neovim command to copy selection as a code snippet, with filename, line number and then the code snippet

init.lua

-- Command to copy selection as a code snippet, with filename, line number and then the code snippet
vim.api.nvim_create_user_command("CopyCodeSnippet", function(opts)
  local start_line = vim.fn.line("'<") - 1
  local end_line = vim.fn.line("'>")
  local file_name = vim.fn.expand("%:.")
  local lines = vim.api.nvim_buf_get_lines(0, start_line, end_line, false)
  local file_type = vim.api.nvim_buf_get_option(0, "filetype")

  -- set clipboard
  vim.fn.setreg("*", file_name .. " +" .. (start_line + 1) .. "\n\n```" .. file_type .. "\n" .. table.concat(lines, "\n") .. "\n```")
  vim.notify("Added code snippet to clipboard", vim.log.levels.INFO)
end, { range = true, bang = true })

-- map it to F6 on visual mode
vim.api.nvim_set_keymap("v", "<F6>", ":CopyCodeSnippet<CR>", { noremap = true })