Add EternalHist Plugin - Advanced Persistent Command History with Multi-Remote Sync

Standards checklist:

• The PR title is descriptive.
• The PR doesn't replicate another PR which is already open.
• I have read the contribution guide and followed all the instructions.
• The code follows the code style guide detailed in the wiki.
• The code is mine or it's from somewhere with an MIT-compatible license.
• The code is efficient, to the best of my ability, and does not waste computer resources.
• The code is stable and I have tested it myself, to the best of my abilities.
• If the code introduces new aliases, I provide a valid use case for all plugin users down below.

Changes:

New Plugin: EternalHist

• Location: plugins/eternalhist/
• Files Added:
  • eternalhist.plugin.zsh - Main plugin implementation
  • README.md - Comprehensive documentation

Core Features

• Persistent command history across shell sessions and system reboots
• Multi-remote synchronization support for cloud storage (Dropbox, Google Drive, S3, SSH servers)
• Advanced search capabilities with regex support and multi-term filtering
• Default search behavior - eternalhist <terms> searches without requiring explicit search command
• Escape mechanism - Use \command to search for command names that conflict with plugin commands
• Backward compatibility - Provides ht() function for existing workflows

Commands Provided

• eternalhist [search_terms...] - Search eternal history (default behavior)
• eternalhist add [command] - Add command to eternal history
• eternalhist show [limit] - Display recent eternal history
• eternalhist stats - Show usage statistics
• eternalhist sync [remote...] - Synchronize with configured remotes
• eternalhist remotes list/test - Manage remote configurations
• eternalhist config - Show current configuration
• eternalhist clear - Clear all eternal history (with confirmation)
• ht [search_terms...] - Backward compatibility alias

Environment Variable Configuration

• Multi-remote support: ETERNALHIST_REMOTES="primary,backup"
• Per-remote settings: ETERNALHIST_<REMOTE>_PROVIDER, ETERNALHIST_<REMOTE>_PATH, etc.
• Sync strategies: Configurable sync behavior, timeouts, and conflict resolution
• Security options: Encryption support and privacy filters

Provider Support

• SSH/SCP: Full implementation for remote server sync
• Cloud providers: Framework ready for Dropbox, Google Drive, S3 (placeholder implementations)
• Extensible design: Easy to add new storage providers

Use Cases:

For Individual Users

• Cross-session history: Never lose important commands between terminal sessions
• Multi-device sync: Keep command history synchronized across laptops, servers, and workstations
• Advanced search: Find complex commands from weeks or months ago using flexible search patterns
• Backup and recovery: Automatic backup of command history to prevent data loss

For Teams and Organizations

• Shared knowledge base: Team members can sync and share useful command patterns
• DevOps workflows: Maintain persistent history of deployment and maintenance commands
• Audit trails: Keep comprehensive logs of executed commands with timestamps and directories
• Remote work: Synchronize command history between home and office environments

Specific Examples

# Find that complex docker command from last month
eternalhist docker run --mount

# Search for git commands with specific patterns
eternalhist git rebase interactive

# Sync command history to backup server
eternalhist sync backup

# Search for commands that conflict with plugin names
eternalhist \add user database  # Search for "add user" commands

# Get statistics on command usage
eternalhist stats

Other comments:

Design Philosophy

This plugin extends the concept of shell history beyond the limitations of built-in history mechanisms. While standard shell history is often limited by size, session boundaries, and single-machine scope, EternalHist provides unlimited, persistent, and distributed command history management.

Compatibility

• Zero breaking changes to existing oh-my-zsh functionality
• Optional activation - Only active when explicitly added to plugins list
• Graceful degradation - Works locally even without remote configuration
• Secure by default - All remote operations require explicit configuration

Performance Considerations

• Lazy loading - Remote sync operations are asynchronous and don't block shell startup
• Configurable limits - Search result limits prevent overwhelming output
• Efficient search - Uses standard Unix tools (grep, tail) for fast local searches
• Optional features - Auto-sync and auto-add can be disabled for minimal overhead

Future Extensibility

The plugin architecture supports easy addition of:

• New cloud storage providers
• Enhanced search algorithms (fuzzy matching, semantic search)
• Integration with external tools (fzf, ripgrep)
• Export formats for analysis and reporting
• Collaborative features for team environments

Security Notes

• Local file permissions set to 600 (user-only access)
• Configurable privacy filters to exclude sensitive commands
• Encryption support framework for sensitive environments
• No automatic data collection - all sync operations are explicit and user-controlled