From 7917fa08cc6afd66469b6b70025ca68d155766a7 Mon Sep 17 00:00:00 2001
From: MDietermann <marvin.dietermann@hive-brain.de>
Date: Fri, 28 Aug 2026 10:49:15 +0200
Subject: [PATCH] feat: Notiz-Baum in der Datei-Leiste

Setzt Issue #7 um und schliesst damit die Workspace-Map ab. Die files-bar
zeigt nicht mehr zwei Platzhalter-Routen, sondern den rekursiv eingelesenen
Inhalt des offenen Workspace.

TreeNode ist ein verschachteltes Enum mit einer einzigen File-Variante fuer
alle Dateitypen - wer wissen will, ob es eine Notiz ist, fragt
path.extension(). Aufgebaut wird ueber std::fs::read_dir mit eigener
Rekursion; walkdir liegt zwar im Graph, iteriert aber flach, woraus einen
Baum zu bauen mehr Code waere.

Eingesammelt wird alles ausser Namen mit fuehrendem Punkt - Dateien wie
Ordner, womit .dionotes und .git ohne Ausnahmeliste wegfallen - und ausser
Symlinks, deren Verfolgung einen Zyklusschutz erfordern wuerde. Leere Ordner
werden angezeigt, sortiert wird Ordner-vor-Dateien und alphabetisch ohne
Ruecksicht auf Gross-/Kleinschreibung.

Der Aufklapp-Zustand liegt als HashSet<PathBuf> neben dem Baum, nicht darin:
Es gibt keinen Filewatcher, der Nutzer liest bei Bedarf neu ein - steckte
expanded im Knoten, klappte jeder Refresh saemtliche Ordner zu. Persistiert
wird er nicht.

Mit dem Baum entfaellt die Tab-Leiste im Editor und damit EDITOR_TABS, der
letzte Rest des in #5 dokumentierten Pflegepunkts. strum wird dadurch
nirgends mehr gebraucht und faellt samt strum_macros aus dem Graph.

Ausserdem entfernt: der Dioxus-Vorlagentext Hero samt header.svg, der nach
dem Oeffnen eines Workspace die rechte Haelfte mit ungestylten Werbelinks
fuellte. Home ist jetzt ein Empty-State.
---
 Cargo.lock                          |  22 ----
 Cargo.toml                          |   1 -
 assets/css/components.css           |  33 ++++-
 assets/css/layout.css               |  16 +++
 assets/header.svg                   |  20 ---
 src/main.rs                         |   1 +
 src/route.rs                        |  14 +-
 src/tree.rs                         | 194 ++++++++++++++++++++++++++++
 src/views/editor/dionotes_editor.rs | 129 +++++++++++++-----
 9 files changed, 338 insertions(+), 92 deletions(-)
 delete mode 100644 assets/header.svg
 create mode 100644 src/tree.rs

diff --git a/Cargo.lock b/Cargo.lock
index 9144dc6..60e3ce2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2333,7 +2333,6 @@ dependencies = [
  "rfd",
  "ron",
  "serde",
- "strum",
  "tokio",
 ]
 
@@ -6414,27 +6413,6 @@ dependencies = [
  "quote",
 ]
 
-[[package]]
-name = "strum"
-version = "0.28.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9628de9b8791db39ceda2b119bbe13134770b56c138ec1d3af810d045c04f9bd"
-dependencies = [
- "strum_macros",
-]
-
-[[package]]
-name = "strum_macros"
-version = "0.28.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab85eea0270ee17587ed4156089e10b9e6880ee688791d45a905f5b1ca36f664"
-dependencies = [
- "heck 0.5.0",
- "proc-macro2",
- "quote",
- "syn 2.0.119",
-]
-
 [[package]]
 name = "subsecond"
 version = "0.7.10"
diff --git a/Cargo.toml b/Cargo.toml
index 3e02918..9b01ecb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,6 @@ dirs = "6.0.0"
 rfd = { version = "0.17.2", default-features = false, features = ["xdg-portal"] }
 ron = "0.12.2"
 serde = { version = "1.0.229", features = ["derive"] }
-strum = { version = "0.28.0", features = ["derive"] }
 tokio = { version = "1.53.1", features = ["rt"] }
 
 [features]
diff --git a/assets/css/components.css b/assets/css/components.css
index a47eeaa..fcf885a 100644
--- a/assets/css/components.css
+++ b/assets/css/components.css
@@ -9,8 +9,18 @@
 
