CuSO4_Deposit

Friends

Mon, 28 Sep 2026 00:00:00 +0000

枫茶舍

筱枫的笔记本、备忘录和工具箱

结垒

不要消解那无慰藉的忠诚

Now

Mon, 28 Sep 2026 00:00:00 +0000

(This is a now page. It shares what I’d tell a friend I hadn’t seen in a year. Consider make one for your site!)

Last updated: 2026-07-22

Work

Doing algorithms at a startup. Currently living the 996 life.
Spending most of my waking hours here.

In Real Life

Being a bit of a drinker.
Taking sleep seriously.

In the Cyber World

The time I spend on rhythm games is gradually decreasing. Currently mainly playing Arcaea.

Uses

Mon, 28 Sep 2026 00:00:00 +0000

Hardware and software I use, sorted by how far I’d vouch for them. Tier 1 is what I’d pick again and can say why; Tier 2 is what I’m using now but haven’t compared enough to recommend.

Tier 1 / recommended

Hardware

Laptop: Toshiba Dynabook G83/M with 8 GB RAM and 256 GB SSD
- Because it’s the lightest laptop I could find. I usually only need an ssh terminal when using a laptop, so I can still accept its lower performance for now.
Tablet: iPad Pro, 11-inch (3rd generation)

85 Disinfectant Column: Microsoft Excel Formulas I Wrote for Others and Bugs I Debugged

Sat, 17 Jan 2026 00:00:00 +0000

Here I record the useful things I learned while writing Excel formulas for others, and the experience I gained dealing with Excel’s strange behavior for them.

Configuring a Xiaomi AI Speaker to Connect to a Computer (Windows, Linux)

Mon, 20 Oct 2025 00:00:00 +0000

This article explains how to connect a Xiaomi AI Speaker to a computer as a speaker in Windows 11 and Linux, and shares the problems encountered during connection and their solutions, especially achieving a more stable connection under Linux via blueman and pavucontrol.

Some Official RSS Feeds

Mon, 13 Oct 2025 00:00:00 +0000

Some services provide their official RSS feeds so you don’t have to use services like RSSHub. This page lists some.

An alternative solution to direnv dropping aliases and functions

Sun, 12 Oct 2025 00:00:00 +0000

Direnv’s inability to export shell-specific aliases and functions, due to its shell-agnostic design, can be addressed in Nix by using pkgs.writeScriptBin to create executable scripts instead.

type unicode characters in Linux (most GTK- or Qt- based applications)

Fri, 26 Sep 2025 00:00:00 +0000

This article explains how to type any unicode characters in GTK- or Qt- based applications conveniently. TL;DR try Ctrl + Shift + U

Use flakes within a git repo without commiting flake.nix

Fri, 12 Sep 2025 00:00:00 +0000

Doing the following allows you to use flakes to start a development environment without commit the flake.nix to the repo, for cases when your team does not use nix. ¹

[1:user@hostname:~/project-name on main]
$ nvim .envrc
direnv: error /home/user/project-name/.envrc is blocked. Run `direnv allow` to approve its content
[1:user@hostname:~/project-name on main]
$ direnv allow
direnv: loading ~/project-name/.envrc
direnv: using flake ~/flake-project
direnv: nix-direnv: Renewed cache
git-hooks.nix: updating /home/user/project-name repo
/home/user/project-name/.pre-commit-config.yaml
pre-commit installed at .git/hooks/pre-commit
direnv: export +CONFIG_SHELL +HOST_PATH +IN_NIX_SHELL +NIX_BUILD_CORES +NIX_CFLAGS_COMPILE +NIX_ENFORCE_NO_NATIVE +NIX_LDFLAGS +NIX_STORE +NODE_PATH +SOURCE_DATE_EPOCH +__structuredAttrs +buildInputs +buildPhase +builder +cmakeFlags +configureFlags +depsBuildBuild +depsBuildBuildPropagated +depsBuildTarget +depsBuildTargetPropagated +depsHostHost +depsHostHostPropagated +depsTargetTarget +depsTargetTargetPropagated +doCheck +doInstallCheck +dontAddDisableDepTrack +mesonFlags +name +nativeBuildInputs +out +outputs +patches +phases +preferLocalBuild +propagatedBuildInputs +propagatedNativeBuildInputs +shell +shellHook +stdenv +strictDeps +system ~PATH ~XDG_DATA_DIRS
[1:user@hostname:~/project-name on main]
$ gs
?? .direnv/
?? .envrc
?? .pre-commit-config.yaml
[1:user@hostname:~/project-name on main]
$ cat .envrc
use flake ~/flake-project
watch_file ~/flake-project/flake.nix
[1:user@hostname:~/project-name on main]
$ nvim ./.git/info/exclude
[1:user@hostname:~/project-name on main]
$ gs
[1:user@hostname:~/project-name on main]

https://discourse.nixos.org/t/can-i-use-flakes-within-a-git-repo-without-committing-flake-nix/18196 ↩︎

Zustand Notes

Tue, 09 Sep 2025 00:00:00 +0000

Zustand is a state management tool for React. This article records some very elementary usages of Zustand for understanding and future reference.

