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annotate roundup/support.py @ 4433:e35e57ad90f0 1.4.16

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release stuff
author Richard Jones <richard@users.sourceforge.net>
date Fri, 08 Oct 2010 03:35:51 +0000
parents 193f316dbbe9
children 0a05c4d9a221
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1 """Implements various support classes and functions used in a number of
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2 places in Roundup code.
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3 """
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4
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5 __docformat__ = 'restructuredtext'
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6
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7 import os, time, sys, re
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8
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9 class TruthDict:
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10 '''Returns True for valid keys, False for others.
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11 '''
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12 def __init__(self, keys):
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13 if keys:
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14 self.keys = {}
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15 for col in keys:
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16 self.keys[col] = 1
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17 else:
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18 self.__getitem__ = lambda name: 1
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19
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20 def __getitem__(self, name):
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21 return self.keys.has_key(name)
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22
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23 def ensureParentsExist(dest):
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24 if not os.path.exists(os.path.dirname(dest)):
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25 os.makedirs(os.path.dirname(dest))
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26
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27 class PrioList:
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28 '''Manages a sorted list.
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29
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30 Currently only implements method 'append' and iteration from a
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31 full list interface.
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32 Implementation: We manage a "sorted" status and sort on demand.
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33 Appending to the list will require re-sorting before use.
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34 >>> p = PrioList()
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35 >>> for i in 5,7,1,-1:
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36 ... p.append(i)
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37 ...
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38 >>> for k in p:
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39 ... print k
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40 ...
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41 -1
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42 1
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43 5
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44 7
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45
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46 '''
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47 def __init__(self):
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48 self.list = []
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49 self.sorted = True
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50
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51 def append(self, item):
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52 self.list.append(item)
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53 self.sorted = False
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54
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55 def __iter__(self):
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56 if not self.sorted:
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57 self.list.sort()
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58 self.sorted = True
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59 return iter(self.list)
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60
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61 class Progress:
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62 '''Progress display for console applications.
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63
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64 See __main__ block at end of file for sample usage.
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65 '''
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66 def __init__(self, info, sequence):
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67 self.info = info
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68 self.sequence = iter(sequence)
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69 self.total = len(sequence)
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70 self.start = self.now = time.time()
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71 self.num = 0
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72 self.stepsize = self.total / 100 or 1
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73 self.steptimes = []
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74 self.display()
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75
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76 def __iter__(self): return self
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77
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78 def next(self):
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79 self.num += 1
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80
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81 if self.num > self.total:
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82 print self.info, 'done', ' '*(75-len(self.info)-6)
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83 sys.stdout.flush()
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84 return self.sequence.next()
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85
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86 if self.num % self.stepsize:
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87 return self.sequence.next()
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88
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89 self.display()
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90 return self.sequence.next()
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91
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92 def display(self):
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93 # figure how long we've spent - guess how long to go
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94 now = time.time()
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95 steptime = now - self.now
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96 self.steptimes.insert(0, steptime)
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97 if len(self.steptimes) > 5:
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98 self.steptimes.pop()
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99 steptime = sum(self.steptimes) / len(self.steptimes)
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100 self.now = now
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101 eta = steptime * ((self.total - self.num)/self.stepsize)
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102
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103 # tell it like it is (or might be)
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104 if now - self.start > 3:
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105 M = eta / 60
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106 H = M / 60
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107 M = M % 60
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108 S = eta % 60
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109 if self.total:
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110 s = '%s %2d%% (ETA %02d:%02d:%02d)'%(self.info,
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111 self.num * 100. / self.total, H, M, S)
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112 else:
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113 s = '%s 0%% (ETA %02d:%02d:%02d)'%(self.info, H, M, S)
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114 elif self.total:
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115 s = '%s %2d%%'%(self.info, self.num * 100. / self.total)
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116 else:
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117 s = '%s %d done'%(self.info, self.num)
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118 sys.stdout.write(s + ' '*(75-len(s)) + '\r')
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119 sys.stdout.flush()
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120
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121 LEFT = 'left'
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122 LEFTN = 'left no strip'
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123 RIGHT = 'right'
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124 CENTER = 'center'
