Extract pipe pattern

lib/mrsk/commands/app.rb

@@ -24,7 +24,7 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
   end
 
   def stop
-    [ "docker ps -q #{service_filter.join(" ")} | xargs docker stop" ]
+    pipe current_container_id, "xargs docker stop"
   end
 
   def info
@@ -32,9 +32,10 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
   end
 
   def logs(lines: 1000, grep: nil)
-    [ "docker ps -q #{service_filter.join(" ")} | xargs docker logs -n #{lines} -t" ].tap do |command|
-      command.first << " | grep #{grep}" if grep
-    end
+    pipe \
+      current_container_id,
+      "xargs docker logs -n #{lines} -t",
+      ("grep #{grep}" if grep)
   end
 
   def exec(*command, interactive: false)

lib/mrsk/commands/base.rb

@@ -11,10 +11,15 @@ module Mrsk::Commands
     end
 
     private
-      def combine(*commands)
+      def combine(*commands, by: "&&")
         commands
-          .collect { |command| command + [ "&&" ] }.flatten # Join commands with &&
-          .tap     { |commands| commands.pop } # Remove trailing &&
+          .compact
+          .collect { |command| Array(command) + [ by ] }.flatten # Join commands
+          .tap     { |commands| commands.pop } # Remove trailing combiner
+      end
+
+      def pipe(*commands)
+        combine *commands, by: "|"
       end
 
       def docker(*args)