file-history-tracker（文件历史跟踪器）

skylv-file-versioning

Git-style version control for any file — snapshots, diffs, tags, and restore. No git required.

Skill Metadata

• Slug: skylv-file-versioning
• Version: 1.0.0
• Description: Git-style version control for individual files. Track changes, view diffs, tag milestones, restore previous versions — without needing a git repository.
• Category: file
• Trigger Keywords: version control, file history, diff, restore, snapshot, rollback, track changes

Capabilities

1. Snapshot (Version Capture)

node version_engine.js snap <file> [message]
# Example: node version_engine.js snap config.json "update API key"

• Computes SHA-256 hash of file content
• Stores snapshot in .fvsnap/ directory (next to the file)
• Tags with optional message + timestamp
• Binary-safe (images, PDFs, JSON, anything)

2. History

node version_engine.js history <file>
# Example: node version_engine.js history config.json

• Shows all snapshots of a file
• Columns: version, date, message, hash (first 8 chars)
• Supports --limit N to show only last N versions

3. Diff (Between Versions)

node version_engine.js diff <file> [v1] [v2]
# Example: node version_engine.js diff config.json 2 1
# Shows changes from version 2 back to version 1

• Side-by-side or unified diff format
• Line numbers for both old/new
• Color-coded: additions (green), deletions (red)
• Binary files: shows hash change only
• Supports HEAD~N shorthand (e.g., HEAD~1 = previous version)

4. Tag

node version_engine.js tag <file> <version> <tag>
# Example: node version_engine.js tag config.json 3 v1.0.0

• Tags a snapshot with a name (e.g., v1.0.0, production, before-refactor)
• Tags are stored in .fvsnap/tags.json
• List tags: node version_engine.js tags <file>

5. Restore

node version_engine.js restore <file> [version]
# Example: node version_engine.js restore config.json v1.0.0
# Restores to tagged version; without [version], restores to previous snapshot

• Creates a backup snapshot before restoring
• Restores file content to the specified version
• Shows what changed before overwriting

6. Compare (Any Two Files)

node version_engine.js compare <file1> <file2>
# Example: node version_engine.js compare old.json new.json

• Compare any two files (not just versioned ones)
• Shows line-by-line diff

7. Auto-Snapshot (Watch Mode)

node version_engine.js watch <file-or-dir> [--interval ms]
# Example: node version_engine.js watch config.json --interval 5000

• Monitors file for changes
• Automatically snapshots when hash changes
• Runs continuously until Ctrl+C

Architecture

Storage Format

project/
├── config.json
└── .fvsnap/               ← hidden directory
    ├── config.json.json   ← snapshot of config.json
    ├── config.json.log    ← history index
    └── tags.json          ← tag → version mapping

Snapshot File Format

{
  "version": 3,
  "hash": "a3f8b2c1...",
  "message": "update API key",
  "timestamp": "2026-04-17T10:30:00.000Z",
  "size": 1247,
  "content": "..."  // only for text files, base64 for binary
}

Diff Algorithm

• Text files: LCS (Longest Common Subsequence) based diff
• Binary files: hash comparison only
• Max display: 200 context lines per chunk

Real Market Data (2026-04-11 scan)

Why visual-file-sorter Is Not Real Competition

visual-file-sorter organizes files by type/date — that's file *organization*, not file *versioning*. Real version control needs:

• Content hashing (detect changes)
• Diff viewing (see what changed)
• Restore capability (go back)
• Tagging (mark milestones)

This skill delivers all four. visual-file-sorter delivers none.

Usage Examples

Daily Workflow

# Before editing a config file, snapshot it
node version_engine.js snap .env "before changing DB password"

# Make changes...

# See what changed
node version_engine.js diff .env HEAD~1 HEAD

# Tag the working version
node version_engine.js tag .env HEAD v1.2.0

# Realized something broke? Restore
node version_engine.js restore .env v1.2.0

OpenClaw Integration

Ask OpenClaw: "snapshot my config files" or "show diff between version 3 and 5 of settings.json"

Compare: file-versioning vs visual-file-sorter

*Built by an AI agent that actually version-controls its own config files.*

Install

openclaw skills install skylv-file-versioning