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125
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126 def align(line, width=70, alignment=LEFTN):
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127 ''' Code from http://www.faqts.com/knowledge_base/view.phtml/aid/4476 '''
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128 if alignment == CENTER:
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129 line = line.strip()
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130 space = width - len(line)
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131 return ' '*(space/2) + line + ' '*(space/2 + space%2)
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132 elif alignment == RIGHT:
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133 line = line.rstrip()
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134 space = width - len(line)
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135 return ' '*space + line
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136 else:
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137 if alignment == LEFT:
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138 line = line.lstrip()
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139 space = width - len(line)
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140 return line + ' '*space
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141
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142
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143 def format_line(columns, positions, contents, spacer=' | ',
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144 collapse_whitespace=True, wsre=re.compile(r'\s+')):
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145 ''' Fill up a single row with data from the contents '''
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146 l = []
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147 data = 0
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148 for i in range(len(columns)):
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149 width, alignment = columns[i]
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150 content = contents[i]
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151 col = ''
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152 while positions[i] < len(content):
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153 word = content[positions[i]]
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154 # if we hit a newline, honor it
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155 if '\n' in word:
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156 # chomp
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157 positions[i] += 1
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158 break
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159
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160 # make sure this word fits
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161 if col and len(word) + len(col) > width:
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162 break
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163
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164 # no whitespace at start-of-line
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165 if collapse_whitespace and wsre.match(word) and not col:
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166 # chomp
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167 positions[i] += 1
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168 continue
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169
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170 col += word
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171 # chomp
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172 positions[i] += 1
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173 if col:
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174 data = 1
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175 col = align(col, width, alignment)
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176 l.append(col)
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177
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178 if not data:
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179 return ''
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180 return spacer.join(l).rstrip()
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181
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182
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183 def format_columns(columns, contents, spacer=' | ', collapse_whitespace=True,
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184 splitre=re.compile(r'(\n|\r\n|\r|[ \t]+|\S+)')):
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185 ''' Format the contents into columns, with 'spacing' between the
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186 columns
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187 '''
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188 assert len(columns) == len(contents), \
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189 'columns and contents must be same length'
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190
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191 # split the text into words, spaces/tabs and newlines
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192 for i in range(len(contents)):
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193 contents[i] = splitre.findall(contents[i])
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194
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195 # now process line by line
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196 l = []
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197 positions = [0]*len(contents)
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198 while 1:
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199 l.append(format_line(columns, positions, contents, spacer,
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200 collapse_whitespace))
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201
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202 # are we done?
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203 for i in range(len(contents)):
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204 if positions[i] < len(contents[i]):
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205 break
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206 else:
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207 break
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208 return '\n'.join(l)
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209
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210 def wrap(text, width=75, alignment=LEFTN):
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211 return format_columns(((width, alignment),), [text],
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212 collapse_whitespace=False)
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213
3682
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214 # Python2.3 backwards-compatibility-hack. Should be removed (and clients
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215 # fixed to use built-in reversed/sorted) when we abandon support for
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216 # python2.3
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217 try:
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218 reversed = reversed
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219 except NameError:
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220 def reversed(x):
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221 x = list(x)
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222 x.reverse()
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223 return x
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224
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225 try:
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226 sorted = sorted
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227 except NameError:
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228 def sorted(iter, cmp=None, key=None, reverse=False):
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229 if key:
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230 l = []
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231 cnt = 0 # cnt preserves original sort-order
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232 inc = [1, -1][bool(reverse)] # count down on reverse
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233 for x in iter:
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234 l.append ((key(x), cnt, x))
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235 cnt += inc
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236 else:
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237 l = list(iter)
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238 if cmp:
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239 l.sort(cmp = cmp)
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240 else:
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241 l.sort()
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242 if reverse:
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243 l.reverse()
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244 if key:
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245 return [x[-1] for x in l]
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246 return l
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247
2984
887d631ea2ba general use
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diff changeset
248 # vim: set et sts=4 sw=4 :
Roundup Issue Tracker: http://roundup-tracker.org/