Use cbindgen library instead of CLI (#2)

* add cbindgen to build dependencies

* use cbindgen rust-style rather then via command

* comment out doc length line which causes error

Couldn't parse config file: unknown field `documentation_length`

Cargo.toml

@@ -20,5 +20,8 @@ log = { version = "0.4.17" }
 [dev-dependencies]
 rand = { version = "*" }
 
+[build-dependencies]
+cbindgen = "0.20.0"
+
 [lib]
 crate-type = ["staticlib"]

build.rs

@@ -1,19 +1,11 @@
 // Jackson Coxson
-
-use std::process::Command;
+use std::env;
+use cbindgen;
 
 fn main() {
-    // Generate the cbindings
-    let _ = if cfg!(target_os = "windows") {
-        Command::new("cmd")
-            .args(["/C", "cbindgen -c cbindgen.toml -o em_proxy.h"])
-            .output()
-            .expect("Failed to generate c bindings")
-    } else {
-        Command::new("sh")
-            .arg("-c")
-            .arg("cbindgen -c cbindgen.toml -o em_proxy.h")
-            .output()
-            .expect("Failed to generate c bindings")
-    };
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    cbindgen::generate(crate_dir)
+      .expect("Unable to generate C bindings")
+      .write_to_file("em_proxy.h");
 }

cbindgen.toml

@@ -28,7 +28,7 @@ line_length = 500
 tab_width = 2
 documentation = true
 documentation_style = "auto"
-documentation_length = "full"
+#documentation_length = "full"
 line_endings = "LF" # also "CR", "CRLF", "Native"