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'''Keycmd completion.'''
import re
# Completion level
NONE, ONCE, LIST, COMPLETE = range(4)
# The reverse keyword finding re.
FIND_SEGMENT = re.compile("(\@[\w_]+|set[\s]+[\w_]+|[\w_]+)$").findall
# Formats
LIST_FORMAT = "<span> %s </span>"
ITEM_FORMAT = "<span @hint_style>%s</span>%s"
def escape(str):
return str.replace("@", "\@")
def get_incomplete_keyword(uzbl):
'''Gets the segment of the keycmd leading up to the cursor position and
uses a regular expression to search backwards finding parially completed
keywords or @variables. Returns a null string if the correct completion
conditions aren't met.'''
keylet = uzbl.keylet
left_segment = keylet.keycmd[:keylet.cursor]
partial = (FIND_SEGMENT(left_segment) + ['',])[0].lstrip()
if partial.startswith('set '):
return ('@%s' % partial[4:].lstrip(), True)
return (partial, False)
def stop_completion(uzbl, *args):
'''Stop command completion and return the level to NONE.'''
uzbl.completion.level = NONE
del uzbl.config['completion_list']
def complete_completion(uzbl, partial, hint, set_completion=False):
'''Inject the remaining porition of the keyword into the keycmd then stop
the completioning.'''
if set_completion:
remainder = "%s = " % hint[len(partial):]
else:
remainder = "%s " % hint[len(partial):]
uzbl.inject_keycmd(remainder)
stop_completion(uzbl)
def partial_completion(uzbl, partial, hint):
'''Inject a common portion of the hints into the keycmd.'''
remainder = hint[len(partial):]
uzbl.inject_keycmd(remainder)
def update_completion_list(uzbl, *args):
'''Checks if the user still has a partially completed keyword under his
cursor then update the completion hints list.'''
partial = get_incomplete_keyword(uzbl)[0]
if not partial:
return stop_completion(uzbl)
if uzbl.completion.level < LIST:
return
hints = filter(lambda h: h.startswith(partial), uzbl.completion)
if not hints:
del uzbl.config['completion_list']
return
j = len(partial)
l = [ITEM_FORMAT % (escape(h[:j]), h[j:]) for h in sorted(hints)]
uzbl.config['completion_list'] = LIST_FORMAT % ' '.join(l)
def start_completion(uzbl, *args):
comp = uzbl.completion
if comp.locked:
return
(partial, set_completion) = get_incomplete_keyword(uzbl)
if not partial:
return stop_completion(uzbl)
if comp.level < COMPLETE:
comp.level += 1
hints = filter(lambda h: h.startswith(partial), comp)
if not hints:
return
elif len(hints) == 1:
comp.lock()
complete_completion(uzbl, partial, hints[0], set_completion)
comp.unlock()
return
elif partial in hints and comp.level == COMPLETE:
comp.lock()
complete_completion(uzbl, partial, partial, set_completion)
comp.unlock()
return
smalllen, smallest = sorted([(len(h), h) for h in hints])[0]
common = ''
for i in range(len(partial), smalllen):
char, same = smallest[i], True
for hint in hints:
if hint[i] != char:
same = False
break
if not same:
break
common += char
if common:
comp.lock()
partial_completion(uzbl, partial, partial+common)
comp.unlock()
update_completion_list(uzbl)
def add_builtins(uzbl, builtins):
'''Pump the space delimited list of builtin commands into the
builtin list.'''
uzbl.completion.update(builtins.split())
def add_config_key(uzbl, key, value):
'''Listen on the CONFIG_CHANGED event and add config keys to the variable
list for @var<Tab> like expansion support.'''
uzbl.completion.add("@%s" % key)
class Completions(set):
def __init__(self):
set.__init__(self)
self.locked = False
self.level = NONE
def lock(self):
self.locked = True
def unlock(self):
self.locked = False
def init(uzbl):
'''Export functions and connect handlers to events.'''
export_dict(uzbl, {
'completion': Completions(),
'start_completion': start_completion,
})
connect_dict(uzbl, {
'BUILTINS': add_builtins,
'CONFIG_CHANGED': add_config_key,
'KEYCMD_CLEARED': stop_completion,
'KEYCMD_EXEC': stop_completion,
'KEYCMD_UPDATE': update_completion_list,
'START_COMPLETION': start_completion,
'STOP_COMPLETION': stop_completion,
})
uzbl.send('dump_config_as_events')
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