# -*- coding: utf-8 -*-
"""Key bindings for prompt_toolkit xonsh shell."""
import builtins
from prompt_toolkit import search
from prompt_toolkit.enums import DEFAULT_BUFFER
from prompt_toolkit.filters import (
Condition,
IsMultiline,
HasSelection,
EmacsInsertMode,
ViInsertMode,
IsSearching,
)
from prompt_toolkit.keys import Keys
from prompt_toolkit.application.current import get_app
from xonsh.aliases import xonsh_exit
from xonsh.tools import check_for_partial_string, get_line_continuation
from xonsh.shell import transform_command
DEDENT_TOKENS = frozenset(["raise", "return", "pass", "break", "continue"])
[docs]def carriage_return(b, cli, *, autoindent=True):
"""Preliminary parser to determine if 'Enter' key should send command to the
xonsh parser for execution or should insert a newline for continued input.
Current 'triggers' for inserting a newline are:
- Not on first line of buffer and line is non-empty
- Previous character is a colon (covers if, for, etc...)
- User is in an open paren-block
- Line ends with backslash
- Any text exists below cursor position (relevant when editing previous
multiline blocks)
"""
doc = b.document
at_end_of_line = _is_blank(doc.current_line_after_cursor)
current_line_blank = _is_blank(doc.current_line)
env = builtins.__xonsh__.env
indent = env.get("INDENT") if autoindent else ""
partial_string_info = check_for_partial_string(doc.text)
in_partial_string = (
partial_string_info[0] is not None and partial_string_info[1] is None
)
# indent after a colon
if doc.current_line_before_cursor.strip().endswith(":") and at_end_of_line:
b.newline(copy_margin=autoindent)
b.insert_text(indent, fire_event=False)
# if current line isn't blank, check dedent tokens
elif (
not current_line_blank
and doc.current_line.split(maxsplit=1)[0] in DEDENT_TOKENS
and doc.line_count > 1
):
b.newline(copy_margin=autoindent)
b.delete_before_cursor(count=len(indent))
elif not doc.on_first_line and not current_line_blank:
b.newline(copy_margin=autoindent)
elif doc.current_line.endswith(get_line_continuation()):
b.newline(copy_margin=autoindent)
elif doc.find_next_word_beginning() is not None and (
any(not _is_blank(i) for i in doc.lines_from_current[1:])
):
b.newline(copy_margin=autoindent)
elif not current_line_blank and not can_compile(doc.text):
b.newline(copy_margin=autoindent)
elif current_line_blank and in_partial_string:
b.newline(copy_margin=autoindent)
else:
b.validate_and_handle()
def _is_blank(l):
return len(l.strip()) == 0
[docs]def can_compile(src):
"""Returns whether the code can be compiled, i.e. it is valid xonsh."""
src = src if src.endswith("\n") else src + "\n"
src = transform_command(src, show_diff=False)
src = src.lstrip()
try:
builtins.__xonsh__.execer.compile(
src, mode="single", glbs=None, locs=builtins.__xonsh__.ctx
)
rtn = True
except SyntaxError:
rtn = False
except Exception:
rtn = True
return rtn
@Condition
def tab_insert_indent():
"""Check if <Tab> should insert indent instead of starting autocompletion.
Checks if there are only whitespaces before the cursor - if so indent
should be inserted, otherwise autocompletion.
"""
before_cursor = get_app().current_buffer.document.current_line_before_cursor
return bool(before_cursor.isspace())
@Condition
def beginning_of_line():
"""Check if cursor is at beginning of a line other than the first line in a
multiline document
"""
app = get_app()
before_cursor = app.current_buffer.document.current_line_before_cursor
return bool(
len(before_cursor) == 0 and not app.current_buffer.document.on_first_line
)
@Condition
def end_of_line():
"""Check if cursor is at the end of a line other than the last line in a
multiline document
"""
d = get_app().current_buffer.document
at_end = d.is_cursor_at_the_end_of_line
last_line = d.is_cursor_at_the_end
return bool(at_end and not last_line)
@Condition
def should_confirm_completion():
"""Check if completion needs confirmation"""
return (
builtins.__xonsh__.env.get("COMPLETIONS_CONFIRM")
and get_app().current_buffer.complete_state
)
# Copied from prompt-toolkit's key_binding/bindings/basic.py
@Condition
def ctrl_d_condition():
"""Ctrl-D binding is only active when the default buffer is selected and
empty.
"""
if builtins.__xonsh__.env.get("IGNOREEOF"):
return False
else:
app = get_app()
buffer_name = app.current_buffer.name
return buffer_name == DEFAULT_BUFFER and not app.current_buffer.text
@Condition
def autopair_condition():
"""Check if XONSH_AUTOPAIR is set"""
return builtins.__xonsh__.env.get("XONSH_AUTOPAIR", False)
@Condition
def whitespace_or_bracket_before():
"""Check if there is whitespace or an opening
bracket to the left of the cursor"""
d = get_app().current_buffer.document
return bool(
d.cursor_position == 0
or d.char_before_cursor.isspace()
or d.char_before_cursor in "([{"
)
@Condition
def whitespace_or_bracket_after():
"""Check if there is whitespace or a closing
bracket to the right of the cursor"""
d = get_app().current_buffer.document
return bool(
d.is_cursor_at_the_end_of_line
or d.current_char.isspace()
or d.current_char in ")]}"
)
[docs]def load_xonsh_bindings(key_bindings):
"""
Load custom key bindings.
