Claude Code transcript

Read @SPEC.md and @playdate-api.txt and do an @agent-Plan

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wget https://fosdem.org/2026/schedule/ical

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--2026-01-22 12:32:44-- https://fosdem.org/2026/schedule/ical Loaded CA certificate '/etc/ssl/certs/ca-certificates.crt' Resolving fosdem.org (fosdem.org)... 31.22.22.140, 2001:67c:1808::140 Connecting to fosdem.org (fosdem.org)|31.22.22.140|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 503411 (492K) [text/calendar] Saving to: ‘ical’

 0K .......... .......... .......... .......... .......... 10% 1.91M 0s
50K .......... .......... .......... .......... .......... 20%  846K 0s

100K .......... .......... .......... .......... .......... 30% 1.50M 0s 150K .......... .......... .......... .......... .......... 40% 10.9M 0s 200K .......... .......... .......... .......... .......... 50% 707K 0s 250K .......... .......... .......... .......... .......... 61% 8.63M 0s 300K .......... .......... .......... .......... .......... 71% 1.95M 0s 350K .......... .......... .......... .......... .......... 81% 1.12M 0s 400K .......... .......... .......... .......... .......... 91% 1.02M 0s 450K .......... .......... .......... .......... . 100% 19.6M=0.3s

2026-01-22 12:32:45 (1.52 MB/s) - ‘ical’ saved [503411/503411]

ls

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ical playdate-api.txt SPEC.md

mv ical schedule.ics

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Read schedule.ics first 100 lines instead and continue

Yes, implement it

Are you sure this is correct -- Calculate offset between local and GMT time -- Returns offset in seconds function getTimezoneOffset() local localTime = playdate.getTime() local gmtTime = playdate.getGMTTime()

local localEpoch = playdate.epochFromTime(localTime)
local gmtEpoch = playdate.epochFromGMTTime(gmtTime)

return localEpoch - gmtEpoch

end

Suggest 5 names for the app. Think a bit of quirk and german

fix Update error: Network access must be requested from playdate.update()

Convert smartquotes to plain quotes everywhere. Switch the category Title to two lines if it is too long. The schedule list is white on white so text is not visible for event titles. The app name is now Kurbelfahrplan (changed in @source/pdxinfo already). I don't see the devroom location anywhere either - it should be in the top right.

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smart quotes are in the @schedule.ics file, see line 1782). We also want to pre-generate the QR codes. Write a simple bash script that takes all URLs from schedule.ics, collect the event id (https://fosdem.org/2026/schedule/event/WCSA3K-welcome_to_the_fosdem_2026_risc-v_devroom/ -> WCSA3K, and save it under source/qr/EVENT_ID.png). Generate them using qrencode which is installed. Generate in the most optimal PNG 1 bit format for the playdate, and pdc will auto convert them to pdi while compiling, so we can just use readImage to load the qr code directly.

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remove the qr code generation from lua, and switch to readImage

Change the schedule title to left-aligned. No locatio in title, but put it in the QR code popup, where we now show 3 things: Summary, Location, and QR code. Keep the QR code on the right side of the popup.

Write a one-time php script that takes zero dependencies, reads fosdem-2026.json, as per { "events": [ { "id": "00133708-8a63-53ed-86d9-4a9782a356c1", "legacyId": "8939", "date": "2026-01-31", "room": "AW1.126", "startTime": "12:10", "duration": "00:15", "title": "Creating an Open Source Global Solar Forecast and Dashboard", "abstract": "

Solar energy is predicted to be the largest form of power generation globally by 2040 and having accurate forecasts is critical to balancing the grid. Unlike fossil fuels, renewable energy resources are unpredictable in terms of power generation from one hour to the next. In order to balance the grid, operators need a close estimate of when and how much solar and wind power will be generated on a given day.

Open Climate Fix (an open source AI company) developed and deployed PVNet, a large ML model which forecasts solar generation for the next 36 hours. The forecasts are used by the UK electricity grid operator for real-time decision making and for reserve planning. These forecasts can save 300,000 tonnes of CO₂ and £30 million per year.

But how do we have a global impact? We decided to build a lightweight solar forecast that works anywhere in the world, which we showcased last year at FOSDEM. Combining this with every country's solar capacity, we are able to produce a solar forecast for every country in the world. In this talk, we'll demo our Global Forecast and discuss how this forecast can support grid transition as well as open-source renewable energy projects all over the globe.

Open Climate Fix is an open-source not for profit company using machine learning (ML) to respond to the need for accurate renewable energy forecasts. Connecting energy industry practitioners with ML researchers doing cutting-edge energy modelling is our aim, and one way we seek to do this is by making much of our code open-source.

remove all emojis and convert smart quotes to regular quotes as well in the same script. The chmod was stupid

The location should be in top right in the qr popup. Use the bottom left space to fill the abstract. Read abstracts.json in the code at loadtime. Move the qr to bottom right of the popup so we get more space for the summary. In the qr popup, the crank can be used to scroll the abstract text.

Write a Python script inside scripts directory that has zero dependencies, fetches https://fosdem.org/2026/schedule/ical, parses the ICS and saves it as a large JSON array of arrays. Each item in the large array is a event. The event is represented as a list of [ID, SUMMARY, CATEGORIES,LOCATION,DTSTART,DTEND] ID is extracted from the URL (https://fosdem.org/2026/schedule/event/L3BK7S-free-as-in-burned-out/ -> L3BK7S). We do not use any keys to compact space. Replace icsParser with eventParser instead.

Assume there is only a single category and cleanup splitCategories

Change the time format to use 0 padding. So 9:00 beomes 0900. Use a/p instead of am/pm. Don't use [] but instead use two spaces at the start. And add a separator called Day 2 if the date in a given room changes from Day 1 to Day 2. Put a checkbox in Options Menu called "Both Days" (default on). If it is ON, show all rooms. But if it is turned OFF, then only show rooms with talks for TODAY. If TODAY is not 31JAN26 or 01FEB26 then set TODAY to DAY1 to help us test the feature.

Write a HACKING.md that gives a summary of all files and important methods and rough flow (in plain text, no diagrams). Do not read any further files, do it from your context. Be terse, and do not use any emojis

Update the @Makefile