feat: add support for homebrew on mac M1

build.rs

@@ -3,9 +3,7 @@ use std::{
     path::{Path, PathBuf},
 };
 
-fn find_package(name: &str) -> Vec<PathBuf> {
+fn link_vcpkg(mut path: PathBuf, name: &str) -> PathBuf {
-    let vcpkg_root = std::env::var("VCPKG_ROOT").unwrap();
-    let mut path: PathBuf = vcpkg_root.into();
     let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
     let mut target_arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
     if target_arch == "x86_64" {
@@ -28,7 +26,10 @@ fn find_package(name: &str) -> Vec<PathBuf> {
     path.push(target);
     println!(
         "{}",
-        format!("cargo:rustc-link-lib=static={}", name.trim_start_matches("lib"))
+        format!(
+            "cargo:rustc-link-lib=static={}",
+            name.trim_start_matches("lib")
+        )
     );
     println!(
         "{}",
@@ -39,7 +40,66 @@ fn find_package(name: &str) -> Vec<PathBuf> {
     );
     let include = path.join("include");
     println!("{}", format!("cargo:include={}", include.to_str().unwrap()));
-    vec![include]
+    include
+}
+
+fn link_homebrew_m1(name: &str) -> PathBuf {
+    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
+    let target_arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
+    if target_os != "macos" || target_arch != "aarch64" {
+        panic!("Couldn't find VCPKG_ROOT, also can't fallback to homebrew because it's only for macos aarch64.");
+    }
+    let mut path = PathBuf::from("/opt/homebrew/Cellar");
+    path.push(name);
+    let entries = if let Ok(dir) = std::fs::read_dir(&path) {
+        dir
+    } else {
+        panic!("Could not find package in {}. Make sure your homebrew and package {} are all installed.", path.to_str().unwrap(),&name);
+    };
+    let mut directories = entries
+        .into_iter()
+        .filter(|x| x.is_ok())
+        .map(|x| x.unwrap().path())
+        .filter(|x| x.is_dir())
+        .collect::<Vec<_>>();
+    // Find the newest version.
+    directories.sort_unstable();
+    if directories.is_empty() {
+        panic!(
+            "There's no installed version of {} in /opt/homebrew/Cellar",
+            name
+        );
+    }
+    path.push(directories.pop().unwrap());
+    // Link the library.
+    println!(
+        "{}",
+        format!(
+            "cargo:rustc-link-lib=static={}",
+            name.trim_start_matches("lib")
+        )
+    );
+    // Add the library path.
+    println!(
+        "{}",
+        format!(
+            "cargo:rustc-link-search={}",
+            path.join("lib").to_str().unwrap()
+        )
+    );
+    // Add the include path.
+    let include = path.join("include");
+    println!("{}", format!("cargo:include={}", include.to_str().unwrap()));
+    include
+}
+
+fn find_package(name: &str) -> Vec<PathBuf> {
+    if let Ok(vcpkg_root) = std::env::var("VCPKG_ROOT") {
+        vec![link_vcpkg(vcpkg_root.into(), name)]
+    } else {
+        // Try using homebrew
+        vec![link_homebrew_m1(name)]
+    }
 }
 
 fn generate_bindings(ffi_header: &Path, include_paths: &[PathBuf], ffi_rs: &Path) {