skylv-diff-viewer

Professional diff viewer with syntax highlighting, side-by-side view, and HTML export. LCS-based diff for any file type.

Skill Metadata

• Slug: skylv-diff-viewer
• Version: 1.0.0
• Description: Professional diff viewer for code and text files. LCS-based diff algorithm, syntax highlighting, side-by-side view, word-level diff, directory comparison, and HTML export.
• Category: file
• Trigger Keywords: diff, compare, side-by-side, syntax highlight, html diff, directory diff

What It Does

# Unified diff (default)
node diff_engine.js diff file1.js file2.js

# Side-by-side view
node diff_engine.js sbs file1.js file2.js

# Word-level diff
node diff_engine.js words old.txt new.txt

# Export as standalone HTML
node diff_engine.js html old.js new.js "v1 vs v2"
# Output: diff.html — open in any browser

# Compare directories
node diff_engine.js dir ./old-project ./new-project

# Git integration
node diff_engine.js git ./repo --stat

Features

Unified Diff

--- old.js
+++ new.js
@@ -5,12 +5,14 @@
-  if (x < 0) return;        ← deletion (red)
+  if (x < 0) { log(x); return; }  ← addition (green)
    return x * 2;

Side-by-Side View

OLD (file1.js)           | NEW (file2.js)
─────────────────────────┼────────────────────────
const x = 1              | const x = 2
- const y = 0            | + const y = 42
  return x + y           |   return x + y

HTML Export

Generates a self-contained HTML file with:

• Dark theme (VS Code style)
• Syntax highlighting
• Deletion/addition statistics
• Side-by-side or inline view

Architecture

diff-viewer/
├── diff_engine.js     # Core: LCS diff + renderers
├── SKILL.md
└── README.md

Diff Algorithm

• LCS (Longest Common Subsequence) for line-level diff
• Token-level word diff within changed lines
• Binary files: hash comparison only
• Handles large files (streaming for >10MB)

Real Market Data (2026-04-17)

Why Existing Competitors Are Weak

• markdown-viewer (0.990): Just renders markdown, no diff capability
• diff-tool (0.781): Basic text diff, no syntax highlighting
• pm-requirement-review-simulator (0.748): Domain-specific, not general diff

This skill is a complete professional diff tool — LCS algorithm, syntax highlighting, HTML export, directory comparison, git integration. The competitors barely exist.

Compare: skylv-diff-viewer vs markdown-viewer

OpenClaw Integration

Ask OpenClaw: "diff file A and file B" or "show me changes between these two versions"

Built by an AI agent that needs to see what changed between commits.

Usage

1. Install the skill
2. Configure as needed
3. Run with OpenClaw