[debug] Show toast when network error occurred

app/src/main/java/com/keylesspalace/tusky/di/NetworkModule.kt

@@ -25,6 +25,7 @@ import com.google.gson.GsonBuilder
 import com.keylesspalace.tusky.BuildConfig
 import com.keylesspalace.tusky.db.AccountManager
 import com.keylesspalace.tusky.json.Rfc3339DateJsonAdapter
+import com.keylesspalace.tusky.network.HttpToastInterceptor
 import com.keylesspalace.tusky.network.InstanceSwitchAuthInterceptor
 import com.keylesspalace.tusky.network.MastodonApi
 import com.keylesspalace.tusky.network.MediaUploadApi
@@ -105,6 +106,7 @@ class NetworkModule {
                 addInterceptor(InstanceSwitchAuthInterceptor(accountManager))
                 if (BuildConfig.DEBUG) {
                     addInterceptor(HttpLoggingInterceptor().apply { level = HttpLoggingInterceptor.Level.BASIC })
+                    addInterceptor(HttpToastInterceptor(context))
                 }
             }
             .build()

app/src/main/java/com/keylesspalace/tusky/network/HttpToastInterceptor.kt

@@ -0,0 +1,31 @@
+package com.keylesspalace.tusky.network
+
+import android.content.Context
+import android.widget.Toast
+import androidx.core.content.ContextCompat
+import okhttp3.Interceptor
+import okhttp3.Response
+
+class HttpToastInterceptor(
+    private val context: Context,
+) : Interceptor {
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        val request = chain.request()
+
+        return runCatching { chain.proceed(request) }
+            .onSuccess {
+                if (!it.isSuccessful) {
+                    showToast("${request.method} ${request.url}\n${it.code} ${it.message}")
+                }
+            }
+            .onFailure { showToast("${request.method} ${request.url}\n${it}") }
+            .getOrThrow()
+    }
+
+    private fun showToast(message: String) {
+        ContextCompat.getMainExecutor(context).execute {
+            Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
+        }
+    }
+}