Pentive
electric
Pentive | electric | |
---|---|---|
11 | 27 | |
31 | 4,831 | |
- | 7.5% | |
9.7 | 9.8 | |
8 days ago | 6 days ago | |
TypeScript | Elixir | |
Apache License 2.0 | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Pentive
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Anki – Powerful, intelligent flash cards
> I wonder what the ecosystem would look like if things were otherwise.
Shameless plug - I'm building https://github.com/AlexErrant/Pentive which is basically GitHub/Reddit for flashcards. Very much pre-product and a WIP, though the offline client proof of concept is done.
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Lessons from building GitHub code search [video]
I also enjoyed the Treesitter talk from 5 years ago by Max Brunsfeld https://www.youtube.com/watch?v=Jes3bD6P0To
I'm currently building a query language whose grammar is very much inspired by Github's search syntax. I'm using Lezer, which is a GLR like Treesitter, so this talk learned me some parser generators (I've no formal CS education). Here's my grammar, a playground, and an example search query if anyone wants to play with it
https://github.com/AlexErrant/Pentive/blob/main/app/src/quer...
https://littletools.app/lezer
-(a) spider-man -a b -c -"(quote\\"d) str" OR "l o l" OR a b c ((a "c") b) tag:what -deck:"x y"
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Using spaced repetition systems to see through a piece of mathematics
Not really. There are options for sharing cards on Anki https://www.reddit.com/r/Anki/comments/14j2jfy/deck_sharing_... but their collaboration features are limited.
I myself am building an Anki clone https://github.com/AlexErrant/Pentive with collaboration built in as a first class citizen, though its far from primetime. Currently stewing on how to get the SR algorithm, FSRS, to compile to wasm.
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Ask HN: Show me your half baked project
https://github.com/AlexErrant/Pentive
A free, open source, local-first, spaced repetition system that works offline, has p2p syncing, plugins, and first class support for collaboration. It's GitHub/Reddit for flashcards.
I basically took Anki and turned it into a webapp >_>
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Things you forgot because of React
I find Solid's model pretty damn close to "compiling down to nothing". I chose Solid for my project because I wanted to support plugins that used other UI frameworks. I recently got a Svelte plugin working with the SolidJS router. I could probably make it prettier... but it's literally a call to Solid's `createComponent` with the Router and an anchoring div to which the Svelte component is mounted. Ezpz.
https://github.com/AlexErrant/Pentive/blob/main/example-plug...
- Mycelite: SQLite extension to synchronize changes across SQLite instances
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An open source web-based flashcard studying system
I'm also building an Anki clone (sigh) that I'm calling "Github for flashcards".
>A free, open source, local-first, spaced repetition system that works offline, has p2p syncing, plugins, and first class support for collaboration.
https://github.com/AlexErrant/Pentive
Very much a WIP, completely unusable, but I recently made a video demoing the technical proof of concept.
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Anki-Fy Your Life
Anki, imo, already has an open algorithm (that the user can change via plugins), universal interfaces, and is "self-hosted". My eyes perked up at REST api, but it doesn't look like there's a centralized server that hosts shared cards, which is where my mind went.
I'm building https://github.com/AlexErrant/Pentive/ which is basically Anki + Reddit - people can optionally upload their cards for others to download, and the most popular cards rise to the top. It's FLOSS, offline-first, supports plugins and p2p syncing, and is very much a WIP. My proof of concept is almost done though, which demos the critical technologies in a secure way.
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A Gentle Introduction to CRDTs
I'm using cr-sqlite right now in my Anki clone: https://github.com/AlexErrant/Pentive
It's basically an offline-first flashcard webapp. CR-Sqlite allows for incremental syncing.
With Anki (the app from which I'm taking my inspiration), syncing is _not_ incremental - basically it just copies SQLite files around. So for example, the app could be on an iPhone with cards a card `A` reviewed, but the app on an iPad could make changes to the template on which card `A` is based, and that's enough to cause a conflict - you must take changes from only the iPad or only the iPhone. (To be clear - Anki does have some incremental syncing capabilities - I'm picking an intentionally pathological example.) CR-SQLite will mean that everything is incremental, however.
Basically makes 3 way merges a breeze (or n-way merges, really).
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Ask HN: What Are You Working on This Year?
A FLOSS, offline-first, spaced repetition system that has first class support for collaboration, curation, and plugins. It's Reddit for flashcards.
https://github.com/AlexErrant/Pentive
I've been thinking about this for a stupid amount of time... thinking that someday someone's going to improve on Anki. Finally got tired of it and said that person's me.
electric
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Ask HN: How Can I Make My Front End React to Database Changes in Real-Time?
I'm interested in this problem also!
I think there is a large overlap with projects that market/focus on offline-first experiences.
AFAIK this problem can be solved by:
1) Considering a client-side copy of the database that gets synced with the remote DB. This is an approach [PowerSync](https://www.powersync.com/) and [ElectricSql](https://electric-sql.com/) and [rxdb](https://rxdb.info/) take!
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Cloudflare acquires PartyKit to allow developers to build real-time multi-user
Yeah I agree with it being an exaggeration. They are certainly riding the admittedly dated perception that realtime is so hard it's only available to the Googles and Figmas. But there's now some amazing open source solutions available like Y.js and ElectricSQL[1]. The barrier has certainly come down.
[1] https://github.com/electric-sql/electric
- Ask HN: Who is hiring? (April 2024)
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- Show HN: RemoteStorage – sync localStorage across devices and browsers
- I pwned half of America's fast food chains, simultaneously
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PostgreSQL 16 Bi-Directional Logical Replication
https://github.com/electric-sql/electric :
> ElectricSQL is a local-first software platform that makes it easy to develop high-quality, modern apps with instant reactivity, realtime multi-user collaboration and conflict-free offline support.
> Local-first is a new development paradigm where your app code talks directly to an embedded local database and data syncs in the background via active-active database replication. Because the app code talks directly to a local database, apps feel instant. Because data syncs in the background via active-active replication it naturally supports multi-user collaboration and conflict-free offline
"SQLedge: Replicate Postgres to SQLite on the Edge" (2023)
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Show HN: PowerSync – Bi-directional Postgres<>SQLite sync for offline-first apps
Yup, this is correct.
We have had some requests / discussions around adding hooks to the sync service that will support custom logic on the write path (as per https://github.com/electric-sql/electric/discussions/565). This seems like a good idea but they don't exist yet.
- Electric SQL – Local-first sync layer for web and mobile apps
What are some alternatives?
fsrs4anki - A modern Anki custom scheduling based on Free Spaced Repetition Scheduler algorithm
fulcro - A library for development of single-page full-stack web applications in clj/cljs
mycelite - Mycelite is a SQLite extension that allows you to synchronize changes from one instance of SQLite to another.
cr-sqlite - Convergent, Replicated SQLite. Multi-writer and CRDT support for SQLite
proposal-shadowrealm - ECMAScript Proposal, specs, and reference implementation for Realms
crdt-benchmarks - A collection of CRDT benchmarks
shellrunner - Write safe shell scripts in Python.
wundergraph - WunderGraph is a Backend for Frontend Framework to optimize frontend, fullstack and backend developer workflows through API Composition.
vm2-process - Execute unsafe javascript code in a sandbox
multiversion-concurrency-control - Implementation of multiversion concurrency control, Raft, Left Right concurrency Hashmaps and a multi consumer multi producer Ringbuffer, concurrent and parallel load-balanced loops, parallel actors implementation in Main.java, Actor2.java and a parallel interpreter
ankivalenz - Turn HTML files into Anki decks