[clangd] Expose FileStatus to LSP.

Summary:
Add an LSP extension "textDocument/clangd.fileStatus" to emit file-status information.

Reviewers: ilya-biryukov

Subscribers: javed.absar, ioeric, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D55363

llvm-svn: 349768

1 files changed, 15 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/Protocol.h b/clang-tools-extra/clangd/Protocol.h
index 76dcf52a87e..94838a8575a 100644
--- a/clang-tools-extra/clangd/Protocol.h
+++ b/clang-tools-extra/clangd/Protocol.h
@@ -397,6 +397,9 @@ struct InitializationOptions {
   // the compilation database doesn't describe an opened file.
   // The command used will be approximately `clang $FILE $fallbackFlags`.
   std::vector<std::string> fallbackFlags;
+
+  /// Clients supports show file status for textDocument/clangd.fileStatus.
+  bool FileStatus = false;
 };
 bool fromJSON(const llvm::json::Value &, InitializationOptions &);
 
@@ -973,6 +976,18 @@ struct ReferenceParams : public TextDocumentPositionParams {
 };
 bool fromJSON(const llvm::json::Value &, ReferenceParams &);
 
+/// Clangd extension: indicates the current state of the file in clangd,
+/// sent from server via the `textDocument/clangd.fileStatus` notification.
+struct FileStatus {
+  /// The text document's URI.
+  URIForFile uri;
+  /// The human-readable string presents the current state of the file, can be
+  /// shown in the UI (e.g. status bar).
+  std::string state;
+  // FIXME: add detail messages.
+};
+llvm::json::Value toJSON(const FileStatus &FStatus);
+
 } // namespace clangd
 } // namespace clang