convert from lsdpack output source

Cargo.lock

@@ -14,6 +14,12 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6559b8c3065745016f5cc2d1095273fe8a175e953c976426947ad828d6ba6fda"
 
+[[package]]
+name = "build_const"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4ae4235e6dac0694637c763029ecea1a2ec9e4e06ec2729bd21ba4d9c863eb7"
+
 [[package]]
 name = "gba"
 version = "0.11.3"
@@ -29,7 +35,9 @@ dependencies = [
 name = "gba-template"
 version = "0.1.0"
 dependencies = [
+ "build_const",
  "gba",
+ "voladdress",
 ]
 
 [[package]]

Cargo.toml

@@ -6,4 +6,10 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+build_const = { version = "0.2.2", default-features = false }
 gba = "0.11.3"
+#once_cell = { version = "1.19.0", default-features = false }
+voladdress = "*"
+
+[build-dependencies]
+build_const = "0.2.2"

build.rs

@@ -0,0 +1,34 @@
+use build_const::ConstWriter;
+
+const SONG_SOURCE: &str = include_str!("lsdpack.s");
+
+fn main() {
+    let mut consts = ConstWriter::for_build("lsdpack_bc")
+        .unwrap()
+        .finish_dependencies();
+    let bytes: Vec<u8> = SONG_SOURCE
+        .lines()
+        .map(|s| s.trim().strip_prefix("DB "))
+        .flatten() // filter to lines starting with DB
+        .map(|s| {
+            s.split_once(';')
+                .unwrap_or((s, ""))
+                .0 // remove comments
+                .chars()
+                .filter(|c| *c == ',' || c.is_ascii_hexdigit()) // remove spaces and dollars
+                .collect::<String>()
+                .split(',')
+                .map(|s| u8::from_str_radix(s, 16).unwrap())
+                .collect::<Vec<u8>>()
+        })
+        .flatten() // merge iterator of vectors
+        .collect();
+    let song_positions: Vec<usize> = SONG_SOURCE
+        .lines()
+        .map(|s| s.trim().strip_prefix("dw "))
+        .flatten() // filter to lines from SongLocations
+        .map(|s| usize::from_str_radix(s.split_once('$').unwrap().1, 16).unwrap() - 0x4000)
+        .collect();
+    consts.add_array("LSDPACK_DATA", "u8", &bytes);
+    consts.add_array("LSDPACK_SONG_POSITIONS", "usize", &song_positions);
+}