split export macro into separate export macros for each plugin format

Author: Quant1um

README.md

@@ -26,7 +26,10 @@ clap-wrapper = { git = "https://github.com/blepfx/clap-wrapper-rs" }
 
 Then, in your `lib.rs`:
 ```rust
-clap_wrapper::export!();
+// exports `GetPluginFactoryAUV2` symbol if CLAP_WRAPPER_AUV2_SDK env variable is present
+clap_wrapper::export_auv2!(); 
+// exports `GetPluginFactory` symbol and extra VST3 symbols if CLAP_WRAPPER_VST3_SDK env variable is present
+clap_wrapper::export_vst3!(); 
 ```
 
 This will export VST3 and AUv2 entrypoints that use the `clap_entry` symbol exported from your crate (as an example, `nih_plug::nih_export_clap` exports it).

examples/example-clack/src/lib.rs

@@ -232,4 +232,5 @@ pub struct PolySynthPluginMainThread<'a> {
 impl<'a> PluginMainThread<'a, PolySynthPluginShared> for PolySynthPluginMainThread<'a> {}
 
 clack_export_entry!(SinglePluginEntry<PolySynthPlugin>);
-clap_wrapper::export!();
+clap_wrapper::export_auv2!();
+clap_wrapper::export_vst3!();

examples/example-nih-plug/src/lib.rs

@@ -176,4 +176,5 @@ impl Vst3Plugin for Gain {
 }
 
 nih_export_clap!(Gain);
-clap_wrapper::export!();
+clap_wrapper::export_auv2!();
+clap_wrapper::export_vst3!();

src/lib.rs

@@ -19,10 +19,16 @@ pub mod auv2;
 pub mod auv2 {}
 
 #[macro_export]
-macro_rules! export {
+macro_rules! export_auv2 {
     () => {
         #[allow(unused_imports)]
         pub use $crate::auv2::*;
+    };
+}
+
+#[macro_export]
+macro_rules! export_vst3 {
+    () => {
         #[allow(unused_imports)]
         pub use $crate::vst3::*;
     };