1 files changed, 270 insertions, 0 deletions
diff --git a/crates/macros/src/lib.rs b/crates/macros/src/lib.rs
new file mode 100644
index 0000000..d32ab69
--- /dev/null
+++ b/crates/macros/src/lib.rs
@@ -0,0 +1,270 @@
+use heck::ToLowerCamelCase;
+use proc_macro::TokenStream;
+use quote::quote;
+use std::collections::BTreeSet;
+use syn::{parse_macro_input, FnArg, Ident, ItemFn, Pat, PathArguments, ReturnType, Type};
+
+use crate::attr::MacroArgs;
+
+mod attr;
+
+const TAURI_NATIVE_TYPES: &[&str] = &["Window", "State", "AppHandle"];
+fn is_tauri_native(ty: &Type) -> bool {
+    // Unwrap reference
+    let mut t = ty;
+    if let Type::Reference(r) = t {
+        t = &*r.elem;
+    }
+
+    if let Type::Path(p) = t {
+        if let Some(seg) = p.path.segments.last() {
+            let ident = seg.ident.to_string();
+            if TAURI_NATIVE_TYPES.contains(&ident.as_ref()) {
+                return true;
+            }
+        }
+    }
+    false
+}
+
+fn extract_ident_from_type(ty: &Type) -> Option<String> {
+    // Peel references, arrays, etc. Only handle Path types
+    let mut t = ty;
+    if let Type::Reference(r) = t {
+        t = &*r.elem;
+    }
+
+    if let Type::Path(p) = t {
+        // Handle Option<T>, Result, etc.
+        if let Some(seg) = p.path.segments.last() {
+            let ident = seg.ident.to_string();
+            match ident.as_str() {
+                "Option" | "Vec" => {
+                    // extract generic arg (use helper)
+                    if let Some(inner) = first_type_arg_from_pathargs(&seg.arguments) {
+                        return extract_ident_from_type(inner);
+                    }
+                }
+                // For multi-segment like core::java::JavaDownloadInfo we return last segment ident
+                _ => return Some(ident),
+            }
+        }
+    }
+    None
+}
+
+fn first_type_arg_from_pathargs(pa: &PathArguments) -> Option<&Type> {
+    // Given PathArguments (e.g. from a PathSegment), return the first GenericArgument::Type if present.
+    if let PathArguments::AngleBracketed(ab) = pa {
+        for arg in ab.args.iter() {
+            if let syn::GenericArgument::Type(ty) = arg {
+                return Some(ty);
+            }
+        }
+    }
+    None
+}
+
+fn rust_type_to_ts(ty: &Type) -> (String, bool) {
+    // returns (ts_type, is_struct_like)
+    // is_struct_like signals that this type probably needs import from `import_from`
+    // Simple mapping: String -> string, primitives -> number, bool -> boolean, others -> ident
+    let mut t = ty;
+    // Unwrap references
+    if let Type::Reference(r) = t {
+        t = &*r.elem;
+    }
+
+    if let Type::Tuple(tuple) = t {
+        if tuple.elems.is_empty() {
+            return ("void".to_string(), false);
+        }
+    }
+
+    if let Type::Path(p) = t {
+        if let Some(seg) = p.path.segments.last() {
+            let ident = seg.ident.to_string();
+            // handle Option<T>
+            if ident == "Option" {
+                if let Some(inner) = first_type_arg_from_pathargs(&seg.arguments) {
+                    let (inner_ts, inner_struct) = rust_type_to_ts(inner);
+                    // make optional, represent as type | null
+                    return (format!("{} | null", inner_ts), inner_struct);
+                }
+            }
+            return match ident.as_str() {
+                "String" => ("string".to_string(), false),
+                "str" => ("string".to_string(), false),
+                "bool" => ("boolean".to_string(), false),
+                "u8" | "u16" | "u32" | "u64" | "u128" | "i8" | "i16" | "i32" | "i64" | "i128"
+                | "usize" | "isize" | "f32" | "f64" => ("number".to_string(), false),
+                "Vec" => {
+                    // Vec<T> -> T[]
+                    if let Some(inner) = first_type_arg_from_pathargs(&seg.arguments) {
+                        let (inner_ts, inner_struct) = rust_type_to_ts(inner);
+                        return (format!("{}[]", inner_ts), inner_struct);
+                    }
+                    ("unknown[]".to_string(), false)
+                }
+                other => {
+                    // treat as struct/complex type
+                    (other.to_string(), true)
+                }
+            };
+        }
+    }
+    ("unknown".to_string(), false)
+}
+
+fn get_return_ts(ty: &ReturnType) -> (String, BTreeSet<String>) {
+    // returns (promise_ts_type, set_of_structs_to_import)
+    let mut imports = BTreeSet::new();
+    match ty {
+        ReturnType::Default => ("Promise<void>".to_string(), imports),
+        ReturnType::Type(_, boxed) => {
+            // look for Result<T, E> commonly
+            let t = &**boxed;
+            if let Type::Path(p) = t {
+                if let Some(seg) = p.path.segments.last() {
+                    let ident = seg.ident.to_string();
+                    if ident == "Result" {
