vim_bridge - a Python-to-Vim bridge
What is it?
vim_bridge is a Python-to-Vim bridge decorator that allows transparent calls to Python functions in native Vim scripts.
Simply install the vim_bridge Python package, using setuptools,
In a Vim script, decorate your Python functions as follows to expose them as native Vim callables. Both arguments and return values are casted so it should be transparent:
python << endpython from vim_bridge import bridged @bridged def SayHello(first, last): return "Hello, %s %s!" % (first, last) endpython " Now call directly into the Python function! echo SayHello("John", "Doe") " prints "Hello, John Doe!"
The following data types have proven to work:
Passing in a list:
python << endpython from vim_bridge import bridged @bridged def GetLongest(list): return max(map(lambda s: len(s), list)) endpython echo GetLongest(['one', 'two', 'three', 'four']) " returns 5 (because "three" is 5 chars long)
python << endpython from vim_bridge import bridged @bridged def WillCauseException(): raise Exception("Oops") endpython " This will throw an error to the user... echo WillCauseException() " But here's how you can catch that in Vim try echo WillCauseException() catch echo "Something went wrong. Aborting." finally echo "Cleaning up." endtry
Using Python stdlib functions to do work that would be more difficult using pure Vim scripting:
python << END import os.path from vim_bridge import bridged @bridged def NormalizePath(path): return os.path.realpath(path) END echo NormalizePath("/this/../or/./.././that/is/./a/.//very/../obscure/..//././long/./../path/name") echo NormalizePath("..")
You can use the bridged function definitions within a Python block itself, or from inside Vim, it does not matter. In this example, NormalizePath is called from both Python and Vim:
python << END import os.path from vim_bridge import bridged @bridged def NormalizePath(path): return os.path.realpath(path) @bridged def RealPath(path): # It does not matter if you call NormalizePath from here... return NormalizePath(path) END " ...or from here echo NormalizePath("/this/../or/./.././that/is/./a/.//very/../obscure/..//././long/./../path/name") echo RealPath("..")
Since vim_bridge 0.4, the function name casing convention is automatically
converted to match Vim's conventions (and requirement even, since function
names must start with a capital letter). Besides casing, prefixing the
Python function with an underscore will lead to the function being defined in
the Vim context as a
<SID>-prefixed function (i.e. a "private" function
that cannot be called from outside the script):
python << eop import os import vim from vim_bridge import bridged @bridged def public(): return "I am public." @bridged def _private(): return "I am private (available in the current script only)." @bridged def my_name_is_auto_converted(): return "In Python, I'm called my_name_is_auto_converted, " + \ "but in Vim, I'm called MyNameIsAutoConverted :)" @bridged def _long_private_name(): return "I'm private, and my case is converted automatically." eop echo Public() echo s:Private() echo MyNameIsAutoConverted() echo s:LongPrivateName()