can automatically find brew's openssl

looking up /usr/local/Cellar/openssl@1.1/1.1.1x

where x is any letter in 'a'..'i'

1 files changed, 51 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..619ad4c
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,51 @@
+use std::path::PathBuf;
+
+fn main() {
+    //let crate_root: PathBuf = env::var("CARGO_MANIFEST_DIR").unwrap().into();
+    /*let tdlib_path: PathBuf = {
+        env::var("TDLIB_LIBRARY_PATH")
+            .map_or_else(|_err| crate_root.join("td/build"), PathBuf::from)
+    };*/
+
+    if cfg!(not(feature = "tdlib-provided")) {
+        build_tdlib();
+    }
+}
+
+fn build_tdlib() {
+    let mut config = cmake::Config::new("td");
+    config.very_verbose(true);
+
+    if cfg!(not(feature = "openssl-provided")) {
+        let openssl = guess_openssl_location();
+        config.define("OPENSSL_ROOT_DIR", openssl);
+    }
+
+    let dst = config.build();
+    println!("cargo:rustc-link-search={}", dst.display()); // tdlib_path.to_string_lossy());
+}
+
+fn guess_openssl_location() -> PathBuf {
+    let mut openssl: Option<PathBuf> = std::env::var("OPENSSL_ROOT_DIR")
+        .map(std::convert::Into::into)
+        .ok();
+
+    if cfg!(target_os = "macos") && openssl.is_none() {
+        let ssl_very_minor_version = "abcdefghi";
+        for ver in ssl_very_minor_version.chars().rev() {
+            let maybe_path = PathBuf::from(format!("/usr/local/Cellar/openssl@1.1/1.1.1{}", ver));
+            if maybe_path.is_dir() {
+                openssl = Some(maybe_path);
+                break;
+            }
+        }
+    }
+
+    openssl.expect(indoc::indoc! {r#"
+        Could not find openssl.
+        You must either use feature \"openssl-provided\"
+        or provide "OPENSSL_ROOT_DIR" env variable, so tdlib-sys can build
+        TDLib from sources.
+        "#
+    })
+}