 .file-selector {
     position: relative;
-    display: block;
-    padding: var(--dn-space-1) var(--dn-space-2) var(--dn-space-1) var(--dn-space-3);
+    display: flex;
+    align-items: center;
+    gap: var(--dn-space-1);
+    /* Einrückung pro Baumebene — --depth setzt die Komponente je Knoten. */
+    padding: var(--dn-space-1) var(--dn-space-2) var(--dn-space-1)
+             calc(var(--dn-space-3) + var(--depth, 0) * var(--dn-space-4));
+    /* Als <button> im Baum: Browser-Vorgaben zurücknehmen. */
+    width: 100%;
+    border: 0;
+    background: transparent;
+    text-align: left;
+    cursor: pointer;
     border-radius: var(--dn-radius-sm);
     color: var(--dn-fg-muted);
     font-family: var(--dn-font-code);
@@ -23,6 +33,19 @@
                 background-color var(--dn-dur-fast) var(--dn-ease);
 }
 
+/* Das Dreieck hält seinen Platz auch bei Dateien, damit Ordner- und
+   Dateinamen derselben Ebene bündig stehen. */
+.tree-caret {
+    flex: none;
+    width: 0.9em;
+    color: var(--dn-fg-faint);
+    font-size: 0.8em;
+}
+
+.file-selector.is-folder {
+    color: var(--dn-fg);
+}
+
 .file-selector::before {
     content: "";
     position: absolute;
@@ -88,6 +111,12 @@
     border-color: transparent;
 }
 
+/* Quadratischer Knopf für ein einzelnes Zeichen — Refresh, Schließen. */
+.btn-icon {
+    padding: var(--dn-space-1) var(--dn-space-2);
+    line-height: 1;
+}
+
 .btn-ghost:hover:not(:disabled) {
     background: var(--dn-bg-raised);
     border-color: transparent;
diff --git a/assets/css/layout.css b/assets/css/layout.css
index 97e7cc3..79dbd95 100644
--- a/assets/css/layout.css
+++ b/assets/css/layout.css
@@ -80,6 +80,22 @@
     overscroll-behavior: contain;
 }
 
+/* Kopfzeile der Datei-Leiste: Beschriftung und Neu-einlesen. Bleibt stehen,
+   während der Baum darunter scrollt. */
+.files-bar-head {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: var(--dn-space-2);
+    padding: var(--dn-space-1) var(--dn-space-1) var(--dn-space-1) var(--dn-space-2);
+}
+
+.files-bar-empty {
+    padding: var(--dn-space-3) var(--dn-space-2);
+    color: var(--dn-fg-faint);
+    font-size: var(--dn-text-xs);
+}
+
 .editor-container {
     flex: 1;
     min-width: 0;
diff --git a/assets/header.svg b/assets/header.svg
deleted file mode 100644
index 59c96f2..0000000
--- a/assets/header.svg
+++ /dev/null
@@ -1,20 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 1007 197"><style>
-@keyframes a0_t { 0% { transform: translate(225px,339.9px) scale(0,1) translate(-89.5px,-24px); } 35% { transform: translate(225px,339.9px) scale(0,1) translate(-89.5px,-24px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 45% { transform: translate(225px,339.9px) scale(1,1) translate(-89.5px,-24px); } 50% { transform: translate(225px,339.9px) scale(1,1) translate(-89.5px,-24px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 60% { transform: translate(225px,339.9px) scale(0,1) translate(-89.5px,-24px); } 100% { transform: translate(225px,339.9px) scale(0,1) translate(-89.5px,-24px); } }
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-@keyframes a2_t { 0% { transform: translate(-200px,-167px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 10% { transform: translate(-150px,-80px); } 20% { transform: translate(-150px,-80px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 30% { transform: translate(-200px,-123px); } 35% { transform: translate(-200px,-123px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 45% { transform: translate(-150px,-100px); } 50% { transform: translate(-150px,-100px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 60% { transform: translate(-150px,-80px); } 65% { transform: translate(-150px,-80px); animation-timing-function: cubic-bezier(.6,0,.4,1); } 75% { transform: translate(-217px,-200px); } 100% { transform: translate(-217px,-200px); } }
-@keyframes a2_o { 0% { opacity: 0; animation-timing-function: cubic-bezier(.6,0,.4,1); } 10% { opacity: 1; } 65% { opacity: 1; animation-timing-function: cubic-bezier(.6,0,.4,1); } 75% { opacity: 0; } 100% { opacity: 0; } }
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-@keyframes a2_w { 0% { width: 400px; animation-timing-function: cubic-bezier(.6,0,.4,1); } 10% { width: 300px; } 20% { width: 300px; animation-timing-function: cubic-bezier(.6,0,.4,1); } 30% { width: 400px; } 35% { width: 400px; animation-timing-function: cubic-bezier(.6,0,.4,1); } 45% { width: 300px; } 50% { width: 300px; } 60% { width: 300px; } 65% { width: 300px; animation-timing-function: cubic-bezier(.6,0,.4,1); } 75% { width: 434px; } 100% { width: 434px; } }
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\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 96e8f36..6091a69 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 mod components;
 mod route;
+mod tree;
 mod views;
 mod workspace;
 mod workspace_list;
diff --git a/src/route.rs b/src/route.rs
index df9b9d4..f5eb852 100644
--- a/src/route.rs
+++ b/src/route.rs
@@ -1,5 +1,4 @@
 use dioxus::prelude::*;
-use strum::EnumMessage;
 
