Cross-platform builds

crates/pile-value/build.rs

@@ -1,7 +1,34 @@
 use std::env;
 use std::path::PathBuf;
 
-const PDFIUM_URL: &str = "https://github.com/bblanchon/pdfium-binaries/releases/download/chromium%2F7725/pdfium-linux-x64.tgz";
+const PDFIUM_VERSION: &str = "chromium%2F7725";
+
+fn pdfium_url(os: &str, arch: &str) -> String {
+	let platform = match (os, arch) {
+		("linux", "x86_64") => "linux-x64",
+		("linux", "aarch64") => "linux-arm64",
+		("macos", "x86_64") => "mac-x64",
+		("macos", "aarch64") => "mac-arm64",
+		_ => panic!("unsupported platform: {os}-{arch}"),
+	};
+	format!(
+		"https://github.com/bblanchon/pdfium-binaries/releases/download/{PDFIUM_VERSION}/pdfium-{platform}.tgz"
+	)
+}
+
+fn lib_name(os: &str) -> &'static str {
+	match os {
+		"macos" => "libpdfium.dylib",
+		_ => "libpdfium.so",
+	}
+}
+
+fn rpath_flag(os: &str) -> &'static str {
+	match os {
+		"macos" => "-Wl,-rpath,@loader_path",
+		_ => "-Wl,-rpath,$ORIGIN",
+	}
+}
 
 #[expect(clippy::expect_used)]
 #[expect(clippy::unwrap_used)]
@@ -13,6 +40,9 @@ fn main() {
 		return;
 	}
 
+	let os = env::var("CARGO_CFG_TARGET_OS").unwrap();
+	let arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
+
 	let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
 	// OUT_DIR is target/<profile>/build/<pkg>-<hash>/out
@@ -30,15 +60,17 @@ fn main() {
 		return;
 	}
 
-	let lib_path = profile_dir.join("libpdfium.so");
+	let lib_file = lib_name(&os);
+	let lib_path = profile_dir.join(lib_file);
 
 	if !lib_path.exists() {
+		let url = pdfium_url(&os, &arch);
 		let tgz_path = out_dir.join("pdfium.tgz");
 
-		eprintln!("cargo:warning=Downloading PDFium from {PDFIUM_URL}");
+		eprintln!("cargo:warning=Downloading PDFium from {url}");
 
 		let status = std::process::Command::new("curl")
-			.args(["-L", "--fail", "-o", tgz_path.to_str().unwrap(), PDFIUM_URL])
+			.args(["-L", "--fail", "-o", tgz_path.to_str().unwrap(), &url])
 			.status()
 			.expect("failed to run curl");
 		assert!(status.success(), "curl failed to download PDFium");
@@ -54,11 +86,11 @@ fn main() {
 			.expect("failed to run tar");
 		assert!(status.success(), "tar failed to extract PDFium");
 
-		std::fs::copy(out_dir.join("lib").join("libpdfium.so"), &lib_path)
-			.expect("failed to copy libpdfium.so");
+		std::fs::copy(out_dir.join("lib").join(lib_file), &lib_path)
+			.expect("failed to copy pdfium library");
 	}
 
 	println!("cargo:rustc-link-search=native={}", profile_dir.display());
 	println!("cargo:rustc-link-lib=dylib=pdfium");
-	println!("cargo:rustc-link-arg=-Wl,-rpath,$ORIGIN");
+	println!("cargo:rustc-link-arg={}", rpath_flag(&os));
 }

default.nix

@@ -42,7 +42,10 @@ pileRustPlatform.buildRustPackage {
 
   postInstall = ''
     wrapProgram $out/bin/pile \
-      --prefix LD_LIBRARY_PATH : ${pkgs.lib.makeLibraryPath [ pkgs.pdfium-binaries ]}
+      ${if pkgs.stdenv.isDarwin then
+        "--prefix DYLD_LIBRARY_PATH : ${pkgs.lib.makeLibraryPath [ pkgs.pdfium-binaries ]}"
+      else
+        "--prefix LD_LIBRARY_PATH : ${pkgs.lib.makeLibraryPath [ pkgs.pdfium-binaries ]}"}
   '';
 
   meta = {