Mercurial > sqlpython

annotate cmd2.py @ 26:bb3fb24b6f5f

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settables ironed out
author devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
date Wed, 19 Dec 2007 16:10:01 -0500
parents c99853267a44
children ca6f34be3397
rev   line source
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1 """Variant on standard library's cmd with extra features:
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2
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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 Load commands from file
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8
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9 still to do:
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10 environment (maxrows, etc.)
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11 edit
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12
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13 """
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14 import cmd, re, os
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15
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16 class Cmd(cmd.Cmd):
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17 caseInsensitive = True
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18 multilineCommands = []
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19 continuationPrompt = '> '
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20 shortcuts = {'?': 'help', '!': 'shell', '@': 'load'}
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21 excludeFromHistory = '''run r list l history hi ed li eof'''.split()
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22 defaultExtension = 'txt'
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23 settable = ['prompt', 'continuationPrompt']
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24 terminators = ';\n'
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25 def do_cmdenvironment(self, args):
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26 self.stdout.write("""
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27 Commands are %(casesensitive)scase-sensitive.
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28 Commands may be terminated with: %(terminators)s
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29 Settable parameters: %(settable)s
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30 """ %
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31 { 'casesensitive': 'not ' if self.caseInsensitive else '',
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32 'terminators': ' '.join(self.terminators),
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33 'settable': ' '.join(self.settable)
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34 })
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35
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36 def __init__(self, *args, **kwargs):
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37 cmd.Cmd.__init__(self, *args, **kwargs)
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38 self.history = History()
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39
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40 def precmd(self, line):
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41 """Hook method executed just before the command line is
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42 interpreted, but after the input prompt is generated and issued.
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43
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44 Makes commands case-insensitive (but unfortunately does not alter command completion).
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45 """
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46 try:
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47 (command, args) = line.split(None,1)
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48 except ValueError:
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49 (command, args) = line, ''
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50 if self.caseInsensitive:
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51 command = command.lower()
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52 statement = ' '.join([command, args])
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53 if (not self.multilineCommands) or (command not in self.multilineCommands):
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54 return statement
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55 return self.finishStatement(statement)
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56
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57 def postcmd(self, stop, line):
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58 """Hook method executed just after a command dispatch is finished."""
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59 try:
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60 command = line.split(None,1)[0].lower()
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61 if command not in self.excludeFromHistory:
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62 self.history.append(line)
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63 finally:
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64 return stop
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65
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66 def finishStatement(self, firstline):
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67 statement = firstline
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68 while not self.statementHasEnded(statement):
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69 statement = '%s\n%s' % (statement, self.pseudo_raw_input(self.continuationPrompt))
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70 return statement
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71 # assembling a list of lines and joining them at the end would be faster,
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72 # but statementHasEnded needs a string arg; anyway, we're getting
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73 # user input and users are slow.
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74
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75 def pseudo_raw_input(self, prompt):
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76 """copied from cmd's cmdloop; like raw_input, but accounts for changed stdin, stdout"""
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77
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78 if self.use_rawinput:
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79 try:
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80 line = raw_input(prompt)
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81 except EOFError:
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82 line = 'EOF'
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83 else:
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84 self.stdout.write(prompt)
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85 self.stdout.flush()
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86 line = self.stdin.readline()
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87 if not len(line):
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88 line = 'EOF'
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89 else:
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90 line = line[:-1] # chop \n
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91 return line
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92
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93 def do_EOF(self, arg):
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94 return True
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95 do_eof = do_EOF
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96
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97 statementEndPattern = re.compile(r'[%s]\s*$' % terminators)
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98 def statementHasEnded(self, lines):
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99 return bool(self.statementEndPattern.search(lines))
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100
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101 def clean(self, s):
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102 """cleans up a string"""
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103 if self.caseInsensitive:
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104 return s.strip().lower()
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105 return s.strip()
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106
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107 def parseline(self, line):
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108 """Parse the line into a command name and a string containing
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109 the arguments. Returns a tuple containing (command, args, line).
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110 'command' and 'args' may be None if the line couldn't be parsed.
