Use Prism in Sorbet calls, if enabled

Author: amomchilov

lib/tapioca/helpers/sorbet_helper.rb

@@ -13,15 +13,52 @@ module SorbetHelper
 
     SPOOM_CONTEXT = Spoom::Context.new(".") #: Spoom::Context
 
+    # Represents the `sorbet/config` file, and provides access to its options.
+    # If the file doesn't exist, this object will still exist, but will return default values for all options.
+    class SorbetConfig
+      #: (spoom_context: Spoom::Context) -> void
+      def initialize(spoom_context:)
+        config_path = File.join(spoom_context.absolute_path, "sorbet", "config")
+        lines = File.exist?(config_path) ? File.read(config_path).lines.map(&:strip).reject(&:empty?) : []
+
+        options = lines.filter_map do |line|
+          next if line.start_with?("#") # Skip comments
+          next unless line.start_with?("--")
+
+          key, value = line.split("=", 2)
+          key = key #: as !nil
+
+          [key, value]
+        end.to_h #: Hash[String, String | bool | nil]
+
+        @parser = options["--parser"] == "prism" ? :prism : :original #: Symbol
+      end
+
+      #: Symbol
+      attr_reader :parser
+
+      #: -> bool
+      def parse_with_prism? = @parser == :prism
+    end
+
     FEATURE_REQUIREMENTS = {
       # feature_name: ::Gem::Requirement.new(">= ___"), # https://github.com/sorbet/sorbet/pull/___
     }.freeze #: Hash[Symbol, ::Gem::Requirement]
 
     #: (*String sorbet_args) -> Spoom::ExecResult
     def sorbet(*sorbet_args)
+      if sorbet_config.parse_with_prism?
+        sorbet_args << "--parser=prism"
+      end
+
       SPOOM_CONTEXT.srb(sorbet_args.join(" "), sorbet_bin: sorbet_path)
     end
 
+    #: -> SorbetConfig
+    def sorbet_config
+      @sorbet_config ||= SorbetConfig.new(spoom_context: SPOOM_CONTEXT) #: SorbetConfig?
+    end
+
     #: -> String
     def sorbet_path
       sorbet_path = ENV.fetch(SORBET_EXE_PATH_ENV_VAR, SORBET_BIN)