From 72624969e99d284984614a33cabb4ed9fea31a0a Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Fri, 30 Dec 2022 16:27:31 -0500
Subject: write rename request

---
 lsp-parse.c | 6 ++++++
 lsp-write.c | 9 +++++++++
 lsp.c       | 6 ++++++
 lsp.h       | 8 ++++++++
 main.c      | 6 ++++--
 5 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/lsp-parse.c b/lsp-parse.c
index a816ec9..7eb8460 100644
--- a/lsp-parse.c
+++ b/lsp-parse.c
@@ -158,6 +158,12 @@ static void parse_capabilities(LSP *lsp, const JSON *json, JSONObject capabiliti
 		cap->definition_support = true;
 	}
 	
+	// check for textDocument/rename support
+	JSONValue rename_value = json_object_get(json, capabilities, "renameProvider");
+	if (rename_value.type != JSON_UNDEFINED) {
+		cap->rename_support = true;
+	}
+	
 	// check for workspace/symbol support
 	JSONValue workspace_symbol_value = json_object_get(json, capabilities, "workspaceSymbolProvider");
 	if (workspace_symbol_value.type != JSON_UNDEFINED) {
diff --git a/lsp-write.c b/lsp-write.c
index e5e0d09..41f6d81 100644
--- a/lsp-write.c
+++ b/lsp-write.c
@@ -273,6 +273,8 @@ static const char *lsp_request_method(LSPRequest *request) {
 		return "textDocument/hover";
 	case LSP_REQUEST_DEFINITION:
 		return "textDocument/definition";
+	case LSP_REQUEST_RENAME:
+		return "textDocument/rename";
 	case LSP_REQUEST_WORKSPACE_FOLDERS:
 		return "workspace/workspaceFolders";
 	case LSP_REQUEST_DID_CHANGE_WORKSPACE_FOLDERS:
@@ -535,6 +537,13 @@ static void write_request(LSP *lsp, LSPRequest *request) {
 			write_document_position(o, def->position);
 		write_obj_end(o);
 	} break;
+	case LSP_REQUEST_RENAME: {
+		const LSPRequestRename *rename = &request->data.rename;
+		write_key_obj_start(o, "params");
+			write_document_position(o, rename->position);
+			write_key_string(o, "newName", rename->new_name);
+		write_obj_end(o);
+	} break;
 	case LSP_REQUEST_WORKSPACE_SYMBOLS: {
 		const LSPRequestWorkspaceSymbols *syms = &request->data.workspace_symbols;
 		write_key_obj_start(o, "params");
diff --git a/lsp.c b/lsp.c
index 875aab2..18b150e 100644
--- a/lsp.c
+++ b/lsp.c
@@ -75,6 +75,9 @@ static void lsp_request_free(LSPRequest *r) {
 		arr_free(w->added);
 		arr_free(w->removed);
 		} break;
+	case LSP_REQUEST_RENAME:
+		free(r->data.rename.new_name);
+		break;
 	case LSP_REQUEST_WORKSPACE_SYMBOLS:
 		free(r->data.workspace_symbols.query);
 		break;
@@ -168,6 +171,8 @@ static bool lsp_supports_request(LSP *lsp, const LSPRequest *request) {
 		return cap->definition_support;
 	case LSP_REQUEST_WORKSPACE_SYMBOLS:
 		return cap->workspace_symbols_support;
+	case LSP_REQUEST_RENAME:
+		return cap->rename_support;
 	}
 	assert(0);
 	return false;
@@ -199,6 +204,7 @@ static bool request_type_is_notification(LSPRequestType type) {
 	case LSP_REQUEST_SIGNATURE_HELP:
 	case LSP_REQUEST_HOVER:
 	case LSP_REQUEST_DEFINITION:
+	case LSP_REQUEST_RENAME:
 	case LSP_REQUEST_WORKSPACE_SYMBOLS:
 	case LSP_REQUEST_WORKSPACE_FOLDERS:
 		return false;
diff --git a/lsp.h b/lsp.h
index 5d5f3c4..57c81b5 100644
--- a/lsp.h
+++ b/lsp.h
@@ -52,6 +52,7 @@ typedef enum {
 	LSP_REQUEST_SIGNATURE_HELP, // textDocument/signatureHelp
 	LSP_REQUEST_HOVER, // textDocument/hover
 	LSP_REQUEST_DEFINITION, // textDocument/definition
+	LSP_REQUEST_RENAME, // textDocument/rename
 	LSP_REQUEST_WORKSPACE_SYMBOLS, // workspace/symbol
 	LSP_REQUEST_DID_CHANGE_WORKSPACE_FOLDERS, // workspace/didChangeWorkspaceFolders
 	
@@ -151,6 +152,11 @@ typedef struct {
 	char *query;
 } LSPRequestWorkspaceSymbols;
 
+typedef struct {
+	LSPDocumentPosition position;
+	char *new_name;
+} LSPRequestRename;
+
 typedef struct {
 	LSPDocumentID *removed; // dynamic array
 	LSPDocumentID *added; // dynamic array
@@ -174,6 +180,7 @@ typedef struct {
 		// LSP_REQUEST_SHOW_MESSAGE or LSP_REQUEST_LOG_MESSAGE
 		LSPRequestMessage message;
 		LSPRequestDidChangeWorkspaceFolders change_workspace_folders;
+		LSPRequestRename rename;
 	} data;
 } LSPRequest;
 
@@ -380,6 +387,7 @@ typedef struct {
 	// sadly, as of me writing this, clangd and rust-analyzer don't support this
 	// (but jdtls and gopls do)
 	bool workspace_folders_support;
+	bool rename_support;
 } LSPCapabilities;
 
 typedef struct LSP {
diff --git a/main.c b/main.c
index 211b47a..63a07a1 100644
--- a/main.c
+++ b/main.c
@@ -1,9 +1,11 @@
 /*
 @TODO:
-- handle multiple symbols with same name
 - more LSP stuff:
      - find usages
-     - refactoring?
+     - rename
+     - check for others
+- handle multiple symbols with same name in go-to-definition menu
+- :go-to-cursor-definition
 - test full unicode position handling
 - check if there are any other non-optional/nice-to-have-support-for server-to-client requests
 - better non-error window/showMessage(Request)
-- 
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