feat(preprocessor): implement the serde feature (#179)

Now, we are able to serialize/deserialize the command enum.

engine/preprocessor/Cargo.toml

@@ -14,7 +14,12 @@ authors = ["Brady Fomegne <[email protected]>"]
 [features]
 default = []
 inhibit = []
+serde = ["dep:serde", "keyboard-types/serde"]
 
 [dependencies]
-keyboard-types = "0.7.0"
+keyboard-types = { version = "0.7.0", default-features = false }
 afrim-memory = { version = "0.3.2", path = "../../memory" }
+serde = { version = "1.0.197", features = ["derive"], optional = true }
+
+[dev-dependencies]
+keyboard-types = { version = "0.7.0", features = ["webdriver"] }

engine/preprocessor/src/message.rs

@@ -2,6 +2,7 @@
 
 /// Possible commands that can be generated by the `afrim-preprocessor`.
 #[derive(Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum Command {
     /// Request to commit a text.
     CommitText(String),