remove requests.Configuration (#696)

src/Config.zig

@@ -255,3 +255,25 @@ pub fn getZigEnv(allocator: std.mem.Allocator, zig_exe_path: []const u8) ?Env {
         return null;
     };
 }
+
+pub const Configuration = Config.getConfigurationType();
+pub const DidChangeConfigurationParams = struct {
+    settings: ?Configuration,
+};
+
+// returns a Struct which is the same as `Config` except that every field is optional.
+fn getConfigurationType() type {
+    var config_info: std.builtin.Type = @typeInfo(Config);
+    var fields: [config_info.Struct.fields.len]std.builtin.Type.StructField = undefined;
+    for (config_info.Struct.fields) |field, i| {
+        fields[i] = field;
+        if (@typeInfo(field.field_type) != .Optional) {
+            fields[i].field_type = @Type(std.builtin.Type{
+                .Optional = .{ .child = field.field_type },
+            });
+        }
+    }
+    config_info.Struct.fields = fields[0..];
+    config_info.Struct.decls = &.{};
+    return @Type(config_info);
+}

src/Server.zig

@@ -2062,24 +2062,26 @@ fn formattingHandler(server: *Server, writer: anytype, id: types.RequestId, req:
     return try respondGeneric(writer, id, null_result_response);
 }
 
-fn didChangeConfigurationHandler(server: *Server, writer: anytype, id: types.RequestId, maybe_req: std.json.Value) !void {
+fn didChangeConfigurationHandler(server: *Server, writer: anytype, id: types.RequestId, req: Config.DidChangeConfigurationParams) !void {
     const tracy_zone = tracy.trace(@src());
     defer tracy_zone.end();
 
     _ = id;
-    if (maybe_req.Object.get("params").?.Object.get("settings").? == .Object) {
-        const req = try requests.fromDynamicTree(&server.arena, requests.Configuration, maybe_req);
-        inline for (std.meta.fields(Config)) |field| {
-            if (@field(req.params.settings, field.name)) |value| {
-                log.debug("setting configuration option '{s}' to '{any}'", .{ field.name, value });
+
+    // NOTE: VS Code seems to always respond with null
+    if (req.settings) |configuration| {
+        inline for (std.meta.fields(Config.Configuration)) |field| {
+            if (@field(configuration, field.name)) |value| {
                 @field(server.config, field.name) = if (@TypeOf(value) == []const u8) try server.allocator.dupe(u8, value) else value;
+                log.debug("setting configuration option '{s}' to '{any}'", .{ field.name, value });
             }
         }
 
         try server.config.configChanged(server.allocator, null);
-    } else if (server.client_capabilities.supports_configuration)
+    } else if (server.client_capabilities.supports_configuration) {
         try server.requestConfiguration(writer);
     }
+}
 
 fn renameHandler(server: *Server, writer: anytype, id: types.RequestId, req: requests.Rename) !void {
     const tracy_zone = tracy.trace(@src());
@@ -2435,7 +2437,7 @@ pub fn processJsonRpc(server: *Server, writer: anytype, json: []const u8) !void
         .{ "textDocument/references", requests.References, referencesHandler },
         .{ "textDocument/documentHighlight", requests.DocumentHighlight, documentHighlightHandler },
         .{ "textDocument/codeAction", requests.CodeAction, codeActionHandler },
-        .{ "workspace/didChangeConfiguration", std.json.Value, didChangeConfigurationHandler },
+        .{ "workspace/didChangeConfiguration", Config.DidChangeConfigurationParams, didChangeConfigurationHandler },
     };
 
     if (zig_builtin.zig_backend == .stage1) {

src/requests.zig

@@ -288,30 +288,3 @@ pub const CodeAction = struct {
         },
     },
 };
-
-pub const Configuration = struct {
-    params: struct {
-        settings: struct {
-            enable_snippets: ?bool,
-            enable_ast_check_diagnostics: ?bool,
-            enable_autofix: ?bool,
-            enable_import_embedfile_argument_completions: ?bool,
-            zig_lib_path: ?[]const u8,
-            zig_exe_path: ?[]const u8,
-            warn_style: ?bool,
-            build_runner_path: ?[]const u8,
-            global_cache_path: ?[]const u8,
-            enable_semantic_tokens: ?bool,
-            enable_inlay_hints: ?bool,
-            inlay_hints_show_builtin: ?bool,
-            inlay_hints_exclude_single_argument: ?bool,
-            inlay_hints_hide_redundant_param_names: ?bool,
-            inlay_hints_hide_redundant_param_names_last_token: ?bool,
-            operator_completions: ?bool,
-            include_at_in_builtins: ?bool,
-            max_detail_length: ?usize,
-            skip_std_references: ?bool,
-            builtin_path: ?[]const u8,
-        },
-    },
-};