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CyberShadow · 2026-05-23T11:10:01

Kernel panic.

CyberShadow · 2026-05-13T18:18:35

No, I think I'm seeing the same bug. Time seems to sometimes subjectively freeze:

    ─── Messages ───                                                                                                                                                                                                              
      Old man shuts the gate behind you. You hear him mutter "every time, I swear..."                                                                                                                                              
      You must retrieve the Amulet of Lost Semicolons.                                                                                                                                                                             
      You kill the rat! (sneak attack!)                                                                                                                                                                                            
      The rat squeals and dies!                                                                                                                                                                                                    
      You wait. (x10)                                                                                                                                 ᛜ                                                                            
    ᚢ You kill the rat! (sneak attack!)                                                             ᛉ                                                                                                                              
      The rat squeals and dies!                                                                                                                                                                                                    
      You hear muttering.                                                  ᛋ                                                                                                                                                       
      You hear muttering.                                                                                                                                                                                                          
      You hear muttering.                                                                                                                                                                                                          
      You hear a distant creak.                                                                                                                       ᛖ                                                     ᛃ                      
      The runestone crumbles as you touch it. You learn: ᛟ means "ice"!                                               ᛚ                                                                                                            
      You hear a distant creak.                                                                                                                                                                                                    
      The goblin misses you. (x3)                                                                                                                                                                                                  
      The goblin hits you for 4.                                                                                                                                                                                                   
      The goblin hits you for 3.                                                                                                           ᛏ                                                                                       
      The goblin hits you for 4.                                                                                                                                                                                                   
      The goblin hits you for 3.                                                                                                                                                                                                   
      The goblin misses you.                                                                                                 ᛚ                                                                                                     
      The goblin hits you for 4.                                                                                                                                                                                                   
      The goblin hits you for 2.                                                                                                                                                                                                   
      The goblin hits you for 4.                                                                                                                                                                                                   
      The goblin misses you.                                                                                                                                                                                                       
      The goblin hits you for 2.                                                                                                                                                                                                   
      The goblin misses you. (x2)                                                                                                                                                                                                  
      The goblin hits you for 2.                                                                                                                                                                                                   
      The goblin kills you!                                                                                                                                                                                                        
      You die...

Note how there were no user action messages during the time the goblin was attacking.

marcingas · 2026-05-13T18:24:01

Definitely a bug. I'll look into this at some point. Please note that this is not a finished game by any means. If anyone asked I'd call it a tech demo at this point :)

CyberShadow · 2026-05-13T19:03:32

Seems to be that the sort function accepts a ternary predicate but then passes it to an implementation accepting a boolean one?

marcingas · 2026-05-13T19:37:13

Yeah that was it, the let-go stdlib changed.

dpkp · 2026-05-13T19:28:51

I see the same but only in browser / wasm. Also notice that the mobs dont move in browser mode. Local via lg in console works great though.

fhn · 2026-05-13T18:21:35

yeah. something is wrong. You don't even get to fight back.

marcingas · 2026-05-13T19:25:59

I think I fixed it!

CyberShadow · 2026-04-27T01:32:18

Same, I've added a .#screenshots derivation. High up-front effort but almost zero maintenance afterwards.

Bonus: since you're generating screenshots programmatically anyway, you can generate a pair of each with your app's light/dark theme, and swap them in/out depending on prefers-color-scheme: dark. <picture> elements work in GitHub READMEs, too: https://github.com/CyberShadow/CyDo#readme

neobrain · 2026-04-27T07:59:09

+1 for this approach. For a mobile app, I made Nix spawn an ephemeral Android emulator instance for generating up-to-date screenshots, requiring no prior setup and leaving no lingering data around after running. Setting it up wasn't that high-effort in my case either; coming up with the idea was the hard part, the Nix code was one-shot by your favorite LLM.

Granted manually updating the screenshots isn't the most laborious task in the world, but the "upload-apk + take-screenshot + transfer-back-to-PC + edit" process is usually barely annoying enough that you end up almost never doing it otherwise (similar to the OP's experience in the closing paragraph).

