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     import __builtin__
  13     import os
  14     import sys
  15
  16     # readline/pyreadline
  17
  18     pyreadlinew32_startup = os.path.join(
  19         sys.prefix, 'lib', 'site-packages',
  20         'pyreadline', 'configuration', 'startup.py')
  21
  22     if os.path.exists(pyreadlinew32_startup):
  23         execfile(pyreadlinew32_startup)
  24
  25     else:
  26         # From Bruce Edge:
  27         # https://mail.python.org/pipermail/python-list/2001-March/062888.html
  28
  29         try:
  30             import rlcompleter  # noqa: need for completion
  31             import readline
  32             initfile = os.environ.get('INPUTRC') \
  33                 or os.path.expanduser('~/.inputrc')
  34             readline.read_init_file(initfile)
  35
  36             histfile = os.path.expanduser('~/.python-history')
  37             try:
  38                 readline.read_history_file(histfile)
  39             except IOError:
  40                 pass  # No such file
  41
  42             def savehist():
  43                 histfilesize = os.environ.get('HISTFILESIZE') \
  44                     or os.environ.get('HISTSIZE')
  45                 if histfilesize:
  46                     try:
  47                         histfilesize = int(histfilesize)
  48                     except ValueError:
  49                         pass
  50                     else:
  51                         readline.set_history_length(histfilesize)
  52                 readline.write_history_file(histfile)
  53
  54             import atexit
  55             atexit.register(savehist)
  56
  57         except (ImportError, AttributeError):
  58             # no readline or atexit, or readline doesn't have
  59             # {read,write}_history_file - ignore the error
  60             pass
  61
  62     # terminal
  63
  64     term = os.environ.get('TERM', '')
  65     if 'linux' in term:
  66         background = 'dark'
  67     else:
  68         background = os.environ.get('BACKGROUND', 'light').lower()
  69
  70     # From Randall Hopper:
  71     # https://mail.python.org/pipermail/python-list/2001-March/112696.html
  72
  73     for _term in ['linux', 'rxvt', 'screen', 'term', 'vt100']:
  74         if _term not in term:
  75             continue
  76
  77         if background == 'dark':
  78             ps1_color = '3'  # yellow
  79             stdout_color = '7'  # bold white
  80         else:
  81             ps1_color = '4'  # blue
  82             stdout_color = '0'  # bold black
  83
  84         sys.ps1 = '\001\033[3%sm\002>>>\001\033[0m\002 ' % ps1_color
  85         sys.ps2 = '\001\033[1;32m\002...\001\033[0m\002 '  # bold green
  86
  87         # From Denis Otkidach
  88
  89         class ColoredFile:
  90             def __init__(self, fp, begin,
  91                          end='\033[0m'):  # reset all attributes
  92                 self.__fp = fp
  93                 self.__begin = begin
  94                 self.__end = end
  95
  96             def write(self, s):
  97                 self.__fp.write(self.__begin+s+self.__end)
  98
  99             def writelines(self, lines):
 100                 map(self.write, lines)
 101
 102             def __getattr__(self, attr):
 103                 return getattr(self.__fp, attr)
 104
 105         sys.stdout = ColoredFile(sys.stdout, '\033[1;3%sm' % stdout_color)
 106         sys.stderr = ColoredFile(sys.stderr, '\033[31m')  # red
 107
 108         break
 109
 110     try:
 111         import locale
 112     except ImportError:
 113         pass  # locale was not compiled
 114     else:
 115         try:
 116             locale.setlocale(locale.LC_ALL, '')
 117
 118         except (ImportError, locale.Error):
 119             pass  # no locale support or unsupported locale
 120
 121     # set displayhook
 122
 123     from pprint import pprint
 124
 125     class BasePPrintPager:
 126         def pipe(self, value):
 127             pprint(value, stream=self.stdin)
 128
 129         def close(self):
 130             self.stdin.close()
 131
 132     try:
 133         from subprocess import Popen, PIPE
 134     except ImportError:
 135         class PPrintPager(BasePPrintPager):
 136             def __init__(self):
 137                 self.pipe = Popen(pager, shell=True, stdin=PIPE)