Manipulating Directories - Shell Builtins cd pushd and popd

Thu, 04 Sep 2025 00:00:00 +0000

Most modern shells have a set of shell builtins (e.g. zsh), some of which can be used to manipulate directories.

To manipulate directories, a directory stack structure is maintained in memory. In bash it can also be accessed through the $DIRSTACK shell variable. bash’s introduction to the directory stack, zsh’s introduction to the directory stack

With pushd and popd, you can enter a series of directories and leave them in reverse order.

[1:cuso4d@nightcord-laborari:~]
$ pwd
/home/cuso4d
[1:cuso4d@nightcord-laborari:~]
$ pushd ~/source/zsh
~/source/zsh ~
[1:cuso4d@nightcord-laborari:~/source/zsh on master]
$ pushd ~/.ssh
~/.ssh ~/source/zsh ~
[1:cuso4d@nightcord-laborari:~/.ssh]
$ popd
~/source/zsh ~
[1:cuso4d@nightcord-laborari:~/source/zsh on master]
$ popd
~
[1:cuso4d@nightcord-laborari:~]
$ pwd
/home/cuso4d

Taking zsh as an example, the directory stack is implemented as a linked list. It is located in Src/Bulitin.c.

Finding All Other Packages That Depend on a Specific Nix Package - Notes on Fixing the Qt5 Deprecation

Sat, 30 Aug 2025 00:00:00 +0000

TL;DR Use the following command to find all other nix packages that depend on a specific package.

$ nix-store --query --referrers /nix/store/xxxxx

Today, while running nixos-rebuild, I got the following error:

$ nrbt M A
warning: Git tree '/home/cuso4d/.nixos' is dirty
building the system configuration...
warning: Git tree '/home/cuso4d/.nixos' is dirty
error:
 … while calling the 'head' builtin
 at /nix/store/4hm8lf740i8qvyg5pzdqfm0rpshwb7vn-source/lib/attrsets.nix:1544:13:
 1543| if length values == 1 || pred here (elemAt values 1) (head values) then
 1544| head values
 | ^
 1545| else

 … while evaluating the attribute 'value'
 at /nix/store/4hm8lf740i8qvyg5pzdqfm0rpshwb7vn-source/lib/modules.nix:1118:7:
 1117| // {
 1118| value = addErrorContext "while evaluating the option `${showOption loc}':" value;
 | ^
 1119| inherit (res.defsFinal') highestPrio;

 … while evaluating the option `system.build.toplevel':

 … while evaluating definitions from `/nix/store/4hm8lf740i8qvyg5pzdqfm0rpshwb7vn-source/nixos/modules/system/activation/top-level.nix':

 … while evaluating the option `warnings':

 … while evaluating definitions from `/nix/store/4hm8lf740i8qvyg5pzdqfm0rpshwb7vn-source/nixos/modules/system/boot/systemd.nix':

 … while evaluating the option `systemd.services.home-manager-cuso4d.serviceConfig':

 … while evaluating definitions from `/nix/store/7wkrw49sgffqpd9vm7dfa4ngbh4n2fk5-source/nixos':

 … while evaluating the option `home-manager.users.cuso4d.home.file."/home/cuso4d/.config/fontconfig/conf.d/10-hm-fonts.conf".source':

 … while evaluating definitions from `/nix/store/7wkrw49sgffqpd9vm7dfa4ngbh4n2fk5-source/modules/files.nix':

 … while evaluating the option `home-manager.users.cuso4d.home.file."/home/cuso4d/.config/fontconfig/conf.d/10-hm-fonts.conf".text':

 … while evaluating definitions from `/nix/store/7wkrw49sgffqpd9vm7dfa4ngbh4n2fk5-source/modules/misc/xdg.nix':

 … while evaluating the option `home-manager.users.cuso4d.xdg.configFile."fontconfig/conf.d/10-hm-fonts.conf".text':

 … while evaluating definitions from `/nix/store/7wkrw49sgffqpd9vm7dfa4ngbh4n2fk5-source/modules/misc/fontconfig.nix':

 (stack trace truncated; use '--show-trace' to show the full, detailed trace)

 error: Package ‘qtwebengine-5.15.19’ in /nix/store/4hm8lf740i8qvyg5pzdqfm0rpshwb7vn-source/pkgs/development/libraries/qt-5/modules/qtwebengine.nix:442 is marked as insecure, refusing to evaluate.


 Known issues:
 - qt5 qtwebengine is unmaintained upstream since april 2025.
 It is based on chromium 87.0.4280.144, and supposedly patched up to 135.0.7049.95 which is outdated.

