From 69a964538a702413d96e06c93f3395c7ee4630ea Mon Sep 17 00:00:00 2001
From: YUNCHANGHYUK <primegoon3757@naver.com>
Date: Sun, 5 Oct 2025 23:06:37 +0900
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20[FEATURE]=20#18=20=EC=9B=B9?=
 =?UTF-8?q?=EC=97=90=EC=84=9C=20=EC=82=AC=EC=9A=A9=ED=95=98=EB=8A=94=20?=
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MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .env.example      |   2 +-
 .gitignore        |  16 +-
 README.md         |  47 ++-
 package-lock.json | 806 ++++++++++++++++++++++++++++++++++++++++++++++
 package.json      |  23 ++
 public/index.html | 567 ++++++++++++++++++++++++++++++++
 server.js         | 115 +++++++
 7 files changed, 1546 insertions(+), 30 deletions(-)
 create mode 100644 package-lock.json
 create mode 100644 package.json
 create mode 100644 public/index.html
 create mode 100644 server.js

diff --git a/.env.example b/.env.example
index 6faed1f..e29aec5 100644
--- a/.env.example
+++ b/.env.example
@@ -1 +1 @@
-GOOGLE_API_KEY=YOUR_API_KEY
\ No newline at end of file
+GOOGLE_API_KEY=YOUR_API_KEY
diff --git a/.gitignore b/.gitignore
index 0382ed1..1ca9da9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,19 @@
+# Dependencies
 node_modules/
-*.log
+
+# Environment variables
 .env
+
+# Logs
+*.log
+
+# OS generated files
 .DS_Store
+Thumbs.db
+
+# Temporary files
 *.tmp
+
+# Build outputs
 dist/
-build/
\ No newline at end of file
+build/
diff --git a/README.md b/README.md
index 521ca26..85a0cbd 100644
--- a/README.md
+++ b/README.md
@@ -1,37 +1,30 @@
-# Insight Project
+# Plain AI - RSI 진단 분석 채팅
 
-새로운 프로젝트입니다.
+Gemini AI를 활용한 웹 기반 채팅 인터페이스
 
-## 시작하기
+## 설치 및 실행
 
-이 프로젝트에 대한 설명을 여기에 작성하세요.
+```bash
+# 1. 저장소 클론
+git clone https://github.com/Plain-Insight/plain_ai.git
+cd plain_ai
 
-## 환경 설정
+# 2. Node.js 의존성 설치
+npm install
 
-1. Python 3.13 이상이 설치되어 있는지 확인하세요.
+# 3. 환경변수 설정
+cp .env.example .env
+# .env 파일을 열어서 GOOGLE_API_KEY=your_api_key_here 입력
 
-2. 필요한 패키지를 설치하세요:
-
-   ```shell
-   pip install -r requirements.txt
-   ```
-
-3. 환경 변수 설정:
-
-   - `.env.example` 파일을 복사하여 `.env` 파일을 생성하세요:
-
-     ```shell
-     cp .env.example .env
-     ```
-
-   - `.env` 파일을 열고 `GOOGLE_API_KEY`에 실제 Google Generative AI API 키를 입력하세요.
+# 4. 서버 실행
+npm start
+```
 
