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