2 files changed, 28 insertions, 5 deletions
diff --git a/src/charset.rs b/src/charset.rs
index a79eddb..71e1e84 100644
--- a/src/charset.rs
+++ b/src/charset.rs
@@ -2,7 +2,8 @@ use std::cmp::Ordering;
 
 use serde::{Deserialize, Serialize};
 
-#[derive(Debug, Eq, PartialEq, Hash, Clone, Serialize, Deserialize, Default)]
+#[derive(Debug, Eq, PartialEq, Hash, Clone, Default, Serialize, Deserialize)]
+#[serde(into = "String", from = "CharsetSerializedEnum")]
 pub struct Charset(pub Vec<char>);
 
 impl Charset {
@@ -153,6 +154,28 @@ impl Charset {
     }
 }
 
+impl Into<String> for Charset {
+    fn into(self) -> String {
+        self.to_string()
+    }
+}
+
+#[derive(Deserialize)]
+#[serde(untagged)]
+enum CharsetSerializedEnum {
+    Array(Vec<char>),
+    Str(String),
+}
+
+impl From<CharsetSerializedEnum> for Charset {
+    fn from(s: CharsetSerializedEnum) -> Charset {
+        match s {
+            CharsetSerializedEnum::Array(a) => Charset::from_iter(a.into_iter()),
+            CharsetSerializedEnum::Str(s) => Charset::new(&s),
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
diff --git a/src/main.rs b/src/main.rs
index 9e08418..4addd02 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -88,7 +88,7 @@ fn main() {
             let mut batches: Vec<Batch> = fs::read("data/batches.json")
                 .map_err(anyhow::Error::from)
                 .and_then(|x| Ok(serde_json::from_slice(&x)?))
-                .unwrap_or_default();
+                .expect("failed to decode batches.json");
             for batch in batches.iter_mut() {
                 simplify_batch(batch);
             }
@@ -104,7 +104,7 @@ fn main() {
             let mut batches: Vec<Batch> = fs::read("data/batches.json")
                 .map_err(anyhow::Error::from)
                 .and_then(|x| Ok(serde_json::from_slice(&x)?))
-                .unwrap_or_default();
+                .expect("failed to decode batches.json");
             let kanji_levels = read_kanji_levels().expect("read_kanji_levels");
             let kanji_levels = kanji_levels
                 .into_iter()
@@ -123,7 +123,7 @@ fn main() {
             let mut batches: Vec<Batch> = fs::read("data/batches.json")
                 .map_err(anyhow::Error::from)
                 .and_then(|x| Ok(serde_json::from_slice(&x)?))
-                .unwrap_or_default();
+                .expect("failed to decode batches.json");
             let jlpt_vocab = load_jlpt_vocab().expect("load_jlpt_vocab");
             add_vocab(&mut batches, &jlpt_vocab);
             fs::write(
@@ -150,7 +150,7 @@ fn main() {
             let mut batches: Vec<Batch> = fs::read("data/batches.json")
                 .map_err(anyhow::Error::from)
                 .and_then(|x| Ok(serde_json::from_slice(&x)?))
-                .unwrap_or_default();
+                .expect("failed to decode batches.json");
 
             add_examples(&mut batches, &ex);