-## 사용법
+## 접속
 
-`api.py`를 실행하여 Gemini AI와 채팅을 시작하세요:
+브라우저에서 <http://localhost:3000> 접속
 
-```shell
-python api.py
-```
+## 요구사항
 
-채팅 중 'quit'라고 입력하면 종료됩니다.
+- Node.js 16+
+- Google Gemini API 키
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..a0a0cfe
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,806 @@
+{
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+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "plain_ai",
+      "version": "1.0.0",
+      "license": "ISC",
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+        "@google/generative-ai": "^0.2.1",
+        "cors": "^2.8.5",
+        "dotenv": "^16.3.1",
+        "express": "^4.18.2"
+      }
+    },
+    "node_modules/@google/generative-ai": {
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+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..b7e33e6
--- /dev/null
+++ b/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "plain_ai",
+  "version": "1.0.0",
+  "description": "Gemini AI 채팅 웹 애플리케이션",
+  "main": "server.js",
+  "directories": {
+    "doc": "docs"
+  },
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": ["ai", "chatbot", "gemini", "web"],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.18.2",
+    "dotenv": "^16.3.1",
+    "@google/generative-ai": "^0.2.1",
+    "cors": "^2.8.5"
+  }
+}
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..f73b0bc
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,567 @@
+<!DOCTYPE html>
+<html lang="ko">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>AI 진단 분석</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', sans-serif;
+            background: #0a0a0a;
+            color: #ffffff;
+            height: 100vh;
+            overflow: hidden;
+        }
+
+        .main-container {
+            display: flex;
+            height: 100vh;
+        }
+
+        .sidebar {
+            width: 300px;
+            background: #1a1a1a;
+            border-right: 1px solid #333;
+            display: flex;
+            flex-direction: column;
+        }
+
+        .sidebar-header {
+            padding: 20px;
+            border-bottom: 1px solid #333;
+            display: flex;
+            align-items: center;
+            gap: 12px;
+        }
+
+        .sidebar-header .icon {
+            width: 24px;
+            height: 24px;
+            background: #4CAF50;
+            border-radius: 4px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 14px;
+        }
+
+        .sidebar-title {
+            font-size: 16px;
+            font-weight: 600;
+            color: #ffffff;
+        }
+
+        .chat-list {
+            flex: 1;
+            padding: 20px;
+        }
+
+        .chat-item {
+            background: #2a5a8a;
+            border-radius: 12px;
+            padding: 16px;
+            margin-bottom: 12px;
+            cursor: pointer;
+            transition: all 0.2s;
+        }
+
+        .chat-item:hover {
+            background: #3a6a9a;
+        }
+
+        .chat-item.active {
+            background: #4a7aaa;
+        }
+
+        .chat-item-title {
+            font-size: 14px;
+            font-weight: 500;
+            margin-bottom: 8px;
+            color: #ffffff;
+        }
+
+        .chat-item-preview {
+            font-size: 12px;
+            color: #b3b3b3;
+            opacity: 0.8;
+        }
+
+        .main-content {
+            flex: 1;
+            display: flex;
+            flex-direction: column;
+            background: #0a0a0a;
+        }
+
+        .chat-header {
+            padding: 20px 24px;
+            border-bottom: 1px solid #333;
+            background: #1a1a1a;
+        }
+
+        .chat-title {
+            font-size: 24px;
+            font-weight: 700;
+            color: #ffffff;
+            text-align: center;
+        }
+
+        .status-bar {
+            padding: 12px 24px;
+            background: #1a1a1a;
+            border-bottom: 1px solid #333;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+        }
+
+        .status-item {
+            display: flex;
+            align-items: center;
+            gap: 8px;
+            background: #2a2a2a;
+            padding: 8px 16px;
+            border-radius: 20px;
+            font-size: 12px;
+        }
+
+        .status-badge {
+            width: 20px;
+            height: 20px;
+            border-radius: 50%;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 10px;
+            font-weight: bold;
+            color: #ffffff;
+        }
+
+        .status-badge.green { background: #4CAF50; }
+        .status-badge.blue { background: #2196F3; }
+        .status-badge.red { background: #f44336; }
+
+        .chat-messages {
+            flex: 1;
+            padding: 24px;
+            overflow-y: auto;
+            background: #0a0a0a;
+        }
+
+        .message {
+            margin-bottom: 20px;
+            display: flex;
+            flex-direction: column;
+        }
+
+        .message.user {
+            align-items: flex-end;
+        }
+
+        .message.ai {
+            align-items: flex-start;
+        }
+
+        .message-content {
+            max-width: 70%;
+            padding: 16px 20px;
+            border-radius: 16px;
+            font-size: 14px;
+            line-height: 1.5;
+            word-wrap: break-word;
+        }
+
+        .message.user .message-content {