 use crate::views::editor::dionotes_editor::{Editor, EditorShell, Home};
 use crate::views::workspace_selector::selector::Selector;
@@ -9,28 +8,17 @@ use crate::views::workspace_selector::selector::Selector;
 /// Bewusst *ein* Router statt zweier: Zwei Routable-Enums teilen sich dieselbe
 /// History, und beide hatten `/` belegt — beim Umschalten hätte der Editor eine
 /// URL zu sehen bekommen, die er nicht kennt.
-#[derive(Debug, Clone, Routable, PartialEq, EnumMessage)]
+#[derive(Debug, Clone, Routable, PartialEq)]
 #[rustfmt::skip]
 pub enum Route {
     #[nest("/workspace")]
         #[layout(EditorShell)]
             #[route("/")]
-            #[strum(message = "Home")]
             Home {},
             #[route("/editor")]
-            #[strum(message = "Editor")]
             Editor {},
         #[end_layout]
     #[end_nest]
     #[route("/")]
     Selector {},
 }
-
-impl Route {
-    /// Die Einträge der Datei-Leiste im Editor.
-    ///
-    /// Explizit statt über `EnumIter`, weil das Enum jetzt auch den Selector
-    /// enthält und der in dieser Leiste nichts zu suchen hat. Wermutstropfen:
-    /// eine neue Editor-Route hier einzutragen erzwingt der Compiler nicht.
-    pub const EDITOR_TABS: [Self; 2] = [Self::Home {}, Self::Editor {}];
-}
diff --git a/src/tree.rs b/src/tree.rs
new file mode 100644
index 0000000..26f903c
--- /dev/null
+++ b/src/tree.rs
@@ -0,0 +1,194 @@
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+/// Ein Knoten im Notiz-Baum.
+///
+/// Verschachtelt statt flache Arena: Der Baum wird beim Öffnen einmal
+/// aufgebaut und danach nur gelesen — die Indirektion einer Arena zahlt sich
+/// erst aus, wenn Knoten wandern oder sich gegenseitig referenzieren.
+///
+/// Als Enum statt als Struct mit `children: Vec<_>`, weil damit unmöglich
+/// wird, was ein Struct erlaubt: eine Datei mit Kindern.
+///
+/// Eine einzige `File`-Variante für alle Dateitypen. Wer wissen will, ob es
+/// eine Notiz ist, fragt `path.extension()` — das ist eine Zeile an der
+/// Stelle, die es braucht, statt einer Klassifizierung, die der Baum beim
+/// Aufbau festschreibt.
+#[derive(Debug, Clone, PartialEq)]
+pub enum TreeNode {
+    File {
+        name: String,
+        path: PathBuf,
+    },
+    Folder {
+        name: String,
+        path: PathBuf,
+        children: Vec<TreeNode>,
+    },
+}
+
+impl TreeNode {
+    pub fn name(&self) -> &str {
+        match self {
+            Self::File { name, .. } | Self::Folder { name, .. } => name,
+        }
+    }
+
+    pub fn path(&self) -> &Path {
+        match self {
+            Self::File { path, .. } | Self::Folder { path, .. } => path,
+        }
+    }
+
+    pub fn is_folder(&self) -> bool {
+        matches!(self, Self::Folder { .. })
+    }
+}
+
+/// Liest den Inhalt eines Ordners rekursiv ein und liefert seine Kinder.
+///
+/// `std::fs::read_dir` mit eigener Rekursion statt `walkdir`: Letzteres liegt
+/// zwar bereits im Abhängigkeitsgraph, iteriert aber flach — daraus einen
+/// Baum zusammenzusetzen wäre mehr Code, nicht weniger.
+pub fn read_tree(root: &Path) -> io::Result<Vec<TreeNode>> {
+    let mut nodes = Vec::new();
+
+    for entry in fs::read_dir(root)? {
+        let entry = entry?;
+        let name = entry.file_name().to_string_lossy().into_owned();
+
+        // Alles mit führendem Punkt bleibt draußen. Das erledigt `.dionotes`
+        // und `.git` in einem Aufwasch, ohne eine Ausnahmeliste, die bei
+        // `.obsidian` oder `.vscode` wieder wachsen müsste.
+        if name.starts_with('.') {
+            continue;
+        }
+
+        let path = entry.path();
+        // `symlink_metadata` folgt dem Link nicht, `metadata` schon. Symlinks
+        // zu folgen hieße, einen Zyklusschutz über kanonisierte Pfade
+        // mitzuführen — realer Aufwand für einen Fall, den in einem
+        // Notizordner kaum jemand hat, während ein Hänger beim Öffnen für den
+        // Nutzer schwer zu deuten wäre.
+        let Ok(meta) = fs::symlink_metadata(&path) else {
+            continue;
+        };
+        if meta.is_symlink() {
+            continue;
+        }
+
+        if meta.is_dir() {
+            // Ein Unterordner ohne Leserecht wird leer dargestellt, statt den
