lib/python/init.py

   1 # This is startup file for interactive python.
   2 # It is not automatically loaded by python interpreter.
   3 # To instruct the interpreter to load it insert the following commands
   4 # into your .profile (use whatever syntax and initialization file
   5 # is appropriate for your shell):
   6 #
   7 # PYTHONSTARTUP=$HOME/init.py  # or where you really put it
   8 # export PYTHONSTARTUP
   9
  10
  11 def init():
  12     import __builtin__
  13     import os
  14     import sys
  15
  16     # readline/pyreadline
  17
  18     pyreadlinew32_startup = os.path.join(
  19         sys.prefix, 'lib', 'site-packages',
  20         'pyreadline', 'configuration', 'startup.py')
  21
  22     if os.path.exists(pyreadlinew32_startup):
  23         execfile(pyreadlinew32_startup)
  24
  25     else:
  26         # From Bruce Edge:
  27         # https://mail.python.org/pipermail/python-list/2001-March/062888.html
  28
  29         try:
  30             import rlcompleter  # noqa: need for completion
  31             import readline
  32             initfile = os.environ.get('INPUTRC') \
  33                 or os.path.expanduser('~/.inputrc')
  34             readline.read_init_file(initfile)
  35
  36             histfile = os.path.expanduser('~/.python-history')
  37             try:
  38                 readline.read_history_file(histfile)
  39             except IOError:
  40                 pass  # No such file
  41
  42             def savehist():
  43                 histfilesize = os.environ.get('HISTFILESIZE') \
  44                     or os.environ.get('HISTSIZE')
  45                 if histfilesize:
  46                     try:
  47                         histfilesize = int(histfilesize)
  48                     except ValueError:
  49                         pass
  50                     else:
  51                         readline.set_history_length(histfilesize)
  52                 readline.write_history_file(histfile)
  53
  54             import atexit
  55             atexit.register(savehist)
  56
  57         except (ImportError, AttributeError):
  58             # no readline or atexit, or readline doesn't have
  59             # {read,write}_history_file - ignore the error
  60             pass
  61
  62     # terminal
  63
  64     term = os.environ.get('TERM', '')
  65     if 'linux' in term:
  66         background = 'dark'
  67     else:
  68         background = os.environ.get('BACKGROUND', 'light').lower()
  69
  70     # From Randall Hopper:
  71     # https://mail.python.org/pipermail/python-list/2001-March/112696.html
  72
  73     for _term in ['linux', 'rxvt', 'screen', 'term', 'vt100']:
  74         if _term not in term:
  75             continue
  76
  77         if background == 'dark':
  78             ps1_color = '3'  # yellow
  79             stdout_color = '7'  # bold white
  80         else:
  81             ps1_color = '4'  # blue
  82             stdout_color = '0'  # bold black
  83
  84         sys.ps1 = '\001\033[3%sm\002>>>\001\033[0m\002 ' % ps1_color
  85         sys.ps2 = '\001\033[1;32m\002...\001\033[0m\002 '  # bold green
  86
  87         # From Denis Otkidach
  88
  89         class ColoredFile:
  90             def __init__(self, fp, begin,
  91                          end='\033[0m'):  # reset all attributes
  92                 self.__fp = fp
  93                 self.__begin = begin
  94                 self.__end = end
  95
  96             def write(self, s):
  97                 self.__fp.write(self.__begin+s+self.__end)
  98
  99             def writelines(self, lines):
 100                 map(self.write, lines)
 101
 102             def __getattr__(self, attr):
 103                 return getattr(self.__fp, attr)
 104
 105         sys.stdout = ColoredFile(sys.stdout, '\033[1;3%sm' % stdout_color)
 106         sys.stderr = ColoredFile(sys.stderr, '\033[31m')  # red
 107
 108         break
 109
 110     try:
 111         import locale
 112     except ImportError:
 113         pass  # locale was not compiled
 114     else:
 115         try:
 116             locale.setlocale(locale.LC_ALL, '')
 117         except (ImportError, locale.Error):
 118             pass  # no locale support or unsupported locale
 119
 120     # set displayhook
 121
 122     from pprint import pprint
 123     pager = os.environ.get("PAGER") or 'more'
 124
 125     class BasePager:
 126         def write(self, value):
 127             self.stdin.write(value)
 128
 129         def pprint(self, value):
 130             pprint(value, stream=self.stdin)
 131
 132         def close(self):
 133             self.stdin.close()
 134
 135     try:
