Generate the right symlink for lumol.so

Author: Guillaume Fraux

.gitignore

@@ -1,2 +1,3 @@
 target
 Cargo.lock
+lumol.so

Cargo.toml

@@ -2,6 +2,7 @@
 name = "lumol-py"
 version = "0.1.0"
 authors = ["Guillaume Fraux <guillaume.fraux@ens.fr>"]
+build = "build.rs"
 
 [dependencies]
 lumol = {git = "https://github.com/lumol-org/lumol", rev = "11503ea"}

build.rs

@@ -0,0 +1,41 @@
+use std::env;
+use std::path::{Path, PathBuf};
+use std::io::Result;
+use std::fs;
+
+#[cfg(unix)]
+fn symlink<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> Result<()> {
+    use std::os::unix::fs;
+    return fs::symlink(src, dst);
+}
+
+#[cfg(windows)]
+fn symlink<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> Result<()> {
+    use std::os::windws::fs;
+    return fs::symlink_file(src, dst);
+}
+
+fn dynlib_ext() -> &'static str {
+    if cfg!(target_os="macos") {
+        ".dylib"
+    } else if cfg!(target_os="linux") {
+        ".so"
+    } else if cfg!(windows) {
+        ".dll"
+    } else {
+        panic!("Missing dynamic library extension for this platform. Please edit 'build.rs'");
+    }
+}
+
+fn main() {
+    let profile = env::var("PROFILE").unwrap();
+    let libname = String::from("liblumol_py") + dynlib_ext();
+    let library = PathBuf::from("target").join(profile).join(libname);
+    let link = Path::new("./lumol.so");
+
+    if link.symlink_metadata().is_ok() {
+        fs::remove_file(link).expect("Could not remove symbolic link");
+    }
+
+    symlink(library, link).expect("Could not create symbolic link");
+}