Add the fail-safe process for the configuration file

If the configuration file "layers.json" can not be opened,
windowmanager uses a default layer configuration.

Change-Id: I1b20f385c5e748a90be5e930a1775a6b3a4f39a5
Signed-off-by: Yuta Doi <yuta-d@witz-inc.co.jp>

1 files changed, 7 insertions, 3 deletions

diff --git a/src/app.cpp b/src/app.cpp
index ba258b5..af552b5 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -44,12 +44,16 @@ namespace {
 using nlohmann::json;
 
 result<json> file_to_json(char const *filename) {
+   json j;
    std::ifstream i(filename);
    if (i.fail()) {
-      return Err<json>("Could not open config file");
+      HMI_DEBUG("wm", "Could not open config file, so use default layer information");
+      j = default_layers_json;
    }
-   json j;
-   i >> j;
+   else {
+      i >> j;
+   }
+
    return Ok(j);
 }