 136         from subprocess import Popen, PIPE
 137     except ImportError:
 138         class Pager(BasePager):
 139             def __init__(self):
 140                 self.pipe = Popen(pager, shell=True, stdin=PIPE)
 141                 self.stdin = self.pipe.stdin
 142
 143             def close(self):
 144                 BasePager.close(self)
 145                 self.pipe.wait()
 146     else:
 147         class Pager(BasePager):
 148             def __init__(self):
 149                 self.stdin = os.popen(pager, 'w')
 150
 151     def displayhook(value):
 152         if value is not None:
 153             __builtin__._ = value
 154         pager = Pager()
 155         pager.pprint(value)
 156         pager.close()
 157
 158     sys.displayhook = displayhook
 159
 160     from traceback import format_exception
 161
 162     def excepthook(etype, evalue, etraceback):
 163         lines = format_exception(etype, evalue, etraceback)
 164         pager = Pager()
 165         for line in lines:
 166             pager.write(
 167                 '\033[31m' + line.rstrip('\n') + '\033[0m\n')  # red, reset
 168         pager.close()
 169
 170     sys.excepthook = excepthook
 171
 172     # From Thomas Heller:
 173     # https://mail.python.org/pipermail/python-list/2001-April/099020.html
 174
 175     # import pdb
 176     #
 177     # def info(*args):
 178     #    pdb.pm()
 179     # sys.excepthook = info
 180
 181     # utilities
 182
 183     # From: Paul Magwene:
 184     # https://mail.python.org/pipermail/python-list/2001-March/086191.html
 185     # With a lot of my fixes:
 186
 187     class DirLister:
 188         def __getitem__(self, key):
 189             s = os.listdir(os.curdir)
 190             return s[key]
 191
 192         def __getslice__(self, i, j):
 193             s = os.listdir(os.curdir)
 194             return s[i:j]
 195
 196         def __repr__(self):
 197             return str(os.listdir(os.curdir))
 198
 199         def __call__(self, path=None):
 200             if path:
 201                 path = os.path.expanduser(os.path.expandvars(path))
 202             else:
 203                 path = os.curdir
 204             return os.listdir(path)
 205
 206     class DirChanger:
 207         def __repr__(self):
 208             self()
 209             return os.getcwd()
 210
 211         def __call__(self, path=None):
 212             path = os.path.expanduser(os.path.expandvars(path or '~'))
 213             os.chdir(path)
 214
 215     __builtin__.ls = DirLister()
 216     __builtin__.cd = DirChanger()
 217
 218     # print working directory
 219
 220     class Pwd:
 221         def __repr__(self):
 222             return os.getcwd()
 223
 224         def __call__(self):
 225             return repr(self)
 226
 227     __builtin__.pwd = Pwd()
 228
 229     # exit REPL with 'exit', 'quit' or simple 'x'
 230
 231     class _Exit:
 232         def __repr__(self):
 233             sys.exit()
 234
 235         def __call__(self, msg=None):
 236             sys.exit(msg)
 237
 238     __builtin__.x = _Exit()
 239
 240     # In Python 2.5+ exit and quit are objects
 241     if isinstance(__builtin__.exit, str):
 242         __builtin__.exit = __builtin__.quit = x  # noqa: x is defined as _Exit
 243
 244     # print conten of a file
 245
 246     class _Cat:
 247         def __repr__(self):
 248             return "Usage: cat('filename')"
 249
 250         def __call__(self, filename):
 251             fp = open(filename, 'rU')
 252             text = fp.read()
 253             fp.close()
 254             print text
 255
 256     __builtin__.cat = _Cat()
 257
 258     # call shell
 259
 260     class _Sh:
 261         def __repr__(self):
 262             os.system(os.environ["SHELL"])
 263             return ''
 264
 265         def __call__(self, cmdline):
 266             os.system(cmdline)
 267
 268     __builtin__.sh = _Sh()
 269
 270     # paginate a file
 271
 272     class _Pager:
 273         def __repr__(self):
 274             return "Usage: pager('filename')"
 275
 276         def __call__(self, filename):
 277             os.system("%s '%s'" % (pager, filename.replace("'", '"\'"')))
 278
 279     __builtin__.pager = _Pager()
 280
 281     # edit a file
 282
 283     class _Editor:
 284         def __repr__(self):
 285             return "Usage: edit('filename')"
 286
 287         def __call__(self, filename):
 288             editor = os.environ.get("VISUAL") \
 289                 or os.environ.get("EDITOR") or 'vi'
 290             os.system("%s '%s'" % (editor, filename.replace("'", '"\'"')))
 291
 292     __builtin__.edit = __builtin__.editor = _Editor()
 293
 294
 295 init()
 296 del init