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bos@3
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1 #!/usr/bin/python
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2 #
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3 # This program takes something that resembles a shell script and runs
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4 # it, spitting input (commands from the script) and output into text
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5 # files, for use in examples.
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6
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7 import cStringIO
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8 import os
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9 import pty
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10 import re
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11 import shutil
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12 import signal
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13 import sys
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14 import tempfile
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15 import time
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16
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17 def tex_escape(s):
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18 if '\\' in s:
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19 s = s.replace('\\', '\\\\')
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20 if '{' in s:
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21 s = s.replace('{', '\\{')
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22 if '}' in s:
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23 s = s.replace('}', '\\}')
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24 return s
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25
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26 class example:
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27 shell = '/bin/bash'
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28 prompt = '__run_example_prompt__\n'
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29 pi_re = re.compile('#\$\s*(name):\s*(.*)$')
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30
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31 def __init__(self, name):
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32 self.name = name
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33
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34 def parse(self):
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35 '''yield each hunk of input from the file.'''
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36 fp = open(self.name)
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37 cfp = cStringIO.StringIO()
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38 for line in fp:
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39 cfp.write(line)
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40 if not line.rstrip().endswith('\\'):
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41 yield cfp.getvalue()
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42 cfp.seek(0)
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43 cfp.truncate()
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44
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45 def status(self, s):
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46 sys.stdout.write(s)
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47 if not s.endswith('\n'):
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48 sys.stdout.flush()
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49
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50 def send(self, s):
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51 self.cfp.write(s)
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52 self.cfp.flush()
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53
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54 def receive(self):
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55 out = cStringIO.StringIO()
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56 while True:
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57 s = self.cfp.readline().replace('\r\n', '\n')
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58 if not s or s == self.prompt:
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59 break
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60 out.write(s)
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61 return out.getvalue()
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62
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63 def sendreceive(self, s):
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64 self.send(s)
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65 r = self.receive()
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66 if r.startswith(s):
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67 r = r[len(s):]
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68 return r
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69
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70 def run(self):
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71 ofp = None
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72 basename = os.path.basename(self.name)
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73 self.status('running %s ' % basename)
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74 tmpdir = tempfile.mkdtemp(prefix=basename)
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75 rcfile = os.path.join(tmpdir, '.bashrc')
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76 rcfp = open(rcfile, 'w')
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77 print >> rcfp, 'PS1="%s"' % self.prompt
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78 print >> rcfp, 'unset HISTFILE'
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79 print >> rcfp, 'export LANG=C'
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80 print >> rcfp, 'export LC_ALL=C'
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81 print >> rcfp, 'export TZ=GMT'
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82 print >> rcfp, 'export HGRC="%s/.hgrc"' % tmpdir
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83 print >> rcfp, 'export HGRCPATH=$HGRC'
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84 print >> rcfp, 'cd %s' % tmpdir
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85 rcfp.close()
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86 pid, fd = pty.fork()
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87 if pid == 0:
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88 #os.execl(self.shell, self.shell)
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89 os.system('/bin/bash --noediting --noprofile --norc')
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90 sys.exit(0)
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91 self.cfp = os.fdopen(fd, 'w+')
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92 try:
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93 # setup env and prompt
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94 self.sendreceive('source %s\n\n' % rcfile)
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95 for hunk in self.parse():
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96 # is this line a processing instruction?
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97 m = self.pi_re.match(hunk)
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98 if m:
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99 pi, rest = m.groups()
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100 if pi == 'name':
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101 self.status('.')
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102 out = rest
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103 assert os.sep not in out
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104 if out:
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105 ofp = open('%s.%s.out' % (self.name, out), 'w')
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106 else:
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107 ofp = None
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108 elif hunk.strip():
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109 # it's something we should execute
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110 output = self.sendreceive(hunk)
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111 if not ofp:
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112 continue
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113 # first, print the command we ran
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114 if not hunk.startswith('#'):
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115 nl = hunk.endswith('\n')
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116 hunk = ('$ \\textbf{%s}' %
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117 tex_escape(hunk.rstrip('\n')))
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118 if nl: hunk += '\n'
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119 ofp.write(hunk)
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120 # then its output
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121 ofp.write(output)
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122 self.status('\n')
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123 finally:
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124 try:
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125 output = self.sendreceive('exit\n')
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126 if ofp:
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127 ofp.write(output)
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128 self.cfp.close()
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129 except IOError:
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130 pass
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131 os.kill(pid, signal.SIGTERM)
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132 os.wait()
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133 shutil.rmtree(tmpdir)
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134
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135 def main(path='.'):
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136 args = sys.argv[1:]
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137 if args:
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138 for a in args:
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139 example(a).run()
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140 return
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141 for name in os.listdir(path):
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142 if name == 'run-example' or name.startswith('.'): continue
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143 if name.endswith('.out') or name.endswith('~'): continue
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144 example(os.path.join(path, name)).run()
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145 print >> open(os.path.join(path, '.run'), 'w'), time.asctime()
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146
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147 if __name__ == '__main__':
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148 main()
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