add timeseries macro

oximeter/timeseries-macro/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "oximeter-timeseries-macro"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+oximeter-impl.workspace = true
+proc-macro2.workspace = true
+syn.workspace = true
+
+[lints]
+workspace = true

oximeter/timeseries-macro/src/lib.rs

@@ -0,0 +1,26 @@
+extern crate proc_macro;
+
+#[proc_macro]
+pub fn use_timeseries(
+    tokens: proc_macro::TokenStream,
+) -> proc_macro::TokenStream {
+    match syn::parse::<syn::LitStr>(tokens) {
+        Ok(dir) => {
+            let dir_name = dir.value();
+            match oximeter_impl::schema::codegen::use_timeseries(&dir_name) {
+                Ok(toks) => return toks.into(),
+                Err(e) => {
+                    let msg = format!(
+                        "Failed to generate timeseries types \
+                        from directory '{}': {:?}",
+                        dir_name, e,
+                    );
+                    return syn::Error::new(dir.span(), msg)
+                        .into_compile_error()
+                        .into();
+                }
+            }
+        }
+        Err(e) => return e.into_compile_error().into(),
+    }
+}