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