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1 | #!/usr/bin/env python |
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1 | #!/usr/bin/env python | |
2 | """Module for interactively running scripts. |
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2 | """Module for interactively running scripts. | |
3 |
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3 | |||
4 | This module implements classes for interactively running scripts written for |
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4 | This module implements classes for interactively running scripts written for | |
5 | any system with a prompt which can be matched by a regexp suitable for |
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5 | any system with a prompt which can be matched by a regexp suitable for | |
6 | pexpect. It can be used to run as if they had been typed up interactively, an |
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6 | pexpect. It can be used to run as if they had been typed up interactively, an | |
7 | arbitrary series of commands for the target system. |
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7 | arbitrary series of commands for the target system. | |
8 |
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8 | |||
9 | The module includes classes ready for IPython (with the default prompts), |
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9 | The module includes classes ready for IPython (with the default prompts), | |
10 | plain Python and SAGE, but making a new one is trivial. To see how to use it, |
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10 | plain Python and SAGE, but making a new one is trivial. To see how to use it, | |
11 | simply run the module as a script: |
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11 | simply run the module as a script: | |
12 |
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12 | |||
13 | ./irunner.py --help |
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13 | ./irunner.py --help | |
14 |
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14 | |||
15 |
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15 | |||
16 | This is an extension of Ken Schutte <kschutte-AT-csail.mit.edu>'s script |
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16 | This is an extension of Ken Schutte <kschutte-AT-csail.mit.edu>'s script | |
17 | contributed on the ipython-user list: |
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17 | contributed on the ipython-user list: | |
18 |
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18 | |||
19 | http://scipy.net/pipermail/ipython-user/2006-May/001705.html |
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19 | http://scipy.net/pipermail/ipython-user/2006-May/001705.html | |
20 |
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20 | |||
21 |
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21 | |||
22 | NOTES: |
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22 | NOTES: | |
23 |
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23 | |||
24 | - This module requires pexpect, available in most linux distros, or which can |
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24 | - This module requires pexpect, available in most linux distros, or which can | |
25 | be downloaded from |
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25 | be downloaded from | |
26 |
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26 | |||
27 | http://pexpect.sourceforge.net |
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27 | http://pexpect.sourceforge.net | |
28 |
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28 | |||
29 | - Because pexpect only works under Unix or Windows-Cygwin, this has the same |
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29 | - Because pexpect only works under Unix or Windows-Cygwin, this has the same | |
30 | limitations. This means that it will NOT work under native windows Python. |
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30 | limitations. This means that it will NOT work under native windows Python. | |
31 | """ |
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31 | """ | |
32 |
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32 | |||
33 | # Stdlib imports |
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33 | # Stdlib imports | |
34 | import optparse |
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34 | import optparse | |
35 | import os |
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35 | import os | |
36 | import sys |
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36 | import sys | |
37 |
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37 | |||
38 | # Third-party modules. |
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38 | # Third-party modules. | |
39 | import pexpect |
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39 | import pexpect | |
40 |
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40 | |||
41 | # Global usage strings, to avoid indentation issues when typing it below. |
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41 | # Global usage strings, to avoid indentation issues when typing it below. | |
42 | USAGE = """ |
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42 | USAGE = """ | |
43 | Interactive script runner, type: %s |
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43 | Interactive script runner, type: %s | |
44 |
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44 | |||
45 | runner [opts] script_name |
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45 | runner [opts] script_name | |
46 | """ |
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46 | """ | |
47 |
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47 | |||
48 | # The generic runner class |
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48 | # The generic runner class | |
49 | class InteractiveRunner(object): |
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49 | class InteractiveRunner(object): | |
50 | """Class to run a sequence of commands through an interactive program.""" |
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50 | """Class to run a sequence of commands through an interactive program.""" | |
51 |
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51 | |||
52 | def __init__(self,program,prompts,args=None): |
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52 | def __init__(self,program,prompts,args=None): | |
53 | """Construct a runner. |
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53 | """Construct a runner. | |
