使用python模拟命令行终端的示例


Posted in Python onAugust 13, 2019

可以对?显示帮助信息,需要立即获取输入的字符,因此需要用到termios模块

另外需要对tab键做处理,当按下tab键时可以进行自动补全

#! /usr/bin/env python
# coding=utf-8
 
import os
import sys
import tty
import termios
 
'''
Enter: 13
Back:  127
?:   63
C-h:  8
C-w:  23
Tab:  9
C-u:  21
C-c:  3
C-d:  4
C-\:  28
SPACE: 32
'''
 
CLI_KEY_CNCR = 13
CLI_KEY_BACK = 127
CLI_KEY_QMARK = 63
CLI_KEY_CTRLH = 8
CLI_KEY_CTRLW = 23
CLI_KEY_TAB  = 9
CLI_KEY_CTRLU = 21
CLI_KEY_CTRLC = 3
CLI_KEY_CTRLD = 4
CLI_KEY_QUIT = 28
CLI_KEY_SPACE = 32
CLI_KEY_TABLEN = 4
 
class CLI(object):
  def __init__(self):
    self.line = ''
    self.line_complete = ''
    self.completer_on = False
    self.completer_dict = {}
    self.completer_dict_keys = self.completer_dict.keys()
    self.completer_id = 0
    self.completer_cnt = len(self.completer_dict)
  def getch(self):
    fd = sys.stdin.fileno()
    old_settings = termios.tcgetattr(fd)
    try:
      tty.setraw(fd)
      ch = sys.stdin.read(1)
    finally:
      termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
    return ch
  def completer_kw_update(self):
    self.completer_dict_keys = self.completer_dict.keys()
    self.completer_dict_keys.sort()
    self.completer_cnt = len(self.completer_dict)
  def completer_kw_add(self, key, word):
    self.completer_dict[key] = word
    self.completer_kw_update()
  def completer_kw_clear(self):
    self.completer_dict.clear()
    self.completer_id_update()
  def completer_id_update(self):
    self.completer_kw_update()
    if self.completer_id < self.completer_cnt - 1:
      self.completer_id += 1
    else:
      self.completer_id = 0
  def completer_wd_select(self, word):
    if not word:
      return ''
    cnt = self.completer_cnt
    while cnt>0:
      completer = self.completer_dict_keys[self.completer_id]
      self.completer_id_update()
      cnt -= 1
      if word == completer[:len(word)]:
        return completer[len(word):]
    return ''
  def printf(self, info=''):
    sys.stdout.write(info)
  def show_spec_len_str(self, info, maxlen, spacech=' '):
    'display a string of the specified length'
    maxlen = maxlen
    infolen = len(info)
    if maxlen < infolen:
      maxlen = infolen
    while infolen>0:
      ch = info[-infolen]
      for i in range(self.char_memory_len(ch)):
        self.printf(info[i-infolen])
      infolen -= self.char_memory_len(ch)
      maxlen -= self.char_display_len(ch)
    while maxlen>0:
      self.printf(spacech)
      maxlen -= self.char_display_len(spacech)
  def show_help_info(self):
    if self.completer_on:
      line = self.line_complete
    else:
      line = self.line
    lastwd = ''
    show_all = False
    if not line or line[-1] == ' ':
      show_all = True
    else:
      lastwd = line.split()[-1]
    if self.completer_dict:
      maxlen = max([len(info) for info in self.completer_dict])
    else:
      maxlen = 12
    for info in self.completer_dict:
      if show_all or lastwd == info[:len(lastwd)]:
        self.printf(' ')
        self.show_spec_len_str(info, maxlen)
        self.printf(' ')
        self.printf(self.completer_dict[info])
        self.printf('\r\n')
  def is_chinese_char(self, ch):
    return ord(ch) > 127
  def char_display_len(self, ch):
    if self.is_chinese_char(ch):
      return 2
    elif ord(ch) == CLI_KEY_TAB:
      return CLI_KEY_TABLEN
    else:
      return 1
  def char_memory_len(self, ch):
    if self.is_chinese_char(ch):
      return 3
    else:
      return 1
  def rm_last_char(self, line):
    lastch = ''
    rmlen = 0
    if len(line)>0:
      lastch = line[-1]
      self.printf('\b \b' * self.char_display_len(lastch))
      rmlen = self.char_memory_len(lastch)
      if len(line) >= rmlen:
        line = line[:-(rmlen)]
      else:
        rmlen = len(line)
        line = ''
    return rmlen, line
  def rm_last_word(self, line):
    lastwd = ''
    linelen = len(line)
    rspacelen = linelen - len(line.rstrip())
    if not linelen:
      return line
    lastwd = line.split()[-1]
    backlen = len(lastwd) + rspacelen
    rmlen = 0
    while backlen>0 and line:
      rmlen, line = self.rm_last_char(line)
      backlen -= rmlen
    return line
  def rm_one_line(self, line):
    rmlen = 0
    while line:
      rmlen, line = self.rm_last_char(line)
    return line
  def do_line_complete_proc(self):
    line = self.line
    line_complete = self.line_complete
