lspclient: consider some additional server capabilities

addons/lspclient/lspclientprotocol.h

@@ -21,6 +21,8 @@
 #include <KTextEditor/Cursor>
 #include <KTextEditor/Range>
 
+#include <optional>
+
 // Following types roughly follow the types/interfaces as defined in LSP protocol spec
 // although some deviation may arise where it has been deemed useful
 // Moreover, to avoid introducing a custom 'optional' type, absence of an optional
@@ -51,6 +53,16 @@ struct LSPResponseError {
 
 enum class LSPDocumentSyncKind { None = 0, Full = 1, Incremental = 2 };
 
+struct LSPSaveOptions {
+    bool includeText = false;
+};
+
+// only used parts for now
+struct LSPTextDocumentSyncOptions {
+    LSPDocumentSyncKind change = LSPDocumentSyncKind::None;
+    std::optional<LSPSaveOptions> save;
+};
+
 struct LSPCompletionOptions {
     bool provider = false;
     bool resolveProvider = false;
@@ -81,7 +93,7 @@ struct LSPWorkspaceFoldersServerCapabilities {
 };
 
 struct LSPServerCapabilities {
-    LSPDocumentSyncKind textDocumentSync = LSPDocumentSyncKind::None;
+    LSPTextDocumentSyncOptions textDocumentSync;
     bool hoverProvider = false;
     LSPCompletionOptions completionProvider;
     LSPSignatureHelpOptions signatureHelpProvider;

addons/lspclient/lspclientserver.cpp

@@ -344,8 +344,15 @@ static void from_json(LSPServerCapabilities &caps, const QJsonObject &json)
     };
 
     auto sync = json.value(QStringLiteral("textDocumentSync"));
-    caps.textDocumentSync = static_cast<LSPDocumentSyncKind>(
+    caps.textDocumentSync.change = static_cast<LSPDocumentSyncKind>(
         (sync.isObject() ? sync.toObject().value(QStringLiteral("change")) : sync).toInt(static_cast<int>(LSPDocumentSyncKind::None)));
+    if (sync.isObject()) {
+        auto syncObject = sync.toObject();
+        auto save = syncObject.value(QStringLiteral("save"));
+        if (save.isObject() || save.toBool()) {
+            caps.textDocumentSync.save = {save.toObject().value(QStringLiteral("includeText")).toBool()};
+        }
+    }
     caps.hoverProvider = toBoolOrObject(json.value(QStringLiteral("hoverProvider")));
     from_json(caps.completionProvider, json.value(QStringLiteral("completionProvider")));
     from_json(caps.signatureHelpProvider, json.value(QStringLiteral("signatureHelpProvider")));

addons/lspclient/lspclientservermanager.cpp

@@ -931,7 +931,7 @@ private:
         auto it = m_docs.find(doc);
         if (it != m_docs.end() && it->server) {
             const auto &caps = it->server->capabilities();
-            if (caps.textDocumentSync == LSPDocumentSyncKind::Incremental) {
+            if (caps.textDocumentSync.change == LSPDocumentSyncKind::Incremental) {
                 return &(*it);
             }
         }