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thomasballingerthomasballinger
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add scroll frontend
--HG-- branch : scroll-frontend extra : rebase_source : 455c110865f3559e66917824ffbcf77660404c97
1 parent b1b3fbb commit f409901

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‎bpython/scroll.py‎

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from fmtstr.terminal import Terminal
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from fmtstr.terminalcontrol import TerminalController
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from bpython.scrollfrontend.repl import Repl
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def main():
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with TerminalController() as tc:
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with Terminal(tc) as term:
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with Repl() as repl:
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rows, columns = tc.get_screen_size()
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repl.width = columns
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repl.height = rows
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while True:
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try:
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repl.process_event(tc.get_event())
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except SystemExit:
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array, cursor_pos = repl.paint(about_to_exit=True)
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term.render_to_terminal(array, cursor_pos)
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raise
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else:
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array, cursor_pos = repl.paint()
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scrolled = term.render_to_terminal(array, cursor_pos)
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repl.scroll_offset += scrolled
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if __name__ == '__main__':
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main()

‎bpython/scrollfrontend/__init__.py‎

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‎bpython/scrollfrontend/abbreviate.py‎

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ABBR = {
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'improt' : 'import',
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'imprt' : 'import',
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'impotr' : 'import',
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'form' : 'from',
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}
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import re
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def substitute_abbreviations(cursor_offset, line):
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"""This should be much better"""
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new_line = ''.join([ABBR.get(word, word) for word in re.split(r'(\w+)', line)])
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cursor_offset = cursor_offset + len(new_line) - len(line)
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return cursor_offset, new_line
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if __name__ == '__main__':
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print(substitute_abbreviations(0, 'improt asdf'))
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print(substitute_abbreviations(0, 'foo(x, y() - 2.3242) + "asdf"'))

‎bpython/scrollfrontend/friendly.py‎

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class NotImplementedError(NotImplementedError):
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def __init__(self, msg=None):
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if msg is None:
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super(NotImplementedError, self).__init__("Implement it and submit a pull request!")
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else:
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super(NotImplementedError, self).__init__(msg)

‎bpython/scrollfrontend/interaction.py‎

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import Queue
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import time
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from bpython.repl import Interaction as BpythonInteraction
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from bpython.scrollfrontend.manual_readline import char_sequences as rl_char_sequences
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class StatusBar(BpythonInteraction):
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"""StatusBar and Interaction for Repl
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Passing of control back and forth between calls that use interact api
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(notify, confirm, file_prompt) like bpython.Repl.write2file and events
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on the main thread happens via those calls and self.wait_for_request_or_notify.
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Calling one of these three is required for the main thread to regain control!
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This is probably a terrible idea, and better would be rewriting this
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functionality in a evented or callback style, but trying to integrate
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bpython.Repl code.
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"""
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#TODO Remove dependence on bpython.Repl, it's more complicated than it's worth!
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def __init__(self, initial_message='', permanent_text=""):
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self._current_line = ''
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self.cursor_offset_in_line = 0
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self.in_prompt = False
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self.in_confirm = False
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self.prompt = ''
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self._message = initial_message
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self.message_start_time = time.time()
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self.message_time = 3
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self.permanent_text = permanent_text
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self.response_queue = Queue.Queue(maxsize=1)
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self.request_or_notify_queue = Queue.Queue()
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@property
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def has_focus(self):
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return self.in_prompt or self.in_confirm
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def message(self, msg):
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self.message_start_time = time.time()
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self._message = msg
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def _check_for_expired_message(self):
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if self._message and time.time() > self.message_start_time + self.message_time:
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self._message = ''
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def process_event(self, e):
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"""Returns True if shutting down"""
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assert self.in_prompt or self.in_confirm
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if e in rl_char_sequences:
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self.cursor_offset_in_line, self._current_line = rl_char_sequences[e](self.cursor_offset_in_line, self._current_line)
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elif e == "":
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raise KeyboardInterrupt()
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elif e == "":
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raise SystemExit()
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elif self.in_prompt and e in ("\n", "\r"):
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self.response_queue.put(self._current_line)
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self.escape()
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elif self.in_confirm:
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if e in ('y', 'Y'):
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self.response_queue.put(True)
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else:
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self.response_queue.put(False)
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self.escape()
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elif e == "\x1b":
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self.response_queue.put(False)
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self.escape()
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else: # add normal character
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#TODO factor this out, same in both process_event methods
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self._current_line = (self._current_line[:self.cursor_offset_in_line] +
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e +
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self._current_line[self.cursor_offset_in_line:])
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self.cursor_offset_in_line += 1
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def escape(self):
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"""unfocus from statusbar, clear prompt state, wait for notify call"""
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self.wait_for_request_or_notify()
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self.in_prompt = False
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self.in_confirm = False
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self.prompt = ''
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self._current_line = ''
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@property
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def current_line(self):
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self._check_for_expired_message()
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if self.in_prompt:
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return self.prompt + self._current_line
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if self.in_confirm:
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return self.prompt
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if self._message:
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return self._message
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return self.permanent_text
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def wait_for_request_or_notify(self):
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try:
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r = self.request_or_notify_queue.get(True, 1)
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except Queue.Empty:
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raise Exception('Main thread blocked because task thread not calling back')
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return r
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# interaction interface - should be called from other threads
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def notify(self, msg, n=3):
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self.message_time = n
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self.message(msg)
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self.request_or_notify_queue.put(msg)
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# below Really ought to be called from threads other than the mainloop because they block
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def confirm(self, q):
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"""Expected to return True or False, given question prompt q"""
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self.prompt = q
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self.in_confirm = True
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self.request_or_notify_queue.put(q)
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return self.response_queue.get()
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def file_prompt(self, s):
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"""Expected to return a file name, given """
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self.prompt = s
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self.in_prompt = True
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self.request_or_notify_queue.put(s)
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r = self.response_queue.get()
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return r
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‎bpython/scrollfrontend/manual_readline.py‎

