Exposed Autocommands

AstroNvim has many internally built features to help ease both user experience and configuration. Some of these features work asynchronously, so we provide a few User autocommand events that can be accessed by the user. All of the autocommand events that we provide are in the User autocommand space and the patterns begin with Astro. Here is a complete list of all of the events that we provide as well as descriptions on when they happen. For a list of the core Neovim autocmd events, check the help page with :h autocmd-events.

• AstroBufsUpdated: AstroNvim uses a vim-tab local variable for managing buffers displayed in our custom tabline. This is stored in vim.t.bufs. AstroBufsUpdated is triggered every time we update this vim.t.bufs variable internally.

• AstroColorScheme: The highlights configuration option in the user configuration provides an easy to use API for customizing highlight groups for all themes or specific themes even if the theme plugins do not provide good configuration APIs. AstroColorScheme is triggered after we finish applying these custom highlights when a new colorscheme is applied.

• AstroFile: AstroNvim uses this autocmd event for lazy loading plugins on the first real file opened for editing. This can also be used by the user. This event fires every time a file is opened with a non-empty filename.

• AstroGitFile: AstroNvim uses this autocmd event for lazy loading git related plugins. This event fires every time a file is opened that is in a git tracked directory.

• AstroLspSetup: AstroNvim has a lot of internal tooling surrounding setting up handlers for the internal LSP mechanisms. AstroLspSetup is triggered when we have finished setting up these handlers and configuring lspconfig.

• AstroMasonUpdateCompleted: AstroNvim provides a custom command for easily updating all packages that are currently installed with Mason using :MasonUpdateAll. AstroMasonUpdateCompleted is triggered after all of the available updates have been applied.

• AstroUpdateComplete: This is triggered once the AstroNvim updater has completed the update process. This could be useful for automatically quitting the editor after an update to quickly relaunch.

Example Autocommand Usage

Just to demonstrate the usage of User autocommand events in Neovim here is an example autocmd that disables the tabline if there is only a single buffer and a single tab available. The following can be placed in the polish function in a user configuration:

-- create an augroup to easily manage autocommands
vim.api.nvim_create_augroup("autohidetabline", { clear = true })
-- create a new autocmd on the "User" event
vim.api.nvim_create_autocmd("User", {
  desc = "Hide tabline when only one buffer and one tab", -- nice description
  -- triggered when vim.t.bufs is updated
  pattern = "AstroBufsUpdated", -- the pattern is the name of our User autocommand events
  group = "autohidetabline", -- add the autocmd to the newly created augroup
  callback = function()
    -- if there is more than one buffer in the tab, show the tabline
    -- if there are 0 or 1 buffers in the tab, only show the tabline if there is more than one vim tab
    local new_showtabline = #vim.t.bufs > 1 and 2 or 1
    -- check if the new value is the same as the current value
    if new_showtabline ~= vim.opt.showtabline:get() then
      -- if it is different, then set the new `showtabline` value
      vim.opt.showtabline = new_showtabline
    end
  end,
})