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