Add example for toml and duration

.github/workflows/test.yml

@@ -24,6 +24,7 @@ jobs:
           nix develop -c cargo run --no-default-features --example json
           nix develop -c cargo run --no-default-features --example rename-patch-struct
           nix develop -c cargo run --no-default-features --example patch-attr
+          nix develop -c cargo run --no-default-features --example time
           nix develop -c cargo test --no-default-features
 
       - name: Test with std features

struct-patch/Cargo.toml

@@ -17,6 +17,8 @@ struct-patch-derive = { version = "=0.8.5", path = "../struct-patch-derive" }
 serde_json = "1.0"
 serde = { version = "1", features = ["derive"] }
 serde_with = "3.9.0"
+toml = "0.8.19"
+humantime-serde = "1.1.1"
 
 [features]
 default = ["status", "op"]

struct-patch/examples/time.rs

@@ -0,0 +1,34 @@
+use serde::{Deserialize};
+use std::time::Duration;
+use struct_patch::Patch;
+
+#[derive(Deserialize, Clone, Debug, Patch)]
+#[patch(name = "FileConfig", attribute(derive(Deserialize, Debug)))]
+struct Config {
+    #[serde(with = "humantime_serde")]
+    #[patch(attribute(serde(with = "humantime_serde")))]
+    time: Duration,
+}
+
+fn main() {
+    let config = Config {
+        time: Duration::from_millis(500),
+    };
+
+    let patch: FileConfig = toml::from_str("time = \"200ms\"").unwrap();
+
+    let mut patched = config.clone();
+    patched.apply(patch);
+    assert_eq!(patched.time, Duration::from_millis(200));
+
+    // NOTE
+    // Following code does not work, because `humantime_serde` does not allow `Option<>` field
+    // anymore.
+    // https://github.com/jean-airoldie/humantime-serde/issues/13
+    //
+    // let empty_patch: FileConfig = toml::from_str("").unwrap();
+
+    // let mut patched = config.clone();
+    // patched.apply(empty_patch);
+    // assert_eq!(patched.time, Duration::from_millis(500));
+}