Inject a two-way comm bridge into pyzo

[edreamleo]

This is a bad idea. The bridge would not be useful even if it existed.

See #1409 for notes common to all comm bridges.

The pyzo_in_leo plugin (or a new plugin) could inject code a full two-way comm bridge into pyzo, communicating with similar code in Leo. This would allow pyzo and Leo to run separately, but linked.

• The comm bridge would provide Leonine commands for many pyzo functions.
• The comm bridge would tell Leo what files are open in pyzo, and perhaps other data.

Simulating the minibuffer

To execute Leo commands, users would likely use pyzo Logger tool as a minibuffer.

• Import leo somehow.
• Add a convenience method (in pyzo) that would execute Leo commands by name.

Implementation

• The comm bridge would likely use yoton, pyzo's ipc system.
• The comm bridge might use MessagePack, the JSON-like tool used by neovim.

[edreamleo]

The following script imports yoton without importing pyzo, similar to pyzo's yotonloader.py:

import os
import sys
from shutil import which
# Fail if can't find pyzo.exe.
pyzo_exec = which('pyzo')
if not pyzo_exec:
    raise ImportError('can not find pyzo executable')
# Adjust sys.path
pyzo_dir = os.path.dirname(pyzo_exec)
yoton_dir = os.path.join(pyzo_dir, 'source', 'pyzo')
sys.path.insert(0, yoton_dir)
# Import yoton and reset sys.path.
import yoton
sys.path.pop(0)