modules/autocmd: factor out autocmd-helpers

lib/autocmd-helpers.nix

@@ -0,0 +1,79 @@
+{lib, ...}:
+with lib; let
+  helpers = import ../lib/helpers.nix {inherit lib;};
+in rec {
+  autoGroupOption = types.submodule {
+    options = {
+      clear = mkOption {
+        type = types.bool;
+        description = "Clear existing commands if the group already exists.";
+        default = true;
+      };
+    };
+  };
+
+  autoCmdOptions = {
+    event = helpers.mkNullOrOption (with types; either str (listOf str)) ''
+      The event or events to register this autocommand.
+    '';
+
+    group = helpers.mkNullOrOption (with types; either str int) ''
+      The autocommand group name or id to match against.
+    '';
+
+    pattern = helpers.mkNullOrOption (with types; either str (listOf str)) ''
+      Pattern or patterns to match literally against.
+    '';
+
+    buffer = helpers.mkNullOrOption types.int ''
+      Buffer number for buffer local autocommands |autocmd-buflocal|.
+      Cannot be used with `pattern`.
+    '';
+
+    # Introduced early October 2023.
+    # TODO remove in early December 2023.
+    description = helpers.mkNullOrOption types.str ''
+      DEPRECATED, please use `desc`.
+    '';
+
+    desc = helpers.mkNullOrOption types.str ''
+      A textual description of this autocommand.
+    '';
+
+    callback = helpers.mkNullOrOption (with types; either str helpers.rawType) ''
+      A function or a string.
+      - if a string, the name of a Vimscript function to call when this autocommand is triggered.
+      - Otherwise, a Lua function which is called when this autocommand is triggered.
+        Cannot be used with `command`.
+        Lua callbacks can return true to delete the autocommand; in addition, they accept a single
+        table argument with the following keys:
+        - id: (number) the autocommand id
+        - event: (string) the name of the event that triggered the autocommand |autocmd-events|
+        - group: (number|nil) the autocommand group id, if it exists
+        - match: (string) the expanded value of |<amatch>|
+        - buf: (number) the expanded value of |<abuf>|
+        - file: (string) the expanded value of |<afile>|
+        - data: (any) arbitrary data passed to |nvim_exec_autocmds()|
+
+      Example using callback:
+      autoCmd = [
+        {
+          event = [ "BufEnter" "BufWinEnter" ];
+          pattern = [ "*.c" "*.h" ];
+          callback = { __raw = "function() print('This buffer enters') end"; };
+        }
+    '';
+
+    command = helpers.defaultNullOpts.mkStr "" ''
+      Vim command to execute on event. Cannot be used with `callback`.
+    '';
+
+    once = helpers.defaultNullOpts.mkBool false "Run the autocommand only once.";
+
+    nested = helpers.defaultNullOpts.mkBool false "Run nested autocommands.";
+  };
+
+  autoCmdOption = types.submodule {
+    options = autoCmdOptions;
+  };
+}

lib/helpers.nix

@@ -1,6 +1,7 @@
 {lib, ...}:
 with lib; rec {
   keymaps = import ./keymap-helpers.nix {inherit lib;};
+  autocmd = import ./autocmd-helpers.nix {inherit lib;};
 
   # vim dictionaries are, in theory, compatible with JSON
   toVimDict = args:

modules/autocmd.nix

@@ -4,83 +4,10 @@
   config,
   ...
 }:
-with lib; let
-  autoGroupOption = types.submodule {
-    options = {
-      clear = mkOption {
-        type = types.bool;
-        description = "Clear existing commands if the group already exists.";
-        default = true;
-      };
-    };
-  };
-
-  autoCmdOption = types.submodule {
-    options = {
-      event = helpers.mkNullOrOption (types.either types.str (types.listOf types.str)) ''
-        The event or events to register this autocommand.
-      '';
-
-      group = helpers.mkNullOrOption (types.either types.str types.int) ''
-        The autocommand group name or id to match against.
-      '';
-
-      pattern = helpers.mkNullOrOption (types.either types.str (types.listOf types.str)) ''
-        Pattern or patterns to match literally against.
-      '';
-
-      buffer = helpers.mkNullOrOption types.int ''
-        Buffer number for buffer local autocommands |autocmd-buflocal|.
-        Cannot be used with `pattern`.
-      '';
-
-      # Introduced early October 2023.
-      # TODO remove in early December 2023.
-      description = helpers.mkNullOrOption types.str ''
-        DEPRECATED, please use `desc`.
-      '';
-
-      desc = helpers.mkNullOrOption types.str ''
-        A textual description of this autocommand.
-      '';
-
-      callback = helpers.mkNullOrOption (types.either types.str helpers.rawType) ''
-        A function or a string.
-        - if a string, the name of a Vimscript function to call when this autocommand is triggered.
-        - Otherwise, a Lua function which is called when this autocommand is triggered.
-          Cannot be used with `command`.
-          Lua callbacks can return true to delete the autocommand; in addition, they accept a single
-          table argument with the following keys:
-          - id: (number) the autocommand id
-          - event: (string) the name of the event that triggered the autocommand |autocmd-events|
-          - group: (number|nil) the autocommand group id, if it exists
-          - match: (string) the expanded value of |<amatch>|
-          - buf: (number) the expanded value of |<abuf>|
-          - file: (string) the expanded value of |<afile>|
-          - data: (any) arbitrary data passed to |nvim_exec_autocmds()|
-
-        Example using callback:
-        autoCmd = [
-          {
-            event = [ "BufEnter" "BufWinEnter" ];
-            pattern = [ "*.c" "*.h" ];
-            callback = { __raw = "function() print('This buffer enters') end"; };
-          }
-      '';
-
-      command = helpers.defaultNullOpts.mkStr "" ''
-        Vim command to execute on event. Cannot be used with `callback`.
-      '';
-
-      once = helpers.defaultNullOpts.mkBool false "Run the autocommand only once.";
-
-      nested = helpers.defaultNullOpts.mkBool false "Run nested autocommands.";
-    };
-  };
-in {
+with lib; {
   options = {
     autoGroups = mkOption {
-      type = types.attrsOf autoGroupOption;
+      type = types.attrsOf helpers.autocmd.autoGroupOption;
       default = {};
       description = "augroup definitions";
       example = ''
@@ -93,7 +20,7 @@ in {
     };
 
     autoCmd = mkOption {
-      type = types.listOf autoCmdOption;
+      type = types.listOf helpers.autocmd.autoCmdOption;
       default = [];
       description = "autocmd definitions";
       example = ''