CHANGE logging from Napier to Kermit

README.MD

@@ -328,7 +328,7 @@ because it is fast, modern and has IDE integration (which warns you when you for
 @Serializable annotations).
 It also has multiplatform support, so we can use it in our KMP projects as well.
 
-We use Napier because it's usage is close to Timber/Tolbaaken, but Napier supports KMM.
+We use Kermit because it's usage is close to Timber/Tolbaaken, but Kermit supports KMM.
 
 We use Crashlytics for crash reporting. Note that Google Analytics is not added. Google [recommends]
 (https://firebase.google.com/docs/crashlytics/get-started?platform=android#before-you-begin)

app/proguard-rules.pro

@@ -27,9 +27,3 @@
 }
 
 ## END enums
-
-## START napier
--keep class io.github.aakira.napier.** {
-    *;
-}
-## END napier

app/src/main/kotlin/nl/q42/template/MainActivity.kt

@@ -17,7 +17,7 @@ import androidx.compose.ui.Modifier
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.rememberNavController
-import io.github.aakira.napier.Napier
+import co.touchlab.kermit.Logger
 import nl.q42.template.core.utils.config.AppScheme
 import nl.q42.template.navigation.Destination
 import nl.q42.template.navigation.homeGraph
@@ -40,7 +40,7 @@ class MainActivity : ComponentActivity() {
         enableEdgeToEdge() // must be called before super.onCreate
         super.onCreate(savedInstanceState)
 
-        Napier.d { "onCreate received, ${intent.data}" }
+        Logger.d { "onCreate received, ${intent.data}" }
 
         setContent {
 
@@ -77,7 +77,7 @@ class MainActivity : ComponentActivity() {
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
 
-        Napier.d { "onNewIntent received, ${intent.data}" }
+        Logger.d { "onNewIntent received, ${intent.data}" }
 
     }
 

app/src/main/kotlin/nl/q42/template/MainApplication.kt

@@ -2,20 +2,25 @@ package nl.q42.template
 
 import android.app.Application
 import android.os.StrictMode
+import co.touchlab.kermit.LogcatWriter
+import co.touchlab.kermit.Logger
+import co.touchlab.kermit.Severity
 import com.google.firebase.crashlytics.FirebaseCrashlytics
-import io.github.aakira.napier.DebugAntilog
-import io.github.aakira.napier.Napier
 import nl.q42.template.di.initDependencyInjection
-import nl.q42.template.logging.CrashlyticsLogger
+import nl.q42.template.logging.CrashlyticsLogWriter
 
 class MainApplication : Application() {
 
     override fun onCreate() {
         super.onCreate()
 
+        Logger.setTag("Template")
+
         if (BuildConfig.DEBUG) {
             FirebaseCrashlytics.getInstance().isCrashlyticsCollectionEnabled = false
-            Napier.base(DebugAntilog())
+
+            Logger.setMinSeverity(Severity.Verbose)
+            Logger.setLogWriters(LogcatWriter())
 
             StrictMode.setThreadPolicy(
                 StrictMode.ThreadPolicy.Builder()
@@ -27,7 +32,12 @@ class MainApplication : Application() {
             )
         } else {
             FirebaseCrashlytics.getInstance().isCrashlyticsCollectionEnabled = true
-            Napier.base(CrashlyticsLogger())
+
+            Logger.setMinSeverity(Severity.Info)
+            Logger.setLogWriters(
+                LogcatWriter(),
+                CrashlyticsLogWriter()
+            )
         }
 
         initDependencyInjection(this)

app/src/main/kotlin/nl/q42/template/logging/CrashlyticsLogWriter.kt

@@ -0,0 +1,44 @@
+package nl.q42.template.logging
+
+import co.touchlab.kermit.LogWriter
+import co.touchlab.kermit.Severity
+import com.google.firebase.Firebase
+import com.google.firebase.crashlytics.crashlytics
+
+/** A value suitable for Crashlytics
+ * This value is used to truncate the user-defined message and the exception message
+ * In theory, the message sent to Crashlytics could therefore be 2x this value
+ */
+private const val MAX_CHARS_IN_LOG = 1200
+
+/**
+ * A Crashlytics logger. Logs Severity.Error as Non-Fatal and less severe messages will be added
+ * to the next crashlytics event (crash, non-fatal or ANR) as breadcrumbs
+ */
+class CrashlyticsLogWriter : LogWriter() {
+    override fun log(
+        severity: Severity,
+        message: String,
+        tag: String,
+        throwable: Throwable?
+    ) {
+
+        val limitedMessage =
+            message.take(MAX_CHARS_IN_LOG) // to avoid OutOfMemoryError's
+
+        if (severity < Severity.Error) {
+            val errorMessage = throwable?.let {
+                " with error: ${throwable}: ${throwable.message}".take(MAX_CHARS_IN_LOG)
+            } ?: ""
+            Firebase.crashlytics.log(limitedMessage + errorMessage)
+        } else {
+            Firebase.crashlytics.log("recordException with message: $limitedMessage")
+            Firebase.crashlytics.recordException(
+                throwable ?: Exception(
+                    limitedMessage,
+                )
+            )
+        }
+    }
+
+}

build.module.feature-and-app.gradle

@@ -31,7 +31,7 @@ android {
 
 dependencies {
     implementation project(':core:utils')
-    implementation(libs.napier)
+    implementation(libs.kermit)
     implementation(libs.activityCompose)
     implementation(libs.koin)
 

build.module.library.gradle

@@ -13,5 +13,5 @@ android {
 }
 
 dependencies {
-    implementation(libs.napier)
-}
+    implementation(libs.kermit)
+}

core/actionresult/src/main/kotlin/nl/q42/template/actionresult/data/ActionResultMapper.kt

