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Questionable puns aside, it’s Pride Month and we’re excited to celebrate by bringing you these updates hand-made by real LGBTQIA+ community members from around the world!—and possibly some straight cis folks too. This rainbow of releases includes some important accessibility updates, tons of bug fixes, and of course a few new features. Window Manager & Dock Another absolutely massive release of our window manager is out that fixes about 20 reported issues and a brand new Gesture Controller thanks to Leonhard and Leo. You can now Swipe up in Multitasking View to close windows, app titles in Multitasking View are now always shown—making them accessible for touch screen setups—and screenshots taken with a keyboard shortcut will send a notification that you can use to view it in Files, just to name a few headlining features. If you want to read the full release notes, Good Luck Babe they’re quite long. A new release of our Dock is also out which brings back a couple of old Plank features: showing multiple dots for apps with multiple running windows and cycling through app windows when you hold a drag-n-drop over its icon. Plus you can now open context menus with a long-press. And there’s a number of bug fixes including things related to hide modes and memory usage. Thanks again to Leo and Leonhard for their hard work here. System Settings Leonhard fixed a crash when setting custom hotcorner commands and we now only show the Applications Menu hotcorner action in its corresponding panel corner—that’s top-left for folks reading left-to-right and top-right for folks reading right-to-left. Plus there’s a new option to enable hotcorners even while an app is fullscreened. As a follow up to last month’s fixes, choosing light or dark mode in System Settings will now properly snooze your schedule instead of disabling it all together—a great convenience for those of us who suffer from eye strain or headaches and need to occasionally reach for that dark mode during the day. Plus, the Reduce Motion setting now covers a whole new range of animations—perfect for folks who get motion sick or find animations distracting. Leonardo tackled a couple of crashes in Display settings including one when mirroring, and another when new displays are attached while System Settings is open. We fixed an issue that prevented CalDAV accounts from connecting in Online Accounts settings. And Alain snuck in a few design tweaks, fixing button alignments etc. And More Thanks to feedback from Aaron, Notifications and the Shortcut Overlay both got releases that add screen reader support. Corentin addressed some Flatpak sandbox issues with an updated Apparmor Profile—especially notable if you’d had trouble with Steam. We now use BeaconDB as our location services provider. And thanks to Ryo we’re now shipping the latest version of GNOME Web which brings improved performance and web compatibility as well as a redesigned bookmarks sidebar. Get These Updates As always, pop open System Settings → System on elementary OS 8 and hit “Update All” to get these updates plus your regular security, bug fix, and translation updates. Or set up automatic updates and get a notification when updates are ready to install! Community Pride I want to take a little space to say that our community is for everyone regardless of gender or sexual identity. We’ve long been made up of lots of different kinds of folks and I’m really proud of that. Open Source software should never be a space that is restricted to a narrow set of identities. In a time where many companies are withdrawing their support for the LGBTQIA+ community, I think it’s incredibly important that we make a strong statement against hate and don’t give in to the pressure to erase queer people in some sad attempt to be “apolitical”. Free Software has always been political, and its politics are freedom and inclusivity and so are ours. Sponsors At the moment we’re at 23% of our monthly funding goal and 336 Sponsors on GitHub! Shoutouts to everyone helping us reach our goals here. Your monthly sponsorship funds development and makes sure we have the resources we need to give you the best version of elementary OS we can! Monthly release candidate builds and daily Early Access builds are available to GitHub Sponsors from any tier! Beware that Early Access builds are not considered stable and you will encounter fresh issues when you run them. We’d really appreciate reporting any problems you encounter with the Feedback app or directly on GitHub.