+            // ganzen Baum scheitern zu lassen.
+            let children = read_tree(&path).unwrap_or_default();
+            nodes.push(TreeNode::Folder { name, path, children });
+        } else {
+            nodes.push(TreeNode::File { name, path });
+        }
+    }
+
+    sort(&mut nodes);
+    Ok(nodes)
+}
+
+/// Ordner zuerst, dann Dateien, jeweils alphabetisch ohne Rücksicht auf
+/// Groß-/Kleinschreibung — die Konvention aus jedem Dateibrowser. `read_dir`
+/// liefert plattformabhängig unsortiert.
+fn sort(nodes: &mut [TreeNode]) {
+    nodes.sort_by(|a, b| {
+        b.is_folder()
+            .cmp(&a.is_folder())
+            .then_with(|| a.name().to_lowercase().cmp(&b.name().to_lowercase()))
+    });
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{read_tree, TreeNode};
+    use std::fs;
+    use std::path::PathBuf;
+
+    fn scratch(name: &str) -> PathBuf {
+        let dir = std::env::temp_dir().join(format!("dionotes-tree-{name}"));
+        let _ = fs::remove_dir_all(&dir);
+        fs::create_dir_all(&dir).expect("Testverzeichnis anlegbar");
+        dir
+    }
+
+    fn names(nodes: &[TreeNode]) -> Vec<&str> {
+        nodes.iter().map(|n| n.name()).collect()
+    }
+
+    #[test]
+    fn folders_come_first_then_files_each_alphabetically() {
+        let dir = scratch("sorting");
+        fs::write(dir.join("zebra.md"), "").unwrap();
+        fs::write(dir.join("Apfel.md"), "").unwrap();
+        fs::create_dir(dir.join("Werkzeug")).unwrap();
+        fs::create_dir(dir.join("archiv")).unwrap();
+
+        let tree = read_tree(&dir).unwrap();
+        // Gross-/Kleinschreibung darf die Reihenfolge nicht bestimmen.
+        assert_eq!(names(&tree), ["archiv", "Werkzeug", "Apfel.md", "zebra.md"]);
+    }
+
+    #[test]
+    fn every_file_type_is_included_not_just_markdown() {
+        let dir = scratch("all-files");
+        fs::write(dir.join("notiz.md"), "").unwrap();
+        fs::write(dir.join("bild.png"), "").unwrap();
+        fs::write(dir.join("ohne-endung"), "").unwrap();
+
+        let tree = read_tree(&dir).unwrap();
+        assert_eq!(names(&tree), ["bild.png", "notiz.md", "ohne-endung"]);
+    }
+
+    #[test]
+    fn dotted_names_are_skipped_files_and_folders_alike() {
+        let dir = scratch("hidden");
+        fs::create_dir_all(dir.join(".dionotes")).unwrap();
+        fs::create_dir_all(dir.join(".git").join("objects")).unwrap();
+        fs::write(dir.join(".gitignore"), "").unwrap();
+        fs::write(dir.join("sichtbar.md"), "").unwrap();
+
+        assert_eq!(names(&read_tree(&dir).unwrap()), ["sichtbar.md"]);
+    }
+
+    #[test]
+    fn empty_folders_are_shown() {
+        let dir = scratch("empty-folder");
+        fs::create_dir(dir.join("leer")).unwrap();
+
+        let tree = read_tree(&dir).unwrap();
+        match &tree[..] {
+            [TreeNode::Folder { name, children, .. }] => {
+                assert_eq!(name, "leer");
+                assert!(children.is_empty());
+            }
+            other => panic!("erwartet ein leerer Ordner, war {other:?}"),
+        }
+    }
+
+    #[test]
+    fn nesting_is_recursive() {
+        let dir = scratch("nested");
+        fs::create_dir_all(dir.join("a").join("b")).unwrap();
+        fs::write(dir.join("a").join("b").join("tief.md"), "").unwrap();
+
+        let tree = read_tree(&dir).unwrap();
+        let TreeNode::Folder { children: a, .. } = &tree[0] else {
+            panic!("erwartet Ordner a");
+        };
+        let TreeNode::Folder { children: b, .. } = &a[0] else {
+            panic!("erwartet Ordner b");
+        };
+        assert_eq!(names(b), ["tief.md"]);
+    }
+
+    #[test]
+    fn missing_root_is_an_error_not_an_empty_tree() {
+        let dir = scratch("no-root").join("gibtsnicht");
+        assert!(read_tree(&dir).is_err());
+    }
+}
diff --git a/src/views/editor/dionotes_editor.rs b/src/views/editor/dionotes_editor.rs
index 7fdc841..3ae8919 100644
--- a/src/views/editor/dionotes_editor.rs
+++ b/src/views/editor/dionotes_editor.rs
@@ -1,38 +1,23 @@
 use dioxus::prelude::*;
 use dioxus_code::Theme;
 use dioxus_code_editor::{CodeEditor, Language};
-use strum::EnumMessage;
+use std::collections::HashSet;
+use std::path::PathBuf;
 
