Today I Learned

Damn 2024 is such a shit show, now Devin seems to be out as a complete scam. It’s really teaching us to have skepticism for what you find on the internet. Turns out that when broken down frame by frame much of the description in the video was a straight up lie. Personally it seemed quite plausible that it was percentage points better than the competition, but I was not holding my breath for it to be a hands off engineer.

I learned about the sqlite_master table from this stack overflow answer. This helps make a lot of sense to how sqlite works. The master table contains all the sqlite objects and the sql to create them.

The .tables, and .schema “helper” functions don’t look into ATTACHed databases: they just query the SQLITE_MASTER table for the “main” database. Consequently, if you used

I’ve really been enjoying using sqlmodel for my projects that need a database. One thing that I definitely lacked on for too long was indexing my database. I hit a point with one database where it was taking 7s for pretty simple paginated queries to return 10 records.

For every field that you will be querying on, you can create an index, by setting it equal to Field(index=True)

class Hero(SQLModel, table=True): id: int | None = Field(default=None, primary_key=True) name: str = Field(index=True) secret_name: str age: int | None = Field(default=None, index=True)

example courtesy of the docs

The docs cover this pretty well, and in quite depth - Optimizing Queries

This is a cool snapshot testing tool that automatically creates, and updates test values for you.

Starting with some test code.

from inline_snapshot import snapshot def something(): return 1548 * 18489 def test_something(): assert something() == snapshot()

now if I run pytest my tests will fail because my assert will fail, but if I run pytest --inline-snapshot=create it will fill out my snapshot values and the file will then look like this.

inline-snapshot is a new tool that I am trying out for python testing. It takes snapshots of your outputs and places them inline with the test.

Here is the most basic starter.

import inline_snapshot def test_one(): assert 1 == snapshot()

Now when I run pytest my tests will fail because my assert has no value, but if I run pytest --inline-snapshot=create it will fill out my snapshot values and the file will then look like this.

import inline_snapshot def test_one(): assert 1 == snapshot(1)

It also works with pydantic models.

nalgeon has done a fantastic job with redka. Highly recommend taking a look.

Redis re-implemented with SQLite

Redka a sick new redis compatable api, that uses sqlite as its backend datastore. It feels lightweight to use as it is a single small binary. Data does not have to fit into memory as it uses sqlite to store data.

Today I learned how to VACUUM a sqlite database and cut its size in about half. It’s a database that I have had running for quite awhile and has some decent traffic on it.

Why is it important to do a VACUUM? In short its becuase the file system gets fragmented with as data is updated. On delete the files are removed from the database and marked as available for reuse in the filesystem, but the space is not reclaimed.

To VACUUM a database, run the following sql command. You can do it right form the sqlite shell by running sqlite3.

You will need about double the current size of the database as free space to do the VACUUM, you need space for a full copy, journaling or write ahead logs, and the existing database.

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Check your system to see if you are vulnerable to the xz backdoor.

I found this line most pertanent to me.

The xz packages prior to version 5.6.1-2 (specifically 5.6.0-1 and 5.6.1-1) contain this backdoor.

Also it appears that arch is not vulnerable as it does not directly link openssh to liblzma, so the known attack vecotor is not possible. read to the end of the linked article for more.

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Install it

{ "ThePrimeagen/harpoon", branch = "harpoon2", dependencies = { "nvim-lua/plenary.nvim" }, config = function() require("waylonwalker.plugins.harpoon").setup() end, },

harpoon config

I learned that tailwind animations are pretty easy to add only needing a few classes. For some reason though my brain broke, thinking that I could dynamically change the number and you can’t cause there are only so many pre compiled classes without using an arbitrary value with brackets.

Here are the classes that I used to transition my colors very slowly.

<div id="square" class="transition-colors ease-in-out duration-700"> </div>

And the entire square element.

I recently updated ollama, and it now installs a systemd service that I was not expecting. Seems like a great option, but I hadn’t expeted this and I was able to kill it previously. It was using up gpu, and I do other things on my machine with a gpu. I tried pkill, kill, and everything, it was still coming back.

No matter what it comes back

# stop it systemctl stop ollama.service # disable it if you want systemctl disable ollama.service # confirm its status systemctl status ollama.service

You can confirm this with the following command.

