Check out the code listings in More Macintosh Toolbox (for instance) for a reminder of the role Pascal used to play in our world.

Pascal’s cool.

Craig on X 10.10

Craig thinks Helvetica Neue will be the next Mac system font, and suggests you start testing your apps with it now.

IAC on iOS

Check out GCDWebServer. (Via iOS Dev Weekly, which you should subscribe to.)

GCDWebServer is an embeddable and lightweight http server for Mac and iOS. On iOS it runs as a background task — it keeps running even when your app isn’t in the foreground.

Picture this: app X wants to send some data to app Y.

App Y is running GCDWebServer, so app X wraps up the data as JSON and talks to app Y via http. Just as if it were talking to some server on the web, only it’s a local app.

Quartz Composer + Snapping Scroll

Two tutorials from Dawid Woldu fascinate me. I keep wanting to make time to get into Quartz Composer.

The Science Behind Snapping Scroll – Part I: Dragging

The Science Behind Snapping Scroll – Part II: Animation & Logic

Quartz Composer isn’t included in Xcode these days, but you can still download it from Apple. (Find “Graphics Tools for Xcode.”)

Node + MongoDB + iOS

A two-part tutorial from Michael Katz is a good place to get started writing services. Node makes a great API server. And it’s fun.

How To Write A Simple Node.js/MongoDB Web Service for an iOS App

How to Write An iOS App that Uses a Node.js/MongoDB Web Service

The tutorials use MongoDB. I haven’t had a good reason for a NoSQL database myself lately — but my early career, back in the ’90s, was all about schema-less databases, and I have a major soft spot for them.

(I’m digressing now.)

Frontier’s database was a hierarchy of tables. Each table could contain anything, including other tables — including even your scripts.

To run a script named myScript inside the bar table which was inside the foo table, you’d write

If that script took a string as a parameter, say, you could use a local variable or reference any string anywhere in the database:, for example. This was all presented with a user interface, navigable and editable.

I haven’t seen a database like that anywhere else since then. So easy and intuitive. Great for productivity. (It was within this laboratory that such things as templated and scripted websites, blogs, RSS, OPML, and XML-RPC were invented and/or fleshed-out.)

Web, Money; App Store, No Money

Subvert: Why we chose to build our core software business on the open web instead of on a closed app store platform:

More so, unless you have huge sales volumes, it’s near impossible for a company selling $2.99 apps (our lowest cost product and a fee which, in the app store world, is considered wildly exorbitant) to make enough money to support their team, pay for office space, keep up to taxes, cover fees and look after all of the financial requirements that it takes to run a real business.

What is making money for them? A web app.

We’ve done next to zero promotion of this software-as-a-service (SaaS) product since we started building, using and supporting it two years ago. Instead, we’ve been slowly adding to the system, improving the platform and signing up paying customers on a regular basis. As a result, the product has been making money — real money — and long ago surpassed the combined revenues of our other commercial software applications in a big way.

I’m not sure that the choice is between web apps and app store apps — I think it’s actually about standalone apps versus apps-plus-services. But, still, read the post.

That’s No Button

Manton Reece explains how tint color is misused:

The problem is the implementation in apps that use tint color anytime they want to highlight something, whether it is tappable or not.

Skala Color

It’s free. I’ve spent a zillion hours with their app Skala Preview. Bjango does good work.

App Camp For Girls Pitch Sessions

There’s a video. Hearing that Jean MacDonald has gone full-time with App Camp made me glad.

Glassboard Board for The Record

The board is for questions, feedback, and Mac nerd nostalgia. Join with the invitation code APUME.

Vesper Sync Diary #14 - Keys

Here’s the initial design: the text of notes is encrypted in the database. The key is not stored in the source code. (The source code could get out and you wouldn’t be able to decrypt notes.)

That design is a no-brainer, and I thought I was finished at that point. But then I did a design review with some security folks, and they suggested I revise it like this:

The text of notes is encrypted in the database. They key is not stored in the source code. The key should change from time to time. To make this work:

  • Always encrypt using the latest key.

  • Add some token to the text that lets me know if it’s been successfully decrypted.

  • Try decrypting using the latest key first. If the token doesn’t appear in the right place, use the previous key. Repeat if necessary until decrypted.

  • Add a new key regularly. (Twice a year, for example.)

  • Be prepared with a script that re-encrypts all note text with the latest key, in case there are any security concerns at all.

This is sensible. I can’t think of any reason not to do it this way. Is there anything I’m missing?


