Add structures to support document formatting

src/ipc.cc

@@ -34,6 +34,8 @@ const char* IpcIdToString(IpcId id) {
       return "textDocument/documentHighlight";
     case IpcId::TextDocumentHover:
       return "textDocument/hover";
+    case IpcId::TextDocumentFormatting:
+      return "textDocument/formatting";
     case IpcId::TextDocumentReferences:
       return "textDocument/references";
     case IpcId::TextDocumentDocumentSymbol:

src/ipc.h

@@ -22,6 +22,7 @@ enum class IpcId : int {
   TextDocumentDefinition,
   TextDocumentDocumentHighlight,
   TextDocumentHover,
+  TextDocumentFormatting,
   TextDocumentReferences,
   TextDocumentDocumentSymbol,
   TextDocumentDocumentLink,

src/language_server_api.h

@@ -273,6 +273,25 @@ struct lsTextDocumentPositionParams {
 };
 MAKE_REFLECT_STRUCT(lsTextDocumentPositionParams, textDocument, position);
 
+struct lsFormattingOptions {
+  // Size of a tab in spaces.
+  int tabSize;
+  // Prefer spaces over tabs.
+  bool insertSpaces;
+};
+MAKE_REFLECT_STRUCT(lsFormattingOptions, tabSize, insertSpaces);
+
+struct lsTextDocumentFormattingParams {
+  // The text document.
+  lsTextDocumentIdentifier textDocument;
+
+  // The format options, like tabs or spaces.
+  lsFormattingOptions formattingOptions;
+};
+MAKE_REFLECT_STRUCT(lsTextDocumentFormattingParams,
+                    textDocument,
+                    formattingOptions);
+
 struct lsTextEdit {
   // The range of the text document to be manipulated. To insert
   // text into a document create a range where start === end.

src/messages/text_document_formatting.cc

@@ -0,0 +1,20 @@
+#include "message_handler.h"
+
+namespace {
+struct Ipc_TextDocumentFormatting
+    : public IpcMessage<Ipc_TextDocumentFormatting> {
+  const static IpcId kIpcId = IpcId::TextDocumentFormatting;
+
+  lsRequestId id;
+  lsTextDocumentFormattingParams params;
+};
+MAKE_REFLECT_STRUCT(Ipc_TextDocumentFormatting, id, params);
+REGISTER_IPC_MESSAGE(Ipc_TextDocumentFormatting);
+
+struct Out_TextDocumentFormatting
+    : public lsOutMessage<Out_TextDocumentFormatting> {
+  lsRequestId id;
+  std::vector<lsTextEdit> edits;
+};
+MAKE_REFLECT_STRUCT(Out_TextDocumentFormatting, jsonrpc, id, edits);
+}  // namespace