feat: option_string

Author: robjtede

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Add `option_string()` function.
 - Add `vec_string()` function.
 
 ## 0.1.0

src/lib.rs

@@ -10,7 +10,7 @@ mod string_non_empty;
 mod vec_string;
 
 pub use crate::{
-    string::string,
+    string::{option_string, string},
     string_non_empty::{option_string_non_empty, string_non_empty},
     vec_string::vec_string,
 };

src/string.rs

@@ -7,6 +7,12 @@ pub fn string<'a, D: Deserializer<'a>>(de: D) -> Result<String, D::Error> {
     String::deserialize(de).map(|val| val.trim().to_owned())
 }
 
+/// Trims optional string during deserialization.
+pub fn option_string<'a, D: Deserializer<'a>>(de: D) -> Result<Option<String>, D::Error> {
+    let val = Option::<String>::deserialize(de)?;
+    Ok(val.map(|val| val.trim().to_owned()))
+}
+
 #[cfg(test)]
 mod tests {
     use serde::Deserialize;