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111 """
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112 line = line.strip()
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113 if not line:
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114 return None, None, line
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115 shortcut = self.shortcuts.get(line[0])
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116 if shortcut and hasattr(self, 'do_%s' % shortcut):
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117 line = '%s %s' % (shortcut, line[1:])
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118 i, n = 0, len(line)
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119 while i < n and line[i] in self.identchars: i = i+1
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120 cmd, arg = line[:i], line[i:].strip().strip(self.terminators)
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121 return cmd, arg, line
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122
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123 def showParam(self, param):
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124 param = self.clean(param)
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125 if param in self.settable:
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126 val = getattr(self, param)
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 24
diff changeset
127 self.stdout.write('%s: %s\n' % (param, str(getattr(self, param))))
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parents: 24
diff changeset
128
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parents: 24
diff changeset
129 def do_show(self, arg):
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parents: 24
diff changeset
130 'Shows value of a parameter'
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parents: 24
diff changeset
131 if arg.strip():
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parents: 24
diff changeset
132 self.showParam(arg)
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diff changeset
133 else:
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parents: 24
diff changeset
134 for param in self.settable:
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parents: 24
diff changeset
135 self.showParam(param)
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parents: 24
diff changeset
136
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parents: 24
diff changeset
137 def do_set(self, arg):
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 24
diff changeset
138 'Sets a parameter'
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parents: 24
diff changeset
139 try:
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parents: 24
diff changeset
140 paramName, val = arg.split(None, 1)
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parents: 24
diff changeset
141 paramName = self.clean(paramName)
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parents: 24
diff changeset
142 if paramName not in self.settable:
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parents: 24
diff changeset
143 raise NotSettableError
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parents: 24
diff changeset
144 currentVal = getattr(self, paramName)
26
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parents: 25
diff changeset
145 val = cast(currentVal, val.strip(self.terminators))
25
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diff changeset
146 setattr(self, paramName, val)
26
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parents: 25
diff changeset
147 self.stdout.write('%s - was: %s\nnow: %s\n' % (paramName, currentVal, val))
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parents: 25
diff changeset
148 except (ValueError, AttributeError, NotSettableError):
25
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diff changeset
149 self.do_show(arg)
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diff changeset
150
20
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parents: 19
diff changeset
151 def do_shell(self, arg):
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parents: 19
diff changeset
152 'execute a command as if at the OS prompt.'
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diff changeset
153 os.system(arg)
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diff changeset
154
16
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parents:
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155 def do_history(self, arg):
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parents:
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156 """history [arg]: lists past commands issued
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parents:
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157
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parents:
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158 no arg -> list all
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parents:
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159 arg is integer -> list one history item, by index
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parents:
diff changeset
160 arg is string -> string search
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parents:
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161 arg is /enclosed in forward-slashes/ -> regular expression search
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parents:
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162 """
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parents:
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163 if arg:
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parents:
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164 history = self.history.get(arg)
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parents:
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165 else:
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parents:
diff changeset
166 history = self.history
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parents:
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167 for hi in history:
21
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parents: 20
diff changeset
168 self.stdout.write(hi.pr())
16
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parents:
diff changeset
169 def last_matching(self, arg):
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parents:
diff changeset
170 try:
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parents:
diff changeset
171 if arg:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
172 return self.history.get(arg)[-1]
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
173 else:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
174 return self.history[-1]
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
175 except:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
176 return None
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
177 def do_list(self, arg):
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parents:
diff changeset
178 """list [arg]: lists last command issued
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parents:
diff changeset
179
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parents:
diff changeset
180 no arg -> list absolute last
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parents:
diff changeset
181 arg is integer -> list one history item, by index
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parents:
diff changeset
182 - arg, arg - (integer) -> list up to or after #arg
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parents:
diff changeset
183 arg is string -> list last command matching string search
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parents:
diff changeset
184 arg is /enclosed in forward-slashes/ -> regular expression search
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parents:
diff changeset
185 """
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parents:
diff changeset
186 try:
21
8b55aaa52ce9 working on load, and preserving stdin/out
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parents: 20
diff changeset
187 self.stdout.write(self.last_matching(arg).pr())
16
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
188 except:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
189 pass
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parents:
diff changeset
190 do_hi = do_history
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parents:
diff changeset
191 do_l = do_list
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parents:
diff changeset
192 do_li = do_list
21
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parents: 20
diff changeset
193
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diff changeset
194 def do_load(self, fname):
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parents: 20
diff changeset
195 """Runs command(s) from a file."""