@@ -1,7 +1,7 @@
 package nl.q42.template.actionresult.data
 
+import co.touchlab.kermit.Logger
 import com.haroldadmin.cnradapter.NetworkResponse
-import io.github.aakira.napier.Napier
 import kotlinx.coroutines.CancellationException
 import kotlinx.serialization.SerializationException
 import nl.q42.template.actionresult.domain.ActionResult
@@ -66,7 +66,7 @@ private fun <T : Any> NetworkResponse<T, ApiErrorResponse>.networkResponseToActi
             val errorMessage = "Received NetworkResponse.UnknownError with response code $statusCode and header ${this.headers}"
             val error = this.error
             val exception = IOException(errorMessage, error)
-            Napier.w(error) { "NetworkResponse.UnknownError" }
+            Logger.w(error) { "NetworkResponse.UnknownError" }
             when {
                 error is SerializationException -> { // (usually json) parsing error
                     ActionResult.Error.InvalidErrorResponse(error)

core/network/src/main/kotlin/nl/q42/template/core/network/logger/JsonFormattedHttpLogger.kt

@@ -1,6 +1,6 @@
 package nl.q42.template.core.network.logger
 
-import io.github.aakira.napier.Napier
+import co.touchlab.kermit.Logger
 import okhttp3.logging.HttpLoggingInterceptor
 import org.json.JSONException
 import org.json.JSONObject
@@ -11,10 +11,10 @@ import org.json.JSONObject
 class JsonFormattedHttpLogger : HttpLoggingInterceptor.Logger {
     override fun log(message: String) {
         if (message.startsWith("{") || message.startsWith("[")) try {
-            Napier.d { JSONObject(message).toString(4) }
+            Logger.d { JSONObject(message).toString(4) }
         } catch (e: JSONException) {
-            Napier.d { message }
+            Logger.d { message }
         }
-        else Napier.d { message }
+        else Logger.d { message }
     }
-}
+}

core/ui/src/main/kotlin/nl/q42/template/ui/compose/composables/window/ColumnScreenContent.kt

@@ -67,4 +67,4 @@ private fun ColumnScreenContentPreview() {
             }
         },
     )
-}
+}

data/main/src/main/kotlin/nl/q42/template/data/main/remote/UserRemoteDataSource.kt

@@ -1,6 +1,6 @@
 package nl.q42.template.data.main.remote
 
-import io.github.aakira.napier.Napier
+import co.touchlab.kermit.Logger
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import nl.q42.template.actionresult.data.mapToActionResult
@@ -25,7 +25,7 @@ internal class UserRemoteDataSource(
             }
 
             is ActionResult.Error -> {
-                Napier.e(apiActionResult.throwable) { "getUser failed" }
+                Logger.e(apiActionResult.throwable) { "getUser failed" }
                 apiActionResult
             }
         }

feature/home/src/main/kotlin/nl/q42/template/home/main/presentation/HomeViewModel.kt

@@ -2,7 +2,7 @@ package nl.q42.template.home.main.presentation
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import io.github.aakira.napier.Napier
+import co.touchlab.kermit.Logger
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -48,11 +48,12 @@ class HomeViewModel(
     }
 
     fun onLoadClicked() {
+        Logger.i { "onLoadClicked" }
         fetchUser()
     }
 
     fun onOpenSecondScreenClicked() {
-        Napier.e { "Open Second Screen tapped. This will be shown In LogCat and on prod builds also as as the title of a Non-Fatal event" }
+        Logger.e { "Open Second Screen tapped. This will be shown In LogCat and on prod builds also as as the title of a Non-Fatal event" }
         navigateTo(Destination.HomeSecond(title = "Hello world!"))
     }
 

gradle/libs.versions.toml

@@ -1,5 +1,6 @@
 [versions]
 jvmTarget = "21"
+kermit = "2.0.8"
 kotlin = "2.2.20"
 # should match kotlin https://github.com/google/ksp/releases
 gradlePlugin = "8.11.2"
@@ -10,7 +11,6 @@ retrofit = "3.0.0"
 kotlinx-serialization = "1.9.0"
 retrofit2KotlinxSerializationConverter = "1.0.0"
 networkResponseAdapter = "5.0.0"
-napier = "2.7.1"
 composeNavigation = "2.9.5"
 okhttp = "5.2.1"
 composePlatform = "2025.10.00"
@@ -27,6 +27,7 @@ licensee = "1.14.1"
 
 [libraries]
 junit = { module = "junit:junit", version.ref = "junit" }
+kermit = { module = "co.touchlab:kermit", version.ref = "kermit" }
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test" }
 kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "kotlinxCoroutinesTest" }
 mockk-agent = { module = "io.mockk:mockk-agent", version.ref = "mockkAndroid" }
@@ -37,7 +38,6 @@ kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serializa
 networkResponseAdapter = { module = "com.github.haroldadmin:NetworkResponseAdapter", version.ref = "networkResponseAdapter" }
 okhttp = { module = "com.squareup.okhttp3:okhttp", version.ref = "okhttp" }
 okhttpLogging = { module = "com.squareup.okhttp3:logging-interceptor", version.ref = "okhttp" }
-napier = { module = "io.github.aakira:napier", version.ref = "napier" }
 composeUIGraphics = { module = "androidx.compose.ui:ui-graphics" }
 composeUITooling = { module = "androidx.compose.ui:ui-tooling" }
 composeUIToolingPreview = { module = "androidx.compose.ui:ui-tooling-preview" }