Add diff support even when not running in check mode

plugins/modules/aur.py

@@ -262,6 +262,11 @@ def install_packages(module, packages, use, extra_args, state, skip_pgp_check, i
     """
     Install the specified packages
     """
+    diff = {
+        'before': '',
+        'after': '',
+    }
+
     if local_pkgbuild:
         assert use in use_cmd_local_pkgbuild
     else:
@@ -270,10 +275,12 @@ def install_packages(module, packages, use, extra_args, state, skip_pgp_check, i
     changed_iter = False
 
     for package in packages:
-        if state == 'present':
-            if package_installed(module, package):
-                rc = 0
-                continue
+        already_installed = package_installed(module, package)
+        if state == 'present' and already_installed:
+            rc = 0
+            continue
+        if module._diff and not already_installed:
+            diff['after'] += package + "\n"
         if use == 'makepkg':
             rc, out, err = install_with_makepkg(module, package, extra_args, skip_pgp_check, ignore_arch, local_pkgbuild)
         elif local_pkgbuild:
@@ -292,6 +299,7 @@ def install_packages(module, packages, use, extra_args, state, skip_pgp_check, i
         msg=message if not rc else err,
         helper=use,
         rc=rc,
+        diff=diff,
     )