Add file contents Neovim lua

To set (replace) a range of text in a given buffer, use nvim_buf_set_text.

However, if you need to set several lines at once, prefer using nvim_buf_set_lines

If you're only adding / appending contents, prefer using nvim_put

vim.api.nvim_put() takes in 4 arguments:

a list of lines (strings) to insert
the edit behaviour, "b" | "c" | "l" | "" (see the docs for this one)
a boolean, if true will insert text after the cursor (false will insert before)
a boolean, if true, the cursor will follow the inserted text

lua

vim.cmd.edit("cool-file.md")
vim.api.nvim_put(
    { "hey", "hi", "howdy" },
    "l",
    true,
    true
)

Add file contents Neovim lua ​