In mid-March we released a big bug fix update—elementary OS 8.0.1—and since then we’ve been hard at work on even more bug fixes and some new exciting features that I’m excited to share with you today! Read ahead to find out what we’ve released recently and what you can help us test in Early Access. Quick Settings Quick Settings has a new “Prevent Sleep” toggle Leo added a new “Prevent Sleep” toggle. This is useful when you’re giving a presentation or have a long-running background task where you want to temporarily avoid letting the computer go to sleep on its normal schedule. We also fixed a bug where the “Dark Mode” toggle would cancel the dark mode schedule when used. We now have proper schedule snoozing, so when you manually toggle Dark Mode on or off while using a timed or sunset-to-sunrise schedule, your schedule will resume on the next schedule change instead of being canceled completely. Vishal also fixed an issue that caused some apps to report being improperly closed on system shutdown or restart and on the lock screen we now show the “Suspend” button rather than the “Lock” button. System Settings Locale settings has a fresh layout thanks to Alain with its options aligned more cleanly and improved links to additional settings. Locale Settings has a more responsive design We’ve also added the phrase “about this device” as a search term for the System page and improved interface copy when a restart is required to finish installing updates based on your feedback. Plus, Stanisław improved stylus detection in Wacom settings preventing a crash when no stylus is found. AppCenter We now show a small label next to the download button for apps which contain in-app purchases. This is especially useful for easily identifying free-to-play games or alt stores like Steam or Heroic Games Launcher. AppCenter now shows when apps have in-app purchases Plus, we now reload app icons on-the-fly as their data is processed, thanks to Italo. That means you’ll no longer get occasionally stuck with an AppCenter which shows missing images for app’s who have taken a bit longer than usual to load. Get These Updates As always, pop open System Settings → System on elementary OS 8 and hit “Update All” to get these updates plus your regular security, bug fix, and translation updates. Or set up automatic updates and get a notification when updates are ready to install! Early Access Our development focus recently has been on some of the bigger features that will likely land for either elementary OS 8.1 or 9. We’ve got a new app, big changes to the design of our desktop itself, a whole lot of under-the-hood cleanup, and the return of some key system services thanks to a new open source project. Monitor We’re now shipping a System Monitor app by default By popular demand—and thanks to the hard work of Stanisław—we have a new system monitor app called “Monitor” shipping in Early Access. Monitor provides usage information for your processor, GPU, memory, storage, network, and currently running processes. You can optionally see system information in the panel with Monitor You can also optionally get a ton of glanceable information shown in the panel. There’s currently a lot of work happening to port Monitor to GTK4 and improve its functionality under the Secure Session, so make sure to report any issues you find! Multitasking The Dock is getting a workspace switcher Probably the biggest change to the Pantheon shell since its early inception, the Dock is getting a new workspace switcher! The workspace switcher works in a familiar way to the one you may have seen in the Multitasking View: Your currently open workspaces are represented as tiles with the icons of apps running on them; You can select a workspace to switch to it; You can drag-and-drop workspaces to rearrange them; And you can use the “+” button to create a new blank workspace. One new trick however is that selecting the workspace you’re already on will launch Multitasking View. The new workspace switcher makes it so much more accessible to multitask with just the mouse and get an overview of your workflows without having to first enter the Multitasking View. We’re really excited to hear what people think about it! You can close apps from Multitasking View by swiping up Another very satisfying feature for folks using touch input, you can now swipe up windows in the Multitasking View to close them. This is a really familiar gesture for those of us with Android and iOS devices and feels really natural for managing a big stack of windows without having to aim for a small “x” button. GTK4 Porting We’ve recently landed the port of Tasks to GTK4. So far that comes with a few fixes to tighten up its design, with much more possible in the future. Please make sure to help us test it thoroughly for any regressions! Tasks has a slightly tightened up design We’re also making great progress on porting the panel to GTK4. So far we have branches in review for Nightlight, Bluetooth, Datetime, and Network indicators. Power, Keyboard, and Quick Settings indicators all have in-progress branches. That leaves just Applications, Sound, and Notifications. So far these ports don’t come with major feature changes, but they do involve lots of cleaning up and modernizing of these code bases and in some cases fixing bugs! When the port is finished, we should see immediate performance gains and we’ll have a much better foundation for future releases. You can follow along with our progress porting everything to GTK4 in this GitHub Project. And More When you take a screenshot using keyboard shortcuts or by secondary-clicking an app’s window handle, we now send a notification letting you know that it was succesful and where to find the resulting image. Plus there’s a handy button that opens Files with your screenshot pre-selected. We’re also testing beaconDB as a replacement for Mozilla Location Services (MLS). If you’re not aware, we relied on MLS in previous versions of elementary OS to provide location information for devices that don’t have a GPS radio. Unfortunately Mozilla discontinued the service last June and we’ve been left without a replacement until now. Without these services, not only did maps and weather apps cease to function, but system features like automatic timezone detection and features that rely on sunset and sunrise times no longer work properly. beaconDB offers a drop-in replacement for MLS that uses Wireless networks, bluetooth devices, and cell towers to provide location data when requested. All of its data is crowd-sourced and opt-in and several distributions are now defaulting to using it as their location services data provider. I’ve set up a small sponsorship from elementary on Liberapay to support the project. If you can help support beaconDB either by sponsoring or providing stumbler data, I’d highly encourage you to do so! Sponsors At the moment we’re at 23% of our monthly funding goal and 336 Sponsors on GitHub! Shoutouts to everyone helping us reach our goals here. Your monthly sponsorship funds development and makes sure we have the resources we need to give you the best version of elementary OS we can! Monthly release candidate builds and daily Early Access builds are available to GitHub Sponsors from any tier! Beware that Early Access builds are not considered stable and you will encounter fresh issues when you run them. We’d really appreciate reporting any problems you encounter with the Feedback app or directly on GitHub.