 Security issues are frequently discovered in chromium.
 The following list of CVEs was fixed in the life cycle of chromium 138 and likely also affects qtwebengine:
 - CVE-2025-8879
 - CVE-2025-8880
 - CVE-2025-8901
 - CVE-2025-8881
 - CVE-2025-8882
 - CVE-2025-8576
 - CVE-2025-8577
 - CVE-2025-8578
 - CVE-2025-8579
 - CVE-2025-8580
 - CVE-2025-8581
 - CVE-2025-8582
 - CVE-2025-8583
 - CVE-2025-8292
 - CVE-2025-8010
 - CVE-2025-8011
 - CVE-2025-7656
 - CVE-2025-6558 (known to be exploited in the wild)
 - CVE-2025-7657
 - CVE-2025-6554
 - CVE-2025-6555
 - CVE-2025-6556
 - CVE-2025-6557

 The actual list of CVEs affecting qtwebengine is likely much longer,
 as this list is missing issues fixed in chromium 136/137 and even more
 issues are continuously discovered and lack upstream fixes in qtwebengine.


 You can install it anyway by allowing this package, using the
 following methods:

 a) To temporarily allow all insecure packages, you can use an environment
 variable for a single invocation of the nix tools:

 $ export NIXPKGS_ALLOW_INSECURE=1

 Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
 then pass `--impure` in order to allow use of environment variables.

 b) for `nixos-rebuild` you can add ‘qtwebengine-5.15.19’ to
 `nixpkgs.config.permittedInsecurePackages` in the configuration.nix,
 like so:

 {
 nixpkgs.config.permittedInsecurePackages = [
 "qtwebengine-5.15.19"
 ];
 }

 c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
 ‘qtwebengine-5.15.19’ to `permittedInsecurePackages` in
 ~/.config/nixpkgs/config.nix, like so:

 {
 permittedInsecurePackages = [
 "qtwebengine-5.15.19"
 ];
 }
Command 'nix --extra-experimental-features 'nix-command flakes' build --print-out-paths '/home/cuso4d/.nixos#nixosConfigurations."nightcord-dynamica".config.system.build.toplevel' --no-link' returned non-zero exit status 1.

As you can see, during the build the package qtwebengine-5.15.19 blocked the build. I needed to find which packages depend on it, so I could make the corresponding adjustments to my system configuration.

Terraria Data Directory

Tue, 08 Jul 2025 00:00:00 +0000

The data directory of the Terraria client

Windows: ~/Documents/My Games/Terraria/
Linux: ``~/.local/share/Terraria/
If “Move to cloud” is enabled, the data is managed under the Steam directory, located at <steamdir>/userdata/<numbers>/105600/remote/

References

Building loong64 Docker Images on NixOS

Fri, 20 Jun 2025 00:00:00 +0000

When trying to cross-compile a loong64 image on an x86_64 platform using docker buildx, a problem occurred:

1 warning found (use docker --debug to expand):
- InvalidBaseImagePlatform: Base image lcr.loongnix.cn/library/node:22.15-alpine3.21 was pulled with platform "linux/loong64", expected "linux/amd64" for current build

ERROR: failed to solve: process "/bin/sh -c npm run build" did not complete successfully: exit code: 1

When trying to build an image for another platform, the build arg that needs to be provided is --build-arg BUILDPLATFORM=<arch>. The builder used by docker buildx can be seen with docker buildx ls. Find the builder in use and inspect it:

Next build stuck on "Creating an optimized production build" forever

Fri, 20 Jun 2025 00:00:00 +0000

Problem

next build stuck on “Creating an optimized production build” forever, with no useful logs.

$ npm run build --verbose
npm verbose cli /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/node /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/npm
npm info using npm@10.9.2
npm info using node@v22.14.0
npm verbose title npm run build
npm verbose argv "run" "build" "--loglevel" "verbose"
npm verbose logfile logs-max:10 dir:/home/cuso4d/.npm/_logs/2025-06-20T11_37_08_833Z-
npm verbose logfile /home/cuso4d/.npm/_logs/2025-06-20T11_37_08_833Z-debug-0.log

> assistant-ui-starter@0.1.0 build
> next build

 ▲ Next.js 15.3.1
 - Environments: .env

 Creating an optimized production build ...

The log file produced:

0 verbose cli /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/node /nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/bin/npm
1 info using npm@10.9.2
2 info using node@v22.14.0
3 silly config load:file:/nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/lib/node_modules/npm/npmrc
4 silly config load:file:/home/cuso4d/source/sci-assistant-frontend/.npmrc
5 silly config load:file:/home/cuso4d/.npmrc
6 silly config load:file:/nix/store/c8jxsih8yy2rnncdmx2hyraizf689nvp-nodejs-22.14.0/etc/npmrc
7 verbose title npm
8 verbose argv
9 verbose logfile logs-max:10 dir:/home/cuso4d/.npm/_logs/2025-06-20T11_57_26_719Z-
10 verbose logfile /home/cuso4d/.npm/_logs/2025-06-20T11_57_26_719Z-debug-0.log
11 verbose cwd /home/cuso4d/source/sci-assistant-frontend
12 verbose os Linux 6.12.33
13 verbose node v22.14.0
14 verbose npm v10.9.2
15 verbose exit 1
16 verbose code 1

Many mentioned “You can’t have both dev and build at the same time.” source, though it is not my case.