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"""implementations of simple readline control sequences
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just the ones that fit the model of transforming the current line
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and the cursor location
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in the order of description at http://www.bigsmoke.us/readline/shortcuts"""
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from bpython.scrollfrontend.friendly import NotImplementedError
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import re
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char_sequences = {}
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#TODO fix this - should use value in repl.
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# Sadly, this breaks the pure function aspect of backspace!
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INDENT = 4
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#TODO make an object out of this so instances can have keybindings via config
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def on(seq):
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def add_to_char_sequences(func):
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char_sequences[seq] = func
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return func
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return add_to_char_sequences
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@on('')
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@on('')
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@on(chr(2))
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@on('KEY_LEFT')
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def left_arrow(cursor_offset, line):
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return max(0, cursor_offset - 1), line
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@on('')
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@on('')
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@on(chr(6))
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@on('KEY_RIGHT')
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def right_arrow(cursor_offset, line):
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return min(len(line), cursor_offset + 1), line
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@on('')
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@on('KEY_HOME')
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def beginning_of_line(cursor_offset, line):
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return 0, line
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@on('')
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@on('KEY_END')
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def end_of_line(cursor_offset, line):
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return len(line), line
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@on('f')
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@on('\x1bOC')
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def forward_word(cursor_offset, line):
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patt = r"\S\s"
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match = re.search(patt, line[cursor_offset:]+' ')
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delta = match.end() - 1 if match else 0
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return (cursor_offset + delta, line)
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@on('b')
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@on('\x1bOD')
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def back_word(cursor_offset, line):
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return (last_word_pos(line[:cursor_offset]), line)
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def last_word_pos(string):
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"""returns the start index of the last word of given string"""
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patt = r'\S\s'
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match = re.search(patt, string[::-1])
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index = match and len(string) - match.end() + 1
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return index or 0
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@on('[3~')
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@on('KEY_DC')
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def delete(cursor_offset, line):
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return (cursor_offset,
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line[:cursor_offset] + line[cursor_offset+1:])
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@on('')
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@on('')
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@on('KEY_BACKSPACE')
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def backspace(cursor_offset, line):
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if cursor_offset == 0:
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return cursor_offset, line
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if not line[:cursor_offset].strip(): #if just whitespace left of cursor
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front_white = len(line[:cursor_offset]) - len(line[:cursor_offset].lstrip())
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to_delete = ((front_white - 1) % INDENT) + 1
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return cursor_offset - to_delete, line[:to_delete]
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return (cursor_offset - 1,
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line[:cursor_offset - 1] + line[cursor_offset:])
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@on('')
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def delete_from_cursor_back(cursor_offset, line):
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return 0, line[cursor_offset:]
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@on(' ')
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def delete_from_cursor_forward(cursor_offset, line):
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return cursor_offset, line[:cursor_offset]
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@on('d')
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def delete_rest_of_word(cursor_offset, line):
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raise NotImplementedError()
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@on('')
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def delete_word_to_cursor(cursor_offset, line):
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raise NotImplementedError()
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@on('y')
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def yank_prev_prev_killed_text(cursor_offset, line):
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raise NotImplementedError()
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@on('')
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def transpose_character_before_cursor(cursor_offset, line):
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raise NotImplementedError()
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@on('t')
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def transpose_word_before_cursor(cursor_offset, line):
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raise NotImplementedError()
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# bonus functions (not part of readline)
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@on('\x1b\x7f')
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@on('\xff')
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def delete_word_from_cursor_back(cursor_offset, line):
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raise NotImplementedError()
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def get_updated_char_sequences(key_dispatch, config):
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updated_char_sequences = dict(char_sequences)
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updated_char_sequences[key_dispatch[config.delete_key]] = backspace
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updated_char_sequences[key_dispatch[config.clear_word_key]] = delete_word_to_cursor
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updated_char_sequences[key_dispatch[config.clear_line_key]] = delete_from_cursor_back
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return updated_char_sequences
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if __name__ == '__main__':
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import doctest; doctest.testmod()
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from pprint import pprint
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pprint(char_sequences)
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