It’s been a little over 100 days since elementary OS 8 was released, and we’re proud to announce another round of updates, including a fresh new download. We’ve been hard at work this winter addressing issues that you reported and we’ve added a couple new creature comforts along the way. This bug fix release also includes the latest Ubuntu LTS Hardware Enablement Kernel, so it’s worth checking out if you downloaded OS 8.0 and it disagreed with your hardware. AppCenter We now properly use dark mode brand colors and dark mode screenshots thanks to Italo. Plus, when developers provide screenshots for multiple desktop environments, we now prefer the ones intended for our desktop environment, Pantheon. We support the new <Developer> Appstream tag, thanks to Juan. And we now support the contribute URL type. AppCenter now shows dark mode screenshots when available Italo also fixed some issues with release notes overflowing out of their container, and we slightly redesigned the release notes window in the Updates page. He also addressed a few other issues in the Updates page that could occur while things were being updated or refreshed and made sure AppCenter recovers gracefully when its cache is emptied. Release notes dialogs have been slightly redesigned Search is also much faster thanks to Leonhard. And for developers, Ryo fixed loading your local metadata for testing with the --load-local terminal option. Files & Terminal Jeremy fixed another half-dozen reported issues in Files, including an issue that prevented entering file paths in search mode, an issue that prevented scrolling after deleting files, and an issue where files would disappear when dropped on an unmounted drive. The New file submenu now respects the hierarchy of folders in Templates. We now also respect the admin:// uri protocol for opening a path as an administrator, and Files is now styled correctly when run as administrator. He also fixed an issue where Terminal tabs took multiple clicks to focus, and an issue where keyboard shortcuts stopped working for tabs that had been dragged into their own new window. Plus, file paths and names are also now properly quoted when drag-and-dropped from Files into Terminal. System Settings System Settings now allows configuring its notifications in System Settings → Notications. So you can turn off bubbles if you don’t want to receive notifications about updates, for example. We’ll also no longer automatically download updates when on metered connections and send a notification instead, thanks to Leonhard. Plus we no longer check for updates in Demo Mode. Updates now show their download size and you can see progress towards our monthly sponsorship goal In System, Vishal made sure we show how large an update will be before downloading it and that we skip held-back packages—such as phased or staged updates—when preparing the updates bundle so that it will more reliably succeed. Alain added a progress bar while downloading. And Ryo made sure the last refresh time is more accurate when no updates are available. Alain also added a new progress bar that represents how close we are to meeting our monthly sponsorship goal. In Applications, you can now disallow notifications access. This is especially useful for apps which use the notifications portal, but don’t properly report their notification usage and can’t be controlled in the Notifications settings page. Reign in apps that don’t appear in Notifications settings In Network there are two new settings: whether a network should be automatically connected to when available and whether to reduce background data usage when connected to that network. Disable autoconnect or mark a network as metered We also updated the pointer icons in Mouse & Touchpad settings and the checkmarks in Locale settings will now respect your chosen accent color. Plus settings pages with sidebars now remember the width you adjusted them to, thanks to Alain. Installation & Onboarding David fixed a crash with certain partitioning schemes in the Installer’s custom install view. And the Encryption step was redesigned to fit on a single page, solving an issue with confusing navigation. Plus, onboarding will now always stay centered on the screen, even when resized. Panel & Quick Settings Ilya fixed an issue with the panel height when using the Classic session and HiDPI displays. The app context menu in the Applications menu now shows a “Keep in Dock” checkbox, just like in the Dock thanks to Stella. In the Power menu, we now show the device model if available, and avoid erroneously showing an empty battery icon thanks to Alain. In the Sound menu, Dmitry fixed loading album art from certain apps like Google Chrome, and we fixed an issue where player icons could become too large. See who else is logged in and quickly switch accounts from Quick Settings In Quick settings, Leonhard fixed an issue with performing updates while shutting down. And Alain added a new page where you can see which other people are logged in and quickly switch between accounts. Dock Leo added a bit more spacing between launchers and their running indicators, and fixed an issue where larger icons could be