-use crate::components::custom_link::custom_link_component::CustomLink;
 use crate::route::Route;
+use crate::tree::{read_tree, TreeNode};
 use crate::workspace::Workspace;
 
-const HEADER_SVG: Asset = asset!("/assets/header.svg");
-
-/// Home page
+/// Was rechts steht, solange keine Notiz gewählt ist.
+///
+/// TODO: Sobald ein Klick im Baum eine Notiz öffnet, ist das der Ort für den
+/// zuletzt bearbeiteten Stand oder eine Kurzhilfe. Gehört zum Notiz-Handling.
 #[component]
 pub fn Home() -> Element {
     rsx! {
-        Hero {}
-    }
-}
-
-// TODO: Unveränderter Dioxus-Vorlagentext. Ersetzen, sobald klar ist, was
-// beim Öffnen eines Workspace angezeigt wird, bevor eine Notiz gewählt wurde.
-#[component]
-pub fn Hero() -> Element {
-    rsx! {
-        div {
-            id: "hero",
-            img { src: HEADER_SVG, id: "header" }
-            div { id: "links",
-                a { href: "https://dioxuslabs.com/learn/0.7/", "📚 Learn Dioxus" }
-                a { href: "https://dioxuslabs.com/awesome", "🚀 Awesome Dioxus" }
-                a { href: "https://github.com/dioxus-community/", "📡 Community Libraries" }
-                a { href: "https://github.com/DioxusLabs/sdk", "⚙️ Dioxus Development Kit" }
-                a { href: "https://marketplace.visualstudio.com/items?itemName=DioxusLabs.dioxus", "💫 VSCode Extension" }
-                a { href: "https://discord.gg/XgGxMSkvUM", "👋 Community Discord" }
-            }
+        div { class: "empty-state",
+            span { class: "empty-state-title", "Keine Notiz geöffnet" }
+            span { "Wähle links eine Notiz aus." }
         }
     }
 }
@@ -52,7 +37,7 @@ pub fn Editor() -> Element {
     }
 }
 