    lastwd = ''
    self.printf('\r\n')
    if self.line_complete:
      self.printf(self.line_complete)
    else:
      self.printf(self.line)
    if not line:
      return line
    lastwd = line.split()[-1]
    completer = self.completer_wd_select(lastwd)
    if not completer.strip():
      self.line_complete = line
      return line
    backlen = len(line_complete) - len(line)
    while backlen>0 and line_complete:
      rmlen, line_complete = self.rm_last_char(line_complete)
      backlen -= rmlen
    self.printf(completer)
    line_complete = line + completer
    self.line_complete = line_complete
  def do_line_complete_end(self):
    if self.completer_on:
      self.line = self.line_complete
      self.line_complete = ''
      self.completer_on = False
  def get_line(self):
    self.line = ''
    self.line_complete = ''
    self.completer_on = False
    while True:
      ch = self.getch()
      if ch == '\r' or ch == '\n':
        self.do_line_complete_end()
        self.printf('\r\n')
        break
      elif ord(ch) == CLI_KEY_BACK or ord(ch) == CLI_KEY_CTRLH:
        if self.completer_on:
          rmlen, self.line_complete = self.rm_last_char(self.line_complete)
        else:
          rmlen, self.line = self.rm_last_char(self.line)
        self.do_line_complete_end()
      elif ord(ch) == CLI_KEY_QMARK:
        self.printf('?')
        self.printf('\r\n')
        self.show_help_info()
        if self.completer_on:
          self.printf(self.line_complete)
        else:
          self.printf(self.line)
      elif ord(ch) == CLI_KEY_CTRLW:
        if self.completer_on:
          self.line_complete = self.rm_last_word(self.line_complete)
        else:
          self.line = self.rm_last_word(self.line)
        self.do_line_complete_end()
      elif ord(ch) == CLI_KEY_TAB:
        self.completer_on = True
        self.do_line_complete_proc()
      elif ord(ch) == CLI_KEY_CTRLD:
        if self.line:
          return self.line
        else:
          return ch
      elif ord(ch) == CLI_KEY_QUIT:
        self.printf('\r\n Interrupted by <Ctrl-\>.\r\n')
        sys.exit()
      elif ord(ch) == CLI_KEY_CTRLU:
        if self.completer_on:
          self.line_complete = self.rm_one_line(self.line_complete)
        else:
          self.line = self.rm_one_line(self.line)
        self.do_line_complete_end()
      elif ord(ch) == CLI_KEY_SPACE:
        self.printf(ch)
        if self.completer_on:
          self.line_complete += ch
        else:
          self.line += ch
      else:
        self.printf(ch)
        self.do_line_complete_end()
        self.line += ch
        # chinese qmask proc
        if ord(ch) == 159 and len(self.line)>= 3 and self.line[-3:] == '\xef\xbc\x9f':
          self.printf('\r\n')
          self.line = self.line[:-3]
          self.show_help_info()
          self.printf(self.line)
    return self.line
  def get_raw_line(self):
    self.raw_line = ''
    while True:
      ch = self.getch()
      if ch == '\r' or ch == '\n':
        self.printf('\r\n')
        break
      elif ord(ch) == CLI_KEY_BACK or ord(ch) == CLI_KEY_CTRLH:
        rmlen, self.raw_line = self.rm_last_char(self.raw_line)
      elif ord(ch) == CLI_KEY_CTRLW:
        self.raw_line = self.rm_last_word(self.raw_line)
      elif ord(ch) == CLI_KEY_TAB:
        self.printf(' ' * self.char_display_len(ch))
        self.raw_line += ch
      elif ord(ch) == CLI_KEY_CTRLD:
        if self.raw_line:
          return self.raw_line
        else:
          return ch
      elif ord(ch) == CLI_KEY_QUIT:
        self.printf('\r\n Interrupted by <Ctrl-\>.\r\n')
        sys.exit()
      elif ord(ch) == CLI_KEY_CTRLU:
        self.raw_line = self.rm_one_line(self.raw_line)
      else:
        self.raw_line += ch
        self.printf(ch)
    return self.raw_line
 
def test():
  cli = CLI()
  help_info = {
  	'hello0':   'say hello 0',
  	'hello1':   'say hello 1',
  	'hellohello': 'say hello hello',
  	'hellohehe': 'say hello hehe',
  	'hellohi':  'say hello hi',
  	'你好啊':   'say 你好啊',
  	'你好吗':   'say 你好吗',
  	'你好哈':   'say 你好哈',
  	}
  for key in help_info:
    cli.completer_kw_add(key, help_info[key])
  while True:
    line = cli.get_line()
    if len(line) == 1 and ord(line[0]) == CLI_KEY_CTRLD:
      break
    if line == 'quit':
      break
    print(line)
 
if __name__ == "__main__": 
  test()