clipped at the peak of their bounce animation. Apps who don’t notify on startup will no longer bounce in the dock indefinitely, thanks to Leonhard. We fixed an issue where the dock would still receive click events while hidden in the Classic session. Plus the dock now has an opaque style when “Panel Translucency” is turned off in System Settings → Desktop → Dock & Panel. Window Manager We have another huge release of our window manager thanks to Leonhard and Leo. This release fixes five potential crashes, over a dozen reported issues, fixes related to both the Classic and Secure sessions, issues related to HiDPI, and more, plus performance improvements. It’s worth reading the full release notes on GitHub if you have been waiting for the fix for a specific issue. And More OS 8.0.1 includes the latest long-term support Hardware Enablement stack from Ubuntu, including Linux 6.11. This brings improved performance for AMD processors, support for Intel “Lunar Lake” processors, and filesystem performance improvements in some cases. Plus support for certain webcams, USB network devices, joysticks, and more. Leo fixed an issue where connecting Bluetooth devices could cause the Lock Screen to freeze. You can now close the captive network assistant with the keyboard shortcut Ctrl + Q, thanks to Stanisław. And Alain fixed copying screenshots to the clipboard. We fixed an issue where wired network connections could fail to connect due to a change in Ubuntu. We’re pursuing this issue upstream and working on a way to ship the fix as an update, but for now fixing this issue requires either manual intervention through Terminal or a reinstall. We also now pre-install an AppArmor profile that fixes a number of Flatpak-related issues like not being to install certain runtime updates or apps not launching in the guest session or Demo mode. Special thanks to Uncle Tallest for investigating this issue and helping folks in our Discord who ran into it. And of course this release comes with a ton of translation updates! Special thanks to our hard-working internationalization community and especially Ryo who fixed a number of issues with things that couldn’t be localized properly in the previous release. Get elementary OS 8.0.1 elementary OS 8.0.1 is available as a pay-what-you-can purchase at elementary.io today. Localized direct downloads and a torrent magnet link are provided. OS 8 FAQ Download elementary OS 8.0.1 Sponsors have been able to download OS 8.0.1 release candidates since last week, so if getting things before anyone else is important to you, consider sponsoring us on GitHub
It’s only been a little over 2 weeks since we released elementary OS 8, but we’re already back with updates just in time for the holidays! Terminal The headliner this month is Terminal which comes with a bunch of fixes and new features thanks to Jeremy. It now uses the more modern tab bar widget you’re used to from Web, Files, and Code. There’s an overlay bar that shows the current zoom level when it changes. We do a better job of handling URIs which contain spaces. And we now show unsafe paste warnings for Drag n Drop operations. Plus, we now show the unsafe paste warning for more commands like doas thanks to Elsie and there’s a new option in the gear menu to toggle unsafe paste alerts thanks to Stella and Charlie. Michal upped the contrast for gray in our default style and Igor made sure we focus the relevant tab when notifications are clicked. Plus, we now replace notifications from the same tab and withdraw notifications when a tab is focused, so your notification center should be a lot less noisy. This release was really a group effort with several new contributors, so major shoutouts to everyone who worked on it! AppCenter AppCenter will use Dark Mode screenshots when available Thanks to Italo, AppCenter will now use provided dark mode screenshots and brand colors when developers provide them. Plus, he addressed a visual bug with release notes. And Juan added support for the latest Appstream Developer tag, so we’re staying up on standards. Window Manager & Dock In the Window Manager, Leo fixed an issue where the dock could sometimes still be clicked when hidden in the Classic session, while Leonhard contributed some performance improvements. In the Dock, Leonhard made sure launcher bounces don’t run too long for apps that don’t notify on startup. Leo fixed an issue where launchers with large icons could become clipped while they bounce and made sure running indicators have a bit more room to breath. Plus the dock now also respects the “Panel Translucency” setting, making it completely solid when requested for added contrast. System Settings Alain added some visual polish to the System view as well as a new progress bar that represents how close we are to meeting our monthly sponsorship goal. Plus Leonhard made sure automatic updates won’t download on metered networks, and we avoid checking for system updates altogether in Demo Mode. We now show monthly funding goal progress right in System Settings You can now prevent Apps from sending notifications from Applications → Permissions, even for apps that don’t report their notification