 138                 self.stdin = self.pipe.stdin
 139
 140             def close(self):
 141                 BasePPrintPager.close(self)
 142                 self.pipe.wait()
 143     else:
 144         class PPrintPager(BasePPrintPager):
 145             def __init__(self):
 146                 self.stdin = os.popen(pager, 'w')
 147     pager = os.environ.get("PAGER") or 'more'
 148
 149     def displayhook(value):
 150         if value is not None:
 151             __builtin__._ = value
 152         pprint_pager = PPrintPager()
 153         pprint_pager.pipe(value)
 154         pprint_pager.close()
 155
 156     sys.displayhook = displayhook
 157
 158     from traceback import print_exception
 159
 160     def excepthook(etype, evalue, etraceback):
 161         print_exception(etype, evalue, etraceback)
 162
 163     sys.excepthook = excepthook
 164
 165     # From Thomas Heller:
 166     # https://mail.python.org/pipermail/python-list/2001-April/099020.html
 167
 168     # import pdb
 169     #
 170     # def info(*args):
 171     #    pdb.pm()
 172     # sys.excepthook = info
 173
 174     # utilities
 175
 176     # From: Paul Magwene:
 177     # https://mail.python.org/pipermail/python-list/2001-March/086191.html
 178     # With a lot of my fixes:
 179
 180     class DirLister:
 181         def __getitem__(self, key):
 182             s = os.listdir(os.curdir)
 183             return s[key]
 184
 185         def __getslice__(self, i, j):
 186             s = os.listdir(os.curdir)
 187             return s[i:j]
 188
 189         def __repr__(self):
 190             return str(os.listdir(os.curdir))
 191
 192         def __call__(self, path=None):
 193             if path:
 194                 path = os.path.expanduser(os.path.expandvars(path))
 195             else:
 196                 path = os.curdir
 197             return os.listdir(path)
 198
 199     class DirChanger:
 200         def __repr__(self):
 201             self()
 202             return os.getcwd()
 203
 204         def __call__(self, path=None):
 205             path = os.path.expanduser(os.path.expandvars(path or '~'))
 206             os.chdir(path)
 207
 208     __builtin__.ls = DirLister()
 209     __builtin__.cd = DirChanger()
 210
 211     # print working directory
 212
 213     class Pwd:
 214         def __repr__(self):
 215             return os.getcwd()
 216
 217         def __call__(self):
 218             return repr(self)
 219
 220     __builtin__.pwd = Pwd()
 221
 222     # exit REPL with 'exit', 'quit' or simple 'x'
 223
 224     class _Exit:
 225         def __repr__(self):
 226             sys.exit()
 227
 228         def __call__(self, msg=None):
 229             sys.exit(msg)
 230
 231     __builtin__.x = _Exit()
 232
 233     # In Python 2.5+ exit and quit are objects
 234     if isinstance(__builtin__.exit, str):
 235         __builtin__.exit = __builtin__.quit = x  # noqa: x is defined as _Exit
 236
 237     # print conten of a file
 238
 239     class _Cat:
 240         def __repr__(self):
 241             return "Usage: cat('filename')"
 242
 243         def __call__(self, filename):
 244             fp = open(filename, 'rU')
 245             text = fp.read()
 246             fp.close()
 247             print text
 248
 249     __builtin__.cat = _Cat()
 250
 251     # call shell
 252
 253     class _Sh:
 254         def __repr__(self):
 255             os.system(os.environ["SHELL"])
 256             return ''
 257
 258         def __call__(self, cmdline):
 259             os.system(cmdline)
 260
 261     __builtin__.sh = _Sh()
 262
 263     # paginate a file
 264
 265     class _Pager:
 266         def __repr__(self):
 267             return "Usage: pager('filename')"
 268
 269         def __call__(self, filename):
 270             os.system("%s '%s'" % (pager, filename.replace("'", '"\'"')))
 271
 272     __builtin__.pager = _Pager()
 273
 274     # edit a file
 275
 276     class _Editor:
 277         def __repr__(self):
 278             return "Usage: edit('filename')"
 279
 280         def __call__(self, filename):
 281             editor = os.environ.get("VISUAL") \
 282                 or os.environ.get("EDITOR") or 'vi'
 283             os.system("%s '%s'" % (editor, filename.replace("'", '"\'"')))
 284
 285     __builtin__.edit = __builtin__.editor = _Editor()
 286
 287
 288 init()
 289 del init