54 |
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54 | |||
55 | Inputs: |
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55 | Inputs: | |
56 |
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56 | |||
57 | - program: command to execute the given program. |
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57 | - program: command to execute the given program. | |
58 |
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58 | |||
59 | - prompts: a list of patterns to match as valid prompts, in the |
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59 | - prompts: a list of patterns to match as valid prompts, in the | |
60 | format used by pexpect. This basically means that it can be either |
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60 | format used by pexpect. This basically means that it can be either | |
61 | a string (to be compiled as a regular expression) or a list of such |
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61 | a string (to be compiled as a regular expression) or a list of such | |
62 | (it must be a true list, as pexpect does type checks). |
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62 | (it must be a true list, as pexpect does type checks). | |
63 |
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63 | |||
64 | If more than one prompt is given, the first is treated as the main |
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64 | If more than one prompt is given, the first is treated as the main | |
65 | program prompt and the others as 'continuation' prompts, like |
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65 | program prompt and the others as 'continuation' prompts, like | |
66 | python's. This means that blank lines in the input source are |
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66 | python's. This means that blank lines in the input source are | |
67 | ommitted when the first prompt is matched, but are NOT ommitted when |
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67 | ommitted when the first prompt is matched, but are NOT ommitted when | |
68 | the continuation one matches, since this is how python signals the |
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68 | the continuation one matches, since this is how python signals the | |
69 | end of multiline input interactively. |
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69 | end of multiline input interactively. | |
70 |
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70 | |||
71 | Optional inputs: |
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71 | Optional inputs: | |
72 |
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72 | |||
73 | - args(None): optional list of strings to pass as arguments to the |
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73 | - args(None): optional list of strings to pass as arguments to the | |
74 | child program. |
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74 | child program. | |
75 |
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75 | |||
76 | Public members not parameterized in the constructor: |
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76 | Public members not parameterized in the constructor: | |
77 |
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77 | |||
78 | - delaybeforesend(0): Newer versions of pexpect have a delay before |
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78 | - delaybeforesend(0): Newer versions of pexpect have a delay before | |
79 | sending each new input. For our purposes here, it's typically best |
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79 | sending each new input. For our purposes here, it's typically best | |
80 | to just set this to zero, but if you encounter reliability problems |
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80 | to just set this to zero, but if you encounter reliability problems | |
81 | or want an interactive run to pause briefly at each prompt, just |
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81 | or want an interactive run to pause briefly at each prompt, just | |
82 | increase this value (it is measured in seconds). Note that this |
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82 | increase this value (it is measured in seconds). Note that this | |
83 | variable is not honored at all by older versions of pexpect. |
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83 | variable is not honored at all by older versions of pexpect. | |
84 | """ |
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84 | """ | |
85 |
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85 | |||
86 | self.program = program |
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86 | self.program = program | |
87 | self.prompts = prompts |
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87 | self.prompts = prompts | |
88 | if args is None: args = [] |
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88 | if args is None: args = [] | |
89 | self.args = args |
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89 | self.args = args | |
90 | # Other public members which we don't make as parameters, but which |
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90 | # Other public members which we don't make as parameters, but which | |
91 | # users may occasionally want to tweak |
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91 | # users may occasionally want to tweak | |
92 | self.delaybeforesend = 0 |
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92 | self.delaybeforesend = 0 | |
93 |
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93 | |||
94 | def run_file(self,fname,interact=False): |
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94 | def run_file(self,fname,interact=False): | |
95 | """Run the given file interactively. |
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95 | """Run the given file interactively. | |
96 |
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96 | |||
97 | Inputs: |
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97 | Inputs: | |
98 |
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98 | |||
99 | -fname: name of the file to execute. |
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99 | -fname: name of the file to execute. | |
100 |
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100 | |||
101 | See the run_source docstring for the meaning of the optional |
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101 | See the run_source docstring for the meaning of the optional | |
