Add a ClapPlugin trait

Just like the Vst3Plugin trait

Cargo.lock

@@ -101,6 +101,11 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clap-sys"
+version = "0.1.0"
+source = "git+https://github.com/glowcoil/clap-sys?rev=3ef7048e1d3b426a7c6b02b5d3ae18f14874d4e5#3ef7048e1d3b426a7c6b02b5d3ae18f14874d4e5"
+
 [[package]]
 name = "clipboard-win"
 version = "3.1.1"
@@ -530,6 +535,7 @@ dependencies = [
  "assert_no_alloc",
  "atomic_float",
  "cfg-if",
+ "clap-sys",
  "crossbeam",
  "lazy_static",
  "nih_plug_derive",

Cargo.toml

@@ -33,6 +33,8 @@ nih_plug_derive = { path = "nih_plug_derive" }
 
 atomic_float = "0.1"
 cfg-if = "1.0"
+# For CLAP 0.18
+clap-sys = { git = "https://github.com/glowcoil/clap-sys", rev = "3ef7048e1d3b426a7c6b02b5d3ae18f14874d4e5" }
 crossbeam = "0.8"
 lazy_static = "1.4"
 parking_lot = "0.12"

plugins/diopser/src/lib.rs

@@ -18,7 +18,8 @@
 extern crate nih_plug;
 
 use nih_plug::{
-    formatters, Buffer, BufferConfig, BusConfig, Plugin, ProcessContext, ProcessStatus, Vst3Plugin,
+    formatters, Buffer, BufferConfig, BusConfig, ClapPlugin, Plugin, ProcessContext, ProcessStatus,
+    Vst3Plugin,
 };
 use nih_plug::{BoolParam, FloatParam, IntParam, Params, Range, SmoothingStyle};
 use nih_plug::{Enum, EnumParam};
@@ -409,6 +410,8 @@ fn unnormalize_automation_precision(normalized: f32) -> u32 {
         - (normalized * (MAX_AUTOMATION_STEP_SIZE - MIN_AUTOMATION_STEP_SIZE) as f32).round() as u32
 }
 
+impl ClapPlugin for Diopser {}
+
 impl Vst3Plugin for Diopser {
     const VST3_CLASS_ID: [u8; 16] = *b"DiopserPlugRvdH.";
     const VST3_CATEGORIES: &'static str = "Fx|Filter";

plugins/examples/gain-gui/src/lib.rs

@@ -3,8 +3,8 @@ extern crate nih_plug;
 
 use atomic_float::AtomicF32;
 use nih_plug::{
-    util, Buffer, BufferConfig, BusConfig, Editor, IntParam, Plugin, ProcessContext, ProcessStatus,
+    util, Buffer, BufferConfig, BusConfig, ClapPlugin, Editor, IntParam, Plugin, ProcessContext,
-    Vst3Plugin,
+    ProcessStatus, Vst3Plugin,
 };
 use nih_plug::{FloatParam, Params, Range, SmoothingStyle};
 use nih_plug_egui::{create_egui_editor, egui, widgets, EguiState};
@@ -202,6 +202,8 @@ impl Plugin for Gain {
     }
 }
 
+impl ClapPlugin for Gain {}
+
 impl Vst3Plugin for Gain {
     const VST3_CLASS_ID: [u8; 16] = *b"GainGuiYeahBoyyy";
     const VST3_CATEGORIES: &'static str = "Fx|Dynamics";

plugins/examples/gain/src/lib.rs

@@ -2,8 +2,8 @@
 extern crate nih_plug;
 
 use nih_plug::{
-    formatters, util, Buffer, BufferConfig, BusConfig, Plugin, ProcessContext, ProcessStatus,
+    formatters, util, Buffer, BufferConfig, BusConfig, ClapPlugin, Plugin, ProcessContext,
-    Vst3Plugin,
+    ProcessStatus, Vst3Plugin,
 };
 use nih_plug::{BoolParam, FloatParam, Params, Range, Smoother, SmoothingStyle};
 use parking_lot::RwLock;
@@ -129,6 +129,8 @@ impl Plugin for Gain {
     }
 }
 
+impl ClapPlugin for Gain {}
+
 impl Vst3Plugin for Gain {
     const VST3_CLASS_ID: [u8; 16] = *b"GainMoistestPlug";
     const VST3_CATEGORIES: &'static str = "Fx|Dynamics";

plugins/examples/sine/src/lib.rs

@@ -2,8 +2,8 @@
 extern crate nih_plug;
 
 use nih_plug::{
-    formatters, util, Buffer, BufferConfig, BusConfig, Plugin, ProcessContext, ProcessStatus,
+    formatters, util, Buffer, BufferConfig, BusConfig, ClapPlugin, Plugin, ProcessContext,
-    Vst3Plugin,
+    ProcessStatus, Vst3Plugin,
 };
 use nih_plug::{BoolParam, FloatParam, Params, Range, Smoother, SmoothingStyle};
 use std::f32::consts;
@@ -176,6 +176,8 @@ impl Plugin for Sine {
     }
 }
 
+impl ClapPlugin for Sine {}
+
 impl Vst3Plugin for Sine {
     const VST3_CLASS_ID: [u8; 16] = *b"SineMoistestPlug";
     const VST3_CATEGORIES: &'static str = "Instrument|Synth|Tools";

src/lib.rs

@@ -19,8 +19,8 @@ pub use param::range::Range;
 pub use param::smoothing::{Smoother, SmoothingStyle};
 pub use param::{BoolParam, FloatParam, IntParam, Param};
 pub use plugin::{
-    BufferConfig, BusConfig, Editor, NoteEvent, ParentWindowHandle, Plugin, ProcessStatus,
+    BufferConfig, BusConfig, ClapPlugin, Editor, NoteEvent, ParentWindowHandle, Plugin,
-    Vst3Plugin,
+    ProcessStatus, Vst3Plugin,
 };
 
 // The rest is either internal or already re-exported

src/plugin.rs

@@ -101,6 +101,11 @@ pub trait Plugin: Default + Send + Sync + 'static {
     fn process(&mut self, buffer: &mut Buffer, context: &mut impl ProcessContext) -> ProcessStatus;
 }
 
+/// Provides auxiliary metadata needed for a CLAP plugin.
+pub trait ClapPlugin: Plugin {
+    // TODO: Add the required fields, just like the [Vst3Plugin] trait
+}
+
 /// Provides auxiliary metadata needed for a VST3 plugin.
 pub trait Vst3Plugin: Plugin {
     /// The unique class ID that identifies this particular plugin. You can use the