Do not fail to parse a multi-bar config

include/client.hpp

@@ -39,6 +39,7 @@ class Client {
   void                     handleOutput(struct waybar_output &output);
   bool                     isValidOutput(const Json::Value &config, struct waybar_output &output);
   auto                     setupConfig(const std::string &config_file, int depth) -> void;
+  auto                     resolveConfigIncludes(Json::Value &config, int depth) -> void;
   auto                     mergeConfig(Json::Value &a_config_, Json::Value &b_config_) -> void;
   auto                     setupCss(const std::string &css_file) -> void;
   struct waybar_output &   getOutput(void *);

man/waybar.5.scd.in

@@ -86,8 +86,9 @@ Also a minimal example configuration can be found on the at the bottom of this m
 	Only functional if compiled with gtk-layer-shell support.
 
 *include* ++
-	typeof: array ++
+	typeof: string|array ++
 	Paths to additional configuration files. In case of duplicate options, the including file's value takes precedence. Make sure to avoid circular imports.
+	For a multi-bar config, specify at least an empty object for each bar also in every file being included.
 
 # MODULE FORMAT
 

src/client.cpp

@@ -245,22 +245,50 @@ auto waybar::Client::setupConfig(const std::string &config_file, int depth) -> v
   std::string      str((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
   util::JsonParser parser;
   Json::Value      tmp_config_ = parser.parse(str);
-  if (tmp_config_["include"].isArray()) {
+  if (tmp_config_.isArray()) {
-    for (const auto &include : tmp_config_["include"]) {
+    for (auto &config_part : tmp_config_) {
-      spdlog::info("Including resource file: {}", include.asString());
+      resolveConfigIncludes(config_part, depth);
-      setupConfig(getValidPath({include.asString()}), ++depth);
     }
+  } else {
+    resolveConfigIncludes(tmp_config_, depth);
   }
   mergeConfig(config_, tmp_config_);
 }
 
-auto waybar::Client::mergeConfig(Json::Value &a_config_, Json::Value &b_config_) -> void {
+auto waybar::Client::resolveConfigIncludes(Json::Value &config, int depth) -> void {
-  for (const auto &key : b_config_.getMemberNames()) {
+  Json::Value includes = config["include"];
-    if (a_config_[key].type() == Json::objectValue && b_config_[key].type() == Json::objectValue) {
+  if (includes.isArray()) {
-      mergeConfig(a_config_[key], b_config_[key]);
+    for (const auto &include : includes) {
-    } else {
+      spdlog::info("Including resource file: {}", include.asString());
-      a_config_[key] = b_config_[key];
+      setupConfig(getValidPath({include.asString()}), ++depth);
     }
+  } else if (includes.isString()) {
+    spdlog::info("Including resource file: {}", includes.asString());
+    setupConfig(getValidPath({includes.asString()}), ++depth);
+  }
+}
+
+auto waybar::Client::mergeConfig(Json::Value &a_config_, Json::Value &b_config_) -> void {
+  if (!a_config_) {
+    // For the first config
+    a_config_ = b_config_;
+  } else if (a_config_.isObject() && b_config_.isObject()) {
+    for (const auto &key : b_config_.getMemberNames()) {
+      if (a_config_[key].isObject() && b_config_[key].isObject()) {
+        mergeConfig(a_config_[key], b_config_[key]);
+      } else {
+        a_config_[key] = b_config_[key];
+      }
+    }
+  } else if (a_config_.isArray() && b_config_.isArray()) {
+    // This can happen only on the top-level array of a multi-bar config
+    for (Json::Value::ArrayIndex i = 0; i < b_config_.size(); i++) {
+      if (a_config_[i].isObject() && b_config_[i].isObject()) {
+        mergeConfig(a_config_[i], b_config_[i]);
+      }
+    }
+  } else {
+    spdlog::error("Cannot merge config, conflicting or invalid JSON types");
   }
 }