Mercurial > diff-colorize

annotate diff-colorize.py @ 22:948c96784f00 1.0

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Added line to usage message identifying this as diff-colorize 1.0.
author Peter Hosey <hg@boredzo.org>
date Wed, 05 Jan 2011 21:04:42 -0800
parents 54a209909531
children d2bb1603f081
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python
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2
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3 import sys
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4 import os
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5 import fileinput
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6
15
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7 has_256_color = (os.environ.get('TERM', None) == 'xterm-256color')
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8
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9 index_color = int(os.environ.get('DIFF_INDEX_COLOR',
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10 32 if has_256_color else 36))
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11 old_mode_color = int(os.environ.get('DIFF_OLD_MODE_COLOR',
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12 88 if has_256_color else 31))
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13 new_mode_color = int(os.environ.get('DIFF_NEW_MODE_COLOR',
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14 28 if has_256_color else 32))
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15 removed_color = int(os.environ.get('DIFF_REMOVED_COLOR',
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16 160 if has_256_color else 31))
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17 added_color = int(os.environ.get('DIFF_ADDED_COLOR',
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18 2 if has_256_color else 32))
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19 hunk_start_color = int(os.environ.get('DIFF_HUNK_START_COLOR',
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20 32 if has_256_color else 36))
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21
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22 RESET_FORMAT = '\033[0m'
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23 COLOR_FORMAT_256 = '\033[38;5;%um'
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24 COLOR_FORMAT_16 = '\033[38;%um'
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25 COLOR_FORMAT = COLOR_FORMAT_256 if has_256_color else COLOR_FORMAT_16
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26 BEGIN_REVERSE_FORMAT = '\033[7m'
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27 END_REVERSE_FORMAT = '\033[27m'
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28
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29 USAGE = """
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30 diff-colorize 1.0 by Peter Hosey
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31
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32 Usage: diff ... | diff-colorize
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33 or: diff-colorize < foo.diff
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34
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35 Reads unified or git-style diff data from standard input, colorizes it, and writes the result to standard output.
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36
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37 You can customize the color numbers used by setting these variables in your environment:
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38 * DIFF_INDEX_COLOR (lines starting with "Index: " or "diff --git ")
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39 * DIFF_OLD_MODE_COLOR (lines starting with "old mode"; these only appear in git-style diffs)
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40 * DIFF_NEW_MODE_COLOR (lines starting with "new mode"; these only appear in git-style diffs)
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41 * DIFF_REMOVED_COLOR (lines starting with "-")
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42 * DIFF_ADDED_COLOR (lines starting with "+")
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43 * DIFF_HUNK_START_COLOR (lines starting with "@@")
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44 """.strip()
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45
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46 # Everything in the unified diff format is identified by a prefix. The prefixes are:
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47 # 'Index: ': File marker (unified diff)
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48 # 'diff --git': File marker (git-style diff)
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49 # 'old mode': File permissions mode before change
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50 # 'new mode': File permissions mode after change
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51 # '---': Defining '-' (giving the name and modification date of the file before change)
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52 # '+++': Defining '+' (giving the name and modification date of the file after change)
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53 # '-': Line before change (i.e., removed)
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54 # '+': Line after change (i.e., added)
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55 # ' ': Line that hasn't changed
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56 # '@@': Hunk start (@@ -start,length +start, length @@)
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57 #
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58 # We need to look for these prefixes in order, in order to handle '---'/'+++' before '-'/'+'. Hence the OrderedDict.
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59 class OrderedDict(dict):
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60 def __init__(self, input=None):
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61 if input is None:
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62 self.keys = []
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63 super(OrderedDict, self).__init__()
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64 elif isinstance(input, dict):
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65 self.keys = list(input)
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66 super(OrderedDict, self).__init__(input)
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67 else:
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68 self.keys = [k for k, v in input]
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69 super(OrderedDict, self).__init__(input)
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70 def __iter__(self):
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71 return iter(self.keys)
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72 def __setitem__(self, k, v):
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73 if k not in self:
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74 self.keys.append(k)
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75 super(OrderedDict, self).__setitem__(k, v)
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76 def __delitem__(self, k):
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77 super(OrderedDict, self).__delitem__(k)
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78 self.keys.remove(k)
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79
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80 # Each value includes not only the terminal-config characters, but also the key, somewhere within it (possibly between two terminal-config strings).
