u/siorge

11 days ago, I released skymap.sh, a plaintext map of the sky above you, available in your browser and in your CLI (and on mobile, but it's not plaintext there)

https://reddit.com/link/1vkq86o/video/66p47o6gtkih1/player

Since then, I worked on polishing the UX and adding coverage for more celestial events and objects (like eclipses and meteo showers), and refining the looks.

Today, I just crossed 10,000 requests handled. Since there is no user account and no tracking, requests is the only metric I have to gauge user interest and interactions.

This is probably insignificant to most, but it means a lot to me and feels like a major first milestone. Wanted to share here :)

https://preview.redd.it/a8r3m0x1ukih1.png?width=1530&format=png&auto=webp&s=57a22b7e956483787171809afa3558dfef521c0b

EDIT: many updates have been pushed since, I hope you enjoy them. I also created r/skymap to centralise all update news and discussions around the product. Join if you care :)

Hi r/commandline,

I wanted to share with you a small command line tool I built (with the assistance of AI - the code is AI-generated) to display a sky map directly in your CLI. No API, no signup, no data. Plain text.

Simply type in your CLI:

curl skymap.sh

Or visit skymap.sh

And you will see a current view of your local sky (day or night). Check it out in the gif below:

https://i.redd.it/pqbode9q3dgh1.gif

​It tracks the Sun, the Moon, the planets, 2'500 important stars as well as the ISS.

Here are the command/parameters you can use:

curl skymap.sh                 # uses your IP location
curl skymap.sh/Tokyo           # any of 40,000+ major cities
curl skymap.sh/47.38,8.54      # raw coordinates
?t=2026-08-12T23:00            # see the sky at any time, past or future
(±2 years)
?view=disc                     # whole sky as a circle, North up, looking
straight up
?facing=NW                     # a 140°-wide window facing one direction,
undistorted shapes
?span=90                       # control how wide the window is (90–344°)
?find=Venus                    # frame one object: a planet, the Moon, a
                                 named star, or a recognizable star pattern
                                 like the "Big Dipper." Tells you where to
                                 look and if it's not up right now, when it
                                 will be up next
?night=1                       # force the star chart even during daylight
                                 (default is the Sun's path across the sky
                                 during the day)
?w=100                         # fit the output to N columns, so it doesn't
                                 wrap in a narrower terminal
?format=json                   # the same facts as structured data instead
                                 of ASCII art
?plain=1                       # no ANSI colors

There is a live demo with real examples at skymap.sh/demo, and you can use curl skymap.sh/help for the full reference.

I have basic dev skills from a previous career and am an astronomy enthusiast, so I figured I would try my hand at building something fun with the help of an AI agent!

I hope this post is suitable for this sub, and importantly, that you like the tool :)

LLMs output millions, maybe billions, of markdown files every single day.

We all create, read, and render these files without much care.

The markdown LLMs generate is a function of everything in their context window: fetched web pages, tool results, other people's messages in a shared thread. None of that is fully under your control, so if a model gets steered (say via indirect prompt injection) into emitting something like <img src=x onerror="...">, and your chat UI or coding-agent webview renders that markdown through innerHTML, that payload runs inside that app with whatever access it has.

Every markdown renderer I checked (marked, markdown-it, showdown) parses to an HTML string, and either passes raw HTML by default or expects you to add a sanitiser on top. This is one more failure point in a hands-off process (agentic coding), and something one might easily forget.

This renderer removes the sink entirely.

render() never produces an HTML string. Instead, it builds a DocumentFragment directly with createElement/createTextNode/setAttribute. No innerHTML anywhere in the call path, so there's nothing for a hostile tag to be parsed into.

You can verify the whole safety property by reading the one file that ever touches the DOM (emit.js, ~400 lines).

One thing it doesn't close on its own: an http/https image URL still gets fetched the instant it renders with no click needed. A model tricked into emitting  can still leak data through the request itself, even with zero script execution.

To fix this, there is a urlFilter hook (host allowlist, or route images through a proxy), but it is opt-in, not automatic.

