neovim: add extended obsidian plugin module

outputs/pkgs/ook-vim/modules/plugins/obsidian/obsidian.nix

@@ -0,0 +1,90 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  inherit (lib.options) mkOption mkEnableOption;
+  inherit (lib.types) str nullOr bool enum;
+  inherit (lib.nvim.binds) mkMappingOption;
+  inherit (lib.nvim.types) mkPluginSetupOption;
+in {
+  options.vim.notes.obsidianExtended = {
+    enable = mkEnableOption "Complementary neovim plugin for Obsidian editor";
+    setupOpts = mkPluginSetupOption "Obsidian.nvim" {
+      dir = mkOption {
+        type = str;
+        default = "~/my-vault";
+        description = "Location of Obsidian vault directory";
+      };
+      daily_notes = {
+        folder = mkOption {
+          type = nullOr str;
+          default = null;
+          description = "Directory in which daily notes should be created";
+        };
+        date_format = mkOption {
+          type = nullOr str;
+          default = null;
+          description = "Date format used for creating daily notes";
+        };
+      };
+      completion = {
+        nvim_cmp = mkOption {
+          # If using nvim-cmp, otherwise set to false
+          type = bool;
+          description = "If using nvim-cmp, otherwise set to false";
+          default = config.vim.autocomplete.nvim-cmp.enable;
+        };
+      };
+      new_notes_location = mkOption {
+        type = nullOr (enum ["current_dir" "notes_subdir"]);
+        default = null;
+        description = ''
+          Where to put new notes. Valid options are:
+          * "current_dir" - put notes in same directory as current buffer
+          * "notes_subdir" - put notes in the default notes subdirectory
+
+          default option: "current_dir"
+        '';
+      };
+      templates = {
+        folder = mkOption {
+          type = nullOr str;
+          default = null;
+          description = "Obsidian templates directory";
+        };
+        date_format = mkOption {
+          type = nullOr str;
+          default = null;
+          description = "Date format used for templates";
+        };
+        time_format = mkOption {
+          type = nullOr str;
+          default = null;
+          description = "Time format used for templates";
+        };
+      };
+      preferred_link_style = mkOption {
+        type = nullOr (enum ["wiki" "markdown"]);
+        default = null;
+        description = ''
+          Either "wiki" or "markdown"
+        '';
+      };
+      ui = {
+        enable = mkOption {
+          type = nullOr bool;
+          default = null;
+          description = ''
+            Set to false to disable all additional syntax features
+          '';
+        };
+        # TODO: add rest of ui options
+      };
+    };
+    mappings = {
+      openNote = mkMappingOption "Open note in obsidian" "<leader>oo";
+      findNote = mkMappingOption "Open finder in obsidian vault" "<leader>of";
+    };
+  };
+}