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annotate paint/info.py @ 64:1a279bac0afa

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start moving this monster to a package information provider
author Jeff Hammel <jhammel@mozilla.com>
date Fri, 25 Jan 2013 13:41:37 -0800
parents 1234bfb1f1f0
children 8f39ba642531
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1 """
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2 interfaces to get information from a package
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3 """
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4
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5 import imp
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6 import os
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7 import subprocess
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8 import sys
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9
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10 from subprocess import check_call as call
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11
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12 # TODO:
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13 # Reconcile the difference between the keys (and values) between the different
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14 # implementations. Pick a canon and stick with it.
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15
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16 # SetupOverridePackageInfo:
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17 # {'entry_points': '\n', 'description': 'a dummy package', 'license': '', 'author': 'Jeff Hammel', 'install_requires': [], 'include_package_data': True, 'classifiers': [], 'url': 'http://example.com/', 'author_email': 'jhammel@mozilla.com', 'version': '0.1', 'zip_safe': False, 'packages': ['dummy'], 'long_description': 'dummy\n===========\n\na dummy package\n\n----\n\nJeff Hammel\n\nhttp://example.com/\n\n', 'name': 'dummy'}
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18
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19 # EggInfo:
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20 # {'Name': 'dummy', 'License': 'UNKNOWN', 'Author': 'Jeff Hammel', 'Metadata-Version': '1.0', 'Home-page': 'http://example.com/', 'Summary': 'a dummy package', 'Platform': 'UNKNOWN', 'Version': '0.1', 'Author-email': 'jhammel@mozilla.com', 'Description': 'dummy'}
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21
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23 class PackageInfo(object):
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24 """abstract base class of package info"""
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25 def __init__(self, path):
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26 """
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27 - path : path to setup.py or its directory
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28 """
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29 if os.path.isdir(path):
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30 path = os.path.join(path, 'setup.py')
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31 assert os.path.exists(path), "'%s' not found" % path
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32 self.setup_py = os.path.abspath(path)
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33
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34 def __call__(self):
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35 """returns dictionary of package info"""
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36 raise NotImplementedError("abstract base class")
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37
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38 class SetupOverridePackageInfo(PackageInfo):
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39 """
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40 gather setup.py information by overriding the function
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41 """
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42
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43 def __call__(self):
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44 setuptools = sys.modules.get('setuptools')
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45 sys.modules['setuptools'] = sys.modules[__name__]
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46 globals()['setup'] = self._setup
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47 try:
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48 module = imp.load_source('setup', self.setup_py)
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49 finally:
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50 sys.modules.pop('setuptools')
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51 if setuptools:
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52 sys.modules['setuptools'] = setuptools
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53 globals().pop('setup')
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54 return self.__dict__.pop('_info')
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55
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56 def _setup(self, **kwargs):
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57 self._info = kwargs
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58
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59 class EggInfo(PackageInfo):
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60 """
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61 use `python setup.py egg_info` to gather package information
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62 """
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63
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64 def __call__(self):
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65
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66 info = self.read_pkg_info(self._pkg_info())
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67 # TODO: install_requires
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68 return info
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69
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70 @classmethod
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71 def read_pkg_info(cls, path):
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72 """reads PKG-INFO and returns a dict"""
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73
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74 # read the package information
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75 info_dict = {}
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76 for line in file(path).readlines():
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77 if not line or line[0].isspace():
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78 continue # XXX neglects description
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79 assert ':' in line
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80 key, value = [i.strip() for i in line.split(':', 1)]
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81 info_dict[key] = value
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82
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83 # return the information
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84 return info_dict
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85
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86 def _egg_info(self):
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87 """build the egg_info directory"""
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88
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89 # cached result
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90 if getattr(self, '_egg_info_path', None):
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91 return self._egg_info_path
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92
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93 directory = os.path.dirname(self.setup_py)
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94
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95 # setup the egg info
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96 try:
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97 call([sys.executable, 'setup.py', 'egg_info'], cwd=directory, stdout=subprocess.PIPE)
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98 except Exception:
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99 print "Failure to generate egg_info: %s" % self.setup_py
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100 raise
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101
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102 # get the .egg-info directory
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103 egg_info = [i for i in os.listdir(directory)
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104 if i.endswith('.egg-info')]
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105 assert len(egg_info) == 1, 'Expected one .egg-info directory in %s, got: %s' % (directory, egg_info)
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106 egg_info = os.path.join(directory, egg_info[0])
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107 assert os.path.isdir(egg_info), "%s is not a directory" % egg_info
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108
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109 # cache it
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110 self._egg_info_path = egg_info
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111 return self._egg_info_path
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112
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113 def _pkg_info(self):
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114 """returns path to PKG-INFO file"""
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115
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116 if getattr(self, '_pkg_info_path', None):
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117 # return cached value
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118 return self._pkg_info_path
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119
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120 try:
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121 egg_info = self._egg_info()
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122 except Exception, exception:
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123 # try to get the package info from a file
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124 path = os.path.dirname(self.setup_py)
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125 pkg_info = os.path.join(path, 'PKG-INFO')
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126 if os.path.exists(pkg_info):
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127 self._pkg_info_path = pkg_info
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128 return self._pkg_info_path
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129 raise Exception("Cannot find or generate PKG-INFO")
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130
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131 pkg_info = os.path.join(egg_info, 'PKG-INFO')
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132 assert os.path.exists(pkg_info)
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133 self._pkg_info_path = pkg_info
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134 return self._pkg_info_path
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135