Coding

Swift code syntax highlighting in WordPress

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ContentsBaseline: XcodeCommon limitation: no Light/Dark mode supportThe contestantsCode Block ProPerformanceProsConsCodeColorerPerformanceCode Syntax BlockPerformanceProsConsEnlighterPerformanceProsConsHighlighting Code BlockPerformanceProsConsPrismaticSyntax-highlighting Code Block (with Server-side Rendering)PerformanceProsConsSyntaxHighlighter EvolvedPerformanceProsConsUrvanov Syntax HighlighterPerformanceProsConsThe winnerWhat are other websites using? The built-in “code” block for WordPress (the CMS I use for this site) is virtually useless – it’s just a <pre> block, essentially. The appearance may vary depending… Read more

SwiftData pitfalls

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I’ve been exploring SwiftData lately, and I’ve been unpleasantly surprised by how many sharp edges it has. I’m going to try to describe some of them here, so that hopefully others can avoid them (or perhaps be dissuaded from using SwiftData to begin with). I’m using Xcode 15.0.1 (Swift 5.9) on macOS 14.1 (Sonoma). Background… Read more

Collection enumeration performance in Swift

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Swift’s Collection and Sequence protocols provide two primary ways to enumerate (filter, map, reduce, etc): functional-style and imperatively. For example: Or: Nominally these are equivalent – they’ll produce the same results for all correctly-implemented Collections and Sequences. So in principle which you use is purely a matter of stylistic preference. But is it? Do they… Read more

Zsh has neat shortcuts for decomposing file names & paths

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I only just learned that the venerable basename and dirname are no longer necessary, let-alone the horrible string splitting required for teasing apart names from file extensions. Zsh has some awesomely convenient expansion modifiers which do it all! e.g. given the path “/Users/me/Documents/Work.zip”: $file:t → Work.zip $file:h → /Users/me/Documents $file:r → /Users/me/Documents/Work $file:e → zip… Read more

getifaddrs never specifies broadcast addresses

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Apple “Feedback” #12149764. According to man 3 getifaddrs: The ifa_dstaddr field references the destination address on a P2P interface, if one exists, otherwise it contains the broadcast address. In my testing the ifa_dstaddr field is never non-null. I’m not sure I have any suitably configured P2P interfaces, but I definitely have interfaces with broadcast capabilities… Read more

getifaddrs returns truncated sockaddr_in’s for AF_INET ifa_netmasks

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Apple “Feedback” #12149675. Some netmasks returned by getifaddrs have family of AF_INET yet a length less than sizeof(sockaddr_in), e.g. 5, 6, 7, or 8. On macOS Ventura 13.3.1, at least. It looks like it’s actually allocating only eight bytes for the ifa_netmask (not the 16 that is the size of sockaddr_in per MacOSX13.3.sdk/usr/include/netinet/in.h), as it… Read more

Performing a delayed and/or repeating operation in a Swift Actor

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Say you want to perform some operation after a delay, and/or at regular intervals, inside a Swift actor – maybe your actor represents a weather station and you want to periodically fetch the latest weather information, automatically. How do you do that? You could punt the problem to some other code, outside the actor –… Read more