Keith Harrison shows how to run custom Clang analyzer builds:

The open source build is updated frequently with bug fixes and extra checks. This makes it more likely to spot an error in your code that would go undetected with the Xcode bundled version.

Got @inessential

I went through Twitter’s impersonation process and was able to get the @inessential username.

The way it worked is that Twitter renamed @inessential_com, which I created a few days ago, to @inessential.

So if you followed @inessential_com, you’re now following @inessential, and there’s nothing you need to do.

Justin Refactors

Justin Williams: Refactoring in the Cloud:

Given that I’m not a fan of the C# threading model currently implemented, the amount of code used to power something that’s relatively simple, and the homegrown nature of many of the push wrappers we’re using, I made the decision to rewrite this portion of Glassboard’s architecture using Node.

Justin’s use of Azure is quite different from mine. Glassboard is more complex than Vesper syncing, which should be no surprise.

(If you think about it, you realize that Glassboard does syncing, but it’s silly to call it that because it’s a natural part of what’s expected of a group messaging app.)

Vesper’s architecture is smaller. There are two main components: an API server (Node.js Mobile Services app) and a reset-password site (Azure web site, also Node.js). There are no architecture-level refactorings for us to do at this point.

We’re at about 2,000 lines of server-side code. Small.

Premature Optimization and Servers

More than one person has suggested I’m guilty of violating the law of premature optimization when it comes to my server work.

Here’s the thing, though: when it comes to database schema, I really, really want to get it right before shipping.

Making code changes in a client app is normal. Making database schema changes in a client app is a pain, but not the worst thing.

Making code changes on the server is normal too, though a little hairy. But the hairiest of all is database schema changes on the server. I’m designing so that I don’t ever need to do that. (I may not reach that goal. Time will tell.)

Even though Brian Reischl wrote up how to do data migration, and so I have a good plan if I ever need to go there, I just don’t ever want to go there.

In other words: getting the server-side database schema right right now isn’t premature — it’s exactly the right time.

More on UUIDs and Clustered Indexes

My SQL Server genius pointed me to this article by Kimberly Tripp about the problem with GUIDs as primary and/or clustering key. (GUIDs and UUIDs are the same thing in this context. Microsoft folks often call them GUIDs.)

Another article suggests this isn’t a big deal with Azure SQL because a network write is slower than a page split anyway.

But the advice still seems to be that UUIDs don’t make the best clustering key. You want something narrow to keep down index size.

So I’ve slept on it. Do I still like this layout for the notes table?

id - auto-incrementing integer clustering primary key
noteID - UUID, unique
userID - int

Yes, I like it.

It’s the API?

Cesare Rocchi argues that the Heartbleed problem isn’t C — it’s the API.

My counter-argument: people make mistakes. People make dumb APIs. With C, combine a dumb API and a mistake and you get Heartbleed.

That’s far less likely with another language.

Here’s the thing: we will always have dumb ideas and mistakes. We can and should do our best to eliminate them, but we’ll never succeed entirely. Because we know that, we’re negligent if we don’t do our best to minimize their consequences.

Book Idea

Graham Lee notes that computing turns 100 probably within your lifetime and proposes a book about programming that I want.

Vesper Sync Diary #13 part 3 - Thinking Too Much

There are two pieces of advice I’ve been getting:

One is that I’m thinking too much about this. It’ll be fine if I have a properly normalized schema and I use the appropriate indexes. After that, don’t worry.

(I admit that I’m prone to going down every performance rabbit-hole I can find.)

The other — partly related — is that the right way to deal with the notes table is to do create a clustered primary key as userID + noteID. This way all notes by a given user will be together.

And this is the default behavior. It’s good. Smarter people than I am have thought about this.

And I can drop the integer identity column.

Update a few hours later: No. Wait. The best database guy I know tells me to do it the way I was thinking: surrogate key integer identity column as clustering key.

He also suggests I don’t need to add a unique constraint for noteID + userID, since noteID is a UUID. A unique constraint on noteID is all that’s needed.


I helped Ondřej with some of the wording on the home page for SettleApp.

Some advice for developers in general, off the top of my head:

  • Use words that humans use. (No “algorithms.”)

  • Use verbs. Verbs are vivid. Verbs trigger people’s imaginations — they picture themselves using the app.

  • Use curly quotes.

  • Don’t use comma splices.

  • Don’t talk about how you rewrote any part of your app. Nobody cares.

  • Don’t talk about how it’s native or about how it’s ready for the latest version of the OS. These things are assumed.

  • Don’t be repetitive.

  • Simplify.

  • Cut, cut, cut, cut, cut, cut.

  • Cut.