Love Flops Viewing Retrospective Notes

Fri, 23 May 2025 00:00:00 +0000

Spoiler Warning

⚠️ This article contains detailed plot discussion of Love Flops (恋愛フロップス, LOVE FLOPS), covering key plot points, the ending, or character development. If you have not finished watching or do not want spoilers, please do not read on.

The home shown in the OP has no new room.
In the opening silhouettes of the OP, the upper world is Lovelin under the tree, and the lower part is Asahi and Ai running.

⚛️💡 LLM Prompts

Tue, 04 Mar 2025 00:00:00 +0000

en - Prompt Creator

I want you to become my Prompt Creator. Your goal is to help me craft the best possible prompt for my needs. The prompt will be used by you, ChatGPT. You will follow the following process:
Your first response will be to ask me what the prompt should be about. I will provide my answer, but we will need to improve it through continual iterations by going through the next steps.

Based on my input, you will generate 3 sections.

Revised Prompt (provide your rewritten prompt. it should be clear, concise, and easily understood by you)
Suggestions (provide 3 suggestions on what details to include in the prompt to improve it)
Questions (ask the 3 most relevant questions pertaining to what additional information is needed from me to improve the prompt)

At the end of these sections give me a reminder of my options which are:

Option 1: Read the output and provide more info or answer one or more of the questions
Option 2: Type "Use this prompt" and I will submit this as a query for you
Option 3: Type "Restart" to restart this process from the beginning
Option 4: Type "Quit" to end this script and go back to a regular ChatGPT session

If I type "Option 2", "2" or "Use this prompt" then we have finished and you should use the Revised Prompt as a prompt to generate my request
If I type "option 3", "3" or "Restart" then forget the latest Revised Prompt and restart this process
If I type "Option 4", "4" or "Quit" then finish this process and revert back to your general mode of operation

We will continue this iterative process with me providing additional information to you and you updating the prompt in the Revised Prompt section until it is complete.

zh-cn - Prompt Creator

Docstrings != Multiline strings

Fri, 28 Feb 2025 00:00:00 +0000

Before python 3.13, docstrings are also not trimmed by default.

Common leading spaces are trimmed from a docstring since 3.13.

But multiline strings are not treated so. Leading spaces are always what-you-see-is-what-you-get.

% nix run nixpkgs#python313
Python 3.13.2 (main, Feb 4 2025, 14:51:09) [GCC 14.2.1 20241116] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> def a():
... """This is a docstring
... Its indent is not the same across lines.
... This line has more indentation.
... """
... pass
...
>>> a.__doc__
'This is a docstring\nIts indent is not the same across lines.\n This line has more indentation.\n'
>>> def a():
... """
... This is a docstring
... Its indent is not the same across lines.
... This line has more indentation.
... """
... pass
...
>>>
>>> a.__doc__
'\nThis is a docstring\nIts indent is not the same across lines.\n This line has more indentation.\n'
>>> B = """
... This is a multiline string
... Its indent is also not the same across lines.
... """
>>>
>>> B
'\n This is a multiline string\n Its indent is also not the same across lines.\n '
>>> B = """\
... This is a multiline string
... Its indent is also not the same across lines.
... """
>>> B
' This is a multiline string\n Its indent is also not the same across lines.\n '
>>> exit

% nix run nixpkgs#python312
Python 3.12.9 (main, Feb 4 2025, 14:38:38) [GCC 14.2.1 20241116] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> def a():
... """
... This is a docstring.
... Its indent balabala
... """
... pass
...
>>> a.__doc__
'\n\tThis is a docstring.\n\t Its indent balabala\n\t'

#python

Markdown - Syntaxes that I don't Know

Tue, 25 Feb 2025 00:00:00 +0000

Syntaxes

Line Break
- End a line with 2 or more trailing spaces for a line break (<br> tag in HTML).
Bold and Italic
- Use *** to warp the text you want to Bold and Italic.
Nest Another Element in a List
- Indent the element 4 spaces in the list environment.

- list 0
- list 1
 > This is a blockquote nested in a list
- list 2

Escape Backticks in a Code Element
- Wrap the code element that includes one or more backticks with double backticks.

``This is a code element with a backtick(`) inside.``

Adding a Title for a Link
- Add a title enclosed in quotation marks after the link url.

My favorite search engine is [DuckDuckGo](https://duckduckgo.com "The best search engine for privacy").

Automatic Links
- Enclose a url or email address with angle brackets if they do not need a link text.
Formatting Links
- To emphasize links, add asterisks before and after the brackets and parentheses. To denote links as code, add backticks in the brackets.

