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Program Emacs in Python instead of ELisp (i.e. write dynamic modules for Emacs in Python)

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emacspy

emacspy enables you to program Emacs in Python instead of ELisp. It works by using dynamic modules support introduced in Emacs 25.

Building and loading

Install Cython (pip install cython) and run make. emacspy.so will appear in the current directory. Make sure your Emacs build has loadable modules support enabled (default builds on some distributions don't!):

emacs --help | grep -q module-assertions && echo OK || echo "No loadable modules support"

You can load the module using normal load directive:

(add-to-list 'load-path "~/emacspy")
(load "~/emacspy/emacspy")

The module will expose two ELisp functions eval-python and exec-python.

(eval-python "4+4")

You can use exec-python to load you Python files:

(exec-python "import sys; sys.path.append('/home/user/my-files')")
(exec-python "import mymodule")

Python

Emacspy also exposes Python API for interacting with Emacs. To use it import emacspy module.

import emacspy

# use emacspy.v to access Emacs variables
emacspy.v.tab_width

# use emacspy.f to call Emacs functions
emacspy.f.message("hello")

# returned values are wrapped in EmacsValue
emacspy.f["+"](1, 2) # => <EmacsValue ...>

# use functions to convert to Python values
emacspy.f["+"](1, 2).int()
emacspy.v.page_delimiter.str()

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Program Emacs in Python instead of ELisp (i.e. write dynamic modules for Emacs in Python)

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