story-kit: start 269_story_file_references_in_web_ui_chat_input

server/src/http/io.rs

@@ -103,6 +103,15 @@ impl IoApi {
         Ok(Json(home))
     }
 
+    /// List all files in the project recursively, respecting .gitignore.
+    #[oai(path = "/io/fs/files", method = "get")]
+    async fn list_project_files(&self) -> OpenApiResult<Json<Vec<String>>> {
+        let files = io_fs::list_project_files(&self.ctx.state)
+            .await
+            .map_err(bad_request)?;
+        Ok(Json(files))
+    }
+
     /// Search the currently open project for files containing the provided query string.
     #[oai(path = "/io/search", method = "post")]
     async fn search_files(
@@ -316,6 +325,53 @@ mod tests {
         );
     }
 
+    // --- list_project_files ---
+
+    #[tokio::test]
+    async fn list_project_files_returns_file_paths() {
+        let dir = TempDir::new().unwrap();
+        std::fs::create_dir(dir.path().join("src")).unwrap();
+        std::fs::write(dir.path().join("src/main.rs"), "fn main() {}").unwrap();
+        std::fs::write(dir.path().join("README.md"), "# readme").unwrap();
+
+        let api = make_api(&dir);
+        let result = api.list_project_files().await.unwrap();
+        let files = &result.0;
+
+        assert!(files.contains(&"README.md".to_string()));
+        assert!(files.contains(&"src/main.rs".to_string()));
+    }
+
+    #[tokio::test]
+    async fn list_project_files_excludes_directories() {
+        let dir = TempDir::new().unwrap();
+        std::fs::create_dir(dir.path().join("subdir")).unwrap();
+        std::fs::write(dir.path().join("file.txt"), "").unwrap();
+
+        let api = make_api(&dir);
+        let result = api.list_project_files().await.unwrap();
+        let files = &result.0;
+
+        assert!(files.contains(&"file.txt".to_string()));
+        // Directories should not appear
+        assert!(!files.iter().any(|f| f == "subdir"));
+    }
+
+    #[tokio::test]
+    async fn list_project_files_returns_sorted_paths() {
+        let dir = TempDir::new().unwrap();
+        std::fs::write(dir.path().join("z_last.txt"), "").unwrap();
+        std::fs::write(dir.path().join("a_first.txt"), "").unwrap();
+
+        let api = make_api(&dir);
+        let result = api.list_project_files().await.unwrap();
+        let files = &result.0;
+
+        let a_idx = files.iter().position(|f| f == "a_first.txt").unwrap();
+        let z_idx = files.iter().position(|f| f == "z_last.txt").unwrap();
+        assert!(a_idx < z_idx);
+    }
+
     // --- list_directory (project-scoped) ---
 
     #[tokio::test]