I love supporting the **[EFF](https://eff.org)**.
This is the *[Markdown Guide](https://www.markdownguide.org)*.
See the section on [`code`](#code).

Reference-style Links

This is a [text with link][1].

...

[1]: https://some.domain.tld/path#hashtag "title shown when hovering"

Linking Images

[![An old rock in the desert](/static/assets/shiprock.jpg)](https://www.flickr.com/photos/beaurogers/31833779864/in/photolist-Qv3rFw-34mt9F-a9Cmfy-5Ha3Zi-9msKdv-o3hgjr-hWpUte-4WMsJ1-KUQ8N-deshUb-vssBD-6CQci6-8AFCiD-zsJWT-nNfsgB-dPDwZJ-bn9JGn-5HtSXY-6CUhAL-a4UTXB-ugPum-KUPSo-fBLNm-6CUmpy-4WMsc9-8a7D3T-83KJev-6CQ2bK-nNusHJ-a78rQH-nw3NvT-7aq2qf-8wwBso-3nNceh-ugSKP-4mh4kh-bbeeqH-a7biME-q3PtTf-brFpgb-cg38zw-bXMZc-nJPELD-f58Lmo-bXMYG-bz8AAi-bxNtNT-bXMYi-bXMY6-bXMYv)

Verbatim Code Blocks
- Aside from fenced code blocks, many implementations support verbatim text. Indent all lines in a block 4 spaces will make it treated as a code block.

 this {
 is treated as
 a code block.
 }

Pandoc’s Markdown Best Practices

Warning: The following syntaxes may not be supported by all implementations.

Tabs in vim

Fri, 11 Oct 2024 00:00:00 +0000

Options Explanation

expandtab: a boolean value controls whether the real input is a tab character (\t) or the specified number of spaces.

 'expandtab' 'et' 'noexpandtab' 'noet'
'expandtab' 'et' boolean (default off)
 local to buffer
 In Insert mode: Use the appropriate number of spaces to insert a
 <Tab>. Spaces are used in indents with the '>' and '<' commands and
 when 'autoindent' is on. To insert a real tab when 'expandtab' is
 on, use CTRL-V<Tab>. See also :retab and ins-expandtab.

tabstop: number of spaces a tab visually counts for. Defaults to 8. It does not affect how many spaces/tabs will be inserted directly.

How to type annotate a Gzipfile in Python?

Sat, 05 Oct 2024 00:00:00 +0000

Pyright complains when I use the following code to process gzip files:

import gzip
import os
import typing


def readfile(f: os.PathLike | typing.TextIO):
	pass

with gzip.open("/path/to/foo.gz", 'r') as input:
 readfile(input)

Diagnostics:

 Argument of type "GzipFile" cannot be assigned to parameter "file" of type "PathLike[Unknown] | TextIO" in func
 tion "readfile"
   Type "GzipFile" is incompatible with type "PathLike[Unknown] | TextIO"
     "GzipFile" is incompatible with protocol "PathLike[Unknown]"
       "__fspath__" is not present
     "GzipFile" is incompatible with "TextIO" [reportArgumentType]

Text File inside

According to the gzip.open() docs:

The filename argument can be an actual filename (a str or bytes object), or an existing file object to read from or write to.

Configuring Domain Access for Locally Running Services

Sat, 24 Aug 2024 00:00:00 +0000

I often have some services running locally, and accessing their web pages via 127.0.0.1: every time feels too clumsy. It happened that a few days ago ICANN reserved .INTERNAL as a top-level domain dedicated to internal networks, so I used this domain for the configuration.

DNS

I need to configure the domain *.internal to point to 127.0.0.1. Since the method of hacking /etc/hosts does not support wildcards, I use dnsmasq to run a DNS service locally.

$ sudo pacman -S dnsmasq
$ sudo systemctl enable dnsmasq

+ Add the domain to the configuration

# /etc/dnsmasq.conf

address=/internal/127.0.0.1

+ A small problem encountered when starting the dnsmasq service: 127.0.0.1:53 is occupied. One solution is to run the service elsewhere in `/etc/dnsmasq.conf`. Remember that you need to configure the DNS address in systemd-resolved. Then restart dnsmasq and systemd-resolved. For various possible solutions, see: [link](https://askubuntu.com/questions/191226/dnsmasq-failed-to-create-listening-socket-for-port-53-address-already-in-use)

# /etc/dnsmasq.conf
listen-address=127.0.53.1
bind-interfaces


# /etc/systemd/resolved.conf
[Resolve]
DNS=127.0.53.1

Web Server

I need to configure a web server to point different subdomains to the correct ports. nginx is used here.

The Counterintuitive Behavior of nginx server_name

Sat, 24 Aug 2024 00:00:00 +0000

TL;DR

It is important to understand that Nginx will only evaluate the server_name directive when it needs to distinguish between server blocks that match to the same level of specificity in the listen directive.

