Gemini CLI

A command-line interface tool for interacting with Google's Gemini AI.

Installation

npm install -g briggs-gemini-cli

First-time Setup

When you run the gemini command for the first time, you'll be prompted to enter your Gemini API key. You can get your API key from Google AI Studio.

Usage

Interactive Mode

Simply run:

gemini

This will start an interactive chat session with Gemini AI. You can:

• Type your questions or prompts in Korean or English
• Press Enter to send
• Type 'exit' or 'quit' to end the session

Single Query Mode

You can also ask a single question:

gemini "What is the capital of France?"
gemini "2024년 AI 동향 알려줘"  # Auto web search for latest info

Configuration

Set your preferred language and Gemini model:

# Change language
gemini
> set language en    # English
> set language ko    # Korean

# Change Gemini model
> set model gemini-2.0-flash
> set model gemini-2.5-pro
> set model gemini-2.0-flash-lite

# View available models
> models

# View current settings
> settings

Smart Web Search

The CLI automatically detects when you need web search and performs intelligent research:

gemini "Latest React 19 features"        # Auto web search
gemini "Compare Python vs JavaScript"    # Technical comparison
gemini "Current AI trends 2024"          # Latest information

Auto web search triggers on:

• Latest news/information requests
• Real-time data queries
• Product/service information
• Technical comparisons and tutorials
• Keywords like "latest", "current", "compare", etc.

Command Reference

Analysis Commands

# Analyze entire project (Korean)
프로젝트 분석해줘

# Analyze entire project (English)
analyze project

# Analyze specific file
[filename] 분석해줘
[filename] analyze

Code Modification

# Modify specific file
[filename] 수정해줘

# Example: Add comments to a function
app.js 수정해줘 - 모든 함수에 주석 추가해줘

Backup Management

# List all backup files
backup list

# Restore from backup
backup restore [backup-filename]

# Clean old backups
backup cleanup

Help and Documentation

# Show help
help

# Generate README
README 작성해줘

Example Workflows

1. Project Analysis Workflow

gemini
> 프로젝트 분석해줘
> src/app.js 분석해줘
> README 작성해줘

2. Code Modification Workflow

gemini
> src/utils.js 수정해줘 - 에러 핸들링 추가해줘
> backup list
> 수정 내용이 마음에 들지 않으면: backup restore utils.js.2024-01-15T10-30-00-000Z.backup

Features

🤖 AI Chat Interface

• Interactive chat session with Gemini AI
• Single query mode for one-off questions
• Bilingual support (Korean/English) with automatic language detection
• Multiple Gemini models (2.0-flash, 2.5-pro, 2.0-flash-lite, 2.5-flash)
• Real-time AI responses with loading animations

📊 Project Analysis

• Full project analysis: Scans entire project directory structure
• Individual file analysis: Analyzes specific code files
• Excludes common directories (node_modules, .git, backup, dist, build)
• Supports multiple file types (.js, .ts, .jsx, .tsx, .json, .md, .py, .java, .c, .cpp, etc.)
• Provides detailed insights about code structure and architecture

✏️ Code Modification

• AI-powered code modification based on natural language requests
• Smart file path resolution (handles both absolute and relative paths)
• File extension auto-detection
• Context-aware modifications using project analysis

🛡️ Security Features

• Path traversal attack prevention
• File extension validation
• File size limits (10MB max)
• Input sanitization and validation
• Secure API key storage

💾 Advanced Backup System

• Automatic backup: Creates timestamped backups before modifications
• Backup management: View, restore, and cleanup backup files
• Restore functionality: Restore from any backup with safety checks
• Cleanup tools: Remove old backups automatically (30-day retention)

🎯 Command System

• Help system: Built-in help and command discovery
• Backup commands:
  • backup list - View all backup files
  • backup restore [filename] - Restore from backup
  • backup cleanup - Clean old backups
• Analysis commands: Project and file analysis
• Modification commands: Natural language code editing

🌐 Intelligent Web Search

• Automatic web search detection based on query intent
• Multi-step research with reflection and follow-up queries
• Source attribution with reliable reference links
• Optimized for both real-time information and technical queries

⚙️ Customizable Settings

• Model selection: Choose from multiple Gemini models
• Language preference: Switch between Korean and English
• Persistent configuration stored locally
• Easy settings management via CLI commands

🔧 Developer Experience

• Support for both Windows and macOS
• Smart error handling with helpful suggestions
• Progress indicators and status messages
• Automatic file extension detection
• Similar filename suggestions when files not found

Requirements

• Node.js version 20 or higher
• A Gemini API key from Google AI Studio

Notes

• Your API key is stored locally in a .env file
• The key is never shared or transmitted to any external services
• The tool works offline once the API key is configured

Changelog

v1.4.0 (2025-06-23)

