visuals: move cellular-automaton to its own module

Scuffed impl.

modules/plugins/visuals/cellular-automaton/cellular-automaton.nix

@@ -0,0 +1,60 @@
+{lib, ...}: let
+  inherit (lib.modules) mkRenamedOptionModule;
+  inherit (lib.options) mkOption mkEnableOption;
+  inherit (lib.nvim.types) luaInline;
+  inherit (lib.nvim.binds) mkMappingOption;
+  inherit (lib.generators) mkLuaInline;
+in {
+  imports = [
+    (mkRenamedOptionModule ["vim" "visuals" "cellularAutomaton"] ["vim" "visuals" "cellular-automaton"])
+  ];
+
+  options.vim.visuals.cellular-automaton = {
+    enable = mkEnableOption "cellular-automaton to help you cope with stubborn code [cellular-automaton]";
+
+    mappings = {
+      makeItRain = mkMappingOption "Make it rain [cellular-automaton]" "<leader>fml";
+    };
+
+    animation = {
+      register = mkEnableOption "registering configured animation(s) automatically" // {default = true;};
+      setup = mkOption {
+        type = luaInline;
+        default = mkLuaInline ''
+          local ca_config = {
+            fps = 50,
+            name = 'slide',
+          }
+
+          -- init function is invoked only once at the start
+          -- config.init = function (grid)
+          --
+          -- end
+
+          -- update function
+          ca_config.update = function (grid)
+          for i = 1, #grid do
+            local prev = grid[i][#(grid[i])]
+              for j = 1, #(grid[i]) do
+                grid[i][j], prev = prev, grid[i][j]
+              end
+            end
+            return true
+          end
+        '';
+        description = ''
+          Configuration used to generate an animation to be registered.
+
+          The final value for `ca_config` will be used to register a new
+          animation using `require("cellular-automaton").register_animation(ca_config)`
+
+          ::: {.warning}
+            `ca_config` **must** eval to a valid Lua table. nvf does not and cannot
+            perform any kind of validation on your Lua code, so bogus values will
+            result in errors when the animation is registered.
+          :::
+        '';
+      };
+    };
+  };
+}

modules/plugins/visuals/cellular-automaton/config.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib.modules) mkIf;
+  inherit (lib.strings) optionalString;
+  inherit (lib.nvim.lua) toLuaObject;
+  inherit (lib.nvim.dag) entryAnywhere entryAfter;
+  inherit (lib.nvim.binds) mkBinding;
+
+  cfg = config.vim.visuals.cellular-automaton;
+in {
+  config = mkIf cfg.enable {
+    vim = {
+      startPlugins = ["cellular-automaton"];
+
+      maps.normal = mkBinding cfg.mappings.makeItRain "<cmd>CellularAutomaton make_it_rain<CR>" "Make it rain";
+
+      pluginRC = {
+        # XXX: This has no error handling. User can set
+        # `animation.setup` to a bogus value, and we would
+        # have an error in our hands. I don't think there
+        # is a good way to check for errors, so I'm leaving
+        # it like this under the assumption that the user
+        # will not mess it up for no reason.
+        cellular-automaton-anim = entryAnywhere (optionalString cfg.animation.register ''
+          -- Coerce user animation config into pluginRC
+          ${toLuaObject cfg.animation.setup}
+        '');
+
+        cellular-automaton = entryAfter ["cellular-automaton-anim"] ''
+          -- Register the animation
+          require("cellular-automaton").register_animation(ca_config)
+        '';
+      };
+    };
+  };
+}

modules/plugins/visuals/cellular-automaton/default.nix

@@ -0,0 +1,6 @@
+{
+  imports = [
+    ./config.nix
+    ./cellular-automaton.nix
+  ];
+}

modules/plugins/visuals/config.nix

@@ -19,37 +19,6 @@ in {
       '';
     })
 
-    (mkIf cfg.cellularAutomaton.enable {
-      vim.startPlugins = ["cellular-automaton"];
-
-      vim.maps.normal = mkBinding cfg.cellularAutomaton.mappings.makeItRain "<cmd>CellularAutomaton make_it_rain<CR>" "Make it rain";
-
-      vim.pluginRC.cellularAUtomaton = entryAnywhere ''
-        local config = {
-              fps = 50,
-              name = 'slide',
-            }
-
-            -- init function is invoked only once at the start
-            -- config.init = function (grid)
-            --
-            -- end
-
-            -- update function
-            config.update = function (grid)
-            for i = 1, #grid do
-              local prev = grid[i][#(grid[i])]
-                for j = 1, #(grid[i]) do
-                  grid[i][j], prev = prev, grid[i][j]
-                end
-              end
-              return true
-            end
-
-            require("cellular-automaton").register_animation(config)
-      '';
-    })
-
     (mkIf cfg.highlight-undo.enable {
       vim.startPlugins = ["highlight-undo"];
       vim.pluginRC.highlight-undo = entryAnywhere ''

modules/plugins/visuals/default.nix

@@ -1,5 +1,6 @@
 {
   imports = [
+    ./cellular-automaton
     ./cinnamon-nvim
     ./fidget-nvim
     ./indent-blankline

modules/plugins/visuals/visuals.nix

@@ -5,21 +5,12 @@
 }: let
   inherit (lib.options) mkEnableOption mkOption;
   inherit (lib.types) int bool str;
-  inherit (lib.nvim.binds) mkMappingOption;
 
   cfg = config.vim.visuals;
 in {
   options.vim.visuals = {
     enable = mkEnableOption "Visual enhancements.";
 
-    cellularAutomaton = {
-      enable = mkEnableOption "cellular automaton [cellular-automaton]";
-
-      mappings = {
-        makeItRain = mkMappingOption "Make it rain [cellular-automaton]" "<leader>fml";
-      };
-    };
-
     highlight-undo = {
       enable = mkEnableOption "highlight undo [highlight-undo]";