feat: allow Rust build when using the shared library

Author: ABeltramo

bindings/rust/Cargo.toml

@@ -1,10 +1,13 @@
 [package]
 name = "inputtino"
-version = "0.1.0"
+version = "2024.8.1"
 edition = "2021"
 license = "MIT"
 rust-version = "1.72"
 links = "libinputtino"
+homepage = "https://github.com/games-on-whales/inputtino"
+authors = ["ABeltramo"]
+description = "Rust bindings for inputtino"
 
 [lib]
 name = "inputtino_rs"
@@ -13,6 +16,7 @@ path = "src/lib.rs"
 [build-dependencies]
 bindgen = "0.69.4"
 cmake = "0.1"
+pkg-config = "0.3.30"
 
 [dev-dependencies]
 input = "0.9.0"

bindings/rust/build.rs

@@ -1,64 +1,68 @@
 extern crate bindgen;
+extern crate pkg_config;
 
 use std::env;
 use std::path::PathBuf;
 
 use cmake::Config;
 
 fn main() {
-    let build_static = false;
+    // Options
+    let build_c_bindings = env::var("INPUTTINO_BUILD_C_BINDINGS").unwrap_or("FALSE".to_string()) == "TRUE";
+    let build_static = env::var("INPUTTINO_BUILD_STATIC").unwrap_or("FALSE".to_string()) == "TRUE";
 
-    // This is the directory where the `c` library is located.
-    let libdir_path = PathBuf::from("../../")
-        // Canonicalize the path as `rustc-link-search` requires an absolute
-        // path.
-        .canonicalize()
-        .expect("cannot canonicalize path");
+    // The bindgen::Builder is the main entry point
+    // to bindgen, and lets you build up options for
+    // the resulting bindings.
+    let mut bindings = bindgen::Builder::default()
+        .use_core()
+        .default_enum_style(bindgen::EnumVariation::Rust {
+            non_exhaustive: false,
+        })
+        // Set the INPUTTINO_STATIC_DEFINE macro
+        .clang_arg(if build_static { "-D INPUTTINO_STATIC_DEFINE=1" } else { "" })
+        // The input header we would like to generate bindings for.
+        .header("wrapper.hpp");
 
-    // Compile the library using CMake
-    let dst = Config::new(libdir_path)
-        .target("libinputtino")
-        .define("BUILD_SHARED_LIBS", if build_static { "OFF" } else { "ON" })
-        .define("LIBINPUTTINO_INSTALL", "ON")
-        .define("BUILD_TESTING", "OFF")
-        .define("BUILD_SERVER", "OFF")
-        .define("BUILD_C_BINDINGS", "ON")
-        .profile("Release")
-        .define("CMAKE_CONFIGURATION_TYPES", "Release")
-        .build();
+    if build_c_bindings {
+        let libdir_path = PathBuf::from("../../")
+            // Canonicalize the path as `rustc-link-search` requires an absolute
+            // path.
+            .canonicalize()
+            .expect("cannot canonicalize path");
+
+        // Compile the library using CMake
+        let dst = Config::new(libdir_path)
+            .target("libinputtino")
+            .define("BUILD_SHARED_LIBS", if build_static { "OFF" } else { "ON" })
+            .define("LIBINPUTTINO_INSTALL", "ON")
+            .define("BUILD_TESTING", "OFF")
+            .define("BUILD_SERVER", "OFF")
+            .define("BUILD_C_BINDINGS", "ON")
+            .profile("Release")
+            .define("CMAKE_CONFIGURATION_TYPES", "Release")
+            .build();
+
+        println!("cargo:rustc-link-search=native={}/lib", dst.display());
+        bindings = bindings.clang_arg(format!("-I{}/include/", dst.display()))
+    } else {
+        let lib = pkg_config::probe_library("libinputtino").unwrap();
+        bindings = bindings.clang_arg(format!("-I{}", lib.include_paths[0].display()));
+    }
 
     // Dependencies
     if !build_static {
         println!("cargo:rustc-link-lib=evdev");
         println!("cargo:rustc-link-lib=stdc++");
     }
 
-    //libinputtino
-    println!("cargo:rustc-link-search=native={}/lib", dst.display());
     println!("cargo:rustc-link-lib={}libinputtino", if build_static { "static=" } else { "" });
 
-    // The bindgen::Builder is the main entry point
-    // to bindgen, and lets you build up options for
-    // the resulting bindings.
-    let bindings = bindgen::Builder::default()
-        .use_core()
-        .default_enum_style(bindgen::EnumVariation::Rust {
-            non_exhaustive: false,
-        })
-        // Add the include directory
-        .clang_arg(format!("-I{}/include/", dst.display()))
-        // Set the INPUTTINO_STATIC_DEFINE macro
-        .clang_arg(if build_static {"-D INPUTTINO_STATIC_DEFINE=1"} else {""})
-        // The input header we would like to generate bindings for.
-        .header("wrapper.hpp")
-        // Finish the builder and generate the bindings.
-        .generate()
-        // Unwrap the Result and panic on failure.
-        .expect("Unable to generate bindings");
+    let out = bindings.generate().expect("Unable to generate bindings");
 
     // Write the bindings to the $OUT_DIR/bindings.rs file.
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("bindings.rs");
-    bindings
+    out
         .write_to_file(out_path)
         .expect("Couldn't write bindings!");
 }