24
7a89805a47b1 load cleaned up
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parents: 23
diff changeset
196 keepstate = Statekeeper(self, ('stdin','use_rawinput','prompt','continuationPrompt'))
21
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parents: 20
diff changeset
197 try:
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parents: 20
diff changeset
198 self.stdin = open(fname, 'r')
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parents: 20
diff changeset
199 except IOError, e:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 20
diff changeset
200 try:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 20
diff changeset
201 self.stdin = open('%s.%s' % (fname, self.defaultExtension), 'r')
24
7a89805a47b1 load cleaned up
devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 23
diff changeset
202 self.use_rawinput = False
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 23
diff changeset
203 self.prompt = self.continuationPrompt = ''
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parents: 23
diff changeset
204 self.cmdloop()
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 23
diff changeset
205 self.stdin.close()
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parents: 23
diff changeset
206 self.lastcmd = ''
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parents: 23
diff changeset
207 except IOError:
21
8b55aaa52ce9 working on load, and preserving stdin/out
devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 20
diff changeset
208 print 'Problem opening file %s: \n%s' % (fname, e)
24
7a89805a47b1 load cleaned up
devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 23
diff changeset
209 finally:
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parents: 23
diff changeset
210 keepstate.restore()
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parents: 23
diff changeset
211
20
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parents: 19
diff changeset
212 class HistoryItem(str):
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parents: 19
diff changeset
213 def __init__(self, instr):
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parents: 19
diff changeset
214 str.__init__(self, instr)
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parents: 19
diff changeset
215 self.lowercase = self.lower()
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parents: 19
diff changeset
216 self.idx = None
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parents: 19
diff changeset
217 def pr(self):
21
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 20
diff changeset
218 return '-------------------------[%d]\n%s\n' % (self.idx, str(self))
20
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parents: 19
diff changeset
219
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
220 class History(list):
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parents: 19
diff changeset
221 rangeFrom = re.compile(r'^([\d])+\s*\-$')
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
222 def append(self, new):
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
223 new = HistoryItem(new)
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parents: 19
diff changeset
224 list.append(self, new)
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parents: 19
diff changeset
225 new.idx = len(self)
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diff changeset
226 def extend(self, new):
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parents: 19
diff changeset
227 for n in new:
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diff changeset
228 self.append(n)
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diff changeset
229 def get(self, getme):
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parents: 19
diff changeset
230 try:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
231 getme = int(getme)
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
232 if getme < 0:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
233 return self[:(-1 * getme)]
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
234 else:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
235 return [self[getme-1]]
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
236 except IndexError:
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
237 return []
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parents: 19
diff changeset
238 except (ValueError, TypeError):
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parents: 19
diff changeset
239 getme = getme.strip()
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
240 mtch = self.rangeFrom.search(getme)
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
241 if mtch:
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parents: 19
diff changeset
242 return self[(int(mtch.group(1))-1):]
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
243 if getme.startswith(r'/') and getme.endswith(r'/'):
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
244 finder = re.compile(getme[1:-1], re.DOTALL | re.MULTILINE | re.IGNORECASE)
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 19
diff changeset
245 def isin(hi):
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parents: 19
diff changeset
246 return finder.search(hi)
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parents: 19
diff changeset
247 else:
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parents: 19
diff changeset
248 def isin(hi):
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parents: 19
diff changeset
249 return (getme.lower() in hi.lowercase)
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parents: 19
diff changeset
250 return [itm for itm in self if isin(itm)]
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parents: 19
diff changeset
251
25
c99853267a44 introducing parameters
devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 24
diff changeset
252 class NotSettableError(Exception):
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 24
diff changeset
253 None
16
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devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents:
diff changeset
254
26
bb3fb24b6f5f settables ironed out
devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil
parents: 25
diff changeset
255 def cast(current, new):
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256 """Tries to force a new value into the same type as the current."""
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257 typ = type(current)
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258 print type(new)
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259 if typ == bool:
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260 new = new.lower()
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261 print new
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262 try:
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263 print new == 'on'
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264 if (new=='on') or (new[0] in ('y','t')):
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265 return True
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266 try:
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267 return bool(int(new))
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268 except ValueError:
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269 pass
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270 return False
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271 except TypeError:
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272 pass
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273 try:
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274 return typ(new)
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275 except:
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276 print "Problem setting parameter (now %s) to %s; incorrect type?" % (current, new)
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277 return current
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278
25
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279 class Statekeeper(object):
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280 def __init__(self, obj, attribs):
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281 self.obj = obj
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282 self.attribs = attribs
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283 self.save()
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284 def save(self):
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285 for attrib in self.attribs:
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286 setattr(self, attrib, getattr(self.obj, attrib))
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287 def restore(self):
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288 for attrib in self.attribs:
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289 setattr(self.obj, attrib, getattr(self, attrib))