🎯 Major Bug Fixes & Language Improvements

• Fixed Language Switching Issues

  • Issue: English language setting wasn't working properly - AI responses and UI messages were still in Korean
  • Solution: Complete overhaul of language detection system
  • Impact: Now when you set set language en, everything responds in English including:
    • AI chat responses
    • Web search results and status messages
    • All UI text and system messages

• Improved Multiline Input System

  • Issue: Character duplication and display problems after first input
  • Solution: Rewrote multiline input handler to fix terminal state conflicts
  • Features:
    • Stable backslash (\) continuation method
    • Clean terminal display with proper cleanup
    • No more duplicate characters or overlapping text

• Streamlined Text Formatting

  • Change: Removed complex markdown libraries that were causing rendering issues
  • Implementation: Simple text formatter with chalk styling
  • Benefits:
    • Faster loading and better compatibility
    • Clean text output with proper alignment
    • Basic styling (bold, italic, headers) without markup artifacts
    • Consistent formatting across all responses

🔧 Technical Improvements

• Language System Overhaul: Dynamic prompt generation based on current language setting
• Internationalization: All hardcoded text now uses i18n system
• Dependency Optimization: Removed marked and marked-terminal for lighter package
• Input Stability: Fixed readline interface conflicts and terminal state management

💡 Usage Changes

# Language switching now works properly
> set language en
Language changed to: English
> hello
Response: Hi there! How can I help you today?

# Multiline input with backslash
> This is a long question \
... that continues on the next line \
... and finishes here

# Clean text formatting without markdown artifacts

v1.3.0 (2025-06-23)

🚀 Major New Features

• Intelligent Web Search Integration

  • Automatic intent detection: AI automatically determines when web search is needed
  • Multi-step research: Generates multiple search queries and performs follow-up searches
  • Source attribution: Provides reliable references with clean formatting
  • Optimized performance: Reduced token costs with efficient English prompts

• Bilingual Support System

  • Language switching: set language ko|en to switch between Korean and English
  • Localized help: Dynamic help text based on selected language
  • Persistent settings: Language preference saved across sessions

• Multiple Gemini Model Support

  • Model selection: Choose from gemini-2.0-flash, gemini-2.5-pro, gemini-2.0-flash-lite, gemini-2.5-flash
  • Easy switching: set model [model-name] command
  • Model information: models command to view all available models with descriptions
  • Unified configuration: Model settings apply to both chat and web search

⚙️ Settings Management

• New commands:
  • settings - View current configuration
  • models - List all available Gemini models with descriptions
  • set model [model] - Change Gemini model
  • set language [ko|en] - Change interface language
• Persistent storage: Settings saved in config.json
• Smart defaults: Fallback to sensible defaults if config missing

🎨 Improved User Experience

• Enhanced search results: Beautiful formatted output with bordered sections
• Reduced verbosity: Cleaner progress indicators and status messages
• Better error handling: More informative error messages in user's preferred language
• Optimized performance: 50% reduction in API calls through simplified reflection logic

🔧 Technical Improvements

• Token optimization: English prompts reduce costs by 80%
• Modular architecture: Separated settings, i18n, and configuration management
• Type safety: Better error handling and validation
• Future-ready: Extensible framework for additional languages and models

v1.2.1 (2025-06-19)

🐛 Bug Fixes

• Fixed backup file path structure issue
  • Problem: Backup files were ignoring the original file's path structure and being stored in the root backup folder
  • Solution: Modified backup creation to maintain the original file's directory structure within the backup folder
  • Example:
    • Before: src/app.js → backup/app.js.timestamp.backup
    • After: src/app.js → backup/src/app.js.timestamp.backup
• Fixed root directory configuration issue
  • Problem: Backup files were being created in the Gemini CLI project root instead of the execution location
  • Solution: Changed rootDir to current working directory (process.cwd()) to create backups in the execution location
  • Example:
    • Before: vocatrain-v2-FE/src/app.js → gemini-cli/backup/...
    • After: vocatrain-v2-FE/src/app.js → vocatrain-v2-FE/backup/...

🚀 New Features

• Added tree command for project structure visualization

  • Feature: Visualize project directory structure in tree format
  • Usage: Use tree command to view current project's file/folder structure
  • Benefits: Easy identification of exact file paths for modifications
  • Features:
    • Color-coded directories and files
    • File extension-based color coding (JS/TS: yellow, JSON/MD: green, CSS: magenta, etc.)
    • Smart filtering (excludes node_modules, .git, backup, etc.)
    • Alphabetical sorting (directories first)

• Enhanced README generation with project analysis

  • Feature: Automatically generate customized README based on project structure analysis
  • Improvement: Creates new files with date stamps instead of overwriting existing README
  • Analysis: Provides project structure and package.json information to AI for accurate README generation
  • Output: Generates files in README-2024-01-15.md format

