Address code review feedback: use Properties API, remove extra whitespace, add CHANGELOG entry

Co-authored-by: JLLeitschuh <1323708+JLLeitschuh@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+### Added
+
+- Add support for reading ktlint version from `ktlint-plugins.properties` file [#TBD](https://github.com/JLLeitschuh/ktlint-gradle/pull/TBD)
+  - Enables automatic synchronization of ktlint version between IntelliJ plugin and Gradle builds
+  - When `ktlint-plugins.properties` exists in project root with `ktlint-version` property, that version is used as default
+  - Explicit version configuration in build script still takes precedence
+
 ## [14.0.1] - 2025-11-10
 
 - Update build to work with gradle 9.1 and Java 25 [#962](https://github.com/JLLeitschuh/ktlint-gradle/pull/962)

plugin/src/main/kotlin/org/jlleitschuh/gradle/ktlint/PluginUtil.kt

@@ -49,17 +49,10 @@ internal fun readKtlintVersionFromPropertiesFile(projectDir: Path): String? {
         return null
     }
 
-    return propertiesFile.toFile().useLines { lines ->
-        lines
-            .filter { it.contains("=") }
-            .map {
-                val key = it.substringBefore("=").trim()
-                val value = it.substringAfter('=').trim()
-                key to value
-            }
-            .firstOrNull { it.first == KTLINT_PLUGINS_VERSION_PROPERTY }
-            ?.second
-            ?.takeIf { it.isNotBlank() }
+    return propertiesFile.toFile().inputStream().use { input ->
+        val properties = java.util.Properties()
+        properties.load(input)
+        properties.getProperty(KTLINT_PLUGINS_VERSION_PROPERTY)?.takeIf { it.isNotBlank() }
     }
 }
 

plugin/src/test/kotlin/org/jlleitschuh/gradle/ktlint/KtlintPluginsPropertiesTest.kt

@@ -24,7 +24,6 @@ class KtlintPluginsPropertiesTest : AbstractPluginTest() {
 
             buildGradle.appendText(
                 """
-                
                 tasks.register("printKtlintVersion") {
                     doLast {
                         println("Ktlint version: " + ktlint.version.get())
@@ -46,7 +45,6 @@ class KtlintPluginsPropertiesTest : AbstractPluginTest() {
 
             buildGradle.appendText(
                 """
-                
                 tasks.register("printKtlintVersion") {
                     doLast {
                         println("Ktlint version: " + ktlint.version.get())
@@ -75,7 +73,6 @@ class KtlintPluginsPropertiesTest : AbstractPluginTest() {
 
             buildGradle.appendText(
                 """
-                
                 ktlint {
                     version = "1.3.0"
                 }
@@ -108,7 +105,6 @@ class KtlintPluginsPropertiesTest : AbstractPluginTest() {
 
             buildGradle.appendText(
                 """
-                
                 tasks.register("printKtlintVersion") {
                     doLast {
                         println("Ktlint version: " + ktlint.version.get())
@@ -137,7 +133,6 @@ class KtlintPluginsPropertiesTest : AbstractPluginTest() {
 
             buildGradle.appendText(
                 """
-                
                 tasks.register("printKtlintVersion") {
                     doLast {
                         println("Ktlint version: " + ktlint.version.get())