102 | arguments.""" |
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102 | arguments.""" | |
103 |
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103 | |||
104 | fobj = open(fname,'r') |
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104 | fobj = open(fname,'r') | |
105 | try: |
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105 | try: | |
106 | self.run_source(fobj,interact) |
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106 | self.run_source(fobj,interact) | |
107 | finally: |
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107 | finally: | |
108 | fobj.close() |
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108 | fobj.close() | |
109 |
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109 | |||
110 | def run_source(self,source,interact=False): |
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110 | def run_source(self,source,interact=False): | |
111 | """Run the given source code interactively. |
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111 | """Run the given source code interactively. | |
112 |
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112 | |||
113 | Inputs: |
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113 | Inputs: | |
114 |
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114 | |||
115 | - source: a string of code to be executed, or an open file object we |
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115 | - source: a string of code to be executed, or an open file object we | |
116 | can iterate over. |
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116 | can iterate over. | |
117 |
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117 | |||
118 | Optional inputs: |
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118 | Optional inputs: | |
119 |
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119 | |||
120 | - interact(False): if true, start to interact with the running |
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120 | - interact(False): if true, start to interact with the running | |
121 | program at the end of the script. Otherwise, just exit. |
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121 | program at the end of the script. Otherwise, just exit. | |
122 | """ |
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122 | """ | |
123 |
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123 | |||
124 | # if the source is a string, chop it up in lines so we can iterate |
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124 | # if the source is a string, chop it up in lines so we can iterate | |
125 | # over it just as if it were an open file. |
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125 | # over it just as if it were an open file. | |
126 | if not isinstance(source,file): |
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126 | if not isinstance(source,file): | |
127 | source = source.splitlines(True) |
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127 | source = source.splitlines(True) | |
128 |
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128 | |||
129 | # grab the true write method of stdout, in case anything later |
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129 | # grab the true write method of stdout, in case anything later | |
130 | # reassigns sys.stdout, so that we really are writing to the true |
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130 | # reassigns sys.stdout, so that we really are writing to the true | |
131 | # stdout and not to something else. We also normalize all strings we |
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131 | # stdout and not to something else. We also normalize all strings we | |
132 | # write to use the native OS line separators. |
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132 | # write to use the native OS line separators. | |
133 | linesep = os.linesep |
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133 | linesep = os.linesep | |
134 | stdwrite = sys.stdout.write |
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134 | stdwrite = sys.stdout.write | |
135 | write = lambda s: stdwrite(s.replace('\r\n',linesep)) |
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135 | write = lambda s: stdwrite(s.replace('\r\n',linesep)) | |
136 |
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136 | |||
137 | c = pexpect.spawn(self.program,self.args,timeout=None) |
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137 | c = pexpect.spawn(self.program,self.args,timeout=None) | |
138 | c.delaybeforesend = self.delaybeforesend |
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138 | c.delaybeforesend = self.delaybeforesend | |
139 |
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139 | |||
140 | # pexpect hard-codes the terminal size as (24,80) (rows,columns). |
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140 | # pexpect hard-codes the terminal size as (24,80) (rows,columns). | |
141 | # This causes problems because any line longer than 80 characters gets |
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141 | # This causes problems because any line longer than 80 characters gets | |
142 | # completely overwrapped on the printed outptut (even though |
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142 | # completely overwrapped on the printed outptut (even though | |
143 | # internally the code runs fine). We reset this to 99 rows X 200 |
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143 | # internally the code runs fine). We reset this to 99 rows X 200 | |
144 | # columns (arbitrarily chosen), which should avoid problems in all |
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144 | # columns (arbitrarily chosen), which should avoid problems in all | |
145 | # reasonable cases. |
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145 | # reasonable cases. | |
146 | c.setwinsize(99,200) |
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146 | c.setwinsize(99,200) | |
147 |
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147 | |||
148 | prompts = c.compile_pattern_list(self.prompts) |
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148 | prompts = c.compile_pattern_list(self.prompts) | |
149 |
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149 | |||
150 | prompt_idx = c.expect_list(prompts) |
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150 | prompt_idx = c.expect_list(prompts) | |
151 | # Flag whether the script ends normally or not, to know whether we can |
