Enable DocumentLink (#168)

Co-authored-by: star9029 <hengxings783@gmail.com>

include/Protocol/Feature/DocumentLink.h

@@ -4,8 +4,37 @@
 
 namespace clice::proto {
 
-struct DocumentLinkClientCapabilities {};
+struct DocumentLinkClientCapabilities {
+    /// Whether the client supports the `tooltip` property on `DocumentLink`.
+    bool tooltipSupport = false;
+};
 
-struct DocumentLinkOptions {};
+struct DocumentLinkOptions {
+    /// Document links have a resolve provider as well.
+    bool resolveProvider;
+};
+
+struct DocumentLinkParams {
+    /// The document to provide document links for.
+    TextDocumentIdentifier textDocument;
+};
+
+/// A document link is a range in a text document that links to an internal or
+/// external resource, like another text document or a web site.
+struct DocumentLink {
+    /// The range this link applies to.
+    Range range;
+
+    /// The uri this link points to. If missing a resolve request is sent later.
+    URI target;
+
+    /// The tooltip text when you hover over this link.
+    ///
+    /// If a tooltip is provided, is will be displayed in a string that includes
+    /// instructions on how to trigger the link, such as `{0} (ctrl + click)`.
+    /// The specific instructions vary depending on OS, user settings, and
+    /// localization.
+    /// FIXME: string tooltip;
+};
 
 }  // namespace clice::proto