add Builder functions for including folder(s) and headers

Author: Aatif Syed

src/lib.rs

@@ -648,6 +648,33 @@ impl Builder {
         self
     }
 
+    /// Add multiple input C/C++ headers.
+    pub fn headers<T: AsRef<str>>(
+        mut self,
+        headers: impl IntoIterator<Item = T>,
+    ) -> Builder {
+        for path in headers {
+            self = self.header(path.as_ref());
+        }
+        self
+    }
+
+    /// Include a folder for system header file resolution
+    pub fn include(self, path: impl AsRef<str>) -> Builder {
+        self.clang_arg(format!("-I{}", path.as_ref()))
+    }
+
+    /// Include multiple folders for system header file resolution
+    pub fn includes<T: AsRef<str>>(
+        mut self,
+        paths: impl IntoIterator<Item = T>,
+    ) -> Builder {
+        for path in paths {
+            self = self.include(path);
+        }
+        self
+    }
+
     /// Add a depfile output which will be written alongside the generated bindings.
     pub fn depfile<H: Into<String>, D: Into<PathBuf>>(
         mut self,