Ruby CLI: Show compiled source when compile produces invalid Ruby

Author: marcoroth

lib/herb/cli.rb

@@ -462,6 +462,24 @@ def compile_template
       end
 
       exit(0)
+    rescue Herb::Engine::InvalidRubyError => e
+      if json
+        result = {
+          success: false,
+          error: e.message,
+          source: e.compiled_source,
+          filename: @file,
+        }
+        puts result.to_json
+      elsif silent
+        puts "Failed"
+      else
+        puts e.compiled_source if e.compiled_source
+        puts
+        puts e.message
+      end
+
+      exit(1)
     rescue Herb::Engine::CompilationError => e
       if json
         result = {

lib/herb/engine.rb

@@ -32,6 +32,13 @@ class CompilationError < StandardError
     end
 
     class InvalidRubyError < CompilationError
+      attr_reader :compiled_source
+
+      def initialize(message, compiled_source: nil)
+        @compiled_source = compiled_source
+
+        super(message)
+      end
     end
 
     def initialize(input, properties = {})
@@ -155,7 +162,7 @@ def initialize(input, properties = {})
 
         if syntax_errors.any?
           details = syntax_errors.map { |e| "  - #{e.message} (line #{e.location.start_line})" }.join("\n")
-          raise InvalidRubyError, "Compiled template produced invalid Ruby:\n#{details}"
+          raise InvalidRubyError.new("Compiled template produced invalid Ruby:\n#{details}", compiled_source: @src)
         end
       end