feat: presence

shard.lock

@@ -1,5 +1,9 @@
 version: 2.0
 shards:
+  blank:
+    git: https://github.com/kostya/blank.git
+    version: 0.2.0
+
   db:
     git: https://github.com/crystal-lang/crystal-db.git
     version: 0.11.0

shard.yml

@@ -12,3 +12,5 @@ dependencies:
     github: "will/crystal-pg"
   sqlite3:
     github: "crystal-lang/crystal-sqlite3"
+  blank:
+    github: "kostya/blank"

src/presence.cr

@@ -0,0 +1,9 @@
+require "blank"
+
+class Object
+  def presence
+    return nil if blank?
+
+    self
+  end
+end