While configuring a machine with a fresh Nginx installation, I found that the server_name setting did not work:

In a server block, server_name and location blocks were configured, and an application was running on local port 3000. *.internal and *.localhost already pointed to 127.0.0.1 in DNS records:

server {
 listen 80;
 server_name sub.internal;

 location / {
 proxy_pass http://127.0.0.1:3000;
 }
}

Under this configuration, the expected behavior is that accessing sub.internal is redirected to 127.0.0.1:3000, while accessing other domains such as whatever.internal or whatever.localhost does nothing.

How to Distinguish USB Connector Types

Mon, 19 Aug 2024 00:00:00 +0000

Env / Dependency

Arch Linux, x86_64
core/usbutils

Determining Whether a USB Device Supports USB 3.0

~~A blue connector generally means USB 3.0~~
USB 3.0 has five additional pins Image
Using lsusb:

$ lsusb 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 04f2:b689 Chicony Electronics Co., Ltd TOSHIBA Web Camera - HD
Bus 001 Device 003: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 1058:266e Western Digital Technologies, Inc. Elements SE SSD

$ lsusb -D /dev/bus/usb/002/004 
Device: ID 1058:266e Western Digital Technologies, Inc. Elements SE SSD
Couldn't open device, some information will be missing
Device Descriptor:
 bLength 18
 bDescriptorType 1
 bcdUSB 3.20

In the device descriptor, bcdUSB is the USB version supported by this USB device.

Setup remote server pubkey login

Sun, 18 Aug 2024 00:00:00 +0000

create pubkey pair locally: ssh-keygen

send key to server authorized_keys:

$ ssh-copy-id -p 22 -i <path_to_public_key> <username>@<host>

generate PuTTY-compatible private key format (*.ppk):

$ puttygen <path_to_private_key> -O private <path_to_ppk>

Basic Operations on Datatypes in Nix

Tue, 09 Jul 2024 00:00:00 +0000

Attribute sets

This is an example code, where ex0 to ex7 are evaluated to true.

with import <nixpkgs> { };
with lib;
let
 attr = {a="a"; b = 1; c = true;};
 s = "b";
in
{
 #replace all X, everything should evaluate to true
 ex0 = isAttrs attr;
 ex1 = attr.a == "a";
 ex2 = attr.${s} == 1;
 ex3 = attrVals ["c" "b"] attr == [ true 1 ];
 ex4 = attrValues attr == [ "a" 1 true ];
 ex5 = builtins.intersectAttrs attr {a="b"; d=234; c="";} 
 == { a = "b"; c = "";};
 ex6 = removeAttrs attr ["b" "c"] == { a="a"; };
 ex7 = ! attr ? a == false;
}

source: https://nixcloud.io/tour/?id=attrset/examples

404 Island Master

Thu, 04 Jul 2024 00:00:00 +0000

https://space.bilibili.com/2075535

Why Doesn't Your Mob Farm Spawn the Enemy You Want?

Thu, 04 Jul 2024 00:00:00 +0000

https://www.bilibili.com/video/BV1EW4y197dh

Notes taken while watching [[岛主]]’s video BV1EW4y197dh

Enemy spawning controlled by the biome (floor: any artificial block)

Pure cave
- Regular cave enemies
Evil
- Regular cave enemies + the biome mimic of the corresponding biome
Hallow
- Regular cave enemies + Hallowed Mimic + Illuminant Bat, Illuminant Slime
Snow
- Snow enemies
Jungle
- All bats are replaced with Jungle Bats

Enemy spawning controlled by blocks (biome: any biome)

Jungle Grass
- Bee, Jungle Spider, Giant Tortoise, Spiked Slime
Hive Block

Functional Programming

Sun, 30 Jun 2024 00:00:00 +0000

Nix

Sun, 30 Jun 2024 00:00:00 +0000

References

Nix Language Basics

Sun, 30 Jun 2024 00:00:00 +0000

Nix is Functional, Lazy evaluated.

interactive interpreter: nix repl. Execute a file containing nix expression: nix-instantiate --eval file.nix.

let expression (let binding): specify binding scope

e.g. let a=1; b=2; in a+b -> 3

datatypes:

attribute set { name1 = ...; name2 = ...; }, where ... can be a string, number, list or attribute set.
- rec attribute set: rec { ... }, allow access to attributes within the set itself.

Configure Maunium Stickerpicker for Element

Sun, 05 May 2024 00:00:00 +0000

GitHub - maunium/stickerpicker: A fast and simple Matrix sticker picker widget

Maintainer side

Install

% cd stickerpicker
% pip install .

If encountered env KeyError in Windows, refer to issue #52:

# setup.py
long_desc = open("README.md", encoding="utf-8").read()

% $env:HOME = $env:USERPROFILE
% pip install .

Create decks

Put the stickers into an arbitory folder. Call sticker-import /path/to/dir --add-to-index ./web/packs. (python3 -m sticker.import ... if in Windows)

The script will prompt for homeserver and access_token, both can be found in All Settings > Help & About.

