I'm very exited with neovim, it's possible the version 0.5 to be released this month.
and also I want to cooperate with a new feature on the vista plugin

today I was working recreating this exercise
https://dev.to/2nit/how-to-write-neovim-plugins-in-lua-5cca

My repo: https://github.com/roberbnd/nvim-git-files-commit

Resume

using require'VALUE'.gitFilesCommit(): VALUE has to be the same name as it has the file .lua
- File plugin/nvim-git-files-commit.vim:10

Learned functions under vim.api
https://neovim.io/doc/user/api.html

nvim_call_function
nvim_command
nvim_create_buf
nvim_buf_add_highlight
nvim_buf_set_keymap
nvim_buf_set_lines
nvim_buf_set_option
nvim_get_current_line
nvim_get_option
nvim_open_win
nvim_win_close
nvim_win_get_cursor
nvim_win_get_width
nvim_win_set_cursor
nvim_win_set_option