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