add support for ruby

Cargo.toml

@@ -55,6 +55,7 @@ tree-sitter-java = "0.20.2"
 # TODO: Update after: https://github.com/alex-pinkus/tree-sitter-swift/issues/278 resolves
 tree-sitter-swift = { git = "https://github.com/satyam1749/tree-sitter-swift.git", rev = "08a28993599f1968bc81631a89690503e1db7704" }
 tree-sitter-python = "0.20.2"
+tree-sitter-ruby = "0.20.1"
 tree-sitter-typescript = "0.20.1"
 # TODO: Update after https://github.com/tree-sitter/tree-sitter-go/pull/103 lands
 tree-sitter-go = { git = "https://github.com/uber/tree-sitter-go.git", rev = "f8cffd0af7baaf7bf6062e403efe7c0d06319c41" }

src/cleanup_rules/ruby/edges.toml

@@ -0,0 +1,50 @@
+[[edges]]
+scope = "Parent"
+from = "replace_expression_with_boolean_literal"
+to = ["boolean_literal_cleanup"]
+
+
+[[edges]]
+scope = "Parent"
+from = "boolean_literal_cleanup"
+to = ["boolean_expression_simplify", "statement_cleanup", "block_removal"]
+
+[[edges]]
+scope = "Parent"
+from = "boolean_expression_simplify"
+to = ["boolean_literal_cleanup"]
+
+[[edges]]
+scope = "Parent"
+from = "statement_cleanup"
+to = ["if_cleanup"]
+
+[[edges]]
+scope = "Parent"
+from = "if_cleanup"
+to = ["delete_all_statements_after_return"]
+
+[[edges]]
+scope = "Parent"
+from = "delete_all_statements_after_return"
+to = ["delete_all_statements_after_return"]
+
+[[edges]]
+scope = "Parent"
+from = "statement_cleanup"
+to = ["delete_variable_declaration"]
+
+[[edges]]
+scope = "Method"
+from = "delete_variable_declaration"
+to = ["replace_identifier_with_value"]
+
+[[edges]]
+scope = "Parent"
+from = "replace_identifier_with_value"
+to = ["boolean_literal_cleanup"]
+
+[[edges]]
+scope = "Parent"
+from = "delete_variable_declaration"
+to = ["identify_empty_methods"]