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151 | # Flag whether the script ends normally or not, to know whether we can | |
152 | # do anything further with the underlying process. |
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152 | # do anything further with the underlying process. | |
153 | end_normal = True |
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153 | end_normal = True | |
154 | for cmd in source: |
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154 | for cmd in source: | |
155 | # skip blank lines for all matches to the 'main' prompt, while the |
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155 | # skip blank lines for all matches to the 'main' prompt, while the | |
156 | # secondary prompts do not |
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156 | # secondary prompts do not | |
157 | if prompt_idx==0 and \ |
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157 | if prompt_idx==0 and \ | |
158 | (cmd.isspace() or cmd.lstrip().startswith('#')): |
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158 | (cmd.isspace() or cmd.lstrip().startswith('#')): | |
159 | print cmd, |
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159 | print cmd, | |
160 | continue |
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160 | continue | |
161 |
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161 | |||
162 | write(c.after) |
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162 | write(c.after) | |
163 | c.send(cmd) |
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163 | c.send(cmd) | |
164 | try: |
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164 | try: | |
165 | prompt_idx = c.expect_list(prompts) |
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165 | prompt_idx = c.expect_list(prompts) | |
166 | except pexpect.EOF: |
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166 | except pexpect.EOF: | |
167 | # this will happen if the child dies unexpectedly |
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167 | # this will happen if the child dies unexpectedly | |
168 | write(c.before) |
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168 | write(c.before) | |
169 | end_normal = False |
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169 | end_normal = False | |
170 | break |
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170 | break | |
171 | write(c.before) |
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171 | write(c.before) | |
172 |
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172 | |||
173 | if end_normal: |
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173 | if end_normal: | |
174 | if interact: |
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174 | if interact: | |
175 | c.send('\n') |
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175 | c.send('\n') | |
176 | print '<< Starting interactive mode >>', |
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176 | print '<< Starting interactive mode >>', | |
177 | try: |
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177 | try: | |
178 | c.interact() |
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178 | c.interact() | |
179 | except OSError: |
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179 | except OSError: | |
180 | # This is what fires when the child stops. Simply print a |
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180 | # This is what fires when the child stops. Simply print a | |
181 | # newline so the system prompt is aligned. The extra |
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181 | # newline so the system prompt is aligned. The extra | |
182 | # space is there to make sure it gets printed, otherwise |
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182 | # space is there to make sure it gets printed, otherwise | |
183 | # OS buffering sometimes just suppresses it. |
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183 | # OS buffering sometimes just suppresses it. | |
184 | write(' \n') |
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184 | write(' \n') | |
185 | sys.stdout.flush() |
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185 | sys.stdout.flush() | |
186 | else: |
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186 | else: | |
187 | c.close() |
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187 | c.close() | |
188 | else: |
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188 | else: | |
189 | if interact: |
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189 | if interact: | |
190 | e="Further interaction is not possible: child process is dead." |
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190 | e="Further interaction is not possible: child process is dead." | |
191 | print >> sys.stderr, e |
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191 | print >> sys.stderr, e | |
192 |
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192 | |||
193 | def main(self,argv=None): |
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193 | def main(self,argv=None): | |
194 | """Run as a command-line script.""" |
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194 | """Run as a command-line script.""" | |
195 |
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195 | |||
196 | parser = optparse.OptionParser(usage=USAGE % self.__class__.__name__) |
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196 | parser = optparse.OptionParser(usage=USAGE % self.__class__.__name__) | |
197 | newopt = parser.add_option |
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197 | newopt = parser.add_option | |
198 | newopt('-i','--interact',action='store_true',default=False, |
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198 | newopt('-i','--interact',action='store_true',default=False, | |
199 | help='Interact with the program after the script is run.') |
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199 | help='Interact with the program after the script is run.') | |
200 |
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200 | |||
201 | opts,args = parser.parse_args(argv) |
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201 | opts,args = parser.parse_args(argv) | |
202 |
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202 | |||
203 | if len(args) != 1: |
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203 | if len(args) != 1: | |
204 | print >> sys.stderr,"You must supply exactly one file to run." |
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204 | print >> sys.stderr,"You must supply exactly one file to run." | |