"""
handle = key_bindings.add
has_selection = HasSelection()
insert_mode = ViInsertMode() | EmacsInsertMode()
@handle(Keys.Tab, filter=tab_insert_indent)
def insert_indent(event):
"""
If there are only whitespaces before current cursor position insert
indent instead of autocompleting.
"""
env = builtins.__xonsh__.env
event.cli.current_buffer.insert_text(env.get("INDENT"))
@handle(Keys.ControlX, Keys.ControlE, filter=~has_selection)
def open_editor(event):
""" Open current buffer in editor """
event.current_buffer.open_in_editor(event.cli)
@handle(Keys.BackTab, filter=insert_mode)
def insert_literal_tab(event):
""" Insert literal tab on Shift+Tab instead of autocompleting """
b = event.current_buffer
if b.complete_state:
b.complete_previous()
else:
env = builtins.__xonsh__.env
event.cli.current_buffer.insert_text(env.get("INDENT"))
@handle("(", filter=autopair_condition & whitespace_or_bracket_after)
def insert_right_parens(event):
event.cli.current_buffer.insert_text("(")
event.cli.current_buffer.insert_text(")", move_cursor=False)
@handle(")", filter=autopair_condition)
def overwrite_right_parens(event):
buffer = event.cli.current_buffer
if buffer.document.current_char == ")":
buffer.cursor_position += 1
else:
buffer.insert_text(")")
@handle("[", filter=autopair_condition & whitespace_or_bracket_after)
def insert_right_bracket(event):
event.cli.current_buffer.insert_text("[")
event.cli.current_buffer.insert_text("]", move_cursor=False)
@handle("]", filter=autopair_condition)
def overwrite_right_bracket(event):
buffer = event.cli.current_buffer
if buffer.document.current_char == "]":
buffer.cursor_position += 1
else:
buffer.insert_text("]")
@handle("{", filter=autopair_condition & whitespace_or_bracket_after)
def insert_right_brace(event):
event.cli.current_buffer.insert_text("{")
event.cli.current_buffer.insert_text("}", move_cursor=False)
@handle("}", filter=autopair_condition)
def overwrite_right_brace(event):
buffer = event.cli.current_buffer
if buffer.document.current_char == "}":
buffer.cursor_position += 1
else:
buffer.insert_text("}")
@handle("'", filter=autopair_condition)
def insert_right_quote(event):
buffer = event.cli.current_buffer
if buffer.document.current_char == "'":
buffer.cursor_position += 1
elif whitespace_or_bracket_before() and whitespace_or_bracket_after():
buffer.insert_text("'")
buffer.insert_text("'", move_cursor=False)
else:
buffer.insert_text("'")
@handle('"', filter=autopair_condition)
def insert_right_double_quote(event):
buffer = event.cli.current_buffer
if buffer.document.current_char == '"':
buffer.cursor_position += 1
elif whitespace_or_bracket_before() and whitespace_or_bracket_after():
buffer.insert_text('"')
buffer.insert_text('"', move_cursor=False)
else:
buffer.insert_text('"')
@handle(Keys.Backspace, filter=autopair_condition)
def delete_brackets_or_quotes(event):
"""Delete empty pair of brackets or quotes"""
buffer = event.cli.current_buffer
before = buffer.document.char_before_cursor
after = buffer.document.current_char
if any(
[before == b and after == a for (b, a) in ["()", "[]", "{}", "''", '""']]
):
buffer.delete(1)
buffer.delete_before_cursor(1)
@handle(Keys.ControlD, filter=ctrl_d_condition)
def call_exit_alias(event):
"""Use xonsh exit function"""
b = event.cli.current_buffer
b.validate_and_handle()
xonsh_exit([])
@handle(Keys.ControlJ, filter=IsMultiline() & insert_mode)
@handle(Keys.ControlM, filter=IsMultiline() & insert_mode)
def multiline_carriage_return(event):
""" Wrapper around carriage_return multiline parser """
b = event.cli.current_buffer
carriage_return(b, event.cli)
@handle(Keys.ControlJ, filter=should_confirm_completion)
@handle(Keys.ControlM, filter=should_confirm_completion)
def enter_confirm_completion(event):
"""Ignore <enter> (confirm completion)"""
event.current_buffer.complete_state = None
@handle(Keys.Escape, filter=should_confirm_completion)
def esc_cancel_completion(event):
"""Use <ESC> to cancel completion"""
event.cli.current_buffer.cancel_completion()
@handle(Keys.Escape, Keys.ControlJ)
def execute_block_now(event):
"""Execute a block of text irrespective of cursor position"""
b = event.cli.current_buffer
b.validate_and_handle()
@handle(Keys.Left, filter=beginning_of_line)
def wrap_cursor_back(event):
"""Move cursor to end of previous line unless at beginning of
document
"""
b = event.cli.current_buffer
b.cursor_up(count=1)
relative_end_index = b.document.get_end_of_line_position()
b.cursor_right(count=relative_end_index)
@handle(Keys.Right, filter=end_of_line)
def wrap_cursor_forward(event):
"""Move cursor to beginning of next line unless at end of document"""
b = event.cli.current_buffer
relative_begin_index = b.document.get_start_of_line_position()
b.cursor_left(count=abs(relative_begin_index))
b.cursor_down(count=1)
@handle(Keys.ControlM, filter=IsSearching())
@handle(Keys.ControlJ, filter=IsSearching())
def accept_search(event):
search.accept_search()
@handle(Keys.ControlZ)
def skip_control_z(event):
"""Prevents the writing of ^Z to the prompt, if Ctrl+Z was pressed
during the previous command.
"""
pass
