Implement CLI debug option

lib/producer/core/cli.rb

@@ -18,7 +18,10 @@ module Producer
             stderr.puts e.message
             exit EX_USAGE
           rescue Exception => e
-            ef = ErrorFormatter.new(force_cause: [RecipeEvaluationError])
+            ef = ErrorFormatter.new(
+              debug:        cli.env.debug?,
+              force_cause:  [RecipeEvaluationError]
+            )
             stderr.puts ef.format e
             exit EX_SOFTWARE
           end
@@ -66,6 +69,10 @@ module Producer
             env.verbose = true
           end
 
+          opts.on '-d', '--debug', 'enable debug mode' do |e|
+            env.debug = true
+          end
+
           opts.on '-n', '--dry-run', 'enable dry run mode' do |e|
             env.dry_run = true
           end

lib/producer/core/env.rb

@@ -2,10 +2,10 @@ module Producer
   module Core
     class Env
       attr_reader   :input, :output, :error_output, :registry, :logger
-      attr_accessor :target, :verbose, :dry_run
+      attr_accessor :target, :verbose, :debug, :dry_run
 
       def initialize(input: $stdin, output: $stdout, error_output: $stderr, remote: nil, registry: {})
-        @verbose      = @dry_run = false
+        @verbose = @debug = @dry_run = false
         @input        = input
         @output       = output
         @error_output = error_output
@@ -45,6 +45,10 @@ module Producer
         @verbose
       end
 
+      def debug?
+        @debug
+      end
+
       def dry_run?
         @dry_run
       end