usage in Notification settings. and the check mark next to the current language in Language & Region settings will now follow your accent color thanks to Leo. Installation & Onboarding David fixed a crash with certain partitioning schemes in the Installer’s custom install view, and the encrypt view was simplified. Onboarding will now always stay centered on the screen, even when resized. Icon Browser A new version of the Icon Browser for app developers is available in AppCenter that includes the latest icons for Platform 8 as well as a quick button for copying code snippets thanks to Ryo. And we now focus the search automatically when you start typing, thanks to Alain. And More You can now close the captive network assistant with the keyboard shortcut Ctrl + Q, thanks to Stanisław. Alain fixed copying screenshots to the clipboard. And there a ton of translation updates, especially including traditional Chinese thanks to Kisaragi. Sponsors At the moment we’re at 22% of our monthly funding goal and 430 Sponsors on GitHub! Shoutouts to everyone helping us reach our goals here. Your monthly sponsorship funds development and makes sure we have the resources we need to give you the best version of elementary OS we can! Monthly release candidate builds and daily Early Access builds are available to GitHub Sponsors from any tier! Beware that Early Access builds are not considered stable and you will encounter fresh issues when you run them. We’d really appreciate reporting any problems you encounter with the Feedback app or directly on GitHub.
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I realize that for all I've talked about Logic for Programmers in this newsletter, I never once explained basic logical quantifiers. They're both simple and incredibly useful, so let's do that this week! Sets and quantifiers A set is a collection of unordered, unique elements. {1, 2, 3, …} is a set, as are "every programming language", "every programming language's Wikipedia page", and "every function ever defined in any programming language's standard library". You can put whatever you want in a set, with some very specific limitations to avoid certain paradoxes.2 Once we have a set, we can ask "is something true for all elements of the set" and "is something true for at least one element of the set?" IE, is it true that every programming language has a set collection type in the core language? We would write it like this: # all of them all l in ProgrammingLanguages: HasSetType(l) # at least one some l in ProgrammingLanguages: HasSetType(l) This is the notation I use in the book because it's easy to read, type, and search for. Mathematicians historically had a few different formats; the one I grew up with was ∀x ∈ set: P(x) to mean all x in set, and ∃ to mean some. I use these when writing for just myself, but find them confusing to programmers when communicating. "All" and "some" are respectively referred to as "universal" and "existential" quantifiers. Some cool properties We can simplify expressions with quantifiers, in the same way that we can simplify !(x && y) to !x || !y. First of all, quantifiers are commutative with themselves. some x: some y: P(x,y) is the same as some y: some x: P(x, y). For this reason we can write some x, y: P(x,y) as shorthand. We can even do this when quantifying over different sets, writing some x, x' in X, y in Y instead of some x, x' in X: some y in Y. We can not do this with "alternating quantifiers": all p in Person: some m in Person: Mother(m, p) says that every person has a mother. some m in Person: all p in Person: Mother(m, p) says that someone is every person's mother. Second, existentials distribute over || while universals distribute over &&. "There is some url which returns a 403 or 404" is the same as "there is some url which returns a 403 or some url that returns a 404", and "all PRs pass the linter and the test suites" is the same as "all PRs pass the linter and all PRs pass the test suites". Finally, some and all are duals: some x: P(x) == !(all x: !P(x)), and vice-versa. Intuitively: if some file is malicious, it's not true that all files are benign. All these rules together mean we can manipulate quantifiers almost as easily as we can manipulate regular booleans, putting them in whatever form is easiest to use in programming. Speaking of which, how do we use this in in programming? How we use this in programming First of all, people clearly have a need for directly using quantifiers in code. If we have something of the form: for x in list: if P(x): return true return false That's just some x in list: P(x). And this is a prevalent pattern, as you can see by using GitHub code search. It finds over 500k examples of this pattern in Python alone! That can be simplified via using the language's built-in quantifiers: the Python would be any(P(x) for x in list). (Note this is not quantifying over sets but iterables. But the idea translates cleanly enough.) More generally, quantifiers are a key way we express higher-level properties of software. What does it mean for a list to be sorted in ascending order? That all i, j in 0..