205 | sys.exit(1) |
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205 | sys.exit(1) | |
206 |
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206 | |||
207 | self.run_file(args[0],opts.interact) |
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207 | self.run_file(args[0],opts.interact) | |
208 |
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208 | |||
209 |
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209 | |||
210 | # Specific runners for particular programs |
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210 | # Specific runners for particular programs | |
211 | class IPythonRunner(InteractiveRunner): |
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211 | class IPythonRunner(InteractiveRunner): | |
212 | """Interactive IPython runner. |
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212 | """Interactive IPython runner. | |
213 |
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213 | |||
214 | This initalizes IPython in 'nocolor' mode for simplicity. This lets us |
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214 | This initalizes IPython in 'nocolor' mode for simplicity. This lets us | |
215 | avoid having to write a regexp that matches ANSI sequences, though pexpect |
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215 | avoid having to write a regexp that matches ANSI sequences, though pexpect | |
216 | does support them. If anyone contributes patches for ANSI color support, |
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216 | does support them. If anyone contributes patches for ANSI color support, | |
217 | they will be welcome. |
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217 | they will be welcome. | |
218 |
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218 | |||
219 | It also sets the prompts manually, since the prompt regexps for |
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219 | It also sets the prompts manually, since the prompt regexps for | |
220 | pexpect need to be matched to the actual prompts, so user-customized |
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220 | pexpect need to be matched to the actual prompts, so user-customized | |
221 | prompts would break this. |
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221 | prompts would break this. | |
222 | """ |
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222 | """ | |
223 |
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223 | |||
224 | def __init__(self,program = 'ipython',args=None): |
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224 | def __init__(self,program = 'ipython',args=None): | |
225 | """New runner, optionally passing the ipython command to use.""" |
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225 | """New runner, optionally passing the ipython command to use.""" | |
226 |
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226 | |||
227 | args0 = ['-colors','NoColor', |
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227 | args0 = ['-colors','NoColor', | |
228 | '-pi1','In [\\#]: ', |
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228 | '-pi1','In [\\#]: ', | |
229 | '-pi2',' .\\D.: '] |
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229 | '-pi2',' .\\D.: '] | |
230 | if args is None: args = args0 |
|
230 | if args is None: args = args0 | |
231 | else: args = args0 + args |
|
231 | else: args = args0 + args | |
232 | prompts = [r'In \[\d+\]: ',r' \.*: '] |
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232 | prompts = [r'In \[\d+\]: ',r' \.*: '] | |
233 | InteractiveRunner.__init__(self,program,prompts,args) |
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233 | InteractiveRunner.__init__(self,program,prompts,args) | |
234 |
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234 | |||
235 |
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235 | |||
236 | class PythonRunner(InteractiveRunner): |
|
236 | class PythonRunner(InteractiveRunner): | |
237 | """Interactive Python runner.""" |
|
237 | """Interactive Python runner.""" | |
238 |
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238 | |||
239 | def __init__(self,program='python',args=None): |
|
239 | def __init__(self,program='python',args=None): | |
240 | """New runner, optionally passing the python command to use.""" |
|
240 | """New runner, optionally passing the python command to use.""" | |
241 |
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241 | |||
242 | prompts = [r'>>> ',r'\.\.\. '] |
|
242 | prompts = [r'>>> ',r'\.\.\. '] | |
243 | InteractiveRunner.__init__(self,program,prompts,args) |
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243 | InteractiveRunner.__init__(self,program,prompts,args) | |
244 |
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244 | |||
245 |
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245 | |||
246 | class SAGERunner(InteractiveRunner): |
|
246 | class SAGERunner(InteractiveRunner): | |
247 | """Interactive SAGE runner. |
|
247 | """Interactive SAGE runner. | |
248 |
|
248 | |||
249 | WARNING: this runner only works if you manually configure your SAGE copy |
|
249 | WARNING: this runner only works if you manually configure your SAGE copy | |
250 | to use 'colors NoColor' in the ipythonrc config file, since currently the |
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250 | to use 'colors NoColor' in the ipythonrc config file, since currently the | |
251 | prompt matching regexp does not identify color sequences.""" |
|
251 | prompt matching regexp does not identify color sequences.""" | |
252 |
|
252 | |||
253 | def __init__(self,program='sage',args=None): |
|
253 | def __init__(self,program='sage',args=None): | |
254 | """New runner, optionally passing the sage command to use.""" |
|
254 | """New runner, optionally passing the sage command to use.""" | |
255 |
|
255 | |||
256 | prompts = ['sage: ',r'\s*\.\.\. '] |
|
256 | prompts = ['sage: ',r'\s*\.\.\. '] | |
257 | InteractiveRunner.__init__(self,program,prompts,args) |
|
257 | InteractiveRunner.__init__(self,program,prompts,args) | |
258 |
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258 | |||
259 | # Global usage string, to avoid indentation issues if typed in a function def. |
|
259 | # Global usage string, to avoid indentation issues if typed in a function def. | |
260 | MAIN_USAGE = """ |
|
260 | MAIN_USAGE = """ | |
261 | %prog [options] file_to_run |
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261 | %prog [options] file_to_run | |
