Init: ktlint 적용 및 기존 코드, ci에 ktlint 반영

Author: l5x5l

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+max_line_length = 160
+
+[*.{kt,kts}]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+trim_trailing_whitespace = true
+insert_final_newline = true
+tab_width = 4
+ij_kotlin_allow_trailing_comma = true
+ktlint_function_naming_ignore_when_annotated_with=Composable

.github/workflows/develop_branch.yml

@@ -21,6 +21,9 @@ jobs:
           distribution: 'temurin'
           cache: gradle
 
+      - name: Run ktlint
+        run: ./gradlew ktlintCheck
+
       - name: Run unit tests
         run: ./gradlew testDebugUnitTest
 

app/build.gradle.kts

@@ -23,7 +23,7 @@ android {
             isMinifyEnabled = false
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
-                "proguard-rules.pro"
+                "proguard-rules.pro",
             )
         }
     }

app/src/androidTest/java/com/threegap/bitnagil/ExampleInstrumentedTest.kt

@@ -1,13 +1,11 @@
 package com.threegap.bitnagil
 
-import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.ext.junit.runners.AndroidJUnit4
-
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Assert.assertEquals
 import org.junit.Test
 import org.junit.runner.RunWith
 
-import org.junit.Assert.*
-
 /**
  * Instrumented test, which will execute on an Android device.
  *

app/src/main/java/com/threegap/bitnagil/MainActivity.kt

@@ -22,7 +22,7 @@ class MainActivity : ComponentActivity() {
                 Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                     Greeting(
                         name = "Android",
-                        modifier = Modifier.padding(innerPadding)
+                        modifier = Modifier.padding(innerPadding),
                     )
                 }
             }
@@ -31,10 +31,13 @@ class MainActivity : ComponentActivity() {
 }
 
 @Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
+fun Greeting(
+    name: String,
+    modifier: Modifier = Modifier,
+) {
     Text(
         text = "Hello $name!",
-        modifier = modifier
+        modifier = modifier,
     )
 }
 

app/src/main/java/com/threegap/bitnagil/ui/theme/Theme.kt

@@ -10,38 +10,41 @@ import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.platform.LocalContext
 
-private val DarkColorScheme = darkColorScheme(
-    primary = Purple80,
-    secondary = PurpleGrey80,
-    tertiary = Pink80
-)
+private val DarkColorScheme =
+    darkColorScheme(
+        primary = Purple80,
+        secondary = PurpleGrey80,
+        tertiary = Pink80,
+    )
 
-private val LightColorScheme = lightColorScheme(
-    primary = Purple40,
-    secondary = PurpleGrey40,
-    tertiary = Pink40
-)
+private val LightColorScheme =
+    lightColorScheme(
+        primary = Purple40,
+        secondary = PurpleGrey40,
+        tertiary = Pink40,
+    )
 
 @Composable
 fun BitnagilTheme(
     darkTheme: Boolean = isSystemInDarkTheme(),
     // Dynamic color is available on Android 12+
     dynamicColor: Boolean = true,
-    content: @Composable () -> Unit
+    content: @Composable () -> Unit,
 ) {
-    val colorScheme = when {
-        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
-            val context = LocalContext.current
-            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
-        }
+    val colorScheme =
+        when {
+            dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+                val context = LocalContext.current
+                if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+            }
 
-        darkTheme -> DarkColorScheme
-        else -> LightColorScheme
-    }
+            darkTheme -> DarkColorScheme
+            else -> LightColorScheme
+        }
 
     MaterialTheme(
         colorScheme = colorScheme,
         typography = Typography,
-        content = content
+        content = content,
     )
 }

app/src/main/java/com/threegap/bitnagil/ui/theme/Type.kt

@@ -7,12 +7,14 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.sp
 
 // Set of Material typography styles to start with
-val Typography = Typography(
-    bodyLarge = TextStyle(
-        fontFamily = FontFamily.Default,
-        fontWeight = FontWeight.Normal,
-        fontSize = 16.sp,
-        lineHeight = 24.sp,
-        letterSpacing = 0.5.sp
+val Typography =
+    Typography(
+        bodyLarge =
+            TextStyle(
+                fontFamily = FontFamily.Default,
+                fontWeight = FontWeight.Normal,
+                fontSize = 16.sp,
+                lineHeight = 24.sp,
+                letterSpacing = 0.5.sp,
+            ),
     )
-)

app/src/test/java/com/threegap/bitnagil/ExampleUnitTest.kt

@@ -1,9 +1,8 @@
 package com.threegap.bitnagil
 
+import org.junit.Assert.assertEquals
 import org.junit.Test
 
-import org.junit.Assert.*
-
 /**
  * Example local unit test, which will execute on the development machine (host).
  *

build.gradle.kts

@@ -3,4 +3,9 @@ plugins {
     alias(libs.plugins.android.application) apply false
     alias(libs.plugins.kotlin.android) apply false
     alias(libs.plugins.kotlin.compose) apply false
+    alias(libs.plugins.ktlint.gradle) apply false
 }
+
+subprojects {
+    apply(plugin = "org.jlleitschuh.gradle.ktlint")
+}

gradle/libs.versions.toml

@@ -8,6 +8,7 @@ espressoCore = "3.6.1"
 lifecycleRuntimeKtx = "2.9.1"
 activityCompose = "1.10.1"
 composeBom = "2025.06.00"
+ktlint = "12.3.0"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -29,4 +30,5 @@ androidx-material3 = { group = "androidx.compose.material3", name = "material3"
 android-application = { id = "com.android.application", version.ref = "androidGradlePlugin" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
+ktlint-gradle = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }