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=$HOME/init.py  # or where you really put it
   8 # export PYTHONSTARTUP
   9
  10
  11 def init():
  12     try:
  13         import __builtin__ as builtins
  14     except ImportError:
  15         import builtins
  16     import os
  17     import sys
  18
  19     # readline/pyreadline
  20
  21     pyreadlinew32_startup = os.path.join(
  22         sys.prefix, 'lib', 'site-packages',
  23         'pyreadline', 'configuration', 'startup.py')
  24
  25     if os.path.exists(pyreadlinew32_startup):
  26         execfile(pyreadlinew32_startup)
  27
  28     else:
  29         # From Bruce Edge:
  30         # https://mail.python.org/pipermail/python-list/2001-March/062888.html
  31
  32         try:
  33             import rlcompleter  # noqa: need for completion
  34             import readline
  35             initfile = os.environ.get('INPUTRC') \
  36                 or os.path.expanduser('~/.inputrc')
  37             readline.read_init_file(initfile)
  38
  39             # if 'libedit' in readline.__doc__:
  40             #     readline.parse_and_bind("bind ^I rl_complete")
  41             # else:
  42             #     readline.parse_and_bind("tab: complete")
  43
  44             histfiles = ['~/.python_history']
  45             # if 'VIRTUAL_ENV' in os.environ:
  46             #     histfiles.append('$VIRTUAL_ENV/.python_history')
  47             for histfile in histfiles:
  48                 try:
  49                     histfile = os.path.expandvars(histfile)
  50                     histfile = os.path.expanduser(histfile)
  51                     readline.read_history_file(histfile)
  52                 except IOError:
  53                     pass  # No such file
  54
  55             def savehist():
  56                 histsize = os.environ.get('HISTSIZE')
  57                 if histsize:
  58                     try:
  59                         histsize = int(histsize)
  60                     except ValueError:
  61                         pass
  62                     else:
  63                         readline.set_history_length(histsize)
  64                 histfile = histfiles[-1]
  65                 histfile = os.path.expandvars(histfile)
  66                 histfile = os.path.expanduser(histfile)
  67                 readline.write_history_file(histfile)
  68
  69             import atexit
  70             atexit.register(savehist)
  71
  72         except (ImportError, AttributeError):
  73             # no readline or atexit, or readline doesn't have
  74             # {read,write}_history_file - ignore the error
  75             pass
  76
  77     # terminal
  78
  79     term = os.environ.get('TERM', '')
  80     if 'linux' in term:
  81         background = 'dark'
  82     else:
  83         background = os.environ.get('BACKGROUND', 'light').lower()
  84
  85     # From Randall Hopper:
  86     # https://mail.python.org/pipermail/python-list/2001-March/112696.html
  87
  88     _term_found = False
  89     for _term in ['linux', 'rxvt', 'screen', 'term', 'vt100']:
  90         if _term in term:
  91             _term_found = True
  92             break
  93
  94     if _term_found:
  95         if background == 'dark':
  96             ps1_color = '3'  # yellow
  97             stdout_color = '7'  # bold white
  98         else:
  99             ps1_color = '4'  # blue
 100             stdout_color = '0'  # bold black
 101
 102         sys.ps1 = '\001\033[3%sm\002>>>\001\033[0m\002 ' % ps1_color
 103         sys.ps2 = '\001\033[1;32m\002...\001\033[0m\002 '  # bold green
 104
 105         # From Denis Otkidach
 106
 107         class ColoredFile:
 108             def __init__(self, fp, begin,
 109                          end='\033[0m'):  # reset all attributes
 110                 self.__fp = fp
 111                 self.__begin = begin
 112                 self.__end = end
 113
 114             def write(self, s):
 115                 self.__fp.write(self.__begin+s+self.__end)
 116
 117             def writelines(self, lines):
 118                 map(self.write, lines)
 119
 120             def __getattr__(self, attr):
 121                 return getattr(self.__fp, attr)
 122
 123         sys.stdout = ColoredFile(sys.stdout, '\033[1;3%sm' % stdout_color)
 124         sys.stderr = ColoredFile(sys.stderr, '\033[31m')  # red
 125
 126         def myinput(prompt=None):
 127             save_stdout = sys.stdout
 128             sys.stdout = sys.__stdout__
 129             try:
 130                 result = builtin_input(prompt)
 131             except EOFError:
 132                 result = None
 133             sys.stdout = save_stdout
 134             return result
 135
 136         try:
 137             builtins.raw_input
 138         except AttributeError:  # PY3
 139             builtin_input = builtins.input
 140             builtins.input = myinput
 141         else:
 142             builtin_input = builtins.raw_input
 143             builtins.raw_input = myinput
 144
 145     try:
 146         import locale
 147     except ImportError:
 148         pass  # locale was not compiled
 149     else:
 150         try:
 151             locale.setlocale(locale.LC_ALL, '')
 152         except (ImportError, locale.Error):
 153             pass  # no locale support or unsupported locale
 154
 155     # set displayhook and excepthook
 156
 157     from pprint import pprint
 158     from traceback import format_exception, print_exc
 159
 160     pager = os.environ.get("PAGER") or 'more'
 161
