Mercurial > cpython-lru_cache-weakref

annotate Lib/sndhdr.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 4c0b37d869ca
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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c4692046b482 Got rid of whatraw().
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1 """Routines to help recognizing sound files.
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2
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3 Function whathdr() recognizes various types of sound file headers.
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4 It understands almost all headers that SOX can decode.
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5
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6 The return tuple contains the following items, in this order:
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7 - file type (as SOX understands it)
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8 - sampling rate (0 if unknown or hard to decode)
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9 - number of channels (0 if unknown or hard to decode)
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10 - number of frames in the file (-1 if unknown or hard to decode)
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11 - number of bits/sample, or 'U' for U-LAW, or 'A' for A-LAW
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12
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13 If the file doesn't have a recognizable type, it returns None.
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14 If the file can't be opened, IOError is raised.
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15
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16 To compute the total time, divide the number of frames by the
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17 sampling rate (a frame contains a sample for each channel).
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18
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19 Function what() calls whathdr(). (It used to also use some
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20 heuristics for raw data, but this doesn't work very well.)
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21
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22 Finally, the function test() is a simple main program that calls
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23 what() for all files mentioned on the argument list. For directory
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24 arguments it calls what() for all files in that directory. Default
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25 argument is "." (testing all files in the current directory). The
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26 option -r tells it to recurse down directories found inside
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27 explicitly given directories.
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28 """
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29
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30 # The file structure is top-down except that the test program and its
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31 # subroutine come last.
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32
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f68dbffff927 bunch more __all__ lists
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33 __all__ = ["what","whathdr"]
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34
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35 def what(filename):
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36 """Guess the type of a sound file"""
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37 res = whathdr(filename)
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38 return res
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40
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41 def whathdr(filename):
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42 """Recognize sound headers"""
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43 f = open(filename, 'rb')
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44 h = f.read(512)
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45 for tf in tests:
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46 res = tf(h, f)
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47 if res:
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48 return res
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49 return None
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51
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52 #-----------------------------------#
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53 # Subroutines per sound header type #
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54 #-----------------------------------#
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55
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56 tests = []
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57
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58 def test_aifc(h, f):
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59 import aifc
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60 if h[:4] != 'FORM':
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61 return None
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62 if h[8:12] == 'AIFC':
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63 fmt = 'aifc'
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64 elif h[8:12] == 'AIFF':
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65 fmt = 'aiff'
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66 else:
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67 return None
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68 f.seek(0)
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69 try:
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70 a = aifc.openfp(f, 'r')
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71 except (EOFError, aifc.Error):
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72 return None
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73 return (fmt, a.getframerate(), a.getnchannels(), \
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74 a.getnframes(), 8*a.getsampwidth())
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75
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76 tests.append(test_aifc)
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78
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79 def test_au(h, f):
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80 if h[:4] == '.snd':
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81 f = get_long_be
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82 elif h[:4] in ('\0ds.', 'dns.'):
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83 f = get_long_le
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84 else:
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85 return None
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86 type = 'au'
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87 hdr_size = f(h[4:8])
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88 data_size = f(h[8:12])
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89 encoding = f(h[12:16])
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90 rate = f(h[16:20])
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91 nchannels = f(h[20:24])
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92 sample_size = 1 # default
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93 if encoding == 1:
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94 sample_bits = 'U'
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95 elif encoding == 2:
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96 sample_bits = 8
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97 elif encoding == 3:
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98 sample_bits = 16
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99 sample_size = 2
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100 else:
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101 sample_bits = '?'