+            background: #2a5a8a;
+            color: #ffffff;
+        }
+
+        .message.ai .message-content {
+            background: #2a2a2a;
+            color: #ffffff;
+            border: 1px solid #444;
+        }
+
+        .message-time {
+            font-size: 11px;
+            color: #888;
+            margin-top: 6px;
+            margin-bottom: 4px;
+        }
+
+        .chat-input-container {
+            padding: 24px;
+            background: #1a1a1a;
+            border-top: 1px solid #333;
+        }
+
+        .chat-input-wrapper {
+            background: #2a2a2a;
+            border-radius: 24px;
+            padding: 4px;
+            display: flex;
+            align-items: center;
+            gap: 12px;
+            border: 1px solid #444;
+        }
+
+        .chat-input {
+            flex: 1;
+            background: transparent;
+            border: none;
+            padding: 12px 20px;
+            color: #ffffff;
+            font-size: 14px;
+            outline: none;
+        }
+
+        .chat-input::placeholder {
+            color: #888;
+        }
+
+        .send-button {
+            width: 40px;
+            height: 40px;
+            background: #4CAF50;
+            border: none;
+            border-radius: 50%;
+            cursor: pointer;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            transition: all 0.2s;
+            margin-right: 4px;
+        }
+
+        .send-button:hover {
+            background: #45a049;
+            transform: scale(1.05);
+        }
+
+        .send-button:disabled {
+            opacity: 0.6;
+            cursor: not-allowed;
+            transform: none;
+        }
+
+        .loading {
+            display: none;
+            text-align: center;
+            padding: 16px;
+            color: #888;
+            font-size: 14px;
+        }
+
+        .loading.show {
+            display: block;
+        }
+
+        .connection-status {
+            padding: 12px 24px;
+            text-align: center;
+            font-size: 12px;
+            background: #1a4a1a;
+            color: #4CAF50;
+            border-bottom: 1px solid #2a5a2a;
+        }
+
+        .connection-status.error {
+            background: #4a1a1a;
+            color: #f44336;
+            border-bottom-color: #5a2a2a;
+        }
+
+        .bottom-tabs {
+            display: flex;
+            background: #1a1a1a;
+            border-top: 1px solid #333;
+        }
+
+        .tab {
+            flex: 1;
+            padding: 16px;
+            text-align: center;
+            font-size: 12px;
+            color: #888;
+            cursor: pointer;
+            transition: all 0.2s;
+        }
+
+        .tab.active {
+            color: #4CAF50;
+            background: #0a2a0a;
+        }
+
+        @media (max-width: 768px) {
+            .sidebar {
+                display: none;
+            }
+            
+            .main-content {
+                width: 100%;
+            }
+            
+            .message-content {
+                max-width: 85%;
+            }
+        }
+    </style>
+</head>
+<body>
+    <div class="main-container">
+        <div class="sidebar">
+            <div class="sidebar-header">
+                <div class="icon">🤖</div>
+                <div class="sidebar-title">AI 진단 분석</div>
+            </div>
+            <div class="chat-list">
+                <div class="chat-item active">
+                    <div class="chat-item-title">RSI 30 이하 매수, 70 이상 매도</div>
+                    <div class="chat-item-preview">RSI 진단을 분석했습니다. 다음 조건들을 추천드립니다.</div>
+                </div>
+                <div class="chat-item">
+                    <div class="chat-item-title">RSI 70 이상 매도</div>
+                </div>
+                <div class="chat-item">
+                    <div class="chat-item-title">RSI 30 이하 매수</div>
+                </div>
+                <div class="chat-item">
+                    <div class="chat-item-title">RSI 중성적 방향</div>
+                </div>
+            </div>
+        </div>
+
+        <div class="main-content">
+            <div class="chat-header">
+                <div class="chat-title">전략 생성</div>
+            </div>
+            
+            <div class="status-bar">
+                <div class="status-item">
+                    <span>중복 필터</span>
+                    <div class="status-badge green">0</div>
+                </div>
+                <div class="status-item">
+                    <span>매수 조건</span>
+                    <div class="status-badge blue">0</div>
+                </div>
+                <div class="status-item">
+                    <span>매도 조건</span>
+                    <div class="status-badge red">0</div>
+                </div>
+            </div>
+            
+            <div id="connectionStatus" class="connection-status">
+                연결 중...
+            </div>
+            
+            <div class="chat-messages" id="chatMessages">
+                <div class="message ai">
+                    <div class="message-content">
+                        안녕하세요! 저는 AI 진단 분석 시스템입니다. 투자 전략과 RSI 분석에 대해 무엇이든 물어보세요! �
+                    </div>
+                    <div class="message-time" id="welcomeTime"></div>
+                </div>
+            </div>
+            
+            <div class="loading" id="loading">
+                AI가 분석하고 있습니다...
