feat(app): add the list rows and folder navigation model

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 68 insertions, 0 deletions

diff --git a/app/src/main/java/app/passwordstore/ui/list/ListModel.kt b/app/src/main/java/app/passwordstore/ui/list/ListModel.kt
new file mode 100644
index 00000000..9154baa5
--- /dev/null
+++ b/app/src/main/java/app/passwordstore/ui/list/ListModel.kt
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package app.passwordstore.ui.list
+
+import app.passwordstore.ui.compose.crumbsFor
+import java.io.File
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
+
+/**
+ * One list row. [path] is the absolute path and the row's key; [count] is a folder's number of
+ * children, 0 for entries.
+ */
+data class ListRow(val path: String, val label: String, val subtitle: String?, val count: Int)
+
+/** The rows of one folder, or of a search inside it: folders above entries. */
+data class ListRows(
+  val folders: ImmutableList<ListRow> = persistentListOf(),
+  val entries: ImmutableList<ListRow> = persistentListOf(),
+)
+
+/**
+ * Splits [files] (already sorted or ranked) into folder and entry rows for [dir], keeping their
+ * order. Labels and subtitles are relative to [dir]: browsing shows plain names, search results
+ * show where they are. Entries get no username or OTP subtitle: both live inside the encrypted
+ * file, and the list never decrypts.
+ */
+fun listRows(files: List<File>, dir: File): ListRows {
+  val (folders, entries) = files.partition { it.isDirectory }
+  return ListRows(
+    folders
+      .map { ListRow(it.absolutePath, it.relativeTo(dir).path, null, childCount(it)) }
+      .toImmutableList(),
+    entries
+      .map {
+        val parent = it.parentFile?.relativeTo(dir)?.path.orEmpty()
+        ListRow(it.absolutePath, it.name.removeSuffix(".gpg"), parent.ifEmpty { null }, 0)
+      }
+      .toImmutableList(),
+  )
+}
+
+/** Children counted for a folder: subfolders and .gpg files, as the old list counted them. */
+private fun childCount(folder: File): Int =
+  folder.listFiles { f -> f.isDirectory || f.extension == "gpg" }?.size ?: 0
+
+/**
+ * How to get from the list at [from] to the list at [to] (both relative to the store root) while
+ * the back stack holds one entry per folder level: how many entries to pop, then which paths to
+ * push. Breadcrumb jumps only pop; opening a folder from search results may pop and push.
+ */
+fun folderMoves(from: String, to: String): Pair<Int, List<String>> {
+  val current = crumbsFor(from)
+  val target = crumbsFor(to)
+  val shared = current.zip(target).takeWhile { (a, b) -> a == b }.size
+  return (current.size - shared) to target.drop(shared).map { it.path }
+}
diff --git a/app/src/main/java/app/passwordstore/util/viewmodel/SearchableRepositoryViewModel.kt b/app/src/main/java/app/passwordstore/util/viewmodel/SearchableRepositoryViewModel.kt
index 48804e7a..ca570dc4 100644
--- a/app/src/main/java/app/passwordstore/util/viewmodel/SearchableRepositoryViewModel.kt
+++ b/app/src/main/java/app/passwordstore/util/viewmodel/SearchableRepositoryViewModel.kt
@@ -24,6 +24,7 @@ import androidx.recyclerview.widget.RecyclerView
 import app.passwordstore.data.password.PasswordItem
 import app.passwordstore.data.repo.PasswordRepository
 import app.passwordstore.injection.prefs.SettingsPreferences
+import app.passwordstore.ui.list.listRows
 import app.passwordstore.util.autofill.AutofillPreferences
 import app.passwordstore.util.checkMainThread
 import app.passwordstore.util.coroutines.DispatcherProvider
@@ -302,6 +303,12 @@ constructor(
   private val _currentDir = MutableStateFlow(root)
   val currentDir = _currentDir.asStateFlow()
 
+  /** [searchResult] as folder and entry rows for the Compose list, built off the main thread. */
+  val rows =
+    searchResult
+      .map { result -> listRows(result.passwordItems.map { it.file }, currentDir.value) }
+      .flowOn(dispatcherProvider.io())
+
   data class NavigationStackEntry(val dir: File, val recyclerViewState: Parcelable?)
 
   private val navigationStack = ArrayDeque<NavigationStackEntry>()