add idl build script

Author: samkim-crypto

Cargo.lock

@@ -34,6 +34,11 @@ solana-system-interface = "2"
 solana-transaction = "3.0.0"
 solana-transaction-error = "3.0.0"
 
+[build-dependencies]
+codama = "0.6.4"
+codama-korok-plugins = "0.6.4"
+serde_json = "1.0"
+
 [lib]
 crate-type = ["cdylib", "lib"]
 

program/Cargo.toml

@@ -0,0 +1,55 @@
+//! Codama IDL build script.
+
+use {
+    codama::Codama,
+    codama_korok_plugins::DefaultPlugin,
+    std::{env, fs, path::Path},
+};
+
+fn main() {
+    // Run the build script if the source files have changed, or if the
+    // developer provides the GENERATE_IDL environment variable.
+    //
+    // ```
+    // `GENERATE_IDL=1 cargo build`
+    // ```
+    //
+    // The environment variable approach is useful if the local Codama has been
+    // updated.
+    println!("cargo:rerun-if-changed=src/");
+    println!("cargo:rerun-if-env-changed=GENERATE_IDL");
+
+    if let Err(e) = generate_idl() {
+        println!("cargo:warning=Failed to generate IDL: {}", e);
+    }
+}
+
+fn generate_idl() -> Result<(), Box<dyn std::error::Error>> {
+    let manifest_dir = env::var("CARGO_MANIFEST_DIR")?;
+    let crate_path = Path::new(&manifest_dir);
+
+    let codama = Codama::load(crate_path)?
+        .without_default_plugin()
+        .add_plugin(DefaultPlugin); // Standard parsing
+
+    let idl_json = codama.get_json_idl()?;
+
+    // Parse and format the JSON with pretty printing.
+    let parsed: serde_json::Value = serde_json::from_str(&idl_json)?;
+    let mut formatted_json = serde_json::to_string_pretty(&parsed)?;
+
+    // Add newline at the end to match standard formatting.
+    formatted_json.push('\n');
+
+    // Define output directory
+    let out_dir = Path::new(&manifest_dir).join("idl");
+    fs::create_dir_all(&out_dir)?;
+
+    // Write to `spl_record.json`
+    let idl_path = out_dir.join("spl_record.json");
+    fs::write(&idl_path, formatted_json)?;
+
+    println!("cargo:warning=IDL written to: {}", idl_path.display());
+
+    Ok(())
+}