fix: save as new file when file already exists

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Fixed
 - Fixed files from hidden folders showing up in storage tab browser ([#217])
+- Fixed an issue where existing files were overwritten when saving new files ([#131])
 
 ## [1.3.0] - 2025-09-30
 ### Added
@@ -96,6 +97,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#250]: https://github.com/FossifyOrg/File-Manager/issues/250
 [#251]: https://github.com/FossifyOrg/File-Manager/issues/251
 [#267]: https://github.com/FossifyOrg/File-Manager/issues/267
+[#131]: https://github.com/FossifyOrg/File-Manager/issues/131
 
 [Unreleased]: https://github.com/FossifyOrg/File-Manager/compare/1.3.0...HEAD
 [1.3.0]: https://github.com/FossifyOrg/File-Manager/compare/1.2.3...1.3.0

app/src/main/kotlin/org/fossify/filemanager/activities/SaveAsActivity.kt

@@ -58,7 +58,7 @@ class SaveAsActivity : SimpleActivity() {
                                 ?: filename.getMimeType()
                             val inputStream = contentResolver.openInputStream(source)
 
-                            val destinationPath = "$destination/$filename"
+                            val destinationPath = getAvailablePath("$destination/$filename")
                             val outputStream = getFileOutputStreamSync(destinationPath, mimeType, null)!!
                             inputStream!!.copyTo(outputStream)
                             rescanPaths(arrayListOf(destinationPath))
@@ -86,4 +86,31 @@ class SaveAsActivity : SimpleActivity() {
         return filename.replace("[/\\\\<>:\"|?*\u0000-\u001F]".toRegex(), "_")
             .takeIf { it.isNotBlank() } ?: "unnamed_file"
     }
+
+    private fun getAvailablePath(destinationPath: String): String {
+        if (!getDoesFilePathExist(destinationPath)) {
+            return destinationPath
+        }
+
+        val file = File(destinationPath)
+        return findAvailableName(file)
+    }
+
+    private fun findAvailableName(file: File): String {
+        val parent = file.parent ?: return file.absolutePath
+        val name = file.nameWithoutExtension
+        val ext = if (file.extension.isNotEmpty()) ".${file.extension}" else ""
+
+        var index = 1
+        var newFile: File
+
+        do {
+            val newName = "${name}_${index}$ext"
+            newFile = File(parent, newName)
+            index++
+        } while (newFile.exists())
+
+        return newFile.absolutePath
+    }
+
 }