various: Rework document to support multiple implementations

In order to eventually shift the document metadata to support
more than one template defined for the document this reworks
all the internal APIs to expect templates, and also the external
CLI to be able to provide it.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/subplot-build/src/lib.rs b/subplot-build/src/lib.rs
index 89ea57d..28558e8 100644
--- a/subplot-build/src/lib.rs
+++ b/subplot-build/src/lib.rs
@@ -48,21 +48,26 @@ where
         buildrs_output(out_dir, filename, "rs").expect("could not create output filename");
 
     // Generate test program.
-    let output = subplot::codegen(filename, &test_rs)?;
+    let output = subplot::codegen(filename, &test_rs, Some("rust"))?;
 
     // Write instructions for Cargo to check if build scripts needs
     // re-running.
     let base_path = get_basedir_from(filename);
     let meta = output.doc.meta();
-    buildrs_deps(&base_path, &meta.bindings_filenames());
-    buildrs_deps(&base_path, &meta.functions_filenames());
-    buildrs_deps(&base_path, &[filename]);
+    buildrs_deps(&base_path, meta.bindings_filenames());
+    let docimpl = output
+        .doc
+        .meta()
+        .document_impl("rust")
+        .expect("We managed to codegen rust, yet the spec is missing?");
+    buildrs_deps(&base_path, docimpl.functions_filenames());
+    buildrs_deps(&base_path, Some(filename));
 
     event!(Level::TRACE, "Finished generating code");
     Ok(())
 }
 
-fn buildrs_deps(base_path: &Path, filenames: &[&Path]) {
+fn buildrs_deps<'a>(base_path: &Path, filenames: impl IntoIterator<Item = &'a Path>) {
     for filename in filenames {
         let filename = base_path.join(filename);
         if filename.exists() {