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repl.py
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repl.py
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""" Druid REPL """
# pylint: disable=C0103
from abc import ABC, abstractmethod
import asyncio
import logging
import logging.config
import os
import sys
from prompt_toolkit.completion import Completer, PathCompleter, WordCompleter
from prompt_toolkit.eventloop.defaults import use_asyncio_event_loop
from prompt_toolkit.patch_stdout import patch_stdout
from prompt_toolkit.application import Application
from prompt_toolkit.application.current import get_app
from prompt_toolkit.document import Document
from prompt_toolkit.filters import to_filter
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.layout.containers import (
to_container,
Container, FloatContainer, Float,
VSplit, HSplit,
Window, WindowAlign,
)
from prompt_toolkit.layout.layout import Layout
from prompt_toolkit.layout.screen import Char
from prompt_toolkit.styles import Style
from prompt_toolkit.widgets import TextArea
from prompt_toolkit.layout.controls import FormattedTextControl
from prompt_toolkit.layout.menus import CompletionsMenu
from druid.crow import Crow
logger = logging.getLogger(__name__)
# monkey patch to fix https://github.com/monome/druid/issues/8
Char.display_mappings['\t'] = ' '
druid_intro = "//// druid. q to quit. h for help\n\n"
druid_help = """
h this menu
r runs previous script that was run with r <filename>
u uploads 'sketch.lua'
r <filename> run <filename>
u <filename> upload <filename>
p print current userscript
q quit
"""
last_script = ''
class DruidUi:
def __init__(self):
self.statusbar = Window(
height=1,
char='/',
style='class:line',
content=FormattedTextControl(text='druid////'),
align=WindowAlign.RIGHT
)
self.content = HSplit([
Window(),
self.statusbar,
Window(height=1),
])
self.container = FloatContainer(
content=self.content,
floats=[
Float(
xcursor=True,
ycursor=True,
content=CompletionsMenu(max_height=16, scroll_offset=1),
),
],
)
self.key_bindings = KeyBindings()
@self.key_bindings.add('c-c', eager=True)
@self.key_bindings.add('c-q', eager=True)
def quit_druid(event):
event.app.exit()
self.style = Style([
('capture-field', '#747369'),
('output-field', '#d3d0c8'),
('input-field', '#f2f0ec'),
('line', '#747369'),
('scrollbar.background', 'bg:#000000'),
('scrollbar.button', 'bg:#747369'),
])
self.layout = Layout(self.container)
self.app = Application(
layout=self.layout,
key_bindings=self.key_bindings,
style=self.style,
mouse_support=True,
full_screen=True,
)
self.pages = dict()
self.current_page = None
def set_page(self, name):
if self.current_page is not None:
self.current_page.unmount()
try:
self.current_page = self.pages[name]
except KeyError:
pass
else:
self.current_page.mount()
def add_page(self, key, page):
self.pages[key] = page
class UiPage(ABC):
def __init__(self, ui):
self.ui = ui
self.build_ui()
@abstractmethod
def build_ui(self):
pass
@abstractmethod
def arrange_ui(self, container):
pass
def output_to_field(self, field, st):
s = field.text + st.replace('\r', '')
field.buffer.document = Document(text=s, cursor_position=len(s))
def mount(self):
self.arrange_ui(self.ui.content)
def unmount(self):
pass
class ReplCompleter(Completer):
CROW_COMMANDS = {
"bootloader": "Reboot into bootloader",
"clear": "Clear the saved user script",
"first": "Set First as the current script and reboot",
"help": "Show help",
"identity": "Show crow's serial number",
"kill": "Restart the Lua environment",
"print": "Print the current user script",
"quit": "Quit druid",
"reset": "Reboot crow",
"run": "Send a file to crow and run it",
"upload": "Send a file to crow, store and run it",
"version": "Print the current firmware version"
}
def __init__(self):
self.path_completer = PathCompleter(
file_filter=lambda s: os.path.isdir(s) or s.endswith('.lua')
)
self.word_completer = WordCompleter(
words=self.CROW_COMMANDS.keys(),
ignore_case=True,
meta_dict=self.CROW_COMMANDS,
)
def offset_document(self, document, offset):
move_cursor = len(document.current_line) - offset
return Document(
document.current_line[offset:],
cursor_position=document.cursor_position - offset
)
def get_completions(self, document, complete_event):
line = document.current_line.lstrip()
offset = len(document.current_line) - len(line)
if line.startswith('^^'):
line = line[2:]
offset += 2
new_document = self.offset_document(document, offset)
yield from self.word_completer.get_completions(new_document, complete_event)
elif line.startswith('r ') or line.startswith('u '):
line = line[2:]
offset += 2
rem = line.lstrip()
offset += len(line) - len(rem)
new_document = self.offset_document(document, offset)
yield from self.path_completer.get_completions(new_document, complete_event)
class DruidRepl(UiPage):
def __init__(self, ui, crow):
self.crow = crow
self.completer = ReplCompleter()
super().__init__(ui)
on_disconnect = lambda exc: self.output(' <crow disconnected>\n')
self.handlers = {
'connect': [lambda: self.output(' <crow connected>\n')],
'connect_err': [on_disconnect],