 162     # if your pager is 'less', options '-F' and '-R' must be passed to it,
 163     # and option '-X' is very much recommended
 164     if pager == 'less':
 165         less = os.environ.get("LESS") or ''
 166         for opt in 'X', 'R', 'F':
 167             if opt not in less:
 168                 less = opt + less
 169         os.environ["LESS"] = less
 170
 171     class BasePager:
 172         def write(self, value):
 173             self.stdout.write(value)
 174
 175         def pprint(self, value):
 176             pprint(value,
 177                    stream=ColoredFile(self.stdout,
 178                                       '\033[1;3%sm' % stdout_color))
 179
 180         def close(self):
 181             self.stdout.close()
 182
 183     try:
 184         from subprocess import Popen, PIPE
 185     except ImportError:
 186         class Pager(BasePager):
 187             def __init__(self):
 188                 self.stdout = os.popen(pager, 'w')
 189     else:
 190         class Pager(BasePager):
 191             def __init__(self):
 192                 self.pipe = Popen(pager, shell=True, stdin=PIPE,
 193                                   universal_newlines=True)
 194                 self.stdout = self.pipe.stdin
 195
 196             def close(self):
 197                 BasePager.close(self)
 198                 self.pipe.wait()
 199
 200     def displayhook(value):
 201         if value is not None:
 202             builtins._ = value
 203         pager = Pager()
 204         try:
 205             pager.pprint(value)
 206         except:  # noqa
 207             pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 208             print_exc(file=pager)
 209         pager.close()
 210
 211     sys.displayhook = displayhook
 212
 213     def excepthook(etype, evalue, etraceback):
 214         lines = format_exception(etype, evalue, etraceback)
 215         pager = Pager()
 216         pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 217         for line in lines:
 218             pager.write(line)
 219         pager.close()
 220
 221     sys.excepthook = excepthook
 222
 223     # try:
 224     #     import cgitb
 225     # except ImportError:
 226     #     pass
 227     # else:
 228     #     # cgitb.enable() overrides sys.excepthook
 229     #     cgitb.enable(format='text')
 230
 231     # From Thomas Heller:
 232     # https://mail.python.org/pipermail/python-list/2001-April/099020.html
 233
 234     # import pdb
 235     #
 236     # def info(*args):
 237     #    pdb.pm()
 238     # sys.excepthook = info
 239
 240     # utilities
 241
 242     # From: Paul Magwene:
 243     # https://mail.python.org/pipermail/python-list/2001-March/086191.html
 244     # With a lot of my fixes:
 245
 246     class DirLister:
 247         def __getitem__(self, key):
 248             s = os.listdir(os.curdir)
 249             return s[key]
 250
 251         def __getslice__(self, i, j):
 252             s = os.listdir(os.curdir)
 253             return s[i:j]
 254
 255         def __repr__(self):
 256             return str(os.listdir(os.curdir))
 257
 258         def __call__(self, path=None):
 259             if path:
 260                 path = os.path.expanduser(os.path.expandvars(path))
 261             else:
 262                 path = os.curdir
 263             return os.listdir(path)
 264
 265     class DirChanger:
 266         def __repr__(self):
 267             self()
 268             return os.getcwd()
 269
 270         def __call__(self, path=None):
 271             path = os.path.expanduser(os.path.expandvars(path or '~'))
 272             os.chdir(path)
 273
 274     builtins.ls = DirLister()
 275     builtins.cd = DirChanger()
 276
 277     # print working directory
 278
 279     class Pwd:
 280         def __repr__(self):
 281             return os.getcwd()
 282
 283         def __call__(self):
 284             return repr(self)
 285
 286     builtins.pwd = Pwd()
 287
 288     # exit REPL with 'exit', 'quit' or simple 'x'
 289
 290     class _Exit:
 291         def __repr__(self):
 292             sys.exit()
 293
 294         def __call__(self, msg=None):
 295             sys.exit(msg)
 296
 297     builtins.x = _Exit()
 298
 299     # print conten of a file
 300
 301     class _Cat:
 302         def __repr__(self):
 303             return "Usage: cat('filename')"
 304
 305         def __call__(self, filename):
 306             fp = open(filename, 'rU')
 307             text = fp.read()
 308             fp.close()
 309             print(text)
 310
 311     builtins.cat = _Cat()
 312
 313     # call shell
 314
 315     class _Sh:
 316         def __repr__(self):
 317             os.system(os.environ["SHELL"])
 318             return ''
 319
 320         def __call__(self, cmdline):
 321             os.system(cmdline)
 322
 323     builtins.sh = _Sh()
 324
 325     # paginate a file
 326
 327     class _Pager:
 328         def __repr__(self):
 329             return "Usage: pager('filename')"
 330
 331         def __call__(self, filename):
 332             os.system("%s '%s'" % (pager, filename.replace("'", '"\'"')))
 333
 334     builtins.pager = _Pager()
 335
 336     # edit a file
 337
 338     class _Editor:
 339         def __repr__(self):
 340             return "Usage: edit('filename')"
 341
 342         def __call__(self, filename):
 343             editor = os.environ.get("VISUAL") \
 344                 or os.environ.get("EDITOR") or 'vi'
 345             os.system("%s '%s'" % (editor, filename.replace("'", '"\'"')))
 346
 347     builtins.edit = builtins.editor = _Editor()
 348
 349
 350 init()
 351 del init