Ask HN: What are some tools / libraries you built yourself?

sqldb-logger: https://github.com/simukti/sqldb-logger

It's a thin layer that wrap Go (Golang) SQL database driver, it does not change sql.DB usage in any existing Go app.

It is because I prefer to use vanilla Go sql.DB in my web service and I could not find any SQL logger for Go SQL database standard library that can use structured JSON logging.

Thank you :)

Night Patrol - https://github.com/jahed/night-patrol

I got tired of passing flags to Nightwatch to filter tests and looking through results to re-run failures. So I made an interactive CLI for all of that. I stopped using this once I moved to Cypress but even with Cypress' web interface, I feel something like Night Patrol would be a lot more productive.

Firebase Rules - https://github.com/jahed/firebase-rules

I didn't like how Firebase's RTDB rules were expressions in JSON strings so I built a library to build them using a lisp-like syntax to compose and re-use rules. Firebase also has its own rules language (Bolt) but I'd rather not learn and maintain yet another tool-specific language.

Promises - https://github.com/jahed/promises

This isn't a complete solution yet, I didn't get time to refine the API. But I really prefer using Promises as result types (a.k.a. either, left/right) rather than using async/await/try/catch. It's so much more powerful to write code in a way that doesn't care if your functions are async or sync. Again, kind of like a lisp, there's also power in not being tied to a language's keywords and being able to provide a more tailored vocabulary.

I'm building a turn-based strategy game for iOS (in Swift).

Just extracted the Monte Carlo Search Tree logic into a package called Carlo [1]!

[1] https://github.com/maxhumber/Carlo

I needed to process some large JSON files on a 32bit machine, and kept blowing the RAM. I found it easier to process the data as msgpack, since msgpack specifies field lengths in advance, whilst JSON requires scanning through the contents to find matching delimiters. I couldn't find a conversion tool which didn't also run out of RAM (presumably due to buffering until it found a delimiter); so I wrote my own bare-bones converter (which assumes well-formed input and doesn't even support numbers): http://chriswarbo.net/git/json-to-msgpack

For another project I was getting static HTML reports from a tool, which contained third-party styles and scripts that didn't work when the reports were accessed from 'file://' URLs. I asked on StackOverflow ( https://stackoverflow.com/questions/50339325/inlining-extern... ) but all the suggestions involved a Web browser or complex Javascript build tools. I ended up writing a little Python script to replace such third-party content with data-URI versions: http://chriswarbo.net/git/html-inliner

Many years ago I wanted to control some physical sensors/actuators using an Arduino, controlled via a complicated C++ project running on my desktop. I wrote a simple sketch for the Arduino which just reads/writes 'commands' over a USB cable, in a simple JSON format http://chriswarbo.net/projects/arduino (I then wrote a trivial Python script to shuttle messages back/forth between the USB line and the C++ program)

I like reading RSS/Atom feeds in Emacs, but my preferred reader only supports maildir. There are a few projects which can convert between these, but they all include 'databases', URL fetching, etc. which I didn't need. Hence I took one of these and ripped out all of the functionality I didn't need http://chriswarbo.net/blog/2017-01-14-rss_to_maildir.html

I've come up with a few scripts and Emacs macros for extracting metadata from PDF files http://chriswarbo.net/projects/pdf-tools.html