1 files changed, 65 insertions, 0 deletions

diff --git a/crates/ra_lsp_server/src/config.rs b/crates/ra_lsp_server/src/config.rs
new file mode 100644
index 000000000..a16cc292e
--- /dev/null
+++ b/crates/ra_lsp_server/src/config.rs
@@ -0,0 +1,65 @@
+use serde::{Deserialize, Deserializer};
+
+/// Client provided initialization options
+#[derive(Deserialize, Clone, Copy, Debug, PartialEq, Eq)]
+#[serde(rename_all = "camelCase", default)]
+pub struct ServerConfig {
+    /// Whether the client supports our custom highlighting publishing decorations.
+    /// This is different to the highlightingOn setting, which is whether the user
+    /// wants our custom highlighting to be used.
+    ///
+    /// Defaults to `false`
+    #[serde(deserialize_with = "nullable_bool_false")]
+    pub publish_decorations: bool,
+
+    /// Whether or not the workspace loaded notification should be sent
+    ///
+    /// Defaults to `true`
+    #[serde(deserialize_with = "nullable_bool_true")]
+    pub show_workspace_loaded: bool,
+
+    pub lru_capacity: Option<usize>,
+}
+
+impl Default for ServerConfig {
+    fn default() -> ServerConfig {
+        ServerConfig { publish_decorations: false, show_workspace_loaded: true, lru_capacity: None }
+    }
+}
+
+/// Deserializes a null value to a bool false by default
+fn nullable_bool_false<'de, D>(deserializer: D) -> Result<bool, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let opt = Option::deserialize(deserializer)?;
+    Ok(opt.unwrap_or(false))
+}
+
+/// Deserializes a null value to a bool true by default
+fn nullable_bool_true<'de, D>(deserializer: D) -> Result<bool, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let opt = Option::deserialize(deserializer)?;
+    Ok(opt.unwrap_or(true))
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn deserialize_init_options_defaults() {
+        // check that null == default for both fields
+        let default = ServerConfig::default();
+        assert_eq!(default, serde_json::from_str(r#"{}"#).unwrap());
+        assert_eq!(
+            default,
+            serde_json::from_str(
+                r#"{"publishDecorations":null, "showWorkspaceLoaded":null, "lruCapacity":null}"#
+            )
+            .unwrap()
+        );
+    }
+}