posts: add metatags for approving and banning posts.

* Allow approvers to approve a post by tagging it with status:active.
* Allow approvers to ban a post by tagging it with status:banned.
* Allow approvers to unban a post by tagging it with -status:banned.

app/models/post.rb

@@ -753,7 +753,7 @@ class Post < ApplicationRecord
     def filter_metatags(tags)
       @pre_metatags, tags = tags.partition {|x| x =~ /\A(?:rating|parent|-parent|-?locked):/i}
       tags = apply_categorization_metatags(tags)
-      @post_metatags, tags = tags.partition {|x| x =~ /\A(?:-pool|pool|newpool|fav|-fav|child|-child|-favgroup|favgroup|upvote|downvote):/i}
+      @post_metatags, tags = tags.partition {|x| x =~ /\A(?:-pool|pool|newpool|fav|-fav|child|-child|-favgroup|favgroup|upvote|downvote|status|-status):/i}
       apply_pre_metatags
       return tags
     end
@@ -803,6 +803,18 @@ class Post < ApplicationRecord
         when /^(up|down)vote:(.+)$/i
           vote!($1)
 
+        when /^status:active$/i
+          raise User::PrivilegeError unless CurrentUser.is_approver?
+          approvals.create!(user: CurrentUser.user)
+
+        when /^status:banned$/i
+          raise User::PrivilegeError unless CurrentUser.is_approver?
+          ban!
+
+        when /^-status:banned$/i
+          raise User::PrivilegeError unless CurrentUser.is_approver?
+          unban!
+
         when /^child:none$/i
           children.each do |post|
             post.update!(parent_id: nil)

test/unit/post_test.rb

@@ -998,6 +998,64 @@ class PostTest < ActiveSupport::TestCase
           end
         end
 
+        context "for status:active" do
+          should "approve the post if the user has permission" do
+            as(create(:approver)) do
+              @post.update!(is_pending: true)
+              @post.update(tag_string: "aaa status:active")
+            end
+
+            assert_equal(false, @post.reload.is_pending?)
+          end
+
+          should "not approve the post if the user is doesn't have permission" do
+            assert_raises(User::PrivilegeError) do
+              @post.update!(is_pending: true)
+              @post.update(tag_string: "aaa status:active")
+            end
+
+            assert_equal(true, @post.reload.is_pending?)
+          end
+        end
+
+        context "for status:banned" do
+          should "ban the post if the user has permission" do
+            as(create(:approver)) do
+              @post.update(tag_string: "aaa status:banned")
+            end
+
+            assert_equal(true, @post.reload.is_banned?)
+          end
+
+          should "not ban the post if the user doesn't have permission" do
+            assert_raises(User::PrivilegeError) do
+              @post.update(tag_string: "aaa status:banned")
+            end
+
+            assert_equal(false, @post.reload.is_banned?)
+          end
+        end
+
+        context "for -status:banned" do
+          should "unban the post if the user has permission" do
+            as(create(:approver)) do
+              @post.update!(is_banned: true)
+              @post.update(tag_string: "aaa -status:banned")
+            end
+
+            assert_equal(false, @post.reload.is_banned?)
+          end
+
+          should "not unban the post if the user doesn't have permission" do
+            assert_raises(User::PrivilegeError) do
+              @post.update!(is_banned: true)
+              @post.update(tag_string: "aaa status:banned")
+            end
+
+            assert_equal(true, @post.reload.is_banned?)
+          end
+        end
+
         context "for a source" do
           should "set the source with source:foo_bar_baz" do
             @post.update(:tag_string => "source:foo_bar_baz")