Reddel-Server

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Python EPC server component for reddel. It provides an easy way to send (python) source code from Emacs to the server, inspect or transform it via Redbaron and send the result back.

An example on how to expose a simple function to add arguments:

# file: myprovidermod.py
import reddel_server

class MyProvider(reddel_server.ProviderBase)
    @reddel_server.red_src()
    @reddel_server.red_validate([reddel_server.OptionalRegionValidator(),
                                 reddel_server.SingleNodeValidator(),
                                 reddel_server.TypeValidator(["def"])])
    def add_arg(self, red, start, end, index, arg):
        red.arguments.insert(index, arg)
        return red

Start the reddel server from Emacs:

>>> (require 'epc)

>>> (defvar my-epc (epc:start-epc "reddel" nil))

>>> ;; make sure myprovidermod is in a directory within the PYTHONPATH
>>> (epc:call-sync my-epc 'add_provider '("myprovidermod.MyProvider"))

>>> (message (epc:call-sync my-epc 'add_arg '("def foo(arg1, arg3): pass" nil nil 1 "arg2")))
"def foo(arg1, arg2, arg3): pass"

Redbaron provides a lossless format, so even formatting and comments are preserved.

Installation

At the command line:

pip install reddel-server

Usage

You can start a reddel server from within Emacs like shown above or start it from the command line. A executable reddel is provided by this project, which should suitable for most use cases.

$ reddel --help
Usage: reddel [OPTIONS]

Options:
  --address TEXT       address to bind the server to
  --port INTEGER       address to bind the server to
  -p, --provider TEXT  dotted path to a provider class
  -v, --verbosity LVL  Either CRITICAL, ERROR, WARNING, INFO or DEBUG
  --debug              Show tracebacks when erroring.
  --help               Show this message and exit.

--address TEXT	Default is localhost. Can be an IP or domain name.
--port INTEGER	Defaults to a random free port.
-p, --provider TEXT	Example: mypkg.mymod.MyProviderClass You can provide this multiple times. Defines additional providers that are available from the start. More providers can be added at runtime via reddel_server.ChainedProvider.add_provider.
-v, --verbosity LVL	Define the logging level.
--debug	By default all expected exceptions are only logged without the traceback. If this flag is set, the traceback is printed as well.
--help	Show the help message and exit.

Calling a function from within Emacs is very simple thanks to epc:

>>> (progn
...   (require 'epc)
...   (defvar my-epc (epc:start-epc "reddel" nil))
...   ;; list all methods compatible with the given source
...   (message (epc:call-sync my-epc 'list_methods '("def foo(arg1, arg3): pass"))))

(epc:start-epc "reddel" nil) starts the server by executing reddel without any arguments (nil). Then you can make calls to that server by referring to the manager returned from epc:start-epc. To execute a call, you can use (epc:call-sync <manager> <method> <arguments>), where <manager> is the manager returned by epc:start-epc, <method> is the function and <arguments> is a list of arguments passed to <method>.

The Builtin Functions section in the documentation provides a guide through all functions that ship with this package. If you need advanced features check the reference documentation for help on how to write your own server.

Documentation

https://reddel-server.readthedocs.io/

Bugs/Requests

Please use the GitHub issue tracker to submit bugs or request features.

Development

To run the all tests run:

tox

Note, to combine the coverage data from all the tox environments run:

Windows	set PYTEST_ADDOPTS=--cov-append tox
Other	PYTEST_ADDOPTS=--cov-append tox

License

Copyright David Zuber, 2016.

Distributed under the terms of the GNU General Public License version 3, reddel-server is free and open source software.

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