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"""Python client for Nvim. |
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Client library for talking with Nvim processes via it's msgpack-rpc API. |
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""" |
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import logging |
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import os |
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import sys |
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from .api import DecodeHook, Nvim, SessionHook |
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from .msgpack_rpc import (ErrorResponse, child_session, socket_session, stdio_session, |
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tcp_session) |
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from .plugin import (Host, autocmd, command, encoding, function, plugin, |
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rpc_export, shutdown_hook) |
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__all__ = ('tcp_session', 'socket_session', 'stdio_session', 'child_session', |
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'start_host', 'autocmd', 'command', 'encoding', 'function', |
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'plugin', 'rpc_export', 'Host', 'DecodeHook', 'Nvim', |
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'SessionHook', 'shutdown_hook', 'attach', 'setup_logging', |
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'ErrorResponse') |
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def start_host(session=None): |
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"""Promote the current process into python plugin host for Nvim. |
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Start msgpack-rpc event loop for `session`, listening for Nvim requests |
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and notifications. It registers Nvim commands for loading/unloading |
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python plugins. |
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The sys.stdout and sys.stderr streams are redirected to Nvim through |
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`session`. That means print statements probably won't work as expected |
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while this function doesn't return. |
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This function is normally called at program startup and could have been |
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defined as a separate executable. It is exposed as a library function for |
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testing purposes only. |
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""" |
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plugins = [] |
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for arg in sys.argv: |
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_, ext = os.path.splitext(arg) |
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if ext == '.py': |
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plugins.append(arg) |
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elif os.path.isdir(arg): |
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init = os.path.join(arg, '__init__.py') |
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if os.path.isfile(init): |
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plugins.append(arg) |
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# This is a special case to support the old workaround of |
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# adding an empty .py file to make a package directory |
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# visible, and it should be removed soon. |
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for path in list(plugins): |
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dup = path + ".py" |
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if os.path.isdir(path) and dup in plugins: |
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plugins.remove(dup) |
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if not plugins: |
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sys.exit('must specify at least one plugin as argument') |
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setup_logging() |
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if not session: |
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session = stdio_session() |
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host = Host(Nvim.from_session(session)) |
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host.start(plugins) |
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def attach(session_type, address=None, port=None, path=None, argv=None): |
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"""Provide a nicer interface to create python api sessions. |
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Previous machinery to create python api sessions is still there. This only |
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creates a facade function to make things easier for the most usual cases. |
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Thus, instead of: |
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from neovim import socket_session, Nvim |
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session = tcp_session(address=<address>, port=<port>) |
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nvim = Nvim.from_session(session) |
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You can now do: |
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from neovim import attach |
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nvim = attach('tcp', address=<address>, port=<port>) |
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And also: |
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nvim = attach('socket', path=<path>) |
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nvim = attach('child', argv=<argv>) |
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nvim = attach('stdio') |
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""" |
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session = (tcp_session(address, port) if session_type == 'tcp' else |
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socket_session(path) if session_type == 'socket' else |
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stdio_session() if session_type == 'stdio' else |
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child_session(argv) if session_type == 'child' else |
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None) |
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if not session: |
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raise Exception('Unknown session type "%s"' % session_type) |
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return Nvim.from_session(session) |
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def setup_logging(): |
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"""Setup logging according to environment variables.""" |
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logger = logging.getLogger(__name__) |
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if 'NVIM_PYTHON_LOG_FILE' in os.environ: |
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logfile = (os.environ['NVIM_PYTHON_LOG_FILE'].strip() + |
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'_' + str(os.getpid())) |
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handler = logging.FileHandler(logfile, 'w') |
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handler.formatter = logging.Formatter( |
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'%(asctime)s [%(levelname)s @ ' |
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'%(filename)s:%(funcName)s:%(lineno)s] %(process)s - %(message)s') |
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logging.root.addHandler(handler) |
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level = logging.INFO |
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if 'NVIM_PYTHON_LOG_LEVEL' in os.environ: |
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l = getattr(logging, |
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os.environ['NVIM_PYTHON_LOG_LEVEL'].strip(), |
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level) |
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if isinstance(l, int): |
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level = l |
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logger.setLevel(level) |
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116
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# Required for python 2.6 |
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class NullHandler(logging.Handler): |
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def emit(self, record): |
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pass |
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122
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if not logging.root.handlers: |
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logging.root.addHandler(NullHandler()) |
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neovim /
python-client
