From 3a91ef772d3ff10e0aa2e116c03d1b9ba2692942 Mon Sep 17 00:00:00 2001
From: Logan Darklock <logandarklock@gmail.com>
Date: Fri, 22 Jan 2021 16:45:11 -0800
Subject: [PATCH] Building a Config cannot fail

---
 src/config.rs | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/config.rs b/src/config.rs
index e9e11f1..603ba85 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -27,12 +27,13 @@ use glutin::dpi::LogicalSize;
 ///
 /// let config = ConfigBuilder::default()
 ///     .invert_y(false)
-///     .build().unwrap();
+///     .build();
 /// ```
 ///
 /// If there's a config option you want to see or think is missing, please open an issue!
 #[non_exhaustive]
 #[builder(default)]
+#[builder(build_fn(skip))]
 #[derive(Clone, PartialEq, Debug, Builder)]
 pub struct Config {
     /// Sets the pixel dimensions of the buffer. The buffer will automatically stretch to fill the
@@ -54,6 +55,28 @@ pub struct Config {
     pub invert_y: bool
 }
 
+impl ConfigBuilder {
+    /// Builds a new [`Config`].
+    pub fn build(&self) -> Config {
+        let mut config = Config::default();
+
+        macro_rules! fields {
+            ($($n:ident),+) => {
+                $(
+                if let Some($n) = &self.$n {
+                    config.$n = $n.clone();
+                }
+                )+
+            }
+        }
+
+        // I guess this is better than implementing the entire builder by hand
+        fields!(buffer_size, resizable, window_title, window_size, invert_y);
+
+        config
+    }
+}
+
 impl Default for Config {
     fn default() -> Self {
         Config {