steps'])
  i = 0
  print "\n## Will execute {0} steps \n~~~~~~~~~~~~~~~~~~~~~~~~~~~".format(cnt)
  for i in range(0, cnt):
      print "{0}. [{1}]: {2}".format(i, data['steps'][i]['step'], data['steps'][i]['desc'])

  #pprint(data)
  #print("cnt=", cnt)
  for i in range(0, cnt):
    cmd = data['steps'][i]['step']
    desc = data['steps'][i]['desc']
    print "\n* {0}. [{1}]: {2} ".format(i, cmd, desc)

    if(cmd.startswith('cd')):
      cmd = cmd.replace("cd ", "")
      os.chdir(cmd)
    else:
      ret = os.system(cmd)
      if(ret != 0):
        print "Encounter error of step {0}. {1}, error code={2}".format(i, cmd, ret)
        break

  print "\n## Done the following steps\n~~~~~~~~~~~~~~~~~~~~~~~~~~~"
  for j in range(0, i):
    print "{0}. [{1}]: {2}".format(j, data['steps'][j]['step'], data['steps'][j]['desc'])
  json_data.close()
  print "# Execute {0} end.".format(json_file)

if __name__ == "__main__":
  argc = len(sys.argv)
  step_file = 'batch.json'
  if( argc > 1):
    idx = 1
    while(idx < argc):
      step_file = sys.argv[idx]
      execute_json(step_file)
      idx = idx + 1
  else:
    print "Usage: python {0} <batch_json_file>".format(sys.argv[0])
    print "note: execute the batch.json by default"
    execute_json(step_file)

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