-/// Die Editor-Hülle: Datei-Leiste links, Editorfläche rechts.
+/// Die Editor-Hülle: Notiz-Baum links, Editorfläche rechts.
 ///
 /// Trägt zugleich den Zustands-Guard — ohne offenen Workspace hat der Editor
 /// nichts anzuzeigen. Der Fall ist real: Hot-Reload setzt den Context zurück,
@@ -68,25 +53,51 @@ pub fn EditorShell() -> Element {
         }
     });
 
+    // Offene Ordner liegen **neben** dem Baum, nicht darin: Es gibt keinen
+    // Filewatcher, der Nutzer liest bei Bedarf neu ein — steckte `expanded`
+    // im Knoten, klappte jeder Refresh sämtliche Ordner zu.
+    let expanded = use_signal(HashSet::<PathBuf>::new);
+
+    // Einlesen auf einem eigenen Thread: Ein Workspace auf einem langsamen
+    // Laufwerk würde die Oberfläche sonst blockieren.
+    let mut tree = use_resource(move || {
+        let root = workspace.read().as_ref().map(|ws| ws.root.clone());
+        async move {
+            let Some(root) = root else {
+                return Vec::new();
+            };
+            tokio::task::spawn_blocking(move || read_tree(&root).unwrap_or_default())
+                .await
+                .unwrap_or_default()
+        }
+    });
+
     if workspace.read().is_none() {
         return rsx! {};
     }
 
+    let nodes = tree.read().clone().unwrap_or_default();
+
     rsx! {
         div {
             class: "layout-container",
             div {
                 class: "files-bar",
-                // TODO: Durch den Notiz-Baum des offenen Workspace ersetzen
-                // (rekursiv eingelesen, aufklappbar). Bis dahin die Routen.
-                for entry in Route::EDITOR_TABS {
-                    CustomLink {
-                        key: "{entry}",
-                        label: entry.get_message().unwrap_or_default(),
-                        href: entry.clone(),
-                        css: "file-selector"
+                div { class: "files-bar-head",
+                    span { class: "field-label", "Notizen" }
+                    // Kein Filewatcher — externe Änderungen holt man sich hier.
+                    button {
+                        class: "btn btn-ghost btn-icon",
+                        title: "Neu einlesen",
+                        onclick: move |_| tree.restart(),
+                        "⟳"
                     }
                 }
+                if nodes.is_empty() {
+                    div { class: "files-bar-empty", "Keine Notizen in diesem Workspace." }
+                } else {
+                    TreeLevel { nodes: nodes.clone(), expanded, depth: 0 }
+                }
             }
             div {
                 class: "editor-container",
@@ -95,3 +106,53 @@ pub fn EditorShell() -> Element {
         }
     }
 }
+
+/// Eine Ebene des Baums. Ruft sich für aufgeklappte Ordner selbst auf.
+#[component]
+fn TreeLevel(nodes: Vec<TreeNode>, expanded: Signal<HashSet<PathBuf>>, depth: usize) -> Element {
+    rsx! {
+        for node in nodes {
+            TreeEntry { key: "{node.path().display()}", node: node.clone(), expanded, depth }
+        }
+    }
+}
+
+#[component]
+fn TreeEntry(node: TreeNode, mut expanded: Signal<HashSet<PathBuf>>, depth: usize) -> Element {
+    let path = node.path().to_path_buf();
+    let name = node.name().to_string();
+    let is_open = expanded.read().contains(&path);
+
+    match node {
+        TreeNode::Folder { children, .. } => {
+            let toggle_path = path.clone();
+            rsx! {
+                button {
+                    class: "file-selector is-folder",
+                    style: "--depth: {depth}",
+                    onclick: move |_| {
+                        let mut open = expanded.write();
+                        if !open.remove(&toggle_path) {
+                            open.insert(toggle_path.clone());
+                        }
+                    },
+                    span { class: "tree-caret", if is_open { "▾" } else { "▸" } }
+                    "{name}"
+                }
+                if is_open {
+                    TreeLevel { nodes: children, expanded, depth: depth + 1 }
+                }
+            }
+        }
+        TreeNode::File { .. } => rsx! {
+            // TODO: Klick öffnet die Notiz im Editor. Gehört zum Notiz-Handling
+            // und damit in den nächsten Effort, nicht in diese Map.
+            button {
+                class: "file-selector",
+                style: "--depth: {depth}",
+                span { class: "tree-caret" }
+                "{name}"
+            }
+        },
+    }
+}