Automatically Execute Anything In Nvim - TJ DeVries (11min)

Get the Neovim buffer number for the current window with:

:echo nvim_get_current_buf()

The primary way to set lines in buffers is

local bufnr = 41 vim.api.nvim_buf_set_lines(bufnr, 0, -1, false {"hello", "world" })

Where "bufnr" is the buffer number. "0" is the start line and "-1" is the last line, false just needs to be there, and the last thing are the lines too put in.

to add something at the start of the file (and push everything else after it) use "0" instead of "-1" for the third parameter:

vim.api.nvim_buf_set_lines(bufnr, 0, 0, false {"hello", "world" })

Auto commands are how to react to events in Neovim.

BurWritePost is what is triggered after a buffer is written. (Looking at this for auto executing embedded rust scripts)

This is what a basic setup for an autocommand looks like (note that I typed this in so there may be typos that I haven't caught yet)

vim.api.nvim_create_autocmd("BufWritePost", { group = vim.api.nvim_create_augroup("TutorailGroup", { clear = true }), pattern = "main.txt", callback = function() print("did the thing") end, })

without `pattern`` in there, that would execute on every file save

Using the `.nvim_create_augroup()`` prevents listeners from being added over and over again when you same the lua source files that contain them

Running external commands is done with `.jobstart()``

(note: I typed this code in by hand and don't have a way setup to test it yet so it still needs to be vetted)

vim.fn.jobstart( {"go", "run", "main.go"}, { stdout_buffered = true, on_stdout = function(_, data) if data then vim.api.nvim_buf_set_lines(bufnr, -1, -1, false, data) end end, on_stderr = function(_, data) if data then vim.api.nvim_buf_set_lines(bufnr, -1, -1, false, data) end end } )