<len(l): if i < j then l[i] <= l[j]. When should a ratchet test fail? When some f in functions - exceptions: Uses(f, bad_function). Should the image classifier work upside down? all i in images: classify(i) == classify(rotate(i, 180)). These are the properties we verify with tests and types and MISU and whatnot;1 it helps to be able to make them explicit! One cool use case that'll be in the book's next version: database invariants are universal statements over the set of all records, like all a in accounts: a.balance > 0. That's enforceable with a CHECK constraint. But what about something like all i, i' in intervals: NoOverlap(i, i')? That isn't covered by CHECK, since it spans two rows. Quantifier duality to the rescue! The invariant is equivalent to !(some i, i' in intervals: Overlap(i, i')), so is preserved if the query SELECT COUNT(*) FROM intervals CROSS JOIN intervals … returns 0 rows. This means we can test it via a database trigger.3 There are a lot more use cases for quantifiers, but this is enough to introduce the ideas! Next week's the one year anniversary of the book entering early access, so I'll be writing a bit about that experience and how the book changed. It's crazy how crude v0.1 was compared to the current version. MISU ("make illegal states unrepresentable") means using data representations that rule out invalid values. For example, if you have a location -> Optional(item) lookup and want to make sure that each item is in exactly one location, consider instead changing the map to item -> location. This is a means of implementing the property all i in item, l, l' in location: if ItemIn(i, l) && l != l' then !ItemIn(i, l'). ↩ Specifically, a set can't be an element of itself, which rules out constructing things like "the set of all sets" or "the set of sets that don't contain themselves". ↩ Though note that when you're inserting or updating an interval, you already have that row's fields in the trigger's NEW keyword. So you can just query !(some i in intervals: Overlap(new, i')), which is more efficient. ↩
After shipping my work transforming HTML with Netlify’s edge functions I realized I have a little bug: the order of the icons specified in the URL doesn’t match the order in which they are displayed on screen. Why’s this happening? I have a bunch of links in my HTML document, like this: <icon-list> <a href="/1/">…</a> <a href="/2/">…</a> <a href="/3/">…</a> <!-- 2000+ more --> </icon-list> I use html-rewriter in my edge function to strip out the HTML for icons not specified in the URL. So for a request to: /lookup?id=1&id=2 My HTML will be transformed like so: <icon-list> <!-- Parser keeps these two --> <a href="/1/">…</a> <a href="/2/">…</a> <!-- But removes this one --> <a href="/3/">…</a> </icon-list> Resulting in less HTML over the wire to the client. But what about the order of the IDs in the URL? What if the request is to: /lookup?id=2&id=1 Instead of: /lookup?id=1&id=2 In the source HTML document containing all the icons, they’re marked up in reverse chronological order. But the request for this page may specify a different order for icons in the URL. So how do I rewrite the HTML to match the URL’s ordering? The problem is that html-rewriter doesn’t give me a fully-parsed DOM to work with. I can’t do things like “move this node to the top” or “move this node to position x”. With html-rewriter, you only “see” each element as it streams past. Once it passes by, your chance at modifying it is gone. (It seems that’s just the way these edge function tools are designed to work, keeps them lean and performant and I can’t shoot myself in the foot). So how do I change the icon’s display order to match what’s in the URL if I can’t modify the order of the elements in the HTML? CSS to the rescue! Because my markup is just a bunch of <a> tags inside a custom element and I’m using CSS grid for layout, I can use the order property in CSS! All the IDs are in the URL, and their position as parameters has meaning, so I assign their ordering to each element as it passes by html-rewriter. Here’s some pseudo code: // Get all the IDs in the URL const ids = url.searchParams.getAll("id"); // Select all the icons in the HTML rewriter.on("icon-list a", { element: (element) => { // Get the ID const id = element.getAttribute('id'); // If it's in our list, set it's order // position from the URL if (ids.includes(id)) { const order = ids.indexOf(id); element.setAttribute( "style", `order: ${order}` ); // Otherwise, remove it } else { element.remove(); } }, }); Boom! I didn’t have to change the order in the source HTML document, but I can still get the displaying ordering to match what’s in the URL. I love shifty little workarounds like this! Email · Mastodon · Bluesky
In the previous article, we peeked at the reset circuit of ESP-Prog with an oscilloscope, and reproduced it with basic components. We observed that it did not behave quite as expected. In this article, we’ll look into the missing pieces. An incomplete circuit For a hint, we’ll first look a bit more closely at the … Continue reading The missing part of Espressif’s reset circuit → The post The missing part of Espressif’s reset circuit appeared first on Quentin Santos.
