FIX: Typing annotations (#12683)
Running `mypy -p IPython.sphinxext` raised a few errors. Fix them and
strip some trailing whitespace from a few places.
PR: Unassigned allowed commands (#14564)
From git git:
> Modify binding mechanism to allow binding to one of a set of
whitelisted commands, Add five such commands ("beginning_of_buffer",
"end_of_buffer", "end_of_line", "forward_word", "unix_line_discard").
Currently, only commands which are assigned by default are allowed to be
reassigned:
```python
known_commands = {
create_identifier(binding.command): binding.command
for binding in KEY_BINDINGS
}
...
if command_id not in known_commands:
...
raise ValueError(
f"{command_id} is not a known shortcut command."
f" Allowed commands are: \n - {allowed_commands}"
)
```
This PR adds a List UNASSIGNED_ALLOWED_COMMANDS and updates
`known_commands` (now renamed to be more clear as `allowed_commands`):
```python
allowed_commands.update({
create_identifier(command): command
for command in UNASSIGNED_ALLOWED_COMMANDS
})
```
The five unassigned allowed commands are:
```python
UNASSIGNED_ALLOWED_COMMANDS = [
nc.beginning_of_buffer,
nc.end_of_buffer,
nc.end_of_line,
nc.forward_word,
nc.unix_line_discard,
]
```
Motivation tldr: Until now, it is not possible to bind eg the common
keybindng `ctrl+e` to prompt_toolkit's `end_of_line` (because it is not
bound by default).
Full motivation: https://github.com/ipython/ipython/issues/14369
M Bussonnier