oh yes

mono-fmt-macro/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "mono-fmt-macro"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+quote = "1.0.21"
+syn = "1.0.99"

mono-fmt-macro/src/lib.rs

@@ -0,0 +1,31 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{
+    parse::{Parse, ParseStream},
+    Expr, parse_macro_input,
+};
+
+struct Input {
+    format_str: String,
+    items: Vec<Expr>,
+}
+
+impl Parse for Input {
+    fn parse(input: ParseStream) -> syn::Result<Self> {
+        let first = input.parse::<syn::LitStr>()?;
+        Ok(Self {
+            format_str: first.value(),
+            items: Vec::new(),
+        })
+    }
+}
+
+#[proc_macro]
+pub fn format_args(tokens: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(tokens as Input);
+    let str = input.format_str;
+    quote! {
+        (mono_fmt::_private::Str(#str),)
+    }
+    .into()
+}