以上这篇使用python模拟命令行终端的示例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持三水点靠木。

Python 相关文章推荐
python将html转成PDF的实现代码(包含中文)
Mar 04 Python
pycharm 使用心得(九)解决No Python interpreter selected的问题
Jun 06 Python
Python读取文件内容的三种常用方式及效率比较
Oct 07 Python
解决Python计算矩阵乘向量,矩阵乘实数的一些小错误
Aug 26 Python
django中瀑布流写法实例代码
Oct 14 Python
python实现简单图书管理系统
Nov 22 Python
使用Python来做一个屏幕录制工具的操作代码
Jan 18 Python
Python简单实现词云图代码及步骤解析
Jun 04 Python
自学python用什么系统好
Jun 23 Python
Python3.9.1中使用split()的处理方法(推荐)
Feb 07 Python
Python Flask搭建yolov3目标检测系统详解流程
Nov 07 Python
Python实现批量将文件复制到新的目录中再修改名称
Apr 12 Python
在macOS上搭建python环境的实现方法
Aug 13 #Python
解决Mac下使用python的坑
Aug 13 #Python
python 接口实现 供第三方调用的例子
Aug 13 #Python
python 爬取学信网登录页面的例子
Aug 13 #Python
利用anaconda作为python的依赖库管理方法
Aug 13 #Python
基于Python的图像数据增强Data Augmentation解析
Aug 13 #Python
python通过txt文件批量安装依赖包的实现步骤
Aug 13 #Python
You might like
让你的PHP同时支持GIF、png、JPEG
2006/10/09 PHP
php的POSIX 函数以及进程测试的深入分析
2013/06/03 PHP
php实现概率性随机抽奖代码
2016/01/02 PHP
用Javascript实现Sleep暂停功能代码
2010/09/03 Javascript
Prototype源码浅析 String部分(一)之有关indexOf优化
2012/01/15 Javascript
JavaScript中的undefined学习总结
2013/11/30 Javascript
jquery移动节点实例
2015/01/14 Javascript
AngularJs实现ng1.3+表单验证
2015/12/10 Javascript
jQuery+css3实现转动的正方形效果(附demo源码下载)
2016/01/27 Javascript
javascript实现的全国省市县无刷新多级关联菜单效果代码
2016/08/01 Javascript
JS设置随机出现2个数字的实例代码
2017/07/19 Javascript
一步步教你利用Canvas对图片进行处理
2017/09/19 Javascript
原生js调用json方法总结
2018/02/22 Javascript
在小程序中集成redux/immutable/thunk第三方库的方法
2018/08/12 Javascript
浅析JavaScript异步代码优化
2019/03/18 Javascript
js利用iframe实现选项卡效果
2020/08/09 Javascript
跟老齐学Python之有容乃大的list(4)
2014/09/28 Python
python编写暴力破解FTP密码小工具
2014/11/19 Python
关于python的bottle框架跨域请求报错问题的处理方法
2017/03/19 Python
django在接受post请求时显示403forbidden实例解析
2018/01/25 Python
美国顶级水上运动专业店:Marine Products
2018/04/15 全球购物
英国独特礼物想法和个性化礼物网站:notonthehighstreet.com
2018/04/16 全球购物
捷克玩具商店:Bambule
2019/02/23 全球购物
日本最佳原创设计品牌:Felissimo(芬理希梦)
2019/03/19 全球购物
护士辞职信模板
2014/01/20 职场文书
经营理念标语
2014/06/21 职场文书
公司董事长助理工作职责
2014/07/12 职场文书
安全责任书模板
2014/07/22 职场文书
中学生教师节演讲稿
2014/09/03 职场文书
2014年房地产销售工作总结
2014/12/01 职场文书
预备党员转正材料
2014/12/19 职场文书
遗失说明具结保证书
2015/02/26 职场文书
优秀员工自荐书
2015/03/06 职场文书
幼儿园大班教师评语
2019/06/21 职场文书
Golang 并发编程 SingleFlight模式
2022/04/26 Golang
在ubuntu下安装go开发环境的全过程
2022/08/05 Golang