'disconnect': [on_disconnect],
'running': [lambda fname: self.output(f'running {fname}\n')],
'uploading': [lambda fname: self.output(f'uploading {fname}\n')],
'crow_event': [self.crow_event],
'crow_output': [lambda output: self.output(output + '\n')],
}
def build_ui(self):
self.captures = [
TextArea(style='class:capture-field', height=2),
TextArea(style='class:capture-field', height=2),
]
self.output_field = TextArea(
style='class:output-field',
text=druid_intro,
scrollbar=True,
)
self.output_field.window.right_margins[0].display_arrows = to_filter(False)
self.input_field = TextArea(
height=1,
prompt='> ',
multiline=False,
wrap_lines=False,
style='class:input-field',
completer=self.completer,
complete_while_typing=True,
)
self.input_field.accept_handler = self.accept
def arrange_ui(self, container):
container.children.clear()
container.children.extend([
VSplit(self.captures),
to_container(self.output_field),
self.ui.statusbar,
to_container(self.input_field),
])
def mount(self):
self.crow.replace_handlers(self.handlers)
super().mount()
pgup = lambda evt: self.pageup(evt, self.output_field)
pgdn = lambda evt: self.pagedown(evt, self.output_field)
self.ui.key_bindings.add('pageup')(pgup)
self.ui.key_bindings.add('escape', 'v')(pgup)
self.ui.key_bindings.add('pagedown')(pgdn)
self.ui.key_bindings.add('c-v')(pgdn)
self.ui.layout.focus(self.input_field)
def output(self, st):
self.output_field.buffer.cursor_position = len(self.output_field.buffer.text)
self.output_field.buffer.insert_text(st.replace('\r', ''))
def accept(self, buff):
self.output(f'\n> {self.input_field.text}\n')
self.parse(self.input_field.text)
def parse(self, cmd):
parts = cmd.split(maxsplit=1)
if len(parts) == 0:
return
c = parts[0]
if c == 'r' or c == 'u':
run_func = self.crow.upload if c == 'u' else self.crow.execute
global last_script
if len(parts) == 1:
if len(last_script) == 0:
self.output('call r <filename> to run a script.')
else:
run_func(last_script)
elif len(parts) == 2 and os.path.isfile(parts[1]):
last_script = parts[1]
run_func(parts[1])
else:
self.crow.writeline(cmd)
elif len(parts) == 1:
if c == 'q':
print('bye.')
get_app().exit()
elif c == 'p':
self.crow.write('^^p')
elif c == 'h':
self.output(druid_help)
else:
self.crow.writeline(cmd)
else:
self.crow.writeline(cmd)
def crow_event(self, line, event, args):
if event == 'stream' or event == 'change':
ch_str, val = args
ch = int(ch_str)
if ch >= 1 and ch <= 2:
self.output_to_field(self.captures[ch - 1], f'\ninput[{ch}] = {val}\n')
else:
self.output(f'^^{event}({", ".join(args)})')
# these come from:
# https://github.com/prompt-toolkit/python-prompt-toolkit/blob/5c3d13eb849885bc4c1a2553ea6f81e6272f84c9/prompt_toolkit/key_binding/bindings/scroll.py#L147
def pageup(self, event, field):
w = field.window
b = field.buffer
if w and w.render_info:
# Put cursor at the first visible line. (But make sure that the cursor
# moves at least one line up.)
line_index = max(
0,
min(w.render_info.first_visible_line(), b.document.cursor_position_row - 1),
)
b.cursor_position = b.document.translate_row_col_to_index(line_index, 0)
b.cursor_position += b.document.get_start_of_line_position(
after_whitespace=True
)
# Set the scroll offset. We can safely set it to zero; the Window will
# make sure that it scrolls at least until the cursor becomes visible.
w.vertical_scroll = 0
def pagedown(self, event, field):
w = field.window
b = field.buffer
if w and w.render_info:
# Scroll down one page.
line_index = max(w.render_info.last_visible_line(), w.vertical_scroll + 1)
w.vertical_scroll = line_index
b.cursor_position = b.document.translate_row_col_to_index(line_index, 0)
b.cursor_position += b.document.get_start_of_line_position(
after_whitespace=True
)
class Druid:
def __init__(self, crow):
self.crow = crow
self.ui = DruidUi()
self.ui.add_page('repl', DruidRepl(ui=self.ui, crow=crow))
self.ui.set_page('repl')
async def foreground(self, script=None):
if script is not None:
if self.crow.is_connected == False:
print('no crow device found. exiting.')
return
self.crow.execute(script)
return await self.ui.app.run_async()
async def background(self):
await self.crow.read_forever()
log_config = {
'version': 1,
'formatters': {
'detailed': {
'class': 'logging.Formatter',
'format': '%(asctime)s %(name)-15s %(levelname)-8s'
'%(processName)-10s %(message)s'
},
},
'handlers': {
'file': {
'class': 'logging.FileHandler',
'filename': 'druid.log',
'mode': 'w',
'formatter': 'detailed',
},
},
'loggers': {
'druid.repl': {
'handlers': ['file'],
},
'druid.crow': {
'handlers': ['file'],
},
},
'root': {
'level': 'INFO',
'handlers': [],
},
}
def main(script=None):
try:
logging.config.dictConfig(log_config)
except ValueError:
print('could not configure file logging (insufficient permissions?)')
loop = asyncio.get_event_loop()
use_asyncio_event_loop()
with patch_stdout():
with Crow() as crow:
shell = Druid(crow)
crow.reconnect(err_event=True)
background_task = asyncio.gather(
shell.background(),
return_exceptions=True,
)
loop.run_until_complete(shell.foreground())
background_task.cancel()