# checking running processes ps aux | grep ollama pgrep ollama # checking gpu processes gpustat --show-cmd --show-pid

Next time you want to start you can do it as before with ollama serve.

I found this statement quite intriguing.

multi-cursors are just macros.

This is quite a philisophical video and mostly prime talking about the things that make vim vim, and what prime needs in and editor vs what he can live without.

Typer makes it easy to compose your cli applications, like you might with a web router if you are more familiar with that. This allows you to build smaller applications that compose into a larger application.

You will see similar patterns in the wild, namely the aws cli which always has the aws <command> <subcommand> pattern.

Lets setup the cli app itself first. You can put it in project/cli/cli.py.

import typer from project.cli.api import api_app from project.cli.config import config_app from project.cli.user import user_app from project.cli.run import run_app app = typer.Typer() app.add_typer(api_app, name="api") app.add_typer(config_app, name="config") app.add_typer(user_app, name="user") app.add_typer(run_app, name="run")

Creating an app that will become a command is the same as creating a regular app in Typer. We need to create a callback that will become our command, and a command that will become our subcommand in the parent app.

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I learned not to fear the arbitrary size feature of tailwind. While building out reader.waylonwalker.com I kept getting content flowing off the screen, and struggling to keep it on the screen. I really felt that I should be able to do this with vanilla tailwind, but after some encouragement from Twitter I decided to lean on arbitrary values and it worked.

Don’t fear the arbitrary values.

<li class="max-w-[100vw]"> </li>

Learn more about using-arbitrary-values from their docs docs

This is pretty sick, I wanted this early on when I was making lockhart. I wanted to do the git hook thing but could not figure it out and did not know that prepare-commit-msg was a hook that I could use.

Git Hooked Then I remembered! Git hooks! Lol. Why would I have that in my brain - who knows!

I asked claude again, and they whipped up a simple script that would act as a hook that triggers with the prepare-commit-msg event.

This is awesome, cuz if you want to add a git message, you can skip the hook. But if you are lazy, you exclude the message and it will call the LLM.

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Each time I go to set up npm I am frustrated by the errors saying that I don’t have permission to npm i -g <package>, and it’s frustrating. And I forget what I need to do to tell npm to install packages in a directory I own, and my shell to look there so that I can use the executables.

mkdir ~/.npm-global export NPM_CONFIG_PREFIX=~/.npm-global export PATH=$PATH:~/.npm-global/bin

For the fix to remain persistent you need to put these two lines in your shell profile like ~/.bashrc or ~/.zshrc.

If you are designing a website in dark mode the scrollbars can be finicky to match the theme. Here is a pretty sane default that looks nice without being obnoxiously contrast to the rest of the site.

<style> ::-webkit-scrollbar { height: 1rem; width: 1rem; } ::-webkit-scrollbar-track { background-color: rgb(24 24 27); } body::-webkit-scrollbar-track { background-color: rgb(39 39 42); } ::-webkit-scrollbar-thumb { background-color: rgb(82 82 91); } ::-webkit-scrollbar-thumb:hover { background-color: rgb(113 113 122); } body::-webkit-scrollbar-thumb { background-color: rgb(82 82 91); } body::-webkit-scrollbar-thumb:hover { background-color: rgb(113 113 122); } ::-webkit-scrollbar-corner { background-color: rgb(39 39 42); } </style>

Want a rounded scrollbar thumb? add these styles.

::-webkit-scrollbar-thumb { border-radius: 0.25rem; border-radius: 9999px; } body::-webkit-scrollbar-thumb { border-radius: 0.25rem; border-radius: 9999px; }

This makes a very nice looking default darkmode scrollbar.

Its sad that this is not the accepted answer.

Before deploying to cloudflare pages with wrangler you need a cloudflare api token. You can get one at dash.cloudflare.com/profile/api-tokens.

Next install wrangler using npm.

npm i -g wrangler

Create a Project #

Before you deploy to cloudflare pages you need to create a project. You might already have one, or you might want to create one in the webui, but you have the option to create it at the command line with wrangler.

npx wrangler pages deploy markout --project-name reader-waylonwalker-com --branch markout

Deploy #

Now you can deploy your static application using wrangler to cloudflare pages.

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