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     if 'linux' in term:
  84         background = 'dark'
  85     else:
  86         background = os.environ.get('BACKGROUND', 'light').lower()
  87
  88     # From Randall Hopper:
  89     # https://mail.python.org/pipermail/python-list/2001-March/112696.html
  90
  91     _term_found = False
  92     for _term in ['linux', 'rxvt', 'screen', 'term', 'vt100']:
  93         if _term in term:
  94             _term_found = True
  95             break
  96
  97     if _term_found:
  98         if background == 'dark':
  99             ps1_color = '3'  # yellow
 100             stdout_color = '7'  # bold white
 101         else:
 102             ps1_color = '4'  # blue
 103             stdout_color = '0'  # bold black
 104
 105         sys.ps1 = '\001\033[3%sm\002>>>\001\033[0m\002 ' % ps1_color
 106         sys.ps2 = '\001\033[1;32m\002...\001\033[0m\002 '  # bold green
 107
 108         # From Denis Otkidach
 109
 110         class ColoredFile:
 111             def __init__(self, fp, begin,
 112                          end='\033[0m'):  # reset all attributes
 113                 self.__fp = fp
 114                 self.__begin = begin
 115                 self.__end = end
 116
 117             def write(self, s):
 118                 self.__fp.write(self.__begin+s+self.__end)
 119
 120             def writelines(self, lines):
 121                 map(self.write, lines)
 122
 123             def __getattr__(self, attr):
 124                 return getattr(self.__fp, attr)
 125
 126         sys.stdout = ColoredFile(sys.stdout, '\033[1;3%sm' % stdout_color)
 127         sys.stderr = ColoredFile(sys.stderr, '\033[31m')  # red
 128
 129         def myinput(prompt=None):
 130             save_stdout = sys.stdout
 131             sys.stdout = sys.__stdout__
 132             try:
 133                 result = builtin_input(prompt)
 134             except EOFError:
 135                 result = None
 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         def pprint(self, value):
 179             pprint(value,
 180                    stream=ColoredFile(self.stdout,
 181                                       '\033[1;3%sm' % stdout_color))
 182
 183         def close(self):
 184             self.stdout.close()
 185
 186     try:
 187         from subprocess import Popen, PIPE
 188     except ImportError:
 189         class Pager(BasePager):
 190             def __init__(self):
 191                 self.stdout = os.popen(pager, 'w')
 192     else:
 193         class Pager(BasePager):
 194             def __init__(self):
 195                 self.pipe = Popen(pager, shell=True, stdin=PIPE,
 196                                   universal_newlines=True)
 197                 self.stdout = self.pipe.stdin
 198
 199             def close(self):
 200                 BasePager.close(self)
 201                 self.pipe.wait()
 202
 203     def displayhook(value):
 204         if value is not None:
 205             builtins._ = value
 206         pager = Pager()
 207         try:
 208             pager.pprint(value)
 209         except:  # noqa
 210             pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 211             print_exc(file=pager)
 212         pager.close()
 213
 214     sys.displayhook = displayhook
 215
 216     def excepthook(etype, evalue, etraceback):
 217         lines = format_exception(etype, evalue, etraceback)
 218         pager = Pager()
 219         pager.stdout = ColoredFile(pager.stdout, '\033[31m')  # red
 220         for line in lines:
 221             pager.write(line)
 222         pager.close()
 223
 224     sys.excepthook = excepthook
 225
 226     # try:
 227     #     import cgitb
 228     # except ImportError:
 229     #     pass
 230     # else:
 231     #     # cgitb.enable() overrides sys.excepthook
 232     #     cgitb.enable(format='text')
 233
 234     # From Thomas Heller:
 235     # https://mail.python.org/pipermail/python-list/2001-April/099020.html
 236
 237     # import pdb
 238     #
 239     # def info(*args):
 240     #    pdb.pm()
 241     # sys.excepthook = info
 242
 243     # utilities
 244
 245     # From: Paul Magwene:
 246     # https://mail.python.org/pipermail/python-list/2001-March/086191.html
 247     # With a lot of my fixes:
 248
 249     class DirLister:
 250         def __getitem__(self, key):
 251             s = os.listdir(os.curdir)
 252             return s[key]
 253
 254         def __getslice__(self, i, j):
 255             s = os.listdir(os.curdir)
 256             return s[i:j]
 257
 258         def __repr__(self):
 259             return str(os.listdir(os.curdir))
 260
 261         def __call__(self, path=None):
 262             if path:
 263                 path = os.path.expanduser(os.path.expandvars(path))
 264             else:
 265                 path = os.curdir
 266             return os.listdir(path)
 267
 268     class DirChanger:
 269         def __repr__(self):
 270             self()
 271             return os.getcwd()
 272
 273         def __call__(self, path=None):
 274             path = os.path.expanduser(os.path.expandvars(path or '~'))
 275             os.chdir(path)
 276
 277     builtins.ls = DirLister()
 278     builtins.cd = DirChanger()
 279
 280     # print working directory
 281
 282     class Pwd:
 283         def __repr__(self):
 284             return os.getcwd()
 285
 286         def __call__(self):
 287             return repr(self)
 288
 289     builtins.pwd = Pwd()
 290
 291     # exit REPL with 'exit', 'quit' or simple 'x'
 292
 293     class _Exit:
 294         def __repr__(self):
 295             sys.exit()
 296
 297         def __call__(self, msg=None):
 298             sys.exit(msg)
 299
 300     builtins.x = _Exit()
 301
 302     # print conten of a file
 303
 304     class _Cat:
 305         def __repr__(self):
 306             return "Usage: cat('filename')"
 307
 308         def __call__(self, filename):
 309             fp = open(filename, 'rU')
 310             text = fp.read()
 311             fp.close()
 312             print(text)
 313
 314     builtins.cat = _Cat()
 315
 316     # call shell
 317
 318     class _Sh:
 319         def __repr__(self):
 320             os.system(os.environ["SHELL"])
 321             return ''
 322
 323         def __call__(self, cmdline):
 324             os.system(cmdline)
 325
 326     builtins.sh = _Sh()
 327
 328     # paginate a file
 329
 330     class _Pager:
 331         def __repr__(self):
 332             return "Usage: pager('filename')"
 333
 334         def __call__(self, filename):
 335             os.system("%s '%s'" % (pager, filename.replace("'", '"\'"')))
 336
 337     builtins.pager = _Pager()
 338
 339     # edit a file
 340
 341     class _Editor:
 342         def __repr__(self):
 343             return "Usage: edit('filename')"
 344
 345         def __call__(self, filename):
 346             editor = os.environ.get("VISUAL") \
 347                 or os.environ.get("EDITOR") or 'vi'
 348             os.system("%s '%s'" % (editor, filename.replace("'", '"\'"')))
 349
 350     builtins.edit = builtins.editor = _Editor()
 351
 352
 353 init()
 354 del init