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                 try:
  68                     readline.write_history_file(histfile)
  69                 except IOError:
  70                     pass
  71
  72             import atexit
  73             atexit.register(savehist)
  74
  75         except (ImportError, AttributeError):
  76             # no readline or atexit, or readline doesn't have
  77             # {read,write}_history_file - ignore the error
  78             pass
  79
  80     # terminal
  81
  82     term = os.environ.get('TERM', '')
  83     for _term in ['cygwin', 'linux', 'putty']:
  84         if _term in term:
  85             background = 'dark'
  86             break
  87     else:
  88         background = os.environ.get('BACKGROUND', 'light').lower()
  89
  90     # From Randall Hopper:
  91     # https://mail.python.org/pipermail/python-list/2001-March/112696.html
  92
  93     _term_found = False
  94     for _term in ['cygwin', 'linux', 'putty', 'rxvt',
  95                   'screen', 'term', 'vt100']:
  96         if _term in term:
  97             _term_found = True
  98             break
  99
 100     if _term_found:
 101         if background == 'dark':
 102             ps1_color = '3'  # yellow
 103             stdout_color = '7'  # bold white
 104         else:
 105             ps1_color = '4'  # blue
 106             stdout_color = '0'  # bold black
 107
 108         sys.ps1 = '\001\033[3%sm\002>>>\001\033[0m\002 ' % ps1_color
 109         sys.ps2 = '\001\033[1;32m\002...\001\033[0m\002 '  # bold green
 110
 111         # From Denis Otkidach
 112
 113         class ColoredFile:
 114             def __init__(self, fp, begin,
 115                          end='\033[0m'):  # reset all attributes
 116                 self.__fp = fp
 117                 self.__begin = begin
 118                 self.__end = end
 119
 120             def write(self, s):
 121                 self.__fp.write(self.__begin+s+self.__end)
 122
 123             def writelines(self, lines):
 124                 map(self.write, lines)
 125
 126             def __getattr__(self, attr):
 127                 return getattr(self.__fp, attr)
 128
 129         sys.stdout = ColoredFile(sys.stdout, '\033[1;3%sm' % stdout_color)
 130         sys.stderr = ColoredFile(sys.stderr, '\033[31m')  # red
 131
 132         def myinput(prompt=None):
 133             save_stdout = sys.stdout
 134             sys.stdout = sys.__stdout__
 135             try:
 136                 result = builtin_input(prompt)
 137             except EOFError:
 138                 result = None
 139             sys.stdout = save_stdout
 140             return result
 141
 142         try:
 143             builtins.raw_input
 144         except AttributeError:  # PY3
 145             builtin_input = builtins.input
 146             builtins.input = myinput
 147         else:
 148             builtin_input = builtins.raw_input
 149             builtins.raw_input = myinput
 150
 151     try:
 152         import locale
 153     except ImportError:
 154         pass  # locale was not compiled
 155     else:
 156         try:
 157             locale.setlocale(locale.LC_ALL, '')
 158         except (ImportError, locale.Error):
 159             pass  # no locale support or unsupported locale
 160
 161     # set displayhook and excepthook
 162
 163     from pprint import pprint
 164     from traceback import format_exception, print_exc
 165
 166     pager = os.environ.get("PAGER") or 'more'
 167
 168     # if your pager is 'less', options '-F' and '-R' must be passed to it,
 169     # and option '-X' is very much recommended
 170     if pager == 'less':
 171         less = os.environ.get("LESS") or ''
 172         for opt in 'X', 'R', 'F':
 173             if opt not in less:
 174                 less = opt + less
 175         os.environ["LESS"] = less
 176
 177     class BasePager:
 178         def write(self, value):
 179             self.stdout.write(value)
 180
 181         if _term_found:
 182             def pprint(self, value):
 183                 pprint(value,
 184                        stream=ColoredFile(self.stdout,
 185                                           '\033[1;3%sm' % stdout_color))
 186
 187         def close(self):
 188             self.stdout.close()
 189
 190     try:
 191         from subprocess import Popen, PIPE
 192     except ImportError:
 193         class Pager(BasePager):
 194             def __init__(self):
 195                 self.stdout = os.popen(pager, 'w')
 196     else:
 197         class Pager(BasePager):
 198             def __init__(self):
