1 files changed, 45 insertions, 0 deletions
diff --git a/src/de.rs b/src/de.rs
new file mode 100644
index 0000000..47ad83a
--- /dev/null
+++ b/src/de.rs
@@ -0,0 +1,45 @@
+/// Convert an h:m:s string to a Duration
+pub mod hms_duration {
+    use std::num::ParseIntError;
+    use std::time::Duration;
+
+    use serde::de::Error;
+    use serde::Deserialize;
+    use serde::Deserializer;
+    use serde::Serializer;
+
+    pub fn serialize<S>(duration: &Duration, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let secs = duration.as_secs();
+        let hours = secs / 3600;
+        let minutes = (secs % 3600) / 60;
+        let seconds = secs % 60;
+        let s = if hours > 0 {
+            format!("{hours:0>2}:{minutes:0>2}:{seconds:0>2}")
+        } else {
+            format!("{minutes:0>2}:{seconds:0>2}")
+        };
+        serializer.serialize_str(&s)
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<Duration, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        from_string(s).map_err(Error::custom)
+    }
+
+    pub fn from_string(s: String) -> Result<Duration, ParseIntError> {
+        let mut total_seconds = 0;
+        let mut mult = 1;
+        for x in s.rsplit(":") {
+            let t: u64 = x.parse()?;
+            total_seconds += t * mult;
+            mult *= 60;
+        }
+        Ok(Duration::from_secs(total_seconds))
+    }
+}