Last week I announced the release of a new version of PreviewMarkdown that will preview YAML front matter in Markdown files. Work on that release prompted me to code a new app that enables QuickLook previews and Finder icon thumbnails of YAML files.
I have a quite few YAML files that configure a number of projects, mostly websites built using the Hugo static-site generator, and it’s really handy to be able to select one in Finder and quickly view its contents just by hitting space. Thumbnails are nice to see too, but for me it’s the QuickLook preview functionality that I most value because it saves me a heck of lot of time opening files in an editor just to read a line or two — or even just see if this is the file I’m looking for.
PreviewYaml works just like PreviewMarkdown: it’s a host app that makes preview preferences accessible and a pair of app extensions that are called by Finder when you ask for a preview, or open a window containing one or more .yaml files. If you try it yourself, you need to run the app to register the extensions with macOS, and to apply any particular settings you want, such as preview font and size, the colour of keys so they stand out from their values, how much indentation you prefer, and whether bad YAML is displayed in the preview its raw form or ignored.
You can also use the main app to submit feedback and bug reports, and you can check out the app’s known issues. These are under investigation, but I think will only affect a very, very small number of users. But please let me know if I’m wrong in that assumption!
A couple of macOS releases or so ago, Apple introduced app extensions: self-contained modules that are bundled within apps to deliver functionality to the wider operating system. But how do apps and their extensions share information between themselves, in particular users’ preferences?
PreviewMarkdown, my modern QuickLook plug-in for Markdown files, was recently updated to version 1.1.4. It was a minor change, which is why it wasn’t announced here, but the reason for the update may interest to anyone keen to understand the workings of macOS. It also highlights some inconsiderate behaviour on the part of some Mac software developers.
imageprep, my command line tool for batch-processing picture files, had a big update a week or so back — and now it has another one. With the second update imminent, I didn’t announce the first, 6.1.0, which I released to coincide with my post on writing command line utilities in Swift. That done, it’s time to shout about imageprep 6.2.0.
I’ve just released version 6.0.0 of imageprep, my macOS command line tool for processing batches of images. Born a shell script, imageprep has now not only finished school and graduated from college, but also has gained employment as a fully compiled application. It’s written in Swift so it’s quicker these days.
Another day, another update. This time it’s PreviewMarkdown, my macOS utility for providing QuickLook file previews and icon thumbnails in Finder. It runs under Catalina and above, and this version makes some adjustments to support Big Sur.
You can read more about using PreviewMarkdown — just run it once to register its app extensions, and that’s it — it the product page here. You can download PreviewMarkdown from the Mac App Store.