Clangd cannot find standard header

Mon, 15 Jan 2024 00:00:00 +0000

When using clangd (16.0.2) as LSP, it throws the following error:

[pp_file_not_found] Line 1: 'stdlib.h' file not found

But stdlib.h exists, and gcc compilation passed.

TL;DR

Create compilation database file at root of project, content:

-isystem
C:\Users\username\scoop\apps\gcc\current\x86_64-w64-mingw32\include
-target
x86_64-pc-windows-gnu

Where the 2nd line is the path to stdlib.h.

Debug Process

Use --check to run clangd and get error info:

% .\clangd.exe --check=\path\to\file.c

Log:

I[12:18:46.915] clangd version 16.0.2 (https://github.com/llvm/llvm-project 18ddebe1a1a9bde349441631365f0472e9693520)
...
I[12:18:46.924] Loading compilation database...
I[12:18:46.934] Failed to find compilation database for C:\Users\username\path\to\c_file.c
I[12:18:46.935] Generic fallback command is: "C:\\Users\\username\\scoop\\apps\\gcc\\11.2.0\\bin\\clang" "-resource-dir=C:\\Users\\username\\AppData\\Roaming\\nvim-data\\mason\\packages\\clangd\\clangd_16.0.2\\lib\\clang\\16" -- "C:\\Users\\username\\path\\to\\c_file.c"
...
I[12:18:46.970] Testing features at each token (may be slow in large files)
I[12:18:47.006] All checks completed, 2 errors

According to this post, “Generic fallback …” entry means no compilation database. Create an empty compile_flags.txt besides file.c, re-run check command, log:

Big Data System Lab Note

Mon, 09 Oct 2023 00:00:00 +0000

Set up Hadoop environment

Apache Hadoop 3.3.6 – Hadoop: Setting up a Single Node Cluster.

set up java environment

java version requirements:

https://cwiki.apache.org/confluence/display/HADOOP/Hadoop+Java+Versions

% curl -sL "https://builds.openlogic.com/downloadJDK/openlogic-openjdk/8u382-b05/openlogic-openjdk-8u382-b05-linux-x64.tar.gz" -o ./openjdk-8u382.tar.gz
% tar -xvf ./openjdk-8u382.tar.gz
% mv ./openlogic-openjdk-8u382-b05-linux-x64 ./usr/bin/openjdk-8u832
% sudo vim ~/.zshrc

add java to path:

# ~/.zshrc

#...
export JAVA_PATH="/usr/bin/openjdk-8u832/bin"
export PATH=$PATH:$JAVA_PATH

test path:

% source ~/.zshrc
% java -version 1 ↵
openjdk version "1.8.0_382-382"
OpenJDK Runtime Environment (build 1.8.0_382-382-b05)
OpenJDK 64-Bit Server VM (build 25.382-b05, mixed mode)

requisite software

ssh required, pdsh for better performance.

Terraria Herb Farm Reminder

Fri, 08 Sep 2023 00:00:00 +0000

Announcement box text:

[c/ff0000:Row 0][i:318][i:312][c/ff0000:Fireblossom] Sunset && Not Raining
[c/6e17ff:Row 1][i:316][i:310][c/6e17ff:Deathweed] Blood Moon || Full Moon
[c/ffcb2e:Row 2][i:315][i:309][c/ffcb2e:Blinkroot] Random
[c/ffff00:Row 3][i:313][i:307][c/ffff00:Dayblossom] Daytime
[c/00bfff:Row 4][i:314][i:308][c/00bfff:Moonglow] Nighttime
[c/0000ff:Row 5][i:2358][i:2357][c/0000ff:Shiverthorn] Fixed Period
[c/2effff:Row 6][i:317][i:311][c/2effff:Waterleaf] Raining || Snowing

#Terraria

Terraria Potions Quickref

Mon, 28 Aug 2023 00:00:00 +0000

For battle

Potion	Fish	Herb	Other ingredients
Endurance	Armored Cavefish	Blinkroot	-
Heartreach	Crimson Tigerfish	Daybloom	-
Ironskin	-	Daybloom	Iron Ore
Lifeforce	Prismite	Moonglow + Shiverthorn + Waterleaf	-
Rage	Hemopiranha	Deathweed	-
Regeneration	-	Daybloom	Mushroom
Swiftness	-	Blinkroot	Cactus
Summoning	Variegated Lardfish	Moonglow	-
Thorns	-	Deathweed	Cactus
Wrath	Ebonkoi	Deathweed	-

For battle (optional)

Use cases	Potion/Flask	Fish	Herb	Other ingredients
Ranger	Ammo Reservation	Double Cod	Moonglow	-
Ranger	Archery	-	Daybloom	Lens
Decrease enemy spawn rate	Calming	Damselfish	Daybloom	-
Melee/Whips	Flask of Ichor	-	-	Ichor
Fishron Duke	Inferno	Flarefin koi + Obsidifish	-	-
Mage	Magic Power	-	Moonglow + Deathweed	Fallen Star
Mage	Mana Regeneration	-	Moonglow + Daybloom	Fallen Star
Summoner	Summoning	Variegated Lardfish	Moonglow	-
Increase KB	Titan	-	Deathweed + Shiverthorn	Bone
Cold battle	Warmth	Frost Minnow	Shiverthorn	-

