Actually autogenerate the trait

schala-codegen/src/lib.rs

@@ -13,14 +13,43 @@ pub fn print_a_thing(_input: TokenStream) -> TokenStream {
 }
 
 
-#[proc_macro_derive(ProgrammingLanguageInterface)]
+#[proc_macro_derive(ProgrammingLanguageInterface, attributes(LanguageName, FileExtension, PipelineSteps))]
 pub fn derive_programming_language_interface(input: TokenStream) -> TokenStream {
   let ast: DeriveInput = syn::parse(input).unwrap();
   let name = &ast.ident;
+
   let tokens = quote! {
     impl ProgrammingLanguageInterface for #name {
+      fn get_language_name(&self) -> String {
+        "Schala".to_string()
+      }
+
+      fn get_source_file_suffix(&self) -> String {
+        format!("schala")
+      }
+      fn execute_pipeline(&mut self, input: &str, options: &EvalOptions) -> FinishedComputation {
+        let mut chain = pass_chain![self, options;
+        tokenizing_stage,
+        parsing_stage,
+        symbol_table_stage,
+        typechecking_stage,
+        eval_stage
+        ];
+        chain(input)
+      }
+
+      fn get_stages(&self) -> Vec<String> {
+        vec![
+          format!("tokenizing_stage"),
+          format!("parsing_stage"), //TODO handle both types of this
+          format!("symbol_table_stage"),
+          format!("typechecking_stage"),
+          format!("eval_stage")
+        ]
+      }
     }
   };
+
   tokens.into()
 }
 

schala-lang/src/lib.rs

@@ -8,6 +8,7 @@ extern crate maplit;
 
 #[macro_use]
 extern crate schala_repl;
+#[macro_use]
 extern crate schala_codegen;
 
 use itertools::Itertools;
@@ -26,6 +27,7 @@ mod eval;
 
 use self::typechecking::{TypeContext};
 
+#[derive(ProgrammingLanguageInterface)]
 pub struct Schala {
   state: eval::State<'static>,
   type_context: TypeContext
@@ -98,6 +100,7 @@ fn eval_stage(handle: &mut Schala, input: parsing::AST, _comp: Option<&mut Unfin
   eval_output
 }
 
+/*
 impl ProgrammingLanguageInterface for Schala {
   fn get_language_name(&self) -> String {
     "Schala".to_string()
@@ -128,3 +131,4 @@ impl ProgrammingLanguageInterface for Schala {
     ]
   }
 }
+*/