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102 frame_size = sample_size * nchannels
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103 return type, rate, nchannels, data_size//frame_size, sample_bits
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104
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105 tests.append(test_au)
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106
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107
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108 def test_hcom(h, f):
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109 if h[65:69] != 'FSSD' or h[128:132] != 'HCOM':
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110 return None
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111 divisor = get_long_be(h[128+16:128+20])
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112 return 'hcom', 22050//divisor, 1, -1, 8
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114 tests.append(test_hcom)
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115
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116
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117 def test_voc(h, f):
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118 if h[:20] != 'Creative Voice File\032':
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119 return None
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120 sbseek = get_short_le(h[20:22])
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121 rate = 0
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122 if 0 <= sbseek < 500 and h[sbseek] == '\1':
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123 ratecode = ord(h[sbseek+4])
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124 rate = int(1000000.0 / (256 - ratecode))
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125 return 'voc', rate, 1, -1, 8
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127 tests.append(test_voc)
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128
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129
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130 def test_wav(h, f):
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131 # 'RIFF' <len> 'WAVE' 'fmt ' <len>
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132 if h[:4] != 'RIFF' or h[8:12] != 'WAVE' or h[12:16] != 'fmt ':
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133 return None
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134 style = get_short_le(h[20:22])
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135 nchannels = get_short_le(h[22:24])
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136 rate = get_long_le(h[24:28])
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137 sample_bits = get_short_le(h[34:36])
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138 return 'wav', rate, nchannels, -1, sample_bits
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139
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140 tests.append(test_wav)
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141
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142
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143 def test_8svx(h, f):
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144 if h[:4] != 'FORM' or h[8:12] != '8SVX':
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145 return None
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146 # Should decode it to get #channels -- assume always 1
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147 return '8svx', 0, 1, 0, 8
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148
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149 tests.append(test_8svx)
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150
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151
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152 def test_sndt(h, f):
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153 if h[:5] == 'SOUND':
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154 nsamples = get_long_le(h[8:12])
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155 rate = get_short_le(h[20:22])
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156 return 'sndt', rate, 1, nsamples, 8
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157
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158 tests.append(test_sndt)
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159
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160
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161 def test_sndr(h, f):
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162 if h[:2] == '\0\0':
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163 rate = get_short_le(h[2:4])
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164 if 4000 <= rate <= 25000:
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165 return 'sndr', rate, 1, -1, 8
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166
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167 tests.append(test_sndr)
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168
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169
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170 #---------------------------------------------#
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171 # Subroutines to extract numbers from strings #
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172 #---------------------------------------------#
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173
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174 def get_long_be(s):
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175 return (ord(s[0])<<24) | (ord(s[1])<<16) | (ord(s[2])<<8) | ord(s[3])
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176
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177 def get_long_le(s):
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178 return (ord(s[3])<<24) | (ord(s[2])<<16) | (ord(s[1])<<8) | ord(s[0])
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179
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180 def get_short_be(s):
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181 return (ord(s[0])<<8) | ord(s[1])
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182
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183 def get_short_le(s):
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184 return (ord(s[1])<<8) | ord(s[0])
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185
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186
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187 #--------------------#
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188 # Small test program #
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189 #--------------------#
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190
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191 def test():
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192 import sys
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193 recursive = 0
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194 if sys.argv[1:] and sys.argv[1] == '-r':
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195 del sys.argv[1:2]
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196 recursive = 1
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197 try:
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198 if sys.argv[1:]:
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199 testall(sys.argv[1:], recursive, 1)
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200 else:
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201 testall(['.'], recursive, 1)
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202 except KeyboardInterrupt:
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203 sys.stderr.write('\n[Interrupted]\n')
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204 sys.exit(1)
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205
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206 def testall(list, recursive, toplevel):
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207 import sys
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208 import os
3685ef2a55a4 Whitespace normalization.
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209 for filename in list:
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210 if os.path.isdir(filename):
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211 print filename + '/:',
3685ef2a55a4 Whitespace normalization.
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212 if recursive or toplevel:
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213 print 'recursing down:'
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214 import glob
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215 names = glob.glob(os.path.join(filename, '*'))
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216 testall(names, recursive, 0)
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217 else:
3685ef2a55a4 Whitespace normalization.
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218 print '*** directory (use -r) ***'
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219 else:
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220 print filename + ':',
3685ef2a55a4 Whitespace normalization.
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221 sys.stdout.flush()
3685ef2a55a4 Whitespace normalization.
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diff changeset
222 try:
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223 print what(filename)
3685ef2a55a4 Whitespace normalization.
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224 except IOError:
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225 print '*** not found ***'
9779
c4692046b482 Got rid of whatraw().
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226
c4692046b482 Got rid of whatraw().
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diff changeset
227 if __name__ == '__main__':
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228 test()