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annotate paint/info.py @ 58:13767ee2ddf4

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start adding an egg_info based information thingy
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 23 Jan 2013 16:59:36 -0800
parents d5e5c7496784
children acee5e882768
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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 class PackageInfo(object):
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13 """abstract base class of package info"""
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14 def __init__(self, path):
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15 """
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16 - path : path to setup.py or its directory
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17 """
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18 if os.path.isdir(path):
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19 path = os.path.join(path, 'setup.py')
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20 assert os.path.exists(path), "'%s' not found" % path
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21 self.setup_py = os.path.abspath(path)
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22
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23 def __call__(self):
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24 """returns dictionary of package info"""
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25 raise NotImplementedError("abstract base class")
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26
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27 class SetupOverridePackageInfo(PackageInfo):
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28 """
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29 gather setup.py information by overriding the function
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30 """
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31
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32 def __call__(self):
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33 setuptools = sys.modules.get('setuptools')
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34 sys.modules['setuptools'] = sys.modules[__name__]
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35 globals()['setup'] = self._setup
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36 try:
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37 module = imp.load_source('setup', self.setup_py)
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38 finally:
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39 sys.modules.pop('setuptools')
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40 if setuptools:
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41 sys.modules['setuptools'] = setuptools
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42 globals().pop('setup')
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43 return self.__dict__.pop('_info')
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44
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45 def _setup(self, **kwargs):
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46 self._info = kwargs
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47
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48 class EggInfo(PackageInfo):
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49 """
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50 use `python setup.py egg_info` to gather package information
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51 """
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52
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53 def __call__(self):
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54
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55 info = self.read_pkg_info(self._pkg_info())
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56 # TODO: install_requires
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57 return info
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58
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59 @classmethod
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60 def read_pkg_info(cls, path):
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61 """reads PKG-INFO and returns a dict"""
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62
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63 # read the package information
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64 info_dict = {}
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65 for line in file(path).readlines():
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66 if not line or line[0].isspace():
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67 continue # XXX neglects description
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68 assert ':' in line
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69 key, value = [i.strip() for i in line.split(':', 1)]
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70 info_dict[key] = value
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71
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72 # return the information
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73 return info_dict
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74
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75 def _egg_info(self):
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76 """build the egg_info directory"""
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77
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78 if self._egg_info_path:
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79 return self._egg_info_path
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80
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81 directory = os.path.dirname(self.setup_py)
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82
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83 # setup the egg info
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84 try:
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85 call([sys.executable, 'setup.py', 'egg_info'], cwd=directory, stdout=subprocess.PIPE)
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86 except Exception:
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87 print "Failure to generate egg_info: %s" % self.setup_py
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88 raise
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89
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90 # get the .egg-info directory
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91 egg_info = [i for i in os.listdir(directory)
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92 if i.endswith('.egg-info')]
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93 assert len(egg_info) == 1, 'Expected one .egg-info directory in %s, got: %s' % (directory, egg_info)
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94 egg_info = os.path.join(directory, egg_info[0])
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95 assert os.path.isdir(egg_info), "%s is not a directory" % egg_info
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96
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97 # cache it
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98 self._egg_info_path = egg_info
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99 return self._egg_info_path
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100
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101 def _pkg_info(self):
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102 """returns path to PKG-INFO file"""
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103
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104 if self._pkg_info_path:
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105 # return cached value
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106 return self._pkg_info_path
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107
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108 try:
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109 egg_info = self._egg_info()
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110 except Exception, exception:
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111 # try to get the package info from a file
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112 path = os.path.dirname(self.setup_py)
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113 pkg_info = os.path.join(path, 'PKG-INFO')
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114 if os.path.exists(pkg_info):
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115 self._pkg_info_path = pkg_info
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116 return self._pkg_info_path
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117 raise Exception("Cannot find or generate PKG-INFO")
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118
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119 pkg_info = os.path.join(egg_info, 'PKG-INFO')
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120 assert os.path.exists(pkg_info)
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121 self._pkg_info_path = pkg_info
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122 return self._pkg_info_path
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123