feat: add parser support for completion

src/parsers/completion_parser.cr

@@ -4,6 +4,7 @@ module GX::Parsers
   class CompletionParser < AbstractParser
     def build(parser, ancestors, config)
       breadcrumbs = ancestors + "completion"
+      # config.mode = Types::Mode::CompletionAutodetect
 
       parser.banner = Utils.usage_line(
         breadcrumbs,
@@ -13,10 +14,12 @@ module GX::Parsers
       parser.separator("\nCompletion commands:")
 
       parser.on("--bash", "Generate bash completion") do |_|
+        config.mode = Types::Mode::CompletionBash
         Log.info { "Set bash completion" }
       end
 
       parser.on("--zsh", "Generate zsh completion") do |_|
+        config.mode = Types::Mode::CompletionZsh
         Log.info { "Set zsh completion" }
       end
 

src/parsers/root_parser.cr

@@ -69,7 +69,10 @@ module GX::Parsers
       # end
 
       parser.on("completion", "Manage completion") do
-        config.mode = Types::Mode::GlobalCompletion
+        config.mode = Types::Mode::GlobalHelp
+        config.help_options = Parsers::Options::HelpOptions.new
+        config.help_options.try(&.parser_snapshot=(parser.dup))
+
         Parsers::CompletionParser.new.build(parser, breadcrumbs, config)
       end