From 5b9b2fc3e0f2f187bbbd934adddf4f7bb19909d3 Mon Sep 17 00:00:00 2001
From: Dmitrii Gridin <dmitry.gridin@jetbrains.com>
Date: Mon, 29 Sep 2025 17:41:26 +0200
Subject: [PATCH] [kotlin] project-model-updater: prettify libraries
 regeneration

To reduce noice and prepare for up-to-date check (KTIJ-35768)

^KTIJ-35777

GitOrigin-RevId: ea7d71f7901cc19462b5d4c0ffbb80bda34e0dc8
---
 .../org/jetbrains/tools/model/updater/Main.kt | 23 +++++++++++++------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/plugins/kotlin/util/project-model-updater/src/org/jetbrains/tools/model/updater/Main.kt b/plugins/kotlin/util/project-model-updater/src/org/jetbrains/tools/model/updater/Main.kt
index 857e25f63782..c47206c4f97f 100644
--- a/plugins/kotlin/util/project-model-updater/src/org/jetbrains/tools/model/updater/Main.kt
+++ b/plugins/kotlin/util/project-model-updater/src/org/jetbrains/tools/model/updater/Main.kt
@@ -100,19 +100,28 @@ fun main(args: Array<String>) {
     updateCoopRunConfiguration(monorepoRoot, communityRoot)
 }
 
-private fun regenerateProjectLibraries(dotIdea: Path, libraries: List<JpsLibrary>, resolverSettings: JpsResolverSettings) {
+private fun regenerateProjectLibraries(dotIdea: Path, newLibraries: List<JpsLibrary>, resolverSettings: JpsResolverSettings) {
     val librariesDir = dotIdea.resolve("libraries")
-    for (it in librariesDir.listDirectoryEntries("kotlinc_*")) {
-        println("Removing $it")
-        it.deleteIfExists()
-    }
+    val oldLibraries = librariesDir.listDirectoryEntries("kotlinc_*").toMutableSet()
 
-    for (library in libraries) {
+    for (library in newLibraries) {
         val libraryFileName = library.name.replace("\\W".toRegex(), "_") + ".xml"
         val xmlFile = librariesDir.resolve(libraryFileName)
-        println("Writing $xmlFile")
+        val isRegeneration = oldLibraries.remove(xmlFile)
+        if (isRegeneration) {
+            println("Rewriting $xmlFile")
+        } else {
+            println("Writing $xmlFile")
+        }
+
         xmlFile.writeText(library.render(resolverSettings))
     }
+
+    // Drop redundant libraries
+    for (redundantLibrary in oldLibraries) {
+        println("Removing $redundantLibrary")
+        redundantLibrary.deleteExisting()
+    }
 }
 
 private fun updateCoopRunConfiguration(monorepoRoot: Path?, communityRoot: Path) {