split out ffi bindings into shenlong-sys crate

shenlong-sys/build.rs

@@ -0,0 +1,57 @@
+extern crate cc;
+extern crate pkg_config;
+extern crate bindgen;
+
+use cc::Build;
+use pkg_config::Library;
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let geany: Library = pkg_config::probe_library("geany").unwrap();
+    let mut build = Build::new();
+    add_pkg_config(&mut build, &geany); 
+    /*build.file("plugin.c")
+        .flag("-DGTK")
+        .flag("-pthread")
+        .compile("foo");*/
+    write_bindings(&geany);
+}
+
+// https://github.com/alexcrichton/cc-rs/issues/147#issue-216395683
+fn add_pkg_config(build: &mut Build, pkg: &Library) {
+    for p in pkg.include_paths.iter() {
+        build.include(p);
+    }
+    for p in pkg.link_paths.iter() {
+        build.flag(&format!("-L{:?}", p));
+    }
+    for p in pkg.libs.iter() {
+        build.flag(&format!("-l{}", p));
+    }
+    for p in pkg.framework_paths.iter() {
+        build.flag(&format!("-F{:?}", p));
+    }
+    for p in pkg.frameworks.iter() {
+        build.flag(&format!("-framework {}", p));
+    }
+}
+
+fn write_bindings(pkg: &Library) {
+	let mut bindings_builder = bindgen::Builder::default()
+        .header("wrapper.h")
+        .clang_arg("-DGTK")
+        .blacklist_function("geany_load_module");
+        
+    for p in pkg.include_paths.iter() {
+        bindings_builder = bindings_builder.clang_arg(format!("-I{}", p.to_str().unwrap()));
+    }
+    
+    let bindings = bindings_builder.generate()
+		.expect("Unable to generate bindings");
+	
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");	
+}