From 622efdcd6a948a22cd98de10d21c7daf95a768a5 Mon Sep 17 00:00:00 2001
From: Martin Tournoij <martin@arp242.net>
Date: Thu, 13 Apr 2023 07:33:43 +0200
Subject: [PATCH] Use plain text if the client tells zls it's preferred

LSP clients send a list of supported formats for definition and
completion; the specification says "the order describes the preferred
format of the client."[1]

My client sends:

	'hover': {'contentFormat': ['plaintext', 'markdown']},

So it should prefer plaintext, using markdown if that's not supported by
the server. zls behaved slightly different: it would use Markdown if it
appears at all in the list of supported formats.

This fixes it so that it will use plain text if that appears before
'markdown' in the list.

[1]: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_hover
---
 src/Server.zig | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Server.zig b/src/Server.zig
index 22aa2d2..69d4caa 100644
--- a/src/Server.zig
+++ b/src/Server.zig
@@ -399,6 +399,9 @@ fn initializeHandler(server: *Server, request: types.InitializeParams) Error!typ
         if (textDocument.hover) |hover| {
             if (hover.contentFormat) |content_format| {
                 for (content_format) |format| {
+                    if (format == .plaintext) {
+                        break;
+                    }
                     if (format == .markdown) {
                         server.client_capabilities.hover_supports_md = true;
                         break;
@@ -412,6 +415,9 @@ fn initializeHandler(server: *Server, request: types.InitializeParams) Error!typ
                 server.client_capabilities.supports_snippets = completionItem.snippetSupport orelse false;
                 if (completionItem.documentationFormat) |documentation_format| {
                     for (documentation_format) |format| {
+                        if (format == .plaintext) {
+                            break;
+                        }
                         if (format == .markdown) {
                             server.client_capabilities.completion_doc_supports_md = true;
                             break;