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             result = builtin_input(prompt)
 136             sys.stdout = save_stdout
 137             return result
 138
 139         try:
 140             builtins.raw_input
 141         except AttributeError:  # PY3
 142             builtin_input = builtins.input
 143             builtins.input = myinput
 144         else:
 145             builtin_input = builtins.raw_input
 146             builtins.raw_input = myinput
 147
 148     try:
 149         import locale
 150     except ImportError:
 151         pass  # locale was not compiled
 152     else:
 153         try:
 154             locale.setlocale(locale.LC_ALL, '')
 155         except (ImportError, locale.Error):
 156             pass  # no locale support or unsupported locale
 157
 158     # set displayhook and excepthook
 159
 160     from pprint import pprint
 161     from traceback import format_exception, print_exc
 162
 163     pager = os.environ.get("PAGER") or 'more'
 164
 165     # if your pager is 'less', options '-F' and '-R' must be passed to it,
 166     # and option '-X' is very much recommended
 167     if pager == 'less':
 168         less = os.environ.get("LESS") or ''
 169         for opt in 'X', 'R', 'F':
 170             if opt not in less:
 171                 less = opt + less
 172         os.environ["LESS"] = less
 173
 174     class BasePager:
 175         def write(self, value):
 176             self.stdout.write(value)
 177
 178         if _term_found:
 179             def pprint(self, value):
 180                 pprint(value,
 181                        stream=ColoredFile(self.stdout,
 182                                           '\033[1;3%sm' % stdout_color))
 183
 184         def close(self):
 185             self.stdout.close()
 186
 187     try:
 188         from subprocess import Popen, PIPE
 189     except ImportError:
 190         class Pager(BasePager):
 191             def __init__(self):
 192                 self.stdout = os.popen(pager, 'w')
 193     else:
 194         class Pager(BasePager):
 195             def __init__(self):
 196                 self.pipe = Popen(pager, shell=True, stdin=PIPE,
 197                                   universal_newlines=True)
 198                 self.stdout = self.pipe.stdin
 199
 200             def close(self):
 201                 BasePager.close(self)
 202                 self.pipe.wait()
 203
 204     def displayhook(value):
 205         if value is not None:
 206             builtins._ = value
 207         pager = Pager()
 208         try:
 209             pager.pprint(value)
 210         except:  # noqa
 211             if _term_found:
 212                 pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 213             print_exc(file=pager)
 214         pager.close()
 215
 216     sys.displayhook = displayhook
 217
 218     def excepthook(etype, evalue, etraceback):
 219         lines = format_exception(etype, evalue, etraceback)
 220         pager = Pager()
 221         if _term_found:
 222             pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 223         for line in lines:
 224             pager.write(line)
 225         pager.close()
 226
 227     sys.excepthook = excepthook
 228
 229     # try:
 230     #     import cgitb
 231     # except ImportError:
 232     #     pass
 233     # else:
 234     #     # cgitb.enable() overrides sys.excepthook
 235     #     cgitb.enable(format='text')
 236
 237     # From Thomas Heller:
 238     # https://mail.python.org/pipermail/python-list/2001-April/099020.html
 239
 240     # import pdb
 241     #
 242     # def info(*args):
 243     #    pdb.pm()
 244     # sys.excepthook = info
 245
 246     # utilities
 247
 248     # From: Paul Magwene:
 249     # https://mail.python.org/pipermail/python-list/2001-March/086191.html
 250     # With a lot of my fixes:
 251
 252     class DirLister:
 253         def __getitem__(self, key):
 254             s = os.listdir(os.curdir)
 255             return s[key]
 256
 257         def __getslice__(self, i, j):
 258             s = os.listdir(os.curdir)
 259             return s[i:j]
 260
 261         def __repr__(self):
 262             return str(os.listdir(os.curdir))
 263
 264         def __call__(self, path=None):
 265             if path:
 266                 path = os.path.expanduser(os.path.expandvars(path))
 267             else:
 268                 path = os.curdir
 269             return os.listdir(path)
 270
 271     class DirChanger:
 272         def __repr__(self):
 273             self()
 274             return os.getcwd()
 275
 276         def __call__(self, path=None):
 277             path = os.path.expanduser(os.path.expandvars(path or '~'))
 278             os.chdir(path)
 279
 280     builtins.ls = DirLister()
 281     builtins.cd = DirChanger()
 282
 283     # print working directory
 284
 285     class Pwd:
 286         def __repr__(self):
 287             return os.getcwd()
 288
 289         def __call__(self):
 290             return repr(self)
 291
 292     builtins.pwd = Pwd()
 293
 294     # exit REPL with 'exit', 'quit' or simple 'x'
 295
 296     class _Exit:
 297         def __repr__(self):
 298             sys.exit()
 299
 300         def __call__(self, msg=None):
 301             sys.exit(msg)
 302
 303     builtins.x = _Exit()
 304
 305     # print conten of a file
 306
 307     class _Cat:
 308         def __repr__(self):
 309             return "Usage: cat('filename')"
 310
 311         def __call__(self, filename):
 312             fp = open(filename, 'rU')
 313             text = fp.read()
 314             fp.close()
 315             print(text)
 316
 317     builtins.cat = _Cat()
 318
 319     # call shell
 320
 321     class _Sh:
 322         def __repr__(self):
 323             os.system(os.environ["SHELL"])
 324             return ''
 325
 326         def __call__(self, cmdline):
 327             os.system(cmdline)
 328
 329     builtins.sh = _Sh()
 330
 331     # paginate a file
 332
 333     class _Pager:
 334         def __repr__(self):
 335             return "Usage: pager('filename')"
 336
 337         def __call__(self, filename):
 338             os.system("%s '%s'" % (pager, filename.replace("'", '"\'"')))
 339
 340     builtins.pager = _Pager()
 341
 342     # edit a file
 343
 344     class _Editor:
 345         def __repr__(self):
 346             return "Usage: edit('filename')"
 347
 348         def __call__(self, filename):
 349             editor = os.environ.get("VISUAL") \
 350                 or os.environ.get("EDITOR") or 'vi'
 351             os.system("%s '%s'" % (editor, filename.replace("'", '"\'"')))
 352
 353     builtins.edit = builtins.editor = _Editor()
 354
 355
 356 init()
 357 del init