🔧 Backup System Improvements

• Enhanced backup list display

  • Backup file listing now searches only within backup folder (removed full project search)
  • Added original file path location information for backup files
  • Clearer backup path display (backup/src/app.js.timestamp.backup)

• Improved backup cleanup functionality

  • Change: backup cleanup command now deletes all files within backup folder
  • Before: Deleted only backups older than 30 days (selective deletion)
  • After: Complete deletion of all files within backup folder
  • Safety: Recursive deletion ensures all subdirectories are cleaned

• Improved backup management

  • listBackups() function now properly handles nested backup directory structures
  • Enhanced path matching for backup restoration
  • Improved backup completion messages (relative path display)

📚 Documentation Updates

• Updated help command
  • Added tree command
  • Improved command categorization (Analysis, Modification, Documentation, Backup Management, Other)
  • Clearer command descriptions

🎯 User Experience Improvements

• Better file path handling

  • Backup creation based on execution directory
  • Independent backup management per project
  • Intuitive file path display

• Enhanced project analysis

  • README generation based on actual project structure analysis
  • Accurate technology stack information using package.json data

v1.1.8 (2025-06-19)

🚀 Major Architecture Improvements

• Service Layer Refactoring
  • Created ChatService for centralized AI communication
  • Separated UI utilities (src/utils/ui.js) for better code organization
  • Moved formatting logic to dedicated utility (src/utils/formatting.js)
  • Eliminated duplicate code across CLI and service modules

🛡️ Security Enhancements

• Added comprehensive security validation (src/utils/security.js):
  • Path traversal attack prevention with validateAndNormalizePath()
  • File extension whitelist validation
  • File size limits (10MB maximum)
  • Input sanitization to prevent malicious input
• Enhanced file access controls across all services

💾 Advanced Backup System

• Complete backup management system:
  • listBackups() - View all backup files with metadata
  • restoreFromBackup() - Restore files with pre-restore safety backup
  • cleanupBackups() - Automatic cleanup of old backups (30-day retention)
• Smart backup features:
  • Timestamped backup files
  • Backup rotation and size management
  • Restore history tracking

🎯 Enhanced Command System

• Built-in help system with comprehensive command documentation
• Extended backup commands:
  • backup list - Show all available backups
  • backup restore [filename] - Restore from specific backup
  • backup cleanup - Clean old backup files
• Improved command parsing with better error handling

🔧 Developer Experience

• Dependencies Management: Added missing packages (chalk, express, cors)
• Error Handling: Centralized error display with user-friendly messages
• Code Quality: Removed duplicate logic and improved maintainability
• Performance: Optimized file operations and memory usage

🏗️ Breaking Changes

• Refactored CLI entry point for better modularity
• Service interfaces standardized across all modules
• Enhanced security may block previously accessible files outside project directory

v1.1.7 (2025-06-19)

• Code Quality and Structure Improvements
  • Refactored core modules for better maintainability
  • Enhanced error handling across all service layers
  • Updated file processing logic and path resolution
  • Improved code organization and modularity
• Configuration Updates
  • Updated package.json dependencies and metadata
  • Enhanced build scripts and setup procedures
  • Improved .gitignore configuration
• Bug Fixes and Optimizations
  • Fixed various edge cases in file operations
  • Enhanced backup system reliability
  • Improved CLI command handling and response formatting

v1.1.6 (2025-06-18)

• Backup Path Storage Enhancement
  • Added configurable backup directory path variable
  • Users can now customize backup file storage location
  • Improved backup file organization and management
  • Enhanced backup path validation and error handling

v1.1.4 (2025-06-18)

• Major Error Handling Improvements
  • Enhanced try-catch blocks across all functions
  • Added specific error messages for network and API key issues
  • User-friendly error guidance with recovery suggestions
• File Path Processing Enhancements
  • Automatic absolute/relative path resolution
  • Smart file extension detection (.js, .ts, .jsx, etc.)
  • Similar filename suggestions when file not found
  • Pre-validation of file existence
• API Response Stability
  • Robust JSON parsing with fallback mechanisms
  • Code block extraction for malformed responses
  • Response structure validation
• User Experience Improvements
  • Progress indicators and status messages
  • Automatic backup file generation with timestamps
  • Clear success/failure feedback
  • Graceful error recovery without program termination

v1.1.3 (2025-06-17)

• Project Analysis Improvements
  • Fixed duplicate output issue in analysis results
  • Enhanced file path recognition
  • Improved analysis result formatting
• Code Modification Enhancements
  • Added common file modification request mappings
  • Improved file path resolution logic
• Code Structure Improvements
  • Modular separation by functionality
  • Enhanced error handling
  • Improved code readability

v1.0.28 (2025-06-17)

• Initial Release
  • Basic CLI functionality
  • Gemini AI integration
  • Project analysis feature
  • Code modification feature

License

MIT