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annotate cmd2.py @ 20:d6d64c2e3b98

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author devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
date Wed, 19 Dec 2007 11:49:23 -0500
parents 25f22e742a68
children 8b55aaa52ce9
rev   line source
20
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1 """Variant on standard library's cmd with extra features:
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2
20
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3 Searchable command history
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4 Multi-line commands
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5 Case-insensitive commands
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6 Special-character shortcut commands
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7 """
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8 import cmd, re, os
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9
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10 class Cmd(cmd.Cmd):
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11 excludeFromHistory = '''run r list l history hi ed li'''.split()
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12 caseInsensitive = True
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13 multilineCommands = []
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14 continuationPrompt = '> '
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15 shortcuts = {'?': 'help', '!': 'shell'}
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16 def __init__(self, *args, **kwargs):
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17 cmd.Cmd.__init__(self, *args, **kwargs)
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18 self.history = History()
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19
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20 def precmd(self, line):
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21 """Hook method executed just before the command line is
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22 interpreted, but after the input prompt is generated and issued.
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23
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24 Makes commands case-insensitive (but unfortunately does not alter command completion).
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25 """
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26 try:
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27 (command, args) = line.split(None,1)
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28 except ValueError:
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29 (command, args) = line, ''
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30 if self.caseInsensitive:
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31 command = command.lower()
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32 statement = ' '.join([command, args])
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33 if (not self.multilineCommands) or (command not in self.multilineCommands):
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34 return statement
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35 return self.finishStatement(statement)
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36
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37 def postcmd(self, stop, line):
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38 """Hook method executed just after a command dispatch is finished."""
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39 try:
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40 command = line.split(None,1)[0].lower()
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41 if command not in self.excludeFromHistory:
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42 self.history.append(line)
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43 finally:
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44 return stop
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45
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46 def finishStatement(self, firstline):
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47 statement = firstline
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48 while not self.statementHasEnded(statement):
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49 statement = '%s\n%s' % (statement, raw_input(self.continuationPrompt))
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50 return statement
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51 # assembling a list of lines and joining them at the end would be faster,
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52 # but statementHasEnded needs a string arg; anyway, we're getting
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53 # user input and users are slow.
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54
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55 statementEndPattern = re.compile(r'[\n;]\s*$')
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56 def statementHasEnded(self, lines):
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57 """This version lets statements end with ; or with a blank line.
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58 Override for your own needs."""
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59 return bool(self.statementEndPattern.search(lines))
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60
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61 def parseline(self, line):
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62 """Parse the line into a command name and a string containing
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63 the arguments. Returns a tuple containing (command, args, line).
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64 'command' and 'args' may be None if the line couldn't be parsed.
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65 """
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66 line = line.strip()
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67 if not line:
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68 return None, None, line
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69 shortcut = self.shortcuts.get(line[0])
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70 if shortcut and hasattr(self, 'do_%s' % shortcut):
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71 line = '%s %s' % (shortcut, line[1:])
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72 i, n = 0, len(line)
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73 while i < n and line[i] in self.identchars: i = i+1
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74 cmd, arg = line[:i], line[i:].strip()
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75 return cmd, arg, line
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76
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77 def do_shell(self, arg):
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78 'execute a command as if at the OS prompt.'
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79 os.system(arg)
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80
16
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81 def do_history(self, arg):
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82 """history [arg]: lists past commands issued
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83
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84 no arg -> list all
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85 arg is integer -> list one history item, by index
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86 arg is string -> string search
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87 arg is /enclosed in forward-slashes/ -> regular expression search
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88 """
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89 if arg:
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90 history = self.history.get(arg)
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91 else:
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92 history = self.history
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93 for hi in history:
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94 hi.pr()
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95 def last_matching(self, arg):
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96 try:
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97 if arg:
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98 return self.history.get(arg)[-1]
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99 else:
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100 return self.history[-1]
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101 except:
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102 return None
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103 def do_list(self, arg):
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104 """list [arg]: lists last command issued
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105
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106 no arg -> list absolute last
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107 arg is integer -> list one history item, by index
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108 - arg, arg - (integer) -> list up to or after #arg
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109 arg is string -> list last command matching string search
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110 arg is /enclosed in forward-slashes/ -> regular expression search
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111 """
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112 try:
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113 self.last_matching(arg).pr()
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114 except:
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115 pass
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116 do_hi = do_history
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117 do_l = do_list
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118 do_li = do_list
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119
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120 class HistoryItem(str):
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121 def __init__(self, instr):
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122 str.__init__(self, instr)
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123 self.lowercase = self.lower()
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124 self.idx = None
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125 def pr(self):
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126 print '-------------------------[%d]' % (self.idx)
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127 print self
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128
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129 class History(list):
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130 rangeFrom = re.compile(r'^([\d])+\s*\-$')
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131 def append(self, new):
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132 new = HistoryItem(new)
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133 list.append(self, new)
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134 new.idx = len(self)
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135 def extend(self, new):
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136 for n in new:
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137 self.append(n)
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138 def get(self, getme):
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139 try:
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140 getme = int(getme)
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141 if getme < 0:
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142 return self[:(-1 * getme)]
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143 else:
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144 return [self[getme-1]]
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145 except IndexError:
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146 return []
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147 except (ValueError, TypeError):
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148 getme = getme.strip()
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149 mtch = self.rangeFrom.search(getme)
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150 if mtch:
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151 return self[(int(mtch.group(1))-1):]
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152 if getme.startswith(r'/') and getme.endswith(r'/'):
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153 finder = re.compile(getme[1:-1], re.DOTALL | re.MULTILINE | re.IGNORECASE)
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154 def isin(hi):
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155 return finder.search(hi)
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156 else:
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157 def isin(hi):
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158 return (getme.lower() in hi.lowercase)
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159 return [itm for itm in self if isin(itm)]
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160
17
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161
16
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162