diff --git a/src/application.rs b/src/application.rs
index 456d873..c3e8c2a 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -78,13 +78,16 @@ impl Application for BookManagerApp {
 
         let mut books: Vec<Element<'_, Self::Message>> = vec![];
         if let Some(project) = &self.project {
-            for book in project.books.iter() {
-                books.push(text(book.file_name.clone()).into());
+            for (file_name, _) in project.books.iter() {
+                books.push(text(file_name.clone()).into());
             }
         }
 
-        let left_panel = scrollable(Column::with_children(books).spacing(10).padding(10))
-            .width(Length::Fixed(256.0));
+        let left_panel = column![
+            text(books.len()),
+            scrollable(Column::with_children(books).spacing(10).padding(10))
+                .width(Length::Fixed(256.0))
+        ];
         let right_panel = column![hello_world, controls, active_editor]
             .spacing(10)
             .padding(10);
diff --git a/src/project.rs b/src/project.rs
index 79befec..658565e 100644
--- a/src/project.rs
+++ b/src/project.rs
@@ -1,22 +1,24 @@
-use std::{ffi::OsStr, path::PathBuf};
+use std::{collections::HashMap, ffi::OsStr, path::PathBuf};
 use walkdir::WalkDir;
 
 #[derive(Debug, Clone)]
 pub struct Book {
     pub path: PathBuf,
     pub file_name: String,
+    pub languages: Vec<String>,
 }
 
 #[derive(Debug, Clone)]
 pub struct ProjectState {
     pub path: PathBuf,
-    pub books: Vec<Book>,
+    pub books: HashMap<String, Book>,
 }
 
 impl ProjectState {
     pub fn new(path: PathBuf) -> Self {
-        let mut books = vec![];
-        let book_walker = WalkDir::new(path.join("books")).into_iter();
+        let search_path = path.join("books");
+        let mut books = HashMap::new();
+        let book_walker = WalkDir::new(search_path.clone()).into_iter();
         for entry in book_walker.flatten() {
             if entry.metadata().is_ok_and(|md| md.is_dir()) {
                 continue;
@@ -24,10 +26,34 @@ impl ProjectState {
 
             let extension = entry.path().extension().and_then(OsStr::to_str);
             if extension.is_some_and(|ext| ext.to_lowercase() == "str") {
-                books.push(Book {
-                    path: entry.path().to_owned(),
-                    file_name: entry.file_name().to_str().unwrap().to_owned(),
-                });
+                let language = entry
+                    .path()
+                    .parent()
+                    .unwrap()
+                    .strip_prefix(search_path.clone())
+                    .unwrap()
+                    .to_str()
+                    .unwrap()
+                    .to_owned()
+                    .to_lowercase();
+                let file_name = entry
+                    .file_name()
+                    .to_str()
+                    .unwrap()
+                    .to_owned()
+                    .to_lowercase();
+                books
+                    .entry(file_name.clone())
+                    .and_modify(|b: &mut Book| b.languages.push(language.clone()))
+                    .or_insert(Book {
+                        path: entry.path().to_owned(),
+                        file_name,
+                        languages: vec![language],
+                    });
+                // books.push(Book {
+                //     path: entry.path().to_owned(),
+                //     file_name: entry.file_name().to_str().unwrap().to_owned(),
+                // });
             }
         }