Snippets are a useful addition to Svelte 5. I use them in my Svelte 5 projects like Edna. Snippet basics A snippet is a function that renders html based on its arguments. Here’s how to define and use a snippet: {#snippet hello(name)} <div>Hello {name}!</div> {/snippet} {@render hello("Andrew")} {@render hello("Amy")} You can re-use snippets by exporting them: <script module> export { hello }; </script> {@snippet hello(name)}<div>Hello {name}!</div>{/snippet} Snippets use cases Snippets for less nesting Deeply nested html is hard to read. You can use snippets to extract some parts to make the structure clearer. For example, you can transform: <div> <div class="flex justify-end mt-2"> <button onclick={onclose} class="mr-4 px-4 py-1 border border-black hover:bg-gray-100" >Cancel</button > <button onclick={() => emitRename()} disabled={!canRename} class="px-4 py-1 border border-black hover:bg-gray-50 disabled:text-gray-400 disabled:border-gray-400 disabled:bg-white default:bg-slate-700" >Rename</button > </div> into: {#snippet buttonCancel()} <button onclick={onclose} class="mr-4 px-4 py-1 border border-black hover:bg-gray-100" >Cancel</button > {/snippet} {#snippet buttonRename()}...{/snippet} To make this easier to read: <div> <div class="flex justify-end mt-2"> {@render buttonCancel()} {@render buttonRename()} </div> </div> snippets replace default <slot/> In Svelte 4, if you wanted place some HTML inside the component, you used <slot />. Let’s say you have Overlay.svelte component used like this: <Overlay> <MyDialog></MyDialog> </Overlay> In Svelte 4, you would use <slot /> to render children: <div class="overlay-wrapper"> <slot /> </div> <slot /> would be replaced with <MyDialog></MyDialog>. In Svelte 5 <MyDialog></MyDialog> is passed to Overlay.svelte as children property so you would change Overlay.svelte to: <script> let { children } = $props(); </script> <div class="overlay-wrapper"> {@render children()} </div> children property is created by Svelte compiler so you should avoid naming your own props children. snippets replace named slots A component can have a default slot for rendering children and additional named slots. In Svelte 5 instead of named slots you pass snippets as props. An example of Dialog.svelte: <script> let { title, children } = $props(); </script> <div class="dialog"> <div class="title"> {@render title()} </div> {@render children()} </div> And use: {#snippet title()} <div class="fancy-title">My fancy title</div> {/snippet} <Dialog title={title}> <div>Body of the dialog</div> </Dialog> passing snippets as implicit props You can pass title snippet prop implicitly: <Dialog> {#snippet title()} <div class="fancy-title">My fancy title</div> {/snippet} <div>Body of the dialog</div> </Dialog> Because {snippet title()} is a child or <Dialog>, we don’t have to pass it as explicit title={title} prop. The compiler does it for us. snippets to reduce repetition Here’s part of how I render https://tools.arslexis.io/ {#snippet row(name, url, desc)} <tr> <td class="text-left align-top" ><a class="font-semibold whitespace-nowrap" href={url}>{name}</a> </td> <td class="pl-4 align-top">{@html desc}</td> </tr> {/snippet} {@render row("unzip", "/unzip/", "unzip a file in the browser")} {@render row("wc", "/wc/", "like <tt>wc</tt>, but in the browser")} It saves me copy & paste of the same HTML and makes the structure more readable. snippets for recursive rendering Sometimes you need to render a recursive structure, like nested menus or file tree. In Svelte 4 you could use <svelte:self> but the downside of that is that you create multiple instances of the component. That means that the state is also split among multiple instances. That makes it harder to implement functionality that requires a global view of the structure, like keyboard navigation. With snippets you can render things recursively in a single instance of the component. I used it to implement nested context menus. snippets to customize rendering Let’s say you’re building a Menu component. Each menu item is a <div> with some non-trivial children. To allow the client of Menu customize how items are rendered, you could provide props for things like colors, padding etc. or you could allow ultimate flexibility by accepting an optional menuitem prop that is a snippet that renders the item. You can think of it as a headless UI i.e. you provide the necessary structure and difficult logic like keyboard navigation etc. and allow the client lots of control over how things are rendered. snippets for library of icons Before snippets every SVG Icon I used was a Svelte component. Many icons means many files. Now I have a single Icons.svelte file, like: <script module> export { IconMenu, IconSettings }; </script> {#snippet IconMenu(arg1, arg2, ...)} <svg>... icon svg</svg> {/snippet}} {#snippet IconSettings()} <svg>... icon svg</svg> {/snippet}}
