Tools

reptyr: Move a Running Process Into tmux After Forgetting to Start It

reptyr uses ptrace to re-attach a running process to a new terminal. Started a long job over SSH without tmux? reptyr moves the process into tmux so you can disconnect safely.

Database

Two SQL NULL Traps: Missing JOIN Rows and UNIQUE Constraints That Do Nothing

NULL behavior varies across databases and causes two common problems: JOIN on NULL columns returns no rows, and UNIQUE constraints allow multiple NULLs. Covers MySQL, PostgreSQL, SQLite, SQL Server with solutions for each.

Frontend

ky + p-limit: Concurrency Control With Built-in Retry for Batch Requests

ky handles per-request retry, timeout, and auth hooks. p-limit caps simultaneous requests. Two tools, two responsibilities — batch-fetching 100 endpoints without hitting 429 or losing data to network hiccups.

Frontend

Fetch Concurrency Control: Limit Simultaneous Requests with p-limit

Promise.all with 100 requests fires them all at once — servers respond with 429 or fall over. Use p-limit with fetch to cap the number of simultaneous requests. One line of setup, no custom semaphore required.

Python Tools

auto-venv: Fish Shell Auto-Activates Python Virtualenvs on cd

auto-venv is a Fish shell plugin that automatically activates and deactivates Python venvs on directory change. Supports .venv, venv, .env, env naming, uses git root for scope, and works with z, zoxide, and any other navigation tool.

PHP Tools

Fish Shell + Laravel Valet: Auto-Switch PHP Versions and Composer v1/v2

Use fish shell aliases and functions to make php, composer, and phpunit automatically follow Laravel Valet PHP versions. Handles legacy projects requiring Composer v1 with smart composer.phar detection.

Python Testing

Python Mock Pitfall: Patch Where It Is Used, Not Where It Is Defined

The most common Python mock mistake: patching utils.sum when the test still runs the real function. When you do `from utils import sum`, the importing module gets its own binding. Patch the importing module's namespace, not the original definition.

PHP

PHP goto Isn't Evil: One Less Nesting Level for Retry Logic

PHP goto makes retry logic more readable than while loops: one less nesting level, flatter structure, clearer intent. Only jumps back when explicitly retrying — success returns directly, exhausted retries throw.

Laravel PHP

Generate Root Domain URLs Inside Laravel Subdomain Routes: clone UrlGenerator

Inside a Laravel subdomain route, url() and route() produce URLs with the subdomain. Clone app(UrlGenerator::class) and call useOrigin() to generate root domain URLs without affecting global state.

AI

CLI-Anything: The Universal Bridge for AI Agents to Control Any Software

No screenshots, no clicking — one command makes Claude Code generate a complete CLI for any software, letting AI agents directly call GIMP, Blender, and LibreOffice