+            </div>
+            
+            <div class="chat-input-container">
+                <form id="chatForm">
+                    <div class="chat-input-wrapper">
+                        <input 
+                            type="text" 
+                            class="chat-input" 
+                            id="messageInput" 
+                            placeholder="질문을 자유로이 입력하세요..." 
+                            autocomplete="off"
+                        >
+                        <button type="submit" class="send-button" id="sendButton">
+                            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                                <line x1="22" y1="2" x2="11" y2="13"></line>
+                                <polygon points="22,2 15,22 11,13 2,9"></polygon>
+                            </svg>
+                        </button>
+                    </div>
+                </form>
+            </div>
+            
+            <div class="bottom-tabs">
+                <div class="tab active">RSI 전략</div>
+                <div class="tab">골든크로스 전략</div>
+                <div class="tab">볼린저밴드 전략</div>
+            </div>
+        </div>
+    </div>
+
+    <script>
+        class ChatApp {
+            constructor() {
+                this.sessionId = null;
+                this.messageInput = document.getElementById('messageInput');
+                this.chatMessages = document.getElementById('chatMessages');
+                this.sendButton = document.getElementById('sendButton');
+                this.loading = document.getElementById('loading');
+                this.connectionStatus = document.getElementById('connectionStatus');
+                this.chatForm = document.getElementById('chatForm');
+                
+                this.init();
+            }
+
+            async init() {
+                // 환영 메시지 시간 설정
+                document.getElementById('welcomeTime').textContent = this.getCurrentTime();
+                
+                // 이벤트 리스너 설정
+                this.chatForm.addEventListener('submit', (e) => this.handleSubmit(e));
+                this.messageInput.addEventListener('keydown', (e) => {
+                    if (e.key === 'Enter' && !e.shiftKey) {
+                        e.preventDefault();
+                        this.handleSubmit(e);
+                    }
+                });
+
+                // 채팅 아이템 클릭 이벤트
+                document.querySelectorAll('.chat-item').forEach(item => {
+                    item.addEventListener('click', () => {
+                        document.querySelectorAll('.chat-item').forEach(i => i.classList.remove('active'));
+                        item.classList.add('active');
+                    });
+                });
+
+                // 탭 클릭 이벤트
+                document.querySelectorAll('.tab').forEach(tab => {
+                    tab.addEventListener('click', () => {
+                        document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
+                        tab.classList.add('active');
+                    });
+                });
+
+                // 채팅 세션 시작
+                await this.startChatSession();
+            }
+
+            async startChatSession() {
+                try {
+                    const response = await fetch('/api/start-chat', {
+                        method: 'POST',
+                        headers: {
+                            'Content-Type': 'application/json'
+                        }
+                    });
+
+                    const data = await response.json();
+                    
+                    if (data.success) {
+                        this.sessionId = data.sessionId;
+                        this.updateConnectionStatus('연결됨 ✅', false);
+                        this.messageInput.focus();
+                    } else {
+                        throw new Error(data.error);
+                    }
+                } catch (error) {
+                    console.error('채팅 세션 시작 오류:', error);
+                    this.updateConnectionStatus('연결 실패 ❌ - API 키를 확인하세요', true);
+                }
+            }
+
+            async handleSubmit(e) {
+                e.preventDefault();
+                
+                const message = this.messageInput.value.trim();
+                if (!message || !this.sessionId) return;
+
+                // 사용자 메시지 추가
+                this.addMessage(message, 'user');
+                this.messageInput.value = '';
+                this.setLoading(true);
+
+                try {
+                    const response = await fetch('/api/send-message', {
+                        method: 'POST',
+                        headers: {
+                            'Content-Type': 'application/json'
+                        },
+                        body: JSON.stringify({
+                            sessionId: this.sessionId,
+                            message: message
+                        })
+                    });
+
+                    const data = await response.json();
+                    
+                    if (data.success) {
+                        this.addMessage(data.response, 'ai');
+                    } else {
+                        throw new Error(data.error);
+                    }
+                } catch (error) {
+                    console.error('메시지 전송 오류:', error);
