Implement sbt file parser (#14890)

* implement sbt version and requirement classes

* bump sorbet typing to strong in version class

* add sbt version pattern and reference it

* implement sbt file fetcher

* add check for exclude paths and improve regex matching

* implement sbt file parser

* add sbt to valid package manager list in dry-run file

* bump sorbet typing from strict to strong

* handle edge cases in repositories_finder and file_parser

Author: AbhishekBhaskar

bin/dry-run.rb

@@ -143,6 +143,7 @@
 require "dependabot/pre_commit"
 require "dependabot/pub"
 require "dependabot/python"
+require "dependabot/sbt"
 require "dependabot/swift"
 require "dependabot/terraform"
 require "dependabot/opentofu"
@@ -388,6 +389,7 @@
   pub
   python
   rust_toolchain
+  sbt
   swift
   terraform
   opentofu

sbt/lib/dependabot/sbt/file_fetcher.rb

@@ -45,6 +45,7 @@ def fetch_files
         fetched_files << T.must(plugins_sbt) if plugins_sbt
         fetched_files << T.must(build_properties) if build_properties
         fetched_files += subproject_build_files
+        fetched_files += project_scala_files
 
         fetched_files.reject do |file|
           Dependabot::FileFiltering.should_exclude_path?(file.name, "file from final collection", @exclude_paths)
@@ -91,6 +92,14 @@ def subproject_build_files
           .filter_map { |dir| fetch_file_if_present(File.join(dir.name, BUILD_SBT_FILENAME)) }
       end
 
+      sig { returns(T::Array[DependencyFile]) }
+      def project_scala_files
+        project_dir_contents = repo_contents(dir: "project", raise_errors: false)
+        project_dir_contents
+          .select { |item| item.type == "file" && item.name.end_with?(".scala") }
+          .filter_map { |item| fetch_file_if_present(File.join("project", item.name)) }
+      end
+
       sig { params(content: T.nilable(String)).returns(T.nilable(String)) }
       def parse_sbt_version(content)
         return nil unless content