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