app: some comments and erorrs regarding IDs configuration

[staging/windowmanager.git] / src / app.cpp

diff --git a/src/app.cpp b/src/app.cpp
index 8c929fe..1c9b3c2 100644 (file)
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -59,12 +59,24 @@ result<struct layout> layout_from_json(json const &j) {
    return Ok(l);
 }
 
+result<json> file_to_json(char const *filename) {
+   std::ifstream i(filename);
+   if (i.fail()) {
+      return Err<json>("Could not open config file");
+   }
+   json j;
+   i >> j;
+   return Ok(j);
+}
+
 struct result<layouts_type> load_layout(char const *filename) {
    DB("loading layout from " << filename);
 
-   json jlayouts;
-   std::ifstream i(filename);
-   i >> jlayouts;
+   auto j = file_to_json(filename);
+   if (j.is_err()) {
+      return Err<layouts_type>(j.unwrap_err());
+   }
+   json jlayouts = j.unwrap();
 
    auto layouts = layouts_type();
    layouts.reserve(jlayouts.size());
@@ -78,9 +90,11 @@ struct result<surface_id_to_layer_map>
    load_layer_ids(char const *filename) {
    DB("loading IDs from " << filename);
 
-   json jids;
-   std::ifstream i(filename);
-   i >> jids;
+   auto j = file_to_json(filename);
+   if (j.is_err()) {
+      return Err<surface_id_to_layer_map>(j.unwrap_err());
+   }
+   json jids = j.unwrap();
 
    return to_surface_id_to_layer_map(jids);
 }
@@ -99,19 +113,27 @@ App::App(wl::display *d)
      display{d},
      controller{},
      outputs(),
-     layouts(),  // load_layout("../layout.json").unwrap()),
-     surface2layer(load_layer_ids("../ids.json").unwrap()) {
-   // layouts(load_layout("../layout.json").unwrap()) {
+     layouts(),
+     surface2layer() {
    assert(g_app == nullptr);
    g_app = this;
 
-   try {
+   {
+      auto l = load_layer_ids("../ids.json");
+      if (l.is_ok()) {
+         this->surface2layer = l.unwrap();
+      } else {
+         logerror("%s", l.err().value());
+      }
+   }
+
+   {
       auto l = load_layout("../layout.json");
-      if (l.is_err()) {
-         logerror("Coult not load layout configuration: %s", l.err().value());
+      if (l.is_ok()) {
+         this->layouts = l.unwrap();
+      } else {
+         logerror("%s", l.err().value());
       }
-   } catch (std::exception &e) {
-      logerror("Coult not load layout configuration: %s", e.what());
    }
 }
 
@@ -122,6 +144,11 @@ int App::init() {
       return -1;
    }
 
+   if (this->surface2layer.mapping.empty()) {
+      logerror("No surface -> layer mapping loaded");
+      return -1;
+   }
+
    this->display->add_global_handler(
       "wl_output", [this](wl_registry *r, uint32_t name, uint32_t v) {
          this->outputs.emplace_back(std::make_unique<wl::output>(r, name, v));
@@ -247,6 +274,8 @@ void App::surface_created(uint32_t surface_id) {
             int w = rect.w;
             int h = rect.h;
 
+            // less-than-0 values refer to MAX + 1 - $VALUE
+            // e.g. MAX is either screen width or height
             if (w < 0) {
                w = c->output_size.w + 1 + w;
             }
@@ -255,8 +284,11 @@ void App::surface_created(uint32_t surface_id) {
             }
             logdebug("Computed rect={ %d, %d, %d, %d }", x, y, w, h);
 
+            // configure surface to wxh dimensions
             s->set_configuration(w, h);
+            // set source rect to "entire surface"
             s->set_source_rectangle(0, 0, w, h);
+            // set destination to the display rectangle
             s->set_destination_rectangle(x, y, w, h);
 
             s->set_visibility(1);