globset: permit deserializing Glob from String

Closes #2386, Closes #2388

crates/globset/src/serde_impl.rs

@@ -1,5 +1,7 @@
-use serde::de::Error;
-use serde::{Deserialize, Deserializer, Serialize, Serializer};
+use serde::{
+    de::{Error, Visitor},
+    {Deserialize, Deserializer, Serialize, Serializer},
+};
 
 use crate::Glob;
 
@@ -12,19 +14,67 @@ impl Serialize for Glob {
     }
 }
 
+struct GlobVisitor;
+
+impl<'a> Visitor<'a> for GlobVisitor {
+    type Value = Glob;
+
+    fn expecting(
+        &self,
+        formatter: &mut std::fmt::Formatter,
+    ) -> std::fmt::Result {
+        formatter.write_str("a glob pattern")
+    }
+
+    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Glob::new(v).map_err(serde::de::Error::custom)
+    }
+}
+
 impl<'de> Deserialize<'de> for Glob {
     fn deserialize<D: Deserializer<'de>>(
         deserializer: D,
     ) -> Result<Self, D::Error> {
-        let glob = <&str as Deserialize>::deserialize(deserializer)?;
-        Glob::new(glob).map_err(D::Error::custom)
+        deserializer.deserialize_str(GlobVisitor)
     }
 }
 
 #[cfg(test)]
 mod tests {
+    use std::collections::HashMap;
+
     use crate::Glob;
 
+    #[test]
+    fn glob_deserialize_borrowed() {
+        let string = r#"{"markdown": "*.md"}"#;
+
+        let map: HashMap<String, Glob> =
+            serde_json::from_str(&string).unwrap();
+        assert_eq!(map["markdown"], Glob::new("*.md").unwrap());
+    }
+
+    #[test]
+    fn glob_deserialize_owned() {
+        let string = r#"{"markdown": "*.md"}"#;
+
+        let v: serde_json::Value = serde_json::from_str(&string).unwrap();
+        let map: HashMap<String, Glob> = serde_json::from_value(v).unwrap();
+        assert_eq!(map["markdown"], Glob::new("*.md").unwrap());
+    }
+
+    #[test]
+    fn glob_deserialize_error() {
+        let string = r#"{"error": "["}"#;
+
+        let map = serde_json::from_str::<HashMap<String, Glob>>(&string);
+
+        assert!(map.is_err());
+    }
+
     #[test]
     fn glob_json_works() {
         let test_glob = Glob::new("src/**/*.rs").unwrap();