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#!/usr/bin/env python3
# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
#
import logging
import os
from typing import Any, List, Tuple
from prompt_toolkit import PromptSession
from prompt_toolkit.auto_suggest import AutoSuggestFromHistory
from prompt_toolkit.completion import Completer
from prompt_toolkit.document import Document
from prompt_toolkit.enums import EditingMode
from prompt_toolkit.formatted_text import PygmentsTokens
from prompt_toolkit.history import FileHistory, InMemoryHistory
from prompt_toolkit.layout.processors import HighlightMatchingBracketProcessor
from prompt_toolkit.lexers import PygmentsLexer
from prompt_toolkit.patch_stdout import patch_stdout
from termcolor import cprint
from nubia.internal.helpers import catchall, find_approx, suggestions_msg, try_await
from nubia.internal.io.eventbus import Listener
from nubia.internal.options import Options
from nubia.internal.ui.lexer import NubiaLexer
from nubia.internal.ui.style import shell_style
def split_command(text):
return text.lstrip(" ").split(" ", 1)
class IOLoop(Listener):
def __init__(self, context, plugin, usagelogger, options: Options):
self._ctx = context
self._command_registry = self._ctx.registry
self._plugin = plugin
self._options = options
self._blacklist = self._plugin.getBlacklistPlugin()
self._status_bar = self._plugin.get_status_bar(context)
self._completer = ShellCompleter(self._command_registry)
self._command_registry.register_listener(self)
self._usagelogger = usagelogger
def _build_cli(self):
if self._options.persistent_history:
history = FileHistory(
os.path.join(
os.path.expanduser("~"), ".{}_history".format(self._ctx.binary_name)
)
)
else:
history = InMemoryHistory()
# If EDITOR does not exist, take EMACS
# if it does, try fit the EMACS/VI pattern using upper
editor = getattr(
EditingMode, os.environ.get("EDITOR", "EMACS").upper(), EditingMode.EMACS
)
return PromptSession(
history=history,
auto_suggest=AutoSuggestFromHistory(),
lexer=PygmentsLexer(NubiaLexer),
completer=self._completer,
input_processors=[HighlightMatchingBracketProcessor(chars="[](){}")],
style=shell_style,
bottom_toolbar=self._get_bottom_toolbar,
editing_mode=editor,
complete_in_thread=True,
refresh_interval=1,
include_default_pygments_style=False,
)
def _get_prompt_tokens(self) -> List[Tuple[Any, str]]:
return self._plugin.get_prompt_tokens(self._ctx)
def _get_bottom_toolbar(self) -> List[Tuple[Any, str]]:
return PygmentsTokens(self._status_bar.get_tokens())
async def parse_and_evaluate(self, input):
command_parts = split_command(input)
if command_parts and command_parts[0]:
cmd = command_parts[0]
args = command_parts[1] if len(command_parts) > 1 else None
return await self.evaluate_command(cmd, args, input)
async def evaluate_command(self, cmd, args, raw):
args = args or ""
if cmd in self._command_registry:
cmd_instance = self._command_registry.find_command(cmd)
else:
suggestions = find_approx(
cmd, self._command_registry.get_all_commands_map()
)
if self._options.auto_execute_single_suggestions and len(suggestions) == 1:
print()
cprint(
"Auto-correcting '{}' to '{}'".format(cmd, suggestions[0]),
"red",
attrs=["bold"],
)
cmd_instance = self._command_registry.find_command(suggestions[0])
else:
print()
cprint(
"Unknown Command '{}'{} type `help` to see all "
"available commands".format(cmd, suggestions_msg(suggestions)),
"red",
attrs=["bold"],
)
cmd_instance = None
if cmd_instance is not None:
try:
ret = self._blacklist.is_blacklisted(cmd)
if ret:
return ret
except Exception as e:
err_message = (
"Blacklist executing failed, "
"all commands are available.\n"
"{}".format(str(e))
)
cprint(err_message, "red")
logging.error(err_message)
try:
catchall(self._usagelogger.pre_exec)
result = await try_await(cmd_instance.run_interactive(cmd, args, raw))
catchall(self._usagelogger.post_exec, cmd, args, result, False)
self._status_bar.set_last_command_status(result)
return result
except NotImplementedError as e:
cprint("[NOT IMPLEMENTED]: {}".format(str(e)), "yellow", attrs=["bold"])
# not implemented error code
return 99
async def run(self):
prompt = self._build_cli()
self._status_bar.start()
try:
while True:
try:
with patch_stdout():
text = await prompt.prompt_async(
PygmentsTokens(self._get_prompt_tokens()),
rprompt=PygmentsTokens(
self._status_bar.get_rprompt_tokens()
),
)
session_logger = self._plugin.get_session_logger(self._ctx)
if session_logger:
# Commands don't get written to stdout, so we have to
# explicitly dump them to the session log.
session_logger.log_command(text)
with session_logger.patch():
await self.parse_and_evaluate(text)
else:
await self.parse_and_evaluate(text)
except KeyboardInterrupt:
pass
except EOFError:
# Application exiting.
pass
self._status_bar.stop()
async def on_connected(self, *args, **kwargs):
pass
class ShellCompleter(Completer):
def __init__(self, command_registry):
super(Completer, self).__init__()
self._command_registry = command_registry
def get_completions(self, document, complete_event):
if document.on_first_line:
cmd_and_args = split_command(document.text_before_cursor)
# are we the first word? suggest from command names
if len(cmd_and_args) > 1:
cmd, args = cmd_and_args
# pass to the children
# let's find the parent command first
cmd_instance = self._command_registry.find_command(cmd)
if not cmd_instance:
return []
return cmd_instance.get_completions(
cmd,
Document(
args, document.cursor_position - len(document.text) + len(args)
),
complete_event,
)
else:
return self._command_registry.get_completions(document, complete_event)
return []
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