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81 # Theoretically, you could replace the key with some other string or leave it out entirely, if you wanted to, but I wouldn't recommend it.
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82 prefixes = OrderedDict()
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83 prefixes['---'] = (
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84 COLOR_FORMAT % (removed_color,)
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85 + BEGIN_REVERSE_FORMAT
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86 + '---'
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87 + END_REVERSE_FORMAT
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88 )
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89 prefixes['+++'] = (
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90 COLOR_FORMAT % (added_color,)
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91 + BEGIN_REVERSE_FORMAT
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92 + '+++'
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93 + END_REVERSE_FORMAT
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94 )
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95 prefixes['-'] = (
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96 COLOR_FORMAT % (removed_color,)
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97 + BEGIN_REVERSE_FORMAT
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98 + '-'
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99 + END_REVERSE_FORMAT
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100 )
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101 prefixes['+'] = (
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102 COLOR_FORMAT % (added_color,)
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103 + BEGIN_REVERSE_FORMAT
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104 + '+'
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105 + END_REVERSE_FORMAT
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106 )
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107 prefixes['old mode'] = ( # Git-style diffs only
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108 COLOR_FORMAT % (old_mode_color,)
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109 + BEGIN_REVERSE_FORMAT
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110 + 'old mode'
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111 + END_REVERSE_FORMAT
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112 )
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113 prefixes['new mode'] = ( # Git-style diffs only
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114 COLOR_FORMAT % (new_mode_color,)
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115 + BEGIN_REVERSE_FORMAT
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116 + 'new mode'
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117 + END_REVERSE_FORMAT
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118 )
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119 prefixes['Index: '] = COLOR_FORMAT % (index_color,) + 'Index: '
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120 prefixes['diff --git '] = COLOR_FORMAT % (index_color,) + 'diff --git '
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121 prefixes['@@'] = (
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122 COLOR_FORMAT % (hunk_start_color,)
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123 + BEGIN_REVERSE_FORMAT
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124 + '@@'
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125 )
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126
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127 if __name__ == "__main__":
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128 if sys.stdin.isatty():
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129 # Standard input is a TTY, meaning that the user ran 'diff-colorize' at the shell prompt, without redirecting anything into it. Print usage info and exit.
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130 sys.exit(USAGE)
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131
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132 for line in fileinput.input():
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133 for prefix_to_test in prefixes:
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134 if line.startswith(prefix_to_test):
54a209909531 Make the file importable for debugging purposes by wrapping the main-program-only bits in an if __name__ == "__main__" block.
Peter Hosey <hg@boredzo.org>
parents: 15
diff changeset
135 sys.stdout.write(prefixes[prefix_to_test])
54a209909531 Make the file importable for debugging purposes by wrapping the main-program-only bits in an if __name__ == "__main__" block.
Peter Hosey <hg@boredzo.org>
parents: 15
diff changeset
136 line = line[len(prefix_to_test):]
0
2df4ed64a388 Initial check-in of first working version.
Peter Hosey
parents:
diff changeset
137
17
54a209909531 Make the file importable for debugging purposes by wrapping the main-program-only bits in an if __name__ == "__main__" block.
Peter Hosey <hg@boredzo.org>
parents: 15
diff changeset
138 sys.stdout.write(line)
0
2df4ed64a388 Initial check-in of first working version.
Peter Hosey
parents:
diff changeset
139
17
54a209909531 Make the file importable for debugging purposes by wrapping the main-program-only bits in an if __name__ == "__main__" block.
Peter Hosey <hg@boredzo.org>
parents: 15
diff changeset
140 sys.stdout.write(RESET_FORMAT)