Tilt is a local development orchestration tool for Kubernetes and Docker Compose microservice environments. The Go binary evaluates a Starlark-based Tiltfile, watches the filesystem, builds container images, applies changes to a cluster or docker-compose stack, streams logs, and presents state through both a terminal HUD and a React web UI. The architecture is a single CLI/daemon combining a controller-runtime-style apiserver with custom v1alpha1 resource types, a Redux-like central store with actions and reducers, engine subscribers that react to state changes, and reconcilers per resource type. Key entry points are cmd/tilt/main.go, internal/cli/* for command handling, internal/engine/upper.go for the main event loop, and internal/controllers/core/* for reconciliation. External dependencies include Docker daemons/buildx, Kubernetes API servers, docker-compose, git, and optional Tilt Cloud analytics/telemetry endpoints. The codebase is exceptionally large and well-tested, though it carries visible dual-paradigm debt: older store/engine patterns coexist with newer apiserver/controller patterns, and many feature flags are marked obsolete.
Air is a command-line live-reload utility for Go application development. It watches a project directory for file changes, automatically rebuilds the project using a configurable build command, and restarts the resulting binary. The tool includes an embedded HTTP reverse proxy that injects a JavaScript snippet into HTML responses, enabling automatic browser reload via Server-Sent Events after each successful rebuild. It supports custom build commands, pre/post hooks, environment file loading, platform-specific build overrides, and watch rules that run commands instead of triggering a full rebuild (e.g., for frontend asset pipelines or code generation). The architecture is a single Go binary with a main event loop that uses filesystem notifications (or polling) to detect changes, spawns build processes, and manages child process lifecycle. The codebase is well-structured with clear separation of concerns: configuration parsing (runner/config.go), engine orchestration (runner/engine.go), file watching (runner/watcher.go), HTTP proxy (runner/proxy.go), and platform-specific process management (runner/util_*.go). It includes a comprehensive test suite and CI pipelines for Linux, macOS, and Windows. The proxy component, in particular, demonstrates sophisticated handling of content encoding (gzip, brotli), streaming responses (SSE, chunked transfer), and hop-by-hop header management, making it a reusable pattern for adding live-reload capabilities to any Go web application.
Reload is a Node.js library and CLI tool that automatically refreshes web pages in the browser when server-side code changes. It works by injecting a client-side JavaScript file that opens a WebSocket connection to the server. When the server restarts (or a manual reload event is triggered), the WebSocket closes, the client detects the closure, waits for the server to come back up, and then reloads the page. The library integrates with Express applications by creating a route to serve the client script, while the CLI tool serves static files and uses nodemon to watch for file changes. The core logic is in `lib/reload.js`, which handles WebSocket server setup, HTTPS support, and parameter validation. The client-side script (`lib/reload-client.js`) is a self-contained pattern that can be reused in other projects. The codebase is well-tested, actively maintained, and follows modern JavaScript practices.
Spiel is a terminal-based framework for creating and presenting slide decks using Python. It enables users to define slides as functions that return renderable objects (via Rich), and presents them in a navigable terminal user interface built with Textual. The framework supports features like live reloading during development, slide transitions, and dynamic content generation through a trigger system. The architecture centers around a `Deck` class that manages a sequence of `Slide` objects. Each slide's content is defined by a function that can optionally receive a `Triggers` object for time-based or interactive effects. The presentation is driven by a custom Textual application (`SpielApp`) that handles user input, screen transitions (including slide-to-slide animations), and automatic reloading of the deck when source files change. Key components include the CLI for launching presentations, a flexible slide definition system, and reusable widgets for rendering content such as syntax-highlighted code and images. Notable reusable components include the `Triggers` class for managing interactive state, the `Swipe` transition for slide animations, the `Image` widget for terminal image display, and a set of utility functions (`clamp`, `filter_join`, `chunks`) that solve common programming problems. These components are designed with low coupling and could be extracted for use in other projects with minimal modification.