change from mono-home-manager to full flake multi-system configuration

home/obsidian.nix

@@ -0,0 +1,60 @@
+{ config, pkgs, lib, ... }:
+
+let
+  vaultName = "main";
+  notesDir = "${config.home.homeDirectory}/Obsidian";
+  vaultDir = "${notesDir}/${vaultName}";
+  plugins = [
+    "calendar"
+    "advanced-tables"
+    "dataview"
+    "markdown-formatting-assistant"
+  ];
+  pluginDir = "${vaultDir}/.obsidian/plugins";
+  setupPlugins = pkgs.writeShellScriptBin "setup-obsidian-plugins" ''
+    set -e
+    mkdir -p "${pluginDir}"
+    cd "${pluginDir}"
+
+    ${lib.concatMapStringsSep "\n" (plugin:
+      ''
+        if [ ! -d "${plugin}" ]; then
+          echo "Installing plugin: ${plugin}"
+          git clone --depth=1 https://github.com/obsidianmd/obsidian-releases/tree/master/community-plugins/${plugin} ${plugin} || true
+        fi
+      ''
+    ) plugins}
+  '';
+  cfg = config.homeModules.obsidian;
+in
+
+lib.mkIf cfg.enable {
+  home.packages = with pkgs; [
+    obsidian
+    setupPlugins
+  ];
+
+  # Ensure Notes and vault directory exist
+  home.file."Obsidian/.keep".text = "";
+
+  # Shell alias
+  programs.zsh.shellAliases = {
+    obsidian = "obsidian ${vaultDir}";
+  };
+
+  # Obsidian desktop entry
+  xdg.desktopEntries.obsidian = {
+    name = "Obsidian";
+    genericName = "Markdown Notes";
+    comment = "A powerful knowledge base with Markdown and local storage.";
+    exec = "obsidian ${vaultDir}";
+    icon = "obsidian";
+    type = "Application";
+    categories = [ "Office" "TextEditor" "Utility" ];
+  };
+
+  # Reminder to run plugin setup
+  home.activation.obsidianPluginSetup = lib.hm.dag.entryAfter ["writeBoundary"] ''
+    echo "💡 Run 'setup-obsidian-plugins' to install default plugins into ${pluginDir}"
+  '';
+}