def __enter__(self):
# init curses and it's wrapper
self.screen = curses.initscr()
self.display = Display(self.screen, self.encoding)
# create keyhandler
self.keyhandler = key.KeyHandler(self.screen)
# create view
self.view = SelectorView(percol = self)
# create command
self.command_candidate = SelectorCommand(self.model_candidate, self.view)
self.command_action = SelectorCommand(self.model_action, self.view)
# suppress SIGINT termination
signal.signal(signal.SIGINT, lambda signum, frame: None)
# handle special keys like <f1>, <down>, ...
self.screen.keypad(True)
curses.raw()
curses.noecho()
curses.cbreak()
# Leave newline mode. Make percol distinguish between "C-m" and "C-j".
curses.nonl()
return self
class Percol(object):
def __init__(self, descriptors = None, encoding = "utf-8",
finder = None, action_finder = None,
candidates = None, actions = None,
query = None, caret = None, index = None):
# initialization
self.global_lock = threading.Lock()
self.encoding = encoding
if descriptors is None:
self.stdin = sys.stdin
self.stdout = sys.stdout
self.stderr = sys.stderr
else:
self.stdin = descriptors["stdin"]
self.stdout = descriptors["stdout"]
self.stderr = descriptors["stderr"]
if finder is None:
finder = FinderMultiQueryString
if action_finder is None:
action_finder = FinderMultiQueryString
self.actions = actions
# wraps candidates (iterator)
from percol.lazyarray import LazyArray
self.candidates = LazyArray(candidates or [])
# create model
self.model_candidate = SelectorModel(percol = self,
collection = self.candidates,
finder = finder,
query = query, caret = caret, index = index)
self.model_action = SelectorModel(percol = self,
collection = [action.desc for action in actions],
finder = action_finder)
self.model = self.model_candidate
def has_no_candidate(self):
return not self.candidates.has_nth_value(0)
def has_only_one_candidate(self):
return self.candidates.has_nth_value(0) and not self.candidates.has_nth_value(1)
def __enter__(self):
# init curses and it's wrapper
self.screen = curses.initscr()
self.display = Display(self.screen, self.encoding)
# create keyhandler
self.keyhandler = key.KeyHandler(self.screen)
# create view
self.view = SelectorView(percol = self)
# create command
self.command_candidate = SelectorCommand(self.model_candidate, self.view)
self.command_action = SelectorCommand(self.model_action, self.view)
# suppress SIGINT termination
signal.signal(signal.SIGINT, lambda signum, frame: None)
# handle special keys like <f1>, <down>, ...
self.screen.keypad(True)
curses.raw()
curses.noecho()
curses.cbreak()
# Leave newline mode. Make percol distinguish between "C-m" and "C-j".
curses.nonl()
return self
def __exit__(self, exc_type, exc_value, traceback):
# Back to newline mode (TODO: is it needed?).
curses.nl()
curses.endwin()
self.execute_action()
args_for_action = None
def execute_action(self):
selected_actions = self.model_action.get_selected_results_with_index()
if selected_actions and self.args_for_action:
for name, _, act_idx in selected_actions:
try:
action = self.actions[act_idx]
if action:
action.act([arg for arg, _, _ in self.args_for_action], self)
except Exception as e:
debug.log("execute_action", e)
# ============================================================ #
# Statuses
# ============================================================ #
@property
def opposite_model(self):
"""
Returns opposite model for self.model
"""
if self.model is self.model_action:
return self.model_candidate
else:
return self.model_action
def switch_model(self):
self.model = self.opposite_model
@property
def command(self):
"""
Returns corresponding model wrapper which provides advanced commands
"""
if self.model is self.model_action:
return self.command_action
else:
return self.command_candidate
# ============================================================ #
# Main Loop
# ============================================================ #
SEARCH_DELAY = 0.05
def loop(self):
self.view.refresh_display()
self.result_updating_timer = None
def search_and_refresh_display():
self.model.do_search(self.model.query)
self.view.refresh_display()
while True:
try:
self.handle_key(self.screen.getch())
if self.model.should_search_again():
# search again
with self.global_lock:
# critical section
if not self.result_updating_timer is None:
# clear timer
self.result_updating_timer.cancel()
self.result_updating_timer = None
# with bounce
t = threading.Timer(self.SEARCH_DELAY, search_and_refresh_display)
self.result_updating_timer = t
t.start()
self.view.refresh_display()
except TerminateLoop as e:
return e.value
# ============================================================ #
# Key Handling
# ============================================================ #
keymap = {
"C-i" : lambda percol: percol.switch_model(),
# text
"C-h" : lambda percol: percol.command.delete_backward_char(),
"<backspace>" : lambda percol: percol.command.delete_backward_char(),
"C-w" : lambda percol: percol.command.delete_backward_word(),
"C-u" : lambda percol: percol.command.clear_query(),
"<dc>" : lambda percol: percol.command.delete_forward_char(),
# caret
"<left>" : lambda percol: percol.command.backward_char(),
"<right>" : lambda percol: percol.command.forward_char(),
# line
"<down>" : lambda percol: percol.command.select_next(),
"<up>" : lambda percol: percol.command.select_previous(),
# page
"<npage>" : lambda percol: percol.command.select_next_page(),
"<ppage>" : lambda percol: percol.command.select_previous_page(),
# top / bottom
"<home>" : lambda percol: percol.command.select_top(),
"<end>" : lambda percol: percol.command.select_bottom(),
# mark
"C-SPC" : lambda percol: percol.command.toggle_mark_and_next(),
# finish
"RET" : lambda percol: percol.finish(), # Is RET never sent?
"C-m" : lambda percol: percol.finish(),
"C-j" : lambda percol: percol.finish(),
"C-c" : lambda percol: percol.cancel()
}
def import_keymap(self, keymap, reset = False):
if reset:
self.keymap = {}
else:
self.keymap = dict(self.keymap)
for key, cmd in six.iteritems(keymap):
self.keymap[key] = cmd
# default
last_key = None
def handle_key(self, ch):
if ch == curses.KEY_RESIZE:
self.last_key = self.handle_resize(ch)
elif ch != -1 and self.keyhandler.is_utf8_multibyte_key(ch):
self.last_key = self.handle_utf8(ch)
else:
self.last_key = self.handle_normal_key(ch)
def handle_resize(self, ch):
self.display.update_screen_size()
# XXX: trash -1 (it seems that resize key sends -1)
self.keyhandler.get_key_for(self.screen.getch())
return key.SPECIAL_KEYS[ch]
def handle_utf8(self, ch):
ukey = self.keyhandler.get_utf8_key_for(ch)
self.model.insert_string(ukey)
return ukey.encode(self.encoding)
def handle_normal_key(self, ch):
k = self.keyhandler.get_key_for(ch)
if k in self.keymap:
self.keymap[k](self)
elif self.keyhandler.is_displayable_key(ch):
self.model.insert_char(ch)
return k
# ------------------------------------------------------------ #
# Finish / Cancel
# ------------------------------------------------------------ #
def finish(self):
# save selected candidates and use them later (in execute_action)
raise TerminateLoop(self.finish_with_exit_code()) # success
def cancel(self):
raise TerminateLoop(self.cancel_with_exit_code()) # failure
def finish_with_exit_code(self):
self.args_for_action = self.model_candidate.get_selected_results_with_index()
return 0
def cancel_with_exit_code(self):
return 1