Landing7610 · 2026-04-28T17:36:05

That sounds so cool! Is the repo available anywhere?

neobrain · 2026-05-03T17:05:24

Nothing public yet, but this is the Nix output for taking the screenshot, to be executed via `nix run .#screenshot`:

        outputs.apps.x86_64.screenshot = {
          type = "app";
          program = toString (pkgs.writeShellScript "screenshot-script" ''
            set -euo pipefail

            EMU_SDK="${androidEmulatorComposition.androidsdk}/libexec/android-sdk"
            ADB="$EMU_SDK/platform-tools/adb"
            EMULATOR="$EMU_SDK/emulator/emulator"
            APK="${self.packages.${system}.debug}/myapp-debug.apk"

            SRC_DIR="$(${pkgs.git}/bin/git rev-parse --show-toplevel)"
            AVD_HOME="$(mktemp -d)"
            trap 'kill "$EMU_PID" 2>/dev/null; wait "$EMU_PID" 2>/dev/null; rm -rf "$AVD_HOME"' EXIT

            # Create AVD
            AVD_DIR="$AVD_HOME/screenshot.avd"
            mkdir -p "$AVD_DIR"
            cat > "$AVD_HOME/screenshot.ini" <<EOF
            avd.ini.encoding=UTF-8
            path=$AVD_DIR
            target=android-${platformVersion}
            EOF
            cat > "$AVD_DIR/config.ini" <<EOF
            AvdId=screenshot
            PlayStore.enabled=false
            abi.type=x86_64
            avd.ini.encoding=UTF-8
            hw.cpu.arch=x86_64
            hw.gpu.enabled=yes
            hw.gpu.mode=swiftshader_indirect
            hw.lcd.density=420
            hw.lcd.height=2400
            hw.lcd.width=1080
            hw.ramSize=2048
            image.sysdir.1=system-images/android-${platformVersion}/google_apis/x86_64/
            skin.dynamic=yes
            tag.display=Google APIs
            tag.id=google_apis
            disk.dataPartition.size=2G
            EOF

            echo "==> Starting emulator..."
            ANDROID_AVD_HOME="$AVD_HOME" ANDROID_HOME="$EMU_SDK" \
              "$EMULATOR" -avd screenshot -no-window -no-audio -no-boot-anim \
              -gpu swiftshader_indirect -no-snapshot 2>&1 &
            EMU_PID=$!

            echo "==> Waiting for boot..."
            for i in $(seq 1 90); do
              BOOT=$("$ADB" shell getprop sys.boot_completed 2>/dev/null | tr -d '\r') || true
              if [ "$BOOT" = "1" ]; then
                echo "    Booted after ~$((i * 2))s"
                break
              fi
              sleep 2
            done
            if [ "$BOOT" != "1" ]; then
              echo "ERROR: Emulator failed to boot" >&2
              exit 1
            fi

            # Enable dark mode
            "$ADB" shell cmd uimode night yes

            # Install and launch
            echo "==> Installing APK..."
            "$ADB" install -r "$APK"
            "$ADB" shell pm grant com.me.myapp android.permission.WRITE_SECURE_SETTINGS
            "$ADB" shell am start -n com.me.myapp/.MainActivity
            sleep 3

            # Navigate to settings screen by tapping "Notification Filters" button
            # This uses uiautomator to find the button by text for robustness
            "$ADB" shell uiautomator dump /sdcard/ui.xml
            BOUNDS=$("$ADB" shell cat /sdcard/ui.xml \
              | ${pkgs.gnugrep}/bin/grep -oP 'text="Notification Filters"[^>]*bounds="\K[^"]+' \
              || true)
            if [ -z "$BOUNDS" ]; then
              echo "ERROR: Could not find Notification Filters button" >&2
              exit 1
            fi
            # Parse bounds "[x1,y1][x2,y2]" to compute center tap coordinates
            X1=$(echo "$BOUNDS" | ${pkgs.gnused}/bin/sed 's/\[\([0-9]*\),\([0-9]*\)\]\[\([0-9]*\),\([0-9]*\)\]/\1/')
            Y1=$(echo "$BOUNDS" | ${pkgs.gnused}/bin/sed 's/\[\([0-9]*\),\([0-9]*\)\]\[\([0-9]*\),\([0-9]*\)\]/\2/')
            X2=$(echo "$BOUNDS" | ${pkgs.gnused}/bin/sed 's/\[\([0-9]*\),\([0-9]*\)\]\[\([0-9]*\),\([0-9]*\)\]/\3/')
            Y2=$(echo "$BOUNDS" | ${pkgs.gnused}/bin/sed 's/\[\([0-9]*\),\([0-9]*\)\]\[\([0-9]*\),\([0-9]*\)\]/\4/')
            TAP_X=$(( (X1 + X2) / 2 ))
            TAP_Y=$(( (Y1 + Y2) / 2 ))
            "$ADB" shell input tap "$TAP_X" "$TAP_Y"
            sleep 2