+                        if let Some(ok_ty) = first_type_arg_from_pathargs(&seg.arguments) {
+                            let (ts, is_struct) = rust_type_to_ts(ok_ty);
+                            if is_struct {
+                                if let Some(name) = extract_ident_from_type(ok_ty) {
+                                    imports.insert(name);
+                                }
+                            }
+                            return (format!("Promise<{}>", ts), imports);
+                        }
+                    } else {
+                        // not Result - map directly
+                        let (ts, is_struct) = rust_type_to_ts(t);
+                        if is_struct {
+                            if let Some(name) = extract_ident_from_type(t) {
+                                imports.insert(name);
+                            }
+                        }
+                        return (format!("Promise<{}>", ts), imports);
+                    }
+                }
+            }
+            // fallback
+            ("Promise<unknown>".to_string(), imports)
+        }
+    }
+}
+
+#[proc_macro_attribute]
+pub fn api(attr: TokenStream, item: TokenStream) -> TokenStream {
+    // Parse attribute args via `darling` crate
+    let meta: MacroArgs = match syn::parse(attr) {
+        Ok(meta) => meta,
+        Err(err) => return err.into_compile_error().into(),
+    };
+    let input_fn = parse_macro_input!(item as ItemFn);
+    let import_from = meta.import_from;
+
+    // Analyze function
+    let fn_name_ident: Ident = input_fn.sig.ident.clone();
+    let fn_name = fn_name_ident.to_string();
+    let ts_fn_name = fn_name.to_lower_camel_case();
+
+    // Collect parameters (ignore State/Window)
+    let mut param_names: Vec<String> = Vec::new();
+    let mut param_defs: Vec<String> = Vec::new();
+    let mut import_types: BTreeSet<String> = BTreeSet::new();
+
+    for input in input_fn.sig.inputs.iter() {
+        match input {
+            FnArg::Receiver(_) => {
+                // skip self
+            }
+            FnArg::Typed(pt) => {
+                // Get parameter identifier
+                let pat = &*pt.pat;
+                let param_ident = if let Pat::Ident(pi) = pat {
+                    Some(pi.ident.to_string())
+                } else {
+                    // ignore complex patterns
+                    continue;
+                };
+
+                // Check if type should be ignored (State, Window)
+                if is_tauri_native(&*pt.ty) {
+                    continue;
+                }
+
+                // Map type
+                let (ts_type, is_struct) = rust_type_to_ts(&*pt.ty);
+                if is_struct {
+                    if let Some(name) = extract_ident_from_type(&*pt.ty) {
+                        import_types.insert(name);
+                    }
+                }
+
+                if let Some(pn) = param_ident {
+                    // Convert param name to camelCase - keep existing but ensure camelCase for TS
+                    // We'll convert snake_case param names to camelCase
+                    let ts_param_name = pn.to_lower_camel_case();
+                    param_names.push(ts_param_name.clone());
+                    param_defs.push(format!("{}: {}", ts_param_name, ts_type));
+                }
+            }
+        }
+    }
+
+    // Return type
+    let (return_ts_promise, return_imports) = get_return_ts(&input_fn.sig.output);
+    import_types.extend(return_imports);
+
+    // Prepare test mod name
+    let test_mod_name = Ident::new(
+        &format!("__dropout_export_tests_{}", fn_name),
+        fn_name_ident.span(),
+    );
+    // Prepare test function name
+    let test_fn_name = Ident::new(
+        &format!("tauri_export_bindings_{}", fn_name),
+        fn_name_ident.span(),
+    );
+
+    // Build tokens
+    let original_fn = &input_fn;
+    let return_ts_promise_lit =
+        syn::LitStr::new(&return_ts_promise, proc_macro2::Span::call_site());
+    let import_from_lit = match &import_from {
+        Some(s) => syn::Ident::new(&format!("Some({})", s), proc_macro2::Span::call_site()),
+        None => syn::Ident::new("None", proc_macro2::Span::call_site()),
+    };
+
+    let register_stmt = quote! {
+      ::inventory::submit! {
+        crate::utils::api::ApiInfo {
+          fn_name: #fn_name,
+          ts_fn_name: #ts_fn_name,
+          param_names: &[#(#param_names),*],
+          param_defs: &[#(#param_defs),*],
+          return_ts_promise: #return_ts_promise_lit,
+          import_types: &[#(#import_types),*],
+          import_from: #import_from_lit,
+        }
+      }
+    };
+
+    let gen = quote! {
+        #original_fn
+
+        #[cfg(test)]
+        mod #test_mod_name {
+            use crate::utils::api::*;
+
+            #[test]
+            fn #test_fn_name() {
+                #register_stmt
+            }
+        }
+    };
+
+    gen.into()
+}