monitor/extra/Gnuplot/gp_cygwin.py

   1 # $Id: gp_cygwin.py 292 2006-03-03 09:49:04Z mhagger $
   2
   3 # Copyright (C) 1999-2003 Michael Haggerty <mhagger@alum.mit.edu>
   4 #
   5 # This file is licensed under the GNU Lesser General Public License
   6 # (LGPL).  See LICENSE.txt for details.
   7
   8 """gp_cygwin -- an interface to gnuplot for cygwin under Windows.
   9
  10 This is identical to gp_win32.py except that prefer_inline_data is
  11 set.
  12
  13 """
  14
  15 import Errors
  16
  17 # ############ Configuration variables: ################################
  18
  19 class GnuplotOpts:
  20     """The configuration options for gnuplot under windows.
  21
  22     See gp_unix.py for details about the meaning of these options.
  23     Please let me know if you know better choices for these settings.
  24
  25     """
  26
  27     # Command to start up the gnuplot program.  Note that on windows
  28     # the main gnuplot program cannot be used directly because it can
  29     # not read commands from standard input.  See README for more
  30     # information.
  31     #
  32     # If pgnuplot is in a subdirectory with spaces in its name, extra
  33     # quoting is required for windows for it to launch gnuplot.
  34     # Moreover, any backslashes in the filename have to be escaped by
  35     # writing them as "\\".  Example:
  36     #
  37     #     gnuplot_command = '"C:\\Program Files\\gp371w32\\pgnuplot.exe"'
  38     gnuplot_command = 'pgnuplot.exe'
  39
  40     # The '-persist' option is not supported on windows:
  41     recognizes_persist = 0
  42
  43     # As far as I know, gnuplot under windows can use binary data:
  44     recognizes_binary_splot = 1
  45
  46     # Apparently gnuplot on windows can use inline data, but we use
  47     # non-inline data (i.e., temporary files) by default for no
  48     # special reason:
  49     prefer_inline_data = 1
  50
  51     # os.mkfifo is apparently not supported under Windows.
  52     support_fifo = 0
  53     prefer_fifo_data = 0
  54
  55     # The default choice for the 'set term' command (to display on
  56     # screen):
  57     default_term = 'windows'
  58
  59     # According to the gnuplot help manual, the following can be used
  60     # to print directly to a printer under windows.  (Of course it
  61     # won't help if your printer can't handle postscript!)
  62     default_lpr = 'PRN'
  63
  64     # Used the 'enhanced' option of postscript by default?  Set to
  65     # None (*not* 0!) if your version of gnuplot doesn't support
  66     # enhanced postscript.
  67     prefer_enhanced_postscript = 1
  68
  69 # ############ End of configuration options ############################
  70
  71
  72 try:
  73     from sys import hexversion
  74 except ImportError:
  75     hexversion = 0
  76
  77 if hexversion >= 0x02000000:
  78     # Apparently at least as of Python 2.0b1, popen support for
  79     # windows is adequate.  Give that a try:
  80     from os import popen
  81 else:
  82     # For earlier versions, you have to have the win32 extensions
  83     # installed and we use the popen that it provides.
  84     from win32pipe import popen
  85
  86
  87 # Mac doesn't recognize persist.
  88 def test_persist():
  89     return 0
  90
  91
  92 class GnuplotProcess:
  93     """Unsophisticated interface to a running gnuplot program.
  94
  95     See gp_unix.py for usage information.
  96
  97     """
  98
  99     def __init__(self, persist=0):
 100         """Start a gnuplot process.
 101
 102         Create a 'GnuplotProcess' object.  This starts a gnuplot
 103         program and prepares to write commands to it.
 104
 105         Keyword arguments:
 106
 107             'persist' -- the '-persist' option is not supported under
 108                 Windows so this argument must be zero.
 109
 110         """
 111
 112         if persist:
 113             raise Errors.OptionError(
 114                 '-persist is not supported under Windows!')
 115
 116         self.gnuplot = popen(GnuplotOpts.gnuplot_command, 'w')
 117
 118         # forward write and flush methods:
 119         self.write = self.gnuplot.write
 120         self.flush = self.gnuplot.flush
 121
 122     def close(self):
 123         if self.gnuplot is not None:
 124             self.gnuplot.close()
 125             self.gnuplot = None
 126
 127     def __del__(self):
 128         self.close()
 129
 130     def __call__(self, s):
 131         """Send a command string to gnuplot, followed by newline."""
 132
 133         self.write(s + '\n')
 134         self.flush()
 135
 136