262 |
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262 | |||
263 | This is an interface to the various interactive runners available in this |
|
263 | This is an interface to the various interactive runners available in this | |
264 | module. If you want to pass specific options to one of the runners, you need |
|
264 | module. If you want to pass specific options to one of the runners, you need | |
265 | to first terminate the main options with a '--', and then provide the runner's |
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265 | to first terminate the main options with a '--', and then provide the runner's | |
266 | options. For example: |
|
266 | options. For example: | |
267 |
|
267 | |||
268 | irunner.py --python -- --help |
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268 | irunner.py --python -- --help | |
269 |
|
269 | |||
270 | will pass --help to the python runner. Similarly, |
|
270 | will pass --help to the python runner. Similarly, | |
271 |
|
271 | |||
272 | irunner.py --ipython -- --interact script.ipy |
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272 | irunner.py --ipython -- --interact script.ipy | |
273 |
|
273 | |||
274 | will run the script.ipy file under the IPython runner, and then will start to |
|
274 | will run the script.ipy file under the IPython runner, and then will start to | |
275 | interact with IPython at the end of the script (instead of exiting). |
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275 | interact with IPython at the end of the script (instead of exiting). | |
276 |
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276 | |||
277 | The already implemented runners are listed below; adding one for a new program |
|
277 | The already implemented runners are listed below; adding one for a new program | |
278 | is a trivial task, see the source for examples. |
|
278 | is a trivial task, see the source for examples. | |
279 |
|
279 | |||
280 | WARNING: the SAGE runner only works if you manually configure your SAGE copy |
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280 | WARNING: the SAGE runner only works if you manually configure your SAGE copy | |
281 | to use 'colors NoColor' in the ipythonrc config file, since currently the |
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281 | to use 'colors NoColor' in the ipythonrc config file, since currently the | |
282 | prompt matching regexp does not identify color sequences. |
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282 | prompt matching regexp does not identify color sequences. | |
283 | """ |
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283 | """ | |
284 |
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284 | |||
285 | def main(): |
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285 | def main(): | |
286 | """Run as a command-line script.""" |
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286 | """Run as a command-line script.""" | |
287 |
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287 | |||
288 | parser = optparse.OptionParser(usage=MAIN_USAGE) |
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288 | parser = optparse.OptionParser(usage=MAIN_USAGE) | |
289 | newopt = parser.add_option |
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289 | newopt = parser.add_option | |
290 | parser.set_defaults(mode='ipython') |
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290 | parser.set_defaults(mode='ipython') | |
291 | newopt('--ipython',action='store_const',dest='mode',const='ipython', |
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291 | newopt('--ipython',action='store_const',dest='mode',const='ipython', | |
292 | help='IPython interactive runner (default).') |
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292 | help='IPython interactive runner (default).') | |
293 | newopt('--python',action='store_const',dest='mode',const='python', |
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293 | newopt('--python',action='store_const',dest='mode',const='python', | |
294 | help='Python interactive runner.') |
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294 | help='Python interactive runner.') | |
295 | newopt('--sage',action='store_const',dest='mode',const='sage', |
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295 | newopt('--sage',action='store_const',dest='mode',const='sage', | |
296 | help='SAGE interactive runner.') |
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296 | help='SAGE interactive runner.') | |
297 |
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297 | |||
298 | opts,args = parser.parse_args() |
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298 | opts,args = parser.parse_args() | |
299 | runners = dict(ipython=IPythonRunner, |
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299 | runners = dict(ipython=IPythonRunner, | |
300 | python=PythonRunner, |
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300 | python=PythonRunner, | |
301 | sage=SAGERunner) |
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301 | sage=SAGERunner) | |
302 |
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302 | |||
303 | try: |
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303 | try: | |
304 | ext = os.path.splitext(args[0]) |
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304 | ext = os.path.splitext(args[0])[-1] | |
305 | except IndexError: |
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305 | except IndexError: | |
306 | ext = '' |
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306 | ext = '' | |
307 | modes = {'.ipy':'ipython', |
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307 | modes = {'.ipy':'ipython', | |
308 | '.py':'python', |
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308 | '.py':'python', | |
309 | '.sage':'sage'} |
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309 | '.sage':'sage'} | |
310 | mode = modes.get(ext,opts.mode) |
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310 | mode = modes.get(ext,opts.mode) | |
311 | runners[mode]().main(args) |
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311 | runners[mode]().main(args) | |
312 |
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312 | |||
313 | if __name__ == '__main__': |
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313 | if __name__ == '__main__': | |
314 | main() |
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314 | main() |
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