Moved NovaForth into a crate with a build script

novaforth/build.rs

@@ -0,0 +1,38 @@
+use std::collections::BTreeMap;
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use serde_json::json;
+use vasm_core::assemble_file;
+
+fn main() {
+    env::set_current_dir("src").expect("Can't chdir into src. Am I being run as a build script?");
+    // We're doing test_init because it compiles the Novaforth interpreter but not any code to actually run it,
+    // 0x400 is just "stop: hlt".
+    // TODO: we need a system for building ROMs and actually booting the machine.
+    // This is fine for now, for use by `vweb`.
+    match assemble_file("test_init.asm") {
+        Ok((bytes, scope)) => {
+            println!("Assembled {} bytes", bytes.len());
+            let dir = env::var("OUT_DIR").expect("OUT_DIR not specified. Am I being run as a build script?");
+            let filename = Path::new(dir.as_str()).join("4th.rom");
+            let mut f = File::create(filename).expect("Unable to open output file");
+            f.write(bytes.as_slice()).expect("Unable to write to output file");
+
+            let mut important_symbols : BTreeMap<String, i32> = BTreeMap::new();
+            for (sym, addr) in scope {
+                if !sym.starts_with("__gensym") {
+                    important_symbols.insert(sym, addr);
+                }
+            }
+
+            let mut symfile = File::create(Path::new(dir.as_str()).join("4th.rom.sym")).expect("Unable to open symbol file");
+            let json = json!(important_symbols).to_string();
+            symfile.write(json.as_bytes()).expect("Unable to write to symbol file");
+        }
+        Err(e) => {
+            eprintln!("{}", e)
+        }
+    }
+}