 199                 self.pipe = Popen(pager, shell=True, stdin=PIPE,
 200                                   universal_newlines=True)
 201                 self.stdout = self.pipe.stdin
 202
 203             def close(self):
 204                 BasePager.close(self)
 205                 self.pipe.wait()
 206
 207     def displayhook(value):
 208         if value is not None:
 209             builtins._ = value
 210         pager = Pager()
 211         try:
 212             pager.pprint(value)
 213         except:  # noqa
 214             if _term_found:
 215                 pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 216             print_exc(file=pager)
 217         pager.close()
 218
 219     sys.displayhook = displayhook
 220
 221     def excepthook(etype, evalue, etraceback):
 222         lines = format_exception(etype, evalue, etraceback)
 223         pager = Pager()
 224         if _term_found:
 225             pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 226         for line in lines:
 227             pager.write(line)
 228         pager.close()
 229
 230     sys.excepthook = excepthook
 231
 232     # try:
 233     #     import cgitb
 234     # except ImportError:
 235     #     pass
 236     # else:
 237     #     # cgitb.enable() overrides sys.excepthook
 238     #     cgitb.enable(format='text')
 239
 240     # From Thomas Heller:
 241     # https://mail.python.org/pipermail/python-list/2001-April/099020.html
 242
 243     # import pdb
 244     #
 245     # def info(*args):
 246     #    pdb.pm()
 247     # sys.excepthook = info
 248
 249     # utilities
 250
 251     # From: Paul Magwene:
 252     # https://mail.python.org/pipermail/python-list/2001-March/086191.html
 253     # With a lot of my fixes:
 254
 255     class DirLister:
 256         def __getitem__(self, key):
 257             s = os.listdir(os.curdir)
 258             return s[key]
 259
 260         def __getslice__(self, i, j):
 261             s = os.listdir(os.curdir)
 262             return s[i:j]
 263
 264         def __repr__(self):
 265             return str(os.listdir(os.curdir))
 266
 267         def __call__(self, path=None):
 268             if path:
 269                 path = os.path.expanduser(os.path.expandvars(path))
 270             else:
 271                 path = os.curdir
 272             return os.listdir(path)
 273
 274     class DirChanger:
 275         def __repr__(self):
 276             self()
 277             return os.getcwd()
 278
 279         def __call__(self, path=None):
 280             path = os.path.expanduser(os.path.expandvars(path or '~'))
 281             os.chdir(path)
 282
 283     builtins.ls = DirLister()
 284     builtins.cd = DirChanger()
 285
 286     # print working directory
 287
 288     class Pwd:
 289         def __repr__(self):
 290             return os.getcwd()
 291
 292         def __call__(self):
 293             return repr(self)
 294
 295     builtins.pwd = Pwd()
 296
 297     # exit REPL with 'exit', 'quit' or simple 'x'
 298
 299     class _Exit:
 300         def __repr__(self):
 301             sys.exit()
 302
 303         def __call__(self, msg=None):
 304             sys.exit(msg)
 305
 306     builtins.x = _Exit()
 307
 308     # print conten of a file
 309
 310     class _Cat:
 311         def __repr__(self):
 312             return "Usage: cat('filename')"
 313
 314         def __call__(self, filename):
 315             fp = open(filename, 'rU')
 316             text = fp.read()
 317             fp.close()
 318             print(text)
 319
 320     builtins.cat = _Cat()
 321
 322     # call shell
 323
 324     class _Sh:
 325         def __repr__(self):
 326             os.system(os.environ["SHELL"])
 327             return ''
 328
 329         def __call__(self, cmdline):
 330             os.system(cmdline)
 331
 332     builtins.sh = _Sh()
 333
 334     # paginate a file
 335
 336     class _Pager:
 337         def __repr__(self):
 338             return "Usage: pager('filename')"
 339
 340         def __call__(self, filename):
 341             os.system("%s '%s'" % (pager, filename.replace("'", '"\'"')))
 342
 343     builtins.pager = _Pager()
 344
 345     # edit a file
 346
 347     class _Editor:
 348         def __repr__(self):
 349             return "Usage: edit('filename')"
 350
 351         def __call__(self, filename):
 352             editor = os.environ.get("VISUAL") \
 353                 or os.environ.get("EDITOR") or 'vi'
 354             os.system("%s '%s'" % (editor, filename.replace("'", '"\'"')))
 355
 356     builtins.edit = builtins.editor = _Editor()
 357
 358
 359 init()
 360 del init