            # Capture and process screenshot
            echo "==> Capturing screenshot..."
            "$ADB" shell screencap -p /sdcard/screenshot.png
            "$ADB" pull /sdcard/screenshot.png "$AVD_HOME/raw.png"

            # Crop to content: remove status bar (top 128px) and empty space below
            # Per-App Overrides, then resize with high-quality Lanczos filter
            ${pkgs.imagemagick}/bin/magick "$AVD_HOME/raw.png" \
              -crop 1080x1100+0+128 +repage \
              -filter Lanczos -resize 540x \
              "$SRC_DIR/fastlane/metadata/android/en-US/images/phoneScreenshots/settings.png"

            echo "==> Screenshot saved to fastlane/metadata/android/en-US/images/phoneScreenshots/settings.png"
          '');
        };

9dev · 2026-04-27T12:30:04

The <picture> in README trick works like magic. Thank you! I'm going to steal it.

CyberShadow · 2026-03-23T07:46:34

If you grant access to the Nix daemon socket but not writing outside the current directory, that's an effective sandbox. It allows evaluating derivations but not actually installing them.

CyberShadow · 2026-03-21T17:25:01

If you invoke Claude Code with --input-format stream-json --output-format stream-json, you can use it headlessly. I built a personal UI / orchestration framework around it. Most features are available, but not exactly all (e.g. there is no way to undo via this protocol, but you can still do it manually by terminating / editing the session file / resuming). Other agentic software has similar features (Codex uses JSON-RPC, Copilot CLI has ACP which is also based on JSON-RPC).

CyberShadow · 2026-01-13T08:49:50

Can you share what made this behavior obvious to you? E.g. when I first saw Open Code, it looked like yet another implementation of Claude Code, Codex-CLI, Gemini-CLI, Project Goose, etc. - all these are TUI apps for agentic coding. However, from these, only Open Code automatically started an unauthenticated web server when I simply started the TUI, so this came as a surprise to me.

CyberShadow · 2026-01-13T07:02:37

> Browsers don't let random pages on the internet hit localhost without prompting you anymore

No, that's a Chrome-specific feature that Google added. It is not part of any standard, and does not exist in other browsers (e.g. Safari and Firefox).

> The rest is just code running as your user can talk to code running as your user

No, that assumes that there is only a single user on the machine, and there are either no forms of isolation or that all forms of isolation also use private network namespaces, which has not been how daemons are isolated in UNIX or by systemd. For example, if you were to ever run OpenCode as root, any local process can trivially gain root as well.

Spivak · 2026-01-13T18:33:02

Huh? I have this permission in Firefox right now. It looks like Safari handles this with the OS local network permission.

True I did assume machines are single user, I haven't seen a shared computer in ages. Doing local development I have insecure/incomplete software listening on localhost all the time while developing it. And lots of people have passwordless sudo, or unprivileged access to the docker socket so protection against local processes running as me is not part of my threat model. And I know this is pretty dev centric but OpenCode is dev centric as well.

CyberShadow · 2026-01-13T20:31:07

Are you on macOS? That might be a feature specific to that OS, I don't think Firefox does that on other OSes.

CyberShadow · 2026-01-11T22:42:36

PSA - please ensure you are running OpenCode v1.1.10 or newer: https://news.ycombinator.com/item?id=46581095

CyberShadow · 2025-11-11T09:22:34

Looks like it's impossible for me to use this service - when I try to submit the form, I get a reCAPTCHA challenge. By the time I complete it (Google requires me to make several attempts, each one being several pages), the page errors out in the background with "reCAPTCHA execution timeout".

lionkor · 2025-11-11T10:34:41

Try solving it slowly, some captchas love that.

CyberShadow · 2025-11-16T19:52:30

I don't think you understand. This website imposes its own time limit within which I must solve the CAPTCHA. Taking your time to solve the challenge slowly will not allow you to proceed, because the website's timeout will have expired.

CyberShadow · on April 20, 2025

How does it compare to CodeGemma for programming tasks?