+                    this.addMessage('죄송합니다. 오류가 발생했습니다. 다시 시도해주세요.', 'ai');
+                } finally {
+                    this.setLoading(false);
+                }
+            }
+
+            addMessage(content, sender) {
+                const messageDiv = document.createElement('div');
+                messageDiv.className = `message ${sender}`;
+                
+                const contentDiv = document.createElement('div');
+                contentDiv.className = 'message-content';
+                contentDiv.textContent = content;
+                
+                const timeDiv = document.createElement('div');
+                timeDiv.className = 'message-time';
+                timeDiv.textContent = this.getCurrentTime();
+                
+                messageDiv.appendChild(contentDiv);
+                messageDiv.appendChild(timeDiv);
+                
+                this.chatMessages.appendChild(messageDiv);
+                this.scrollToBottom();
+            }
+
+            setLoading(isLoading) {
+                if (isLoading) {
+                    this.loading.classList.add('show');
+                    this.sendButton.disabled = true;
+                } else {
+                    this.loading.classList.remove('show');
+                    this.sendButton.disabled = false;
+                    this.messageInput.focus();
+                }
+            }
+
+            updateConnectionStatus(message, isError) {
+                this.connectionStatus.textContent = message;
+                this.connectionStatus.className = `connection-status ${isError ? 'error' : ''}`;
+            }
+
+            getCurrentTime() {
+                return new Date().toLocaleTimeString('ko-KR', {
+                    hour: '2-digit',
+                    minute: '2-digit'
+                });
+            }
+
+            scrollToBottom() {
+                this.chatMessages.scrollTop = this.chatMessages.scrollHeight;
+            }
+        }
+
+        // 애플리케이션 시작
+        document.addEventListener('DOMContentLoaded', () => {
+            new ChatApp();
+        });
+    </script>
+</body>
+</html>
\ No newline at end of file
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..fae83da
--- /dev/null
+++ b/server.js
@@ -0,0 +1,115 @@
+const express = require('express');
+const cors = require('cors');
+const path = require('path');
+require('dotenv').config();
+
+const { GoogleGenerativeAI } = require('@google/generative-ai');
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+// 미들웨어 설정
+app.use(cors());
+app.use(express.json());
+app.use(express.static('public'));
+
+// Google Generative AI 설정
+const genAI = new GoogleGenerativeAI(process.env.GOOGLE_API_KEY);
+const model = genAI.getGenerativeModel({ model: "gemini-2.0-flash-lite" });
+
+// 채팅 세션 저장을 위한 Map (실제 서비스에서는 데이터베이스 사용 권장)
+const chatSessions = new Map();
+
+// 루트 라우트 - index.html 제공
+app.get('/', (req, res) => {
+    res.sendFile(path.join(__dirname, 'public', 'index.html'));
+});
+
+// 새로운 채팅 세션 시작
+app.post('/api/start-chat', async (req, res) => {
+    try {
+        const sessionId = Date.now().toString(); // 간단한 세션 ID 생성
+        const chat = model.startChat({
+            history: [],
+            generationConfig: {
+                maxOutputTokens: 1000,
+            },
+        });
+        
+        chatSessions.set(sessionId, chat);
+        
+        res.json({ 
+            success: true, 
+            sessionId: sessionId,
+            message: "새로운 채팅 세션이 시작되었습니다!" 
+        });
+    } catch (error) {
+        console.error('채팅 세션 시작 오류:', error);
+        res.status(500).json({ 
+            success: false, 
+            error: '채팅 세션을 시작할 수 없습니다.' 
+        });
+    }
+});
+
+// 메시지 전송 및 응답 받기
+app.post('/api/send-message', async (req, res) => {
+    try {
+        const { sessionId, message } = req.body;
+        
+        if (!sessionId || !message) {
+            return res.status(400).json({ 
+                success: false, 
+                error: '세션 ID와 메시지가 필요합니다.' 
+            });
+        }
+        
+        const chat = chatSessions.get(sessionId);
+        if (!chat) {
+            return res.status(404).json({ 
+                success: false, 
+                error: '유효하지 않은 세션 ID입니다.' 
+            });
+        }
+        
+        const result = await chat.sendMessage(message);
+        const response = await result.response;
+        const text = response.text();
+        
+        res.json({ 
+            success: true, 
+            response: text 
+        });
+        
+    } catch (error) {
+        console.error('메시지 전송 오류:', error);
+        res.status(500).json({ 
+            success: false, 
+            error: '메시지를 처리할 수 없습니다.' 
+        });
+    }
+});
+
+// 채팅 세션 종료
+app.delete('/api/end-chat/:sessionId', (req, res) => {
+    const { sessionId } = req.params;
+    
+    if (chatSessions.has(sessionId)) {
+        chatSessions.delete(sessionId);
+        res.json({ 
+            success: true, 
+            message: '채팅 세션이 종료되었습니다.' 
+        });
+    } else {
+        res.status(404).json({ 
+            success: false, 
+            error: '유효하지 않은 세션 ID입니다.' 
+        });
+    }
+});
+
+// 서버 시작
+app.listen(PORT, () => {
+    console.log(`서버가 http://localhost:${PORT} 에서 실행 중입니다.`);
+    console.log('GOOGLE_API_KEY가 설정되어 있는지 확인하세요.');
+});
\ No newline at end of file