A few implementation choices were made, to keep this small enough to inline into a single-file web app while keeping the security property intact:

- Not a full CommonMark implementation. 77% of in-scope spec examples pass; an honest breakdown of what's excluded and why is in the README.

- Raw HTML in markdown is escaped to visible text, never rendered. That's not a bug. This is by design.

- No reference-style links, no entity decoding, no indented code blocks (fenced only).

- Emphasis uses a simpler rule than CommonMark's full delimiter-run algorithm, which is a meaningful chunk of a complete parser's size by itself.

Zero dependencies. ~13 KB minified, ~4.8 KB gzipped.

Demo: https://habibicodech.github.io/safe-markdown/
Repo: https://github.com/HabibiCodeCH/safe-markdown

For real, what’s going on here? For the past week all I’m seeing is rennet.

I've been using Claude Code a ton these past few months and got curious how much I was actually burning through, so I built a little tool that turns your usage into an itemized paper receipt — tokens burned, longest streak, your coding "archetype" (Midnight Refactorer, Weekend Warrior, etc.), how many times you've insulted Claude, and a real $ estimate (based on model used and price per token - not on your subscription)

Everything is computed locally by reading your own ~/.claude/projects session logs — no code, no prompts, nothing ever leaves your machine unless you explicitly opt in to publish just the final numbers (aggregates) for a shareable card.

Just run in in your CLI using the following command:

npx vibe-code-receipts

Takes about 10 seconds, no install, no signup required.

vibecodereceipts.com

My main learning from this project was on bug handling. Many times, Claude was unable to produce the proper visual or perform the calculations as I wanted to. At first, I was trying to rephrase the bug, be more precise, maybe add more screenshots.

I realised that in many cases, telling Claude to start from scratch, or suggesting something I thought might be stupid (replace on-the-fly SVG tracing with a static image) was actually the right move.

So I guess, don't go burning thousands of tokens pushing Claude to solve bugs if you have an intuition. Ask Claude to investigate your idea, it might just work!

I hope this isn't against the rules, but I created this website (thecostofbeef.org) to raise awareness about the damages caused by beef consumption on the environment and the animals.

It is extremely simple, but I wanted it impactful and easy to grasp.

All feedback is welcome.

Of course, no data is collected, no cookies, nothing.

1714 CET: Pushed an update to add a more visual representation

Hi all,

I created this website: thecostofbeef.org to promote awareness of the environmental and ethical impacts of beef consumption.

Would love some feedback from you, as this is an issue that is dear to me.

Site doesn't collect any data or information. I hope this isn't against the rules.

1714 CET: Pushed an update to add a more visual representation

I hope this isn't against the rules, but I created this website (thecostofbeef.org) to raise awareness about the damages caused by beef consumption on the environment and the animals.

It is extremely simple, but I wanted it impactful and easy to grasp.

All feedback is welcome.

Of course, no data is collected, no cookies, nothing.

1714 CET: Pushed an update to add a more visual representation

I don't know about you, but I am a big YT user.

Whenever I learn of something new, my first reflexes are always: read wikipedia, and check youtube for a documentary/vlog...

To make this easier, I coded "Tube Me That"

The extension takes either the page name or your highlighted text, opens a menu for you to add some filters, and then searches YT according to your criteria.

One shortcut to YT.

https://chromewebstore.google.com/detail/tube-me-that/glnlgdlimpcmphnaipbmbkojbnhekgfn?authuser=1&hl=en

What do you think?

https://reddit.com/link/1ubnu4m/video/q8r2epdxgm8h1/player

Hi Sub,

This is my first post in here, as I just got my first extension published on the store.

It is called "How Musk is that?" and it will show you what every USD amount represents as a share of Elon Musk's fortune.

https://preview.redd.it/ml5gbqro988h1.png?width=1280&format=png&auto=webp&s=24f1e4b277df2962293f60ab9237be2d2effe8d5

This is a "just for fun" extension I wanted to share.

Of course, no data collected, no permission, no tracking, 100% ad-free.

You can find it here

I'd love your feedback!