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'''Plugin provides arbitrarily binding uzbl events to uzbl commands.
You can use $1,$2 to refer to the arguments appearing in the relevant event messages
For example:
request ON_EVENT LINK_HOVER 'set SELECTED_URI = $1'
this will set the SELECTED_URI variable which you can display in your statusbar
'''
import sys
import re
from event_manager import config
__export__ = ['get_on_events', 'on_event']
UZBLS = {}
def echo(msg):
if config['verbose']:
print 'on_event plugin:', msg
def error(msg):
sys.stderr.write('on_event plugin: error: %s\n' % msg)
def add_instance(uzbl, *args):
UZBLS[uzbl] = {}
def del_instance(uzbl, *args):
if uzbl in UZBLS:
del UZBLS[uzbl]
def get_on_events(uzbl):
if uzbl not in UZBLS:
add_instance(uzbl)
return UZBLS[uzbl]
def expand(cmd, args):
'''Replaces "%s %s %s.." with "arg1 arg2 arg3..".
This could be improved by specifing explicitly which argument to substitue
for what by parsing "$@ $0 $1 $2 $3.." found in the command string.'''
if '%s' not in cmd or not len(args):
return cmd
if len(args) > 1:
for arg in args:
cmd = cmd.replace('%s', str(arg), 1)
else:
cmd = cmd.replace('%s', str(args[0]))
return cmd
def event_handler(uzbl, *args, **kargs):
'''This function handles all the events being watched by various
on_event definitions and responds accordingly.'''
events = get_on_events(uzbl)
event = kargs['on_event']
if event not in events:
return
commands = events[event]
for cmd in commands:
cmd = expand(cmd, args)
uzbl.send(cmd)
def on_event(uzbl, event, cmd):
'''Add a new event to watch and respond to.'''
events = get_on_events(uzbl)
if event not in events:
uzbl.connect(event, event_handler, on_event=event)
events[event] = []
cmds = events[event]
if cmd not in cmds:
cmds.append(cmd)
def parse_on_event(uzbl, args):
'''Parse ON_EVENT events and pass them to the on_event function.
Syntax: "event ON_EVENT <EVENT_NAME> commands"
'''
split = args.split(' ', 1)
if len(split) != 2:
return error("invalid ON_EVENT syntax: %r" % args)
event, cmd = split
on_event(uzbl, event, cmd)
def init(uzbl):
connects = {'ON_EVENT': parse_on_event,
'INSTANCE_START': add_instance,
'INSTANCE_EXIT': del_instance}
for (event, handler) in connects.items():
uzbl.connect(event, handler)
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