From 797fc8394f5510aa7e4a4d5d87d61a46fd849da8 Mon Sep 17 00:00:00 2001
From: Gwilym Inzani <email@gwilym.dev>
Date: Wed, 1 Nov 2023 11:32:41 +0000
Subject: [PATCH] Boilerplate for midi support

---
 tracker/agb-midi-core/Cargo.toml | 22 ++++++++++
 tracker/agb-midi-core/src/lib.rs | 70 ++++++++++++++++++++++++++++++++
 tracker/agb-midi/Cargo.toml      | 16 ++++++++
 tracker/agb-midi/src/lib.rs      |  8 ++++
 tracker/agb-tracker/Cargo.toml   |  4 +-
 5 files changed, 119 insertions(+), 1 deletion(-)
 create mode 100644 tracker/agb-midi-core/Cargo.toml
 create mode 100644 tracker/agb-midi-core/src/lib.rs
 create mode 100644 tracker/agb-midi/Cargo.toml
 create mode 100644 tracker/agb-midi/src/lib.rs

diff --git a/tracker/agb-midi-core/Cargo.toml b/tracker/agb-midi-core/Cargo.toml
new file mode 100644
index 00000000..125097d9
--- /dev/null
+++ b/tracker/agb-midi-core/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "agb_midi_core"
+version = "0.18.0"
+authors = ["Gwilym Inzani <gw@ilym.me>"]
+edition = "2021"
+license = "MPL-2.0"
+description = "Library for converting MIDI files for use with agb-tracker on the Game Boy Advance. You shouldn't use this package directly"
+repository = "https://github.com/agbrs/agb"
+
+[dependencies]
+proc-macro-error = "1"
+proc-macro2 = "1"
+quote = "1"
+syn = "2"
+rustysynth = "1.3"
+midly = { version = "0.5", default-features = false, features = [
+    "alloc",
+    "std",
+] }
+
+agb_tracker_interop = { version = "0.18.0", path = "../agb-tracker-interop" }
+agb_fixnum = { version = "0.18.0", path = "../../agb-fixnum" }
diff --git a/tracker/agb-midi-core/src/lib.rs b/tracker/agb-midi-core/src/lib.rs
new file mode 100644
index 00000000..f71079b5
--- /dev/null
+++ b/tracker/agb-midi-core/src/lib.rs
@@ -0,0 +1,70 @@
+use std::{error::Error, path::Path};
+
+use proc_macro2::TokenStream;
+use proc_macro_error::abort;
+use quote::quote;
+use syn::{
+    parse::{Parse, ParseStream},
+    LitStr, Token,
+};
+
+struct MidiCoreInput {
+    sf2_file: LitStr,
+    comma: Token![,],
+    midi_file: LitStr,
+}
+
+impl Parse for MidiCoreInput {
+    fn parse(input: ParseStream) -> syn::Result<Self> {
+        Ok(Self {
+            sf2_file: input.parse()?,
+            comma: input.parse()?,
+            midi_file: input.parse()?,
+        })
+    }
+}
+
+pub fn agb_midi_core(args: TokenStream) -> TokenStream {
+    let input: MidiCoreInput = match syn::parse2(args.clone()) {
+        Ok(input) => input,
+        Err(e) => abort!(args, e),
+    };
+
+    let sf2_file = input.sf2_file.value();
+    let midi_file = input.midi_file.value();
+
+    let root = std::env::var("CARGO_MANIFEST_DIR").expect("Failed to get cargo manifest dir");
+    let sf2_file = Path::new(&root).join(&*sf2_file);
+    let midi_file = Path::new(&root).join(&*midi_file);
+
+    let sf2_include_path = sf2_file.to_string_lossy();
+    let midi_file_include_path = midi_file.to_string_lossy();
+
+    let midi_info = match MidiInfo::load_from_file(&sf2_file, &midi_file) {
+        Ok(track) => track,
+        Err(e) => abort!(args, e),
+    };
+
+    let parsed = parse_midi(&midi_info);
+
+    quote! {
+        {
+            const _: &[u8] = include_bytes!(#sf2_include_path);
+            const _: &[u8] = include_bytes!(#midi_file_include_path);
+
+            #parsed
+        }
+    }
+}
+
+pub struct MidiInfo {}
+
+impl MidiInfo {
+    pub fn load_from_file(sf2_file: &Path, midi_file: &Path) -> Result<Self, Box<dyn Error>> {
+        Ok(Self {})
+    }
+}
+
+pub fn parse_midi(midi_info: &MidiInfo) -> TokenStream {
+    quote! {}
+}
diff --git a/tracker/agb-midi/Cargo.toml b/tracker/agb-midi/Cargo.toml
new file mode 100644
index 00000000..a0060503
--- /dev/null
+++ b/tracker/agb-midi/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "agb_midi"
+version = "0.18.0"
+authors = ["Gwilym Inzani <gw@ilym.me>"]
+edition = "2021"
+license = "MPL-2.0"
+description = "Library for converting MIDI files for use with agb-tracker on the Game Boy Advance. You shouldn't use this package directly"
+repository = "https://github.com/agbrs/agb"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+agb_midi_core = { version = "0.18.0", path = "../agb-midi-core" }
+proc-macro-error = "1"
+proc-macro2 = "1"
diff --git a/tracker/agb-midi/src/lib.rs b/tracker/agb-midi/src/lib.rs
new file mode 100644
index 00000000..37429939
--- /dev/null
+++ b/tracker/agb-midi/src/lib.rs
@@ -0,0 +1,8 @@
+use proc_macro::TokenStream;
+use proc_macro_error::proc_macro_error;
+
+#[proc_macro_error]
+#[proc_macro]
+pub fn include_xm(args: TokenStream) -> TokenStream {
+    agb_midi_core::agb_midi_core(args.into()).into()
+}
diff --git a/tracker/agb-tracker/Cargo.toml b/tracker/agb-tracker/Cargo.toml
index 03c46a66..33c8eda7 100644
--- a/tracker/agb-tracker/Cargo.toml
+++ b/tracker/agb-tracker/Cargo.toml
@@ -8,10 +8,12 @@ description = "Library for playing tracker music. Designed for use with the agb
 repository = "https://github.com/agbrs/agb"
 
 [features]
-default = ["xm"]
+default = ["xm", "midi"]
 xm = ["dep:agb_xm"]
+midi = ["dep:agb_midi"]
 
 [dependencies]
+agb_midi = { version = "0.18.1", path = "../agb-midi", optional = true }
 agb_xm = { version = "0.18.1", path = "../agb-xm", optional = true }
 agb = { version = "0.18.1", path = "../../agb" }
 agb_tracker_interop = { version = "0.18.1", path = "../agb-tracker-interop", default-features = false }