Merge pull request #156 from PatilShreyas/139

#139: Refactor ReportAndMetricsFileFinder: collect all files inside nested directories

Author: PatilShreyas

core/src/main/kotlin/dev/shreyaspatil/composeCompilerMetricsGenerator/core/file/ReportAndMetricsFileFinder.kt

@@ -24,6 +24,7 @@
 package dev.shreyaspatil.composeCompilerMetricsGenerator.core.file
 
 import java.io.File
+import java.nio.file.Files
 
 /**
  * Finds reports and metrics files generated by Compose compiler
@@ -33,11 +34,7 @@ import java.io.File
 class ReportAndMetricsFileFinder(
     directory: File,
 ) {
-    private val allFiles =
-        directory
-            .listFiles()
-            ?.filterNotNull()
-            ?: emptyList()
+    private val allFiles = directory.listAllFiles()
 
     fun findBriefStatisticsJsonFile(): List<File> = allFiles.filter { it.name.endsWith(FileSuffixes.MODULE_REPORT_JSON) }
 
@@ -47,6 +44,21 @@ class ReportAndMetricsFileFinder(
 
     fun findClassesReportTxtFile(): List<File> = allFiles.filter { it.name.endsWith(FileSuffixes.CLASSES_REPORT_TXT) }
 
+    private fun File.listAllFiles(): List<File> =
+        buildList {
+            val currentPath = toPath()
+            Files.newDirectoryStream(currentPath).use { directoryStream ->
+                for (entry in directoryStream) {
+                    val file = entry.toFile() ?: continue
+                    if (Files.isDirectory(entry)) {
+                        addAll(file.listAllFiles())
+                    } else {
+                        add(file)
+                    }
+                }
+            }
+        }
+
     object FileSuffixes {
         const val CLASSES_REPORT_TXT = "-classes.txt"
         const val COMPOSABLES_REPORT_TXT = "-composables.txt"