[niepce] rust: cleanup cbindgen build

[Hubert Figuière <hub src gnome org>]

commit 55653d3f92176f4a4ab3bb285bb09301c4a04abb
Author: Hubert Figuière <hub figuiere net>
Date:   Sun Jan 5 14:41:56 2020 -0500

    rust: cleanup cbindgen build

 build.rs                   | 13 +++++--------
 crates/npc-engine/build.rs | 13 +++++--------
 crates/npc-fwk/build.rs    | 13 +++++--------
 3 files changed, 15 insertions(+), 24 deletions(-)
---
diff --git a/build.rs b/build.rs
index 15b01e2..32c3d8c 100644
--- a/build.rs
+++ b/build.rs
@@ -10,7 +10,7 @@ fn main() {
         let target_dir = env::var("CARGO_TARGET_DIR").unwrap_or(String::from("./target"));
         let mut target_file = PathBuf::from(target_dir);
         target_file.push("bindings.h");
-        let cbuilder = cbindgen::Builder::new()
+        cbindgen::Builder::new()
             .with_include_guard("niepce_rust_bindings_h")
             .with_namespace("ffi")
             .with_language(cbindgen::Language::Cxx)
@@ -20,12 +20,9 @@ fn main() {
             .exclude_item("GtkToolbar")
             .exclude_item("GFileInfo")
             .exclude_item("RgbColour")
-            .with_crate(&crate_dir);
-
-        if let Ok(bindings) = cbuilder.generate() {
-            bindings.write_to_file(&*target_file.to_string_lossy());
-        } else {
-            println!("Couldn't generate bindings");
-        }
+            .with_crate(&crate_dir)
+            .generate()
+            .expect("Couldn't generate bindings")
+            .write_to_file(&target_file);
     }
 }
diff --git a/crates/npc-engine/build.rs b/crates/npc-engine/build.rs
index 245c7d1..7051f65 100644
--- a/crates/npc-engine/build.rs
+++ b/crates/npc-engine/build.rs
@@ -62,7 +62,7 @@ fn main() {
         let target_dir = env::var("CARGO_TARGET_DIR").unwrap_or(String::from("./target"));
         let mut target_file = PathBuf::from(target_dir);
         target_file.push("eng_bindings.h");
-        let cbuilder = cbindgen::Builder::new()
+        cbindgen::Builder::new()
             .with_include_guard("niepce_rust_eng_bindings_h")
             .with_namespace("ffi")
             .with_language(cbindgen::Language::Cxx)
@@ -72,12 +72,9 @@ fn main() {
             .exclude_item("GtkToolbar")
             .exclude_item("GFileInfo")
             .exclude_item("RgbColour")
-            .with_crate(&crate_dir);
-
-        if let Ok(bindings) = cbuilder.generate() {
-            bindings.write_to_file(&*target_file.to_string_lossy());
-        } else {
-            println!("Couldn't generate bindings");
-        }
+            .with_crate(&crate_dir)
+            .generate()
+            .expect("Couldn't generate bindings")
+            .write_to_file(&*target_file.to_string_lossy());
     }
 }
diff --git a/crates/npc-fwk/build.rs b/crates/npc-fwk/build.rs
index 7254026..0126961 100644
--- a/crates/npc-fwk/build.rs
+++ b/crates/npc-fwk/build.rs
@@ -10,7 +10,7 @@ fn main() {
         let target_dir = env::var("CARGO_TARGET_DIR").unwrap_or(String::from("./target"));
         let mut target_file = PathBuf::from(target_dir);
         target_file.push("fwk_bindings.h");
-        let cbuilder = cbindgen::Builder::new()
+        cbindgen::Builder::new()
             .with_include_guard("niepce_fwk_rust_bindings_h")
             .with_namespace("ffi")
             .with_language(cbindgen::Language::Cxx)
@@ -19,12 +19,9 @@ fn main() {
             .exclude_item("GtkWindow")
             .exclude_item("GtkToolbar")
             .exclude_item("GFileInfo")
-            .with_crate(&crate_dir);
-
-        if let Ok(bindings) = cbuilder.generate() {
-            bindings.write_to_file(&*target_file.to_string_lossy());
-        } else {
-            println!("Couldn't generate bindings");
-        }
+            .with_crate(&crate_dir)
+            .generate()
+            .expect("Unable to generate bindings")
+            .write_to_file(&target_file);
     }
 }