100 exercises to learn Rust

exercises/05_ticket_v2/14_source/src/status.rs

@@ -0,0 +1,46 @@
+#[derive(Debug, PartialEq, Clone)]
+pub enum Status {
+    ToDo,
+    InProgress,
+    Done,
+}
+
+impl TryFrom<String> for Status {
+    type Error = ParseStatusError;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        let value = value.to_lowercase();
+        match value.as_str() {
+            "todo" => Ok(Status::ToDo),
+            "inprogress" => Ok(Status::InProgress),
+            "done" => Ok(Status::Done),
+            _ => Err(ParseStatusError {
+                invalid_status: value,
+            }),
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+#[error("`{invalid_status}` is not a valid status. Use one of: ToDo, InProgress, Done")]
+pub struct ParseStatusError {
+    invalid_status: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::convert::TryFrom;
+
+    #[test]
+    fn test_try_from_string() {
+        let status = Status::try_from("ToDO".to_string()).unwrap();
+        assert_eq!(status, Status::ToDo);
+
+        let status = Status::try_from("inproGress".to_string()).unwrap();
+        assert_eq!(status, Status::InProgress);
+
+        let status = Status::try_from("Done".to_string()).unwrap();
+        assert_eq!(status, Status::Done);
+    }
+}