modules/calendar: add khal calendar to the modules

modules/home-manager/programs/calendar.nix

@@ -0,0 +1,18 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfg = config.local.programs.calendar;
+
+  mkCalOpts = name: {
+    enable = lib.mkEnableOption name;
+    package = lib.mkPackageOption pkgs name { };
+  };
+in
+{
+  options.local.programs.calendar = {
+    khal = mkCalOpts "khal";
+  };
+
+  config.home.packages =
+    lib.optional cfg.khal.enable cfg.khal.package;
+}

modules/home-manager/programs/default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ./aerc.nix
+    ./calendar.nix
     ./communication.nix
     ./dev-tools.nix
     ./flameshot.nix

modules/home-manager/programs/share-files.nix

@@ -2,19 +2,24 @@
 
 let
   cfg = config.local.programs.share-files;
+
+  mkShareFileOpts = name: {
+    enable = lib.mkEnableOption name;
+    package = lib.mkPackageOption pkgs name { };
+  };
 in
 {
-  options.local.programs.share-files = with lib; {
-    onionshare.enable = mkEnableOption "onionshare";
-    croc.enable = mkEnableOption "croc";
+  options.local.programs.share-files = {
+    onionshare.enable = mkShareFileOpts "onionshare-gui";
+    croc.enable = mkShareFileOpts "croc";
   };
 
   config.home.packages =
     # OnionShare is an open-source tool that lets you securely and anonymously share files,
     # host websites, and chat with friends using the Tor network.
-    lib.optional cfg.onionshare.enable pkgs.onionshare-gui
+    lib.optional cfg.onionshare.enable cfg.onionshare.package
 
     # Easily and securely send things from one computer to another
-    ++ lib.optional cfg.croc.enable pkgs.croc;
+    ++ lib.optional cfg.croc.enable cfg.croc.package;
 
 }