libnvc

I realize nvim now provides libnvim.a, this repo may not be needed anymore.

another c++-20 nvim msgpack-rpc client, nvim-0.5.0 tested.
nvim's rpc interface is convenient but not something you can finish in 10 minutes.
this repo creates libnvc.a and you can use it to read/write a process running neovim easily.

start nvim and use asio_socket to talk to it:

#include "libnvc.hpp"

int main()
{
    // start nvim:
    // $ nvim --listen "127.0.0.1:6666"
    libnvc::asio_socket socket;
    if(!socket.connect("localhost", 6666)){
        throw std::runtime_error("failed to connect to localhost:6666");
    }

    libnvc::api_client client(&socket);
    client.nvim_input("$i123<CR>123<ESC>");
    client.nvim_buf_set_name(1, "1234");

or use reproc_device to spawn a process running nvim in background:

#include "libnvc.hpp"

int main()
{
    // spawn nvim process with default parameters
    libnvc::reproc_device reproc_dev;
    reproc_dev.spawn();

    libnvc::api_client client(&reproc_dev);
    client.nvim_ui_attach(100, 80, {{"rgb", true}, {"ext_linegrid", true}});
    client.nvim_input("$i123<CR>123<ESC>");
    client.nvim_buf_set_name(1, "1234");

build

there is zero dependenct for user's building environment.
libnvc use asio, mpack and reproc internally but hiden by pimpl.

# build the libnvc library, nvim should be in your PATH
$ cd $HOME
$ git clone https://github.com/etorth/libnvc.git
$ mkdir b_libnvc && cd b_libnvc
$ cmake ../libnvc -DCMAKE_INSTALL_PREFIX=install -DCMAKE_C_COMPILER=gcc-11 -DCMAKE_CXX_COMPILER=g++-11
$ make && make install

# build the sample project, a simple nvim gui
# this requires SDL2, SDL2-image and SDL2-ttf installed
$ cd $HOME
$ mkdir b_nvim_sdl2 && cd b_nvim_sdl2
$ cmake ../libnvc/sample/nvim_sdl2 -DCMAKE_INSTALL_PREFIX=install -DLIBNVC_INCLUDE=$HOME/b_libnvc/install/include -DLIBNVC_LIB=$HOME/b_libnvc/install/lib
$ make && make install

# run the sample gui
$ cd $HOME/b_nvim_sdl2/install/nvim_sdl2 && ./nvim_sdl2