add skeleton config system
This commit is contained in:
Chris Jones
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#!/usr/bin/python
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# TerminatorConfig - layered config classes
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# Copyright (C) 2006-2008 cmsj@tenshu.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 2 only.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""TerminatorConfig by Chris Jones <cmsj@tenshu.net>
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The config scheme works in layers, with defaults at the base,
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and a simple/flexible class which can be placed over the top
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in multiple layers. This was written for Terminator, but
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could be used generically. Its original use is to guarantee
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default values for any config item, while allowing them to be
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overridden by at least two other stores of configuration values.
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Those being gconf and a plain config file.
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In addition to the value, the default layer must also provide
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the datatype (str, int, float and bool are currently supported).
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values are found as attributes of the TerminatorConfig object.
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Trying to read a value that doesn't exist will raise an
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AttributeError. This is by design. If you want to look something
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up, set a default for it first."""
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# import standard python libs
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import os
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# import unix-lib
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import pwd
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# set this to true to enable debugging output
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debug = True
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def dbg (log = ""):
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if debug:
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print >> sys.stderr, log
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class TerminatorConfig:
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callback = None
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sources = []
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def __init__ (self, sources = []):
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for source in sources:
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if isinstance(source, TerminatorConfValuestore):
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self.sources.append (source)
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# We always add a default valuestore last so no valid config item ever goes unset
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source = TerminatorConfValuestoreDefault ()
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self.sources.append (source)
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def __getattr__ (self, keyname):
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dbg ("Config: Looking for: %s"%keyname)
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for source in self.sources:
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try:
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val = getattr (source, keyname)
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dbg ("Config: got: %s from a %s"%(val, source.type))
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return (val)
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except:
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dbg ("Config: no value found in %s."%source.type)
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pass
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dbg ("Config: Out of sources")
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raise (AttributeError)
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# FIXME: Figure out exactly what we're going to do here
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def set_reconfigure_callback (self, function):
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self.callback = function
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return (True)
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class TerminatorConfValuestore:
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type = "Base"
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values = {}
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# Our settings
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# FIXME: Is it acceptable to not explicitly store the type, but
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# instead infer it from defaults[key].__class__.__name__
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defaults = {
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'gt_dir' : [str, '/apps/gnome-terminal'],
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'profile_dir' : [str, '/apps/gnome-terminal/profiles'],
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'titlebars' : [bool, True],
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'titletips' : [bool, False],
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'allow_bold' : [bool, False],
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'silent_bell' : [bool, True],
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'background_color' : [str, '#000000'],
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'background_darkness' : [float, 0.5],
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'background_type' : [str, 'solid'],
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'backspace_binding' : [str, 'ascii-del'],
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'delete_binding' : [str, 'delete-sequence'],
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'cursor_blink' : [bool, False],
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'emulation' : [str, 'xterm'],
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'font' : [str, 'Serif 10'],
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'foreground_color' : [str, '#AAAAAA'],
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'scrollbar_position' : [str, "right"],
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'scroll_background' : [bool, True],
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'scroll_on_keystroke' : [bool, False],
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'scroll_on_output' : [bool, False],
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'scrollback_lines' : [int, 100],
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'focus' : [str, 'sloppy'],
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'exit_action' : [str, 'close'],
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'palette' : [str, '#000000000000:#CDCD00000000:#0000CDCD0000:#CDCDCDCD0000:#30BF30BFA38E:#A53C212FA53C:#0000CDCDCDCD:#FAFAEBEBD7D7:#404040404040:#FFFF00000000:#0000FFFF0000:#FFFFFFFF0000:#00000000FFFF:#FFFF0000FFFF:#0000FFFFFFFF:#FFFFFFFFFFFF'],
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'word_chars' : [str, '-A-Za-z0-9,./?%&#:_'],
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'mouse_autohide' : [bool, True],
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}
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def __getattr__ (self, keyname):
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if self.values.has_key (keyname):
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return self.values[keyname][1]
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else:
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raise (AttributeError)
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class TerminatorConfValuestoreDefault (TerminatorConfValuestore):
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def __init__ (self):
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self.type = "Default"
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self.values = self.defaults
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class TerminatorConfValuestoreRC (TerminatorConfValuestore):
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rcfilename = ""
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#FIXME: use inotify to watch the rc, split __init__ into a parsing function
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# that can be re-used when rc changes.
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def __init__ (self):
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self.type = "RCFile"
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self.rcfilename = pwd.getpwuid (os.getuid ())[5] + "/.terminatorrc"
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if os.path.exists (self.rcfilename):
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rcfile = open (self.rcfilename)
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rc = rcfile.readlines ()
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rcfile.close ()
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for item in rc:
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try:
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item = item.strip ()
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if item and item[0] != '#':
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(key, value) = item.split ("=")
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dbg ("VS_RCFile: Setting value %s to %s"%(key, value))
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self.values[key] = [self.defaults[key][0], self.defaults[key][0](value)]
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except:
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pass
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class TerminatorConfValuestoreGConf (TerminatorConfValuestore):
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profile = ""
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client = None
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def __init__ (self, profile = None):
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self.type = "GConf"
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self.client = gconf.client_get_default ()
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# Grab a couple of values from base class to avoid recursing with our __getattr__
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self._gt_dir = self.defaults['gt_dir'][1]
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self._profile_dir = self.defaults['profile_dir'][1]
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if profile:
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self.profile = profile
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else:
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self.profile = self.client.get_string (self._gt_dir + '/global/default_profile')
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def __getattr__ (self, key):
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ret = None
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value = self.client.get ('%s/%s/%s'%(self._profile_dir, self.profile, key))
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if value:
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funcname = "get_" + self.defaults[key][0].__name__
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# Special case for str
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if funcname == "get_str":
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funcname = "get_string"
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typefunc = getattr (value, funcname)
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ret = typefunc ()
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return (ret)
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else:
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raise (AttributeError)
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if __name__ == '__main__':
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stores = []
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stores.append (TerminatorConfValuestoreRC ())
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try:
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import gconf
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stores.append (TerminatorConfValuestoreGConf ())
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except:
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pass
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foo = TerminatorConfig (stores)
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## cmsj: this is my testing ground
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## ensure that font is set in the Default gconf profile
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## set titlebars in the RC file
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## remove titletips from gconf/RC
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## do not define blimnle in any way
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# This should come from gconf (it's set by gnome-terminal)
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print foo.font
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# This should come from RC
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print foo.titlebars
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# This should come from defaults
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print foo.titletips
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# This should raise AttributeError
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print foo.blimnle
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