Model callback enhancement

Allows cfg, cmd, pre, post and expect blocks to reset the callback array or change from push to unshift.

Use case is in custom models which monkey-patch the distribution model. You might want to replace for example distribution ```cmd :secret``` with your own version, like such:

cmd :secret clear: true do
  ...
end

Or if you instead want to unshift your block to be first to be called:

cfg :ssh do prepend: true do
  ..
end

Closes #1384 

1 files changed, 22 insertions, 11 deletions

diff --git a/lib/oxidized/model/model.rb b/lib/oxidized/model/model.rb
index 438357f..761e19e 100644
--- a/lib/oxidized/model/model.rb
+++ b/lib/oxidized/model/model.rb
@@ -24,9 +24,9 @@ module Oxidized
         @prompt or @prompt = _prompt
       end
 
-      def cfg *methods, &block
+      def cfg *methods, **args, &block
         [methods].flatten.each do |method|
-          @cfg[method.to_s] << block
+          process_args_block(@cfg[method.to_s], args, block)
         end
       end
 
@@ -34,11 +34,11 @@ module Oxidized
         @cfg
       end
 
-      def cmd _cmd = nil, &block
+      def cmd _cmd = nil, **args, &block
         if _cmd.class == Symbol
-          @cmd[_cmd] << block
+          process_args_block(@cmd[_cmd], args, block)
         else
-          @cmd[:cmd] << [_cmd, block]
+          process_args_block(@cmd[:cmd], args, [_cmd, block])
         end
         Oxidized.logger.debug "lib/oxidized/model/model.rb Added #{_cmd} to the commands list"
       end
@@ -47,8 +47,8 @@ module Oxidized
         @cmd
       end
 
-      def expect re, &block
-        @expect << [re, block]
+      def expect re, **args, &block
+        process_args_block(@expect, args, [re, block])
       end
 
       def expects
@@ -62,8 +62,8 @@ module Oxidized
       # @since 0.0.39
       # @yield expects block which should return [String]
       # @return [void]
-      def pre &block
-        @procs[:pre] << block
+      def pre **args, &block
+        process_args_block(@procs[:pre], args, block)
       end
 
       # calls the block at the end of the model, adding the output of the block
@@ -73,8 +73,8 @@ module Oxidized
       # @since 0.0.39
       # @yield expects block which should return [String]
       # @return [void]
-      def post &block
-        @procs[:post] << block
+      def post **args, &block
+        process_args_block(@procs[:post], args, block)
       end
 
       # @author Saku Ytti <saku@ytti.fi>
@@ -83,6 +83,17 @@ module Oxidized
       def procs
         @procs
       end
+
+      private
+
+      def process_args_block(target, args, block)
+        if args[:clear]
+          target.replace([block])
+        else
+          method = args[:prepend] ? :unshift : :push
+          target.send(method, block)
+        end
+      end
     end
 
     attr_accessor :input, :node