Docsmith

Docsmith adds snapshot-based versioning, format-aware diffs, and inline comments to any ActiveRecord model — with zero system dependencies.

• Full content snapshots for HTML, Markdown, and JSON — instant rollback to any version
• Format-aware diffs — word-level diffs for Markdown; HTML tags treated as atomic tokens
• Inline and document-level comments with threading, resolution, and version migration
• Debounced auto-save with per-class and global configuration
• Lifecycle events — hook into version_created, version_restored, version_tagged
• Clean service API — works standalone without any model mixin

# Gemfile
gem "docsmith"

rails generate docsmith:install
rails db:migrate

class Article < ApplicationRecord
  include Docsmith::Versionable
  docsmith_config { content_field :body; content_type :markdown }
end

article.body = "New draft"
article.save!
article.save_version!(author: current_user, summary: "First draft")

result = article.diff_from(1)
result.additions   # word-level count for markdown
result.to_html     # <ins>/<del> markup

A self-contained Sinatra demo is in demo/. It shows versioning, diffs, and comments working end-to-end — no Rails required.

cd demo
bundle install
ruby app.rb
# open http://localhost:4567

See USAGE.md for full documentation including:

• Installation and migration
• Per-class and global configuration
• Saving, querying, and restoring versions
• Version tagging
• Format-aware diffs (Markdown and HTML parsers)
• Inline and document-level comments
• Events and hooks
• Standalone Document API
• Configuration reference

bin/setup
bundle exec rspec    # run tests
bin/console          # interactive console

Honest note: this gem was built over two weekends using Claude Code with the superpowers plugin. Not vibe-coding — the planning, architecture decisions, and implementation were all deliberate. If you're curious how it came together, the planning docs and implementation notes are in docs/superpowers.

Early designs got ambitious fast — branching, merging, conflict resolution. Turns out that's a lot of machinery for what is ultimately a document version manager. I stripped it back to what actually matters: snapshots, diffs, and comments. You can see all the planning in docs/superpowers.

MIT — see LICENSE.txt.