Although FreeRTOS1 is an indispensible tool for working on anything more than the simplest application on ESP32, there are some difficulties to master, such as multitasking. Multitasking using FreeRTOS is accomplished by creating tasks with xTaskCreate() or xTaskCreatePinnedToCore(). In both of these calls, one of the parameters is uxStackDepth which is the allocated stack size for the task. The FreeRTOS documentation on the subject is clear about the units for uxStackDepth:
Hazel is a centrepiece of my automation suite on macOS. I rely on it to watch directories and take complex actions on files contained within them. Recently I discovered an issue with files that are locked in the Finder. If files that otherwise match all the rules are locked, then Hazel will attempt to execute the rules. But the locked status may preclude execution. For example, I began seeing frequent Hazel notifications popups such as:
Obsidian is pretty reckless with file creation dates. If you modify a note in Obsidian, it updates the file creation date. This renders Dataview queries that rely on it useless. For an introduction to this issue, see this lengthy thread on the Obsidian forums.
Workarounds There are a several solutions to this problem.
- YAML-based dates One can include a cdate (or similar) field in the note’s front matter and just direct the Dataview query against that, e.
If you modify a file in-place using sed with the -i option, you will get a file that has a new file creation date. On macOS 13.3.1, this is absolutely 100% true, although you will read claims otherwise. I ran into this problem while implementing a Hazel rule that updates YAML automatically in my Obsidian notes.
Background I have use YAML frontmatter in my Obsidian notes. It looks like:
—uid:20221120152124aliases:[20221120152124,AllAboutShell]cdate:2022-11-2015:21mdate:2023-05-1805:14type:zettel— My goal is to update the mdate field whenever the file changes.
I use Hazel extensively for automating file management tasks on my macOS systems. Recently I found that Hazel aggressively matches an invisible system file that appears whenever you use a custom file or folder icon. I’ll describe the problem and present a workaround.
In a handful of directories, I have a rule that prevents users (me) from adding certain file types. So the rule just matches any file that is not an image, for example, and deletes it.
Although I’m a relative newcomer to Obsidian, I like what I see, especially the templating and data access functionality - both that provided natively and through the Templater and Dataview plugins.
One missing piece is the ability to dynamically update the YAML-formatted metadata in the frontmatter of Obsidian’s Markdown documents. Several threads on both the official support forums and on r/ObsidianMD have addressed this; and there seems to be no real solution.
There are a couple features of the Dataview plugin for Obsidian that aren’t documented and are potentially useful.
For the start of the week, use date(sow) and for the end of the week date(eow). Since there’s no documentation as of yet, I’ll venture a guess that they are locale-dependendent. For me (in Canada), sow is Monday. Since I do my weekly notes on Saturday, I have to subtract a couple days to point to them.
Most language learners are familiar with Forvo, a site that allows users to download and contribute pronunciations for words and phrases. For my Russian studies, I make daily use of the site. In fact, to facilitate my Anki card-making workflow, I am a paid user of the Forvo API. But that’s where the trouble started.
When the Forvo API works, it works OK, often extremely slow. But lately, it has been down more than up.
Recently, someone asked a question on r/Anki about changing and existing cloze-type note to a regular note. Part of the solution involves stripping the cloze markup from the existing cloze’d field. A cloze sentence has the form Play {{c1::studid}} games. or Play {{c1::stupid::pejorative adj}} games.
To handle both of these cases, the following regular expression will work. Just substitute for $1. {{c\d::([^:}]+)(?:::+[^}])}}
However, the Cloze Anything markup is different. It uses ( and ) instead of curly braces.
I was using a REST API at
https://textance.herokuapp.com/title but it seems awfully fragile. Sure enough this morning, the entire application is down. It’s also not open-source and I have no idea who actually runs this thing.
Here’s the solution:
#!/bin/bash url=$(pbpaste) curl $url -so - | pup 'meta[property=og:title] attr{content}' It does require pup. On macOS, you can install via brew install pup.
There are other ways using regular expressions but no dependency on pup but parsing HTML with regex is not such a good idea.