Alban Crequy wrote:
> I would like to have a support for D-Bus [1] in vim, and then be able
> to write vim plug-ins that use the vim D-Bus connection to communicate
> with external applications. My goal [2] is to be able to control the vim
> buffer from other applications to enable collaboration features (as
> Gobby does) between different editors (vim, emacs) using the same
> D-Bus protocol.
>
> I don't know the vim code, but with help from the #vim IRC channel, I
> wrote a vim plug-in in python [3] that fires a D-Bus signal each time
> the vim buffer is changed. It seems possible to inform external
> applications of each change of the vim buffer.
>
> I want also my plug-in to receive to D-Bus methods, so that external
> applications can change the content of the vim buffer. However, I am
> unable to do that with my plug-in because of the way the D-Bus
> connection is implemented in my plug-in.
>
> The D-Bus connection is an Unix socket. When vim fires a signal from the
> plug-in, some data is sent through the socket to the dbus-daemon
> process. But to receive D-Bus signal, the socket file descriptor must
> be added somehow in the vim main loop in order to call a function to
> read on the socket and I have no idea how to do that from a vim plug-in
> in Python. It may not be possible to do it from a Python plug-in without
> modifying the vim code.
>
> It seems that this "mainloop" problem is not specific to D-Bus but other
> projects has the same problem:
>
> - Clewn [4]: GDB support in vim. Clewn is an external program but need
> a patch in vim to work.
> - Slim-Vim [5]: Vim interface to SLIME, the project is abandoned. It
> needed a way to add a socket connection.
> - Eclim [6]: Eclipse integration in Vim: Vim instances communicate with
> Eclipse through the Eclim interface.
> - Vim client-server communication [7]
>
> The problem is, there is a lot of different projects, I don't know where
> to start looking :)
>
> Can you explain me the place in the vim code where the main loop is
> implemented? Should I look at some of the above projects or other ones?
There are two ways. Netbeans hooks itself into the GUI input. See
src/netbeans.c. The other way is adding something to the select() call.
This is in RealWaitForChar() in os_unix.c. Search for FEAT_MOUSE_GPM to
see an example.
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