switch to new codegen

crates/ra_tools/src/codegen.rs

@@ -1,7 +1,21 @@
-use std::path::Path;
+use std::{fs, path::Path};
 
-use crate::{Mode, Result};
+use ron;
 
-pub fn generate_ast(grammar_src: &Path, dst: &Path, mode: Mode) -> Result<()> {
+use crate::{project_root, Mode, Result, AST, GRAMMAR};
+
+pub fn generate(mode: Mode) -> Result<()> {
+    let grammar = project_root().join(GRAMMAR);
+    // let syntax_kinds = project_root().join(SYNTAX_KINDS);
+    let ast = project_root().join(AST);
+    generate_ast(&grammar, &ast, mode)
+}
+
+fn generate_ast(grammar_src: &Path, dst: &Path, mode: Mode) -> Result<()> {
+    let src: ron::Value = {
+        let text = fs::read_to_string(grammar_src)?;
+        ron::de::from_str(&text)?
+    };
+    eprintln!("{:?}", src);
     Ok(())
 }