Here are a few tangentially-related ideas vaguely near the theme of comparison operators. comparison style clamp style clamp is median clamp in range range style style clash? comparison style Some languages such as BCPL, Icon, Python have chained comparison operators, like if min <= x <= max: ... In languages without chained comparison, I like to write comparisons as if they were chained, like, if min <= x && x <= max { // ... } A rule of thumb is to prefer less than (or equal) operators and avoid greater than. In a sequence of comparisons, order values from (expected) least to greatest. clamp style The clamp() function ensures a value is between some min and max, def clamp(min, x, max): if x < min: return min if max < x: return max return x I like to order its arguments matching the expected order of the values, following my rule of thumb for comparisons. (I used that flavour of clamp() in my article about GCRA.) But I seem to be unusual in this preference, based on a few examples I have seen recently. clamp is median Last month, Fabian Giesen pointed out a way to resolve this difference of opinion: A function that returns the median of three values is equivalent to a clamp() function that doesn’t care about the order of its arguments. This version is written so that it returns NaN if any of its arguments is NaN. (When an argument is NaN, both of its comparisons will be false.) fn med3(a: f64, b: f64, c: f64) -> f64 { match (a <= b, b <= c, c <= a) { (false, false, false) => f64::NAN, (false, false, true) => b, // a > b > c (false, true, false) => a, // c > a > b (false, true, true) => c, // b <= c <= a (true, false, false) => c, // b > c > a (true, false, true) => a, // c <= a <= b (true, true, false) => b, // a <= b <= c (true, true, true) => b, // a == b == c } } When two of its arguments are constant, med3() should compile to the same code as a simple clamp(); but med3()’s misuse-resistance comes at a small cost when the arguments are not known at compile time. clamp in range If your language has proper range types, there is a nicer way to make clamp() resistant to misuse: fn clamp(x: f64, r: RangeInclusive<f64>) -> f64 { let (&min,&max) = (r.start(), r.end()); if x < min { return min } if max < x { return max } return x; } let x = clamp(x, MIN..=MAX); range style For a long time I have been fond of the idea of a simple counting for loop that matches the syntax of chained comparisons, like for min <= x <= max: ... By itself this is silly: too cute and too ad-hoc. I’m also dissatisfied with the range or slice syntax in basically every programming language I’ve seen. I thought it might be nice if the cute comparison and iteration syntaxes were aspects of a more generally useful range syntax, but I couldn’t make it work. Until recently when I realised I could make use of prefix or mixfix syntax, instead of confining myself to infix. So now my fantasy pet range syntax looks like >= min < max // half-open >= min <= max // inclusive And you might use it in a pattern match if x is >= min < max { // ... } Or as an iterator for x in >= min < max { // ... } Or to take a slice xs[>= min < max] style clash? It’s kind of ironic that these range examples don’t follow the left-to-right, lesser-to-greater rule of thumb that this post started off with. (x is not lexically between min and max!) But that rule of thumb is really intended for languages such as C that don’t have ranges. Careful stylistic conventions can help to avoid mistakes in nontrivial conditional expressions. It’s much better if language and library features reduce the need for nontrivial conditions and catch mistakes automatically.
