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119 lines
5.8 KiB
Markdown
119 lines
5.8 KiB
Markdown
# Autocommands and Autogroups {#ch-autocmds-augroups}
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This module allows you to declaratively configure Neovim autocommands and
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autogroups within your Nix configuration.
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## Autogroups (`vim.augroups`) {#sec-vim-augroups}
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Autogroups (`augroup`) organize related autocommands. This allows them to be
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managed collectively, such as clearing them all at once to prevent duplicates.
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Each entry in the list is a submodule with the following options:
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| Option | Type | Default | Description | Example |
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| :------- | :----- | :------ | :--------------------------------------------------------------------------------------------------- | :---------------- |
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| `enable` | `bool` | `true` | Enables or disables this autogroup definition. | `true` |
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| `name` | `str` | _None_ | **Required.** The unique name for the autogroup. | `"MyFormatGroup"` |
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| `clear` | `bool` | `true` | Clears any existing autocommands within this group before adding new ones defined in `vim.autocmds`. | `true` |
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**Example:**
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```nix
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{
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vim.augroups = [
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{
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name = "MyCustomAuGroup";
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clear = true; # Clear previous autocommands in this group on reload
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}
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{
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name = "Formatting";
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# clear defaults to true
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}
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];
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}
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```
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## Autocommands (`vim.autocmds`) {#sec-vim-autocmds}
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Autocommands (`autocmd`) trigger actions based on events happening within Neovim
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(e.g., saving a file, entering a buffer). Each entry in the list is a submodule
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with the following options:
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| Option | Type | Default | Description | Example |
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| :--------- | :-------------------- | :------ | :---------------------------------------------------------------------------------------------------------------------- | :----------------------------------------------------------------- |
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| `enable` | `bool` | `true` | Enables or disables this autocommand definition. | `true` |
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| `event` | `nullOr (listOf str)` | `null` | **Required.** List of Neovim events that trigger this autocommand (e.g., `BufWritePre`, `FileType`). | `[ "BufWritePre" ]` |
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| `pattern` | `nullOr (listOf str)` | `null` | List of file patterns (globs) to match against (e.g., `*.py`, `*`). If `null`, matches all files for the given event. | `[ "*.lua", "*.nix" ]` |
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| `callback` | `nullOr luaInline` | `null` | A Lua function to execute when the event triggers. Use `lib.generators.mkLuaInline`. **Cannot be used with `command`.** | `lib.generators.mkLuaInline "function() print('File saved!') end"` |
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| `command` | `nullOr str` | `null` | A Vimscript command to execute when the event triggers. **Cannot be used with `callback`.** | `"echo 'File saved!'"` |
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| `group` | `nullOr str` | `null` | The name of an `augroup` (defined in `vim.augroups`) to associate this autocommand with. | `"MyCustomAuGroup"` |
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| `desc` | `nullOr str` | `null` | A description for the autocommand (useful for introspection). | `"Format buffer on save"` |
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| `once` | `bool` | `false` | If `true`, the autocommand runs only once and then automatically removes itself. | `false` |
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| `nested` | `bool` | `false` | If `true`, allows this autocommand to trigger other autocommands. | `false` |
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:::{.warning}
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You cannot define both `callback` (for Lua functions) and `command` (for
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Vimscript) for the same autocommand. Choose one.
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:::
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**Examples:**
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```nix
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{ lib, ... }:
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{
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vim.augroups = [ { name = "UserSetup"; } ];
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vim.autocmds = [
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# Example 1: Using a Lua callback
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{
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event = [ "BufWritePost" ];
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pattern = [ "*.lua" ];
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group = "UserSetup";
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desc = "Notify after saving Lua file";
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callback = lib.generators.mkLuaInline ''
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function()
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vim.notify("Lua file saved!", vim.log.levels.INFO)
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end
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'';
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}
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# Example 2: Using a Vim command
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{
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event = [ "FileType" ];
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pattern = [ "markdown" ];
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group = "UserSetup";
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desc = "Set spellcheck for Markdown";
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command = "setlocal spell";
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}
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# Example 3: Autocommand without a specific group
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{
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event = [ "BufEnter" ];
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pattern = [ "*.log" ];
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desc = "Disable line numbers in log files";
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command = "setlocal nonumber";
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# No 'group' specified
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}
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# Example 4: Using Lua for callback
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{
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event = [ "BufWinEnter" ];
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pattern = [ "*" ];
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desc = "Simple greeting on entering a buffer window";
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callback = lib.generators.mkLuaInline ''
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function(args)
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print("Entered buffer: " .. args.buf)
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end
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'';
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# Run only once per session trigger
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once = true;
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}
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];
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}
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```
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These definitions are automatically translated into the necessary Lua code to
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configure `vim.api.nvim_create_augroup` and `vim.api.nvim_create_autocmd` when
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Neovim starts.
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