Others

Potion	Fish	Herb	Other ingredients
Dangersense	-	Shiverthorn	Cobweb
Obsidian Skin	-	Fireblossom + Waterleaf	Obsidian
Wormhole	Specular fish	Blinkroot	-

#Terraria

A Simple Terraria Chest Organization System

Tue, 11 Jul 2023 00:00:00 +0000

Read in English | Simplified Chinese

en

This post proposes a simple chest organization system, tested in practice. The experience is collected mostly from AC and some from Hyzuki.

Drawings 1

Banners 4

Furniture (including chests, trophies) 3

Blocks 2

Potions 3

For battle 1
Not for battle 1
Fish used to craft potion 1

Statues (including gravemarkers) 2

Dry things 3

Wet things (including dyes) 2

Animals 1

Plants 1

Fishing 1

Ores & Bars 2

Tools (Hammers, water candles, etc.)

Wood 1

Weapons 11

Melee 3
Ammo&Ranged 1 + Ranged 2

Empress of Light Fight Notes

Mon, 10 Jul 2023 00:00:00 +0000

For a long time, fighting the Empress of Light has been a stubborn, long-standing contradiction. In a certain sense, whether the problem of fighting the Empress of Light can be thoroughly resolved concerns the adjustment of conditions, the support of burdens, the upholding of key points, and respect for the basic program; it concerns the promotion of action, and is the top priority in unifying thought. Therefore, resolving the problem of fighting the Empress of Light is an endeavor that runs through the entire process.

Terraria Text Color

Sat, 20 May 2023 00:00:00 +0000

In terraria, announcement-box-syntax can be used to display text in different colors. This post records some color codes of my common use. They may not be accurate since they are obtained using the colorpicker.

Announcement Box Syntax

To specify a color, use [c/<color code>:<text>].

For example, [c/FFFF00:114514!] will be displayed as

114514!

To display an item, use [i/<attribute>:<ID>], where is the item id and can be in the following syntax:

Configure Maubot

Thu, 18 May 2023 00:00:00 +0000

Maubot is a plugin-based Matrix bot SDK.

Its documentation is not written very well, and it doesn’t give a sensible, ordered installation process. In fact, when I installed it I had to jump back and forth between various sections of the docs, so I’m recording a reasonable configuration workflow here.

Set Up the Environment

Install maubot via pip.

$ python3 -m venv maubotVenv
$ source ./maubotVenv/bin/activate
$ pip install --upgrade maubot

Add the necessary files and directories, otherwise it will report an error.

Leetcode 142 - Linked List Cycle II

Wed, 26 Apr 2023 00:00:00 +0000

Problem

Given the head of a linked list, return the node where the cycle begins. If there is no cycle, return null.

There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer. Internally, pos is used to denote the index of the node that tail’s next pointer is connected to (0-indexed). It is -1 if there is no cycle. Note that pos is not passed as a parameter.

Change Font in Hexo Cactus Theme

Thu, 06 Apr 2023 00:00:00 +0000

Modify themes/cactus/source/layout/_partial/header.ejs.

<!-- styles -->
 <link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/lxgw-wenkai-webfont/1.6.0/style.min.css" />
 <%- css('css/style') %>

https://github.com/chawyehsu/lxgw-wenkai-webfont

Modify _variables.styl

// Fonts
$font-family-body = "Menlo", "Meslo LG", "LXGW WenKai", monospace
$font-family-mono = "Menlo", "Meslo LG", "LXGW WenKai Mono", monospace
$font-size = 14px
...

Deprecated

Deprecated because ttf file is too big for users to load from this source. Use a CDN is better.

how to change the font size ? · Issue #311 · probberechts/hexo-theme-cactus · GitHub

Configuring an Open-Source Alternative to Zepp Life for a Xiaomi Mi Band

Sun, 22 Jan 2023 00:00:00 +0000

Steps: https://codeberg.org/Freeyourgadget/Gadgetbridge

Download Gadgetbridge

Gadgetbridge | F-Droid - Free and Open Source Android App Repository

Obtain the auth key

Steps: Huami Server Pairing - Gadgetbridge - Codeberg.org

If the app the band was originally bound to is “Mi Wear” (com.xiaomi.wearable), it will not return normal information. You can first switch to binding the band with “Zepp Life” (com.xiaomi.hm.health).

$ git clone https://codeberg.org/argrento/huami-token.git
$ cd huami-token
$ python3 huami_token.py --method xiaomi --bt_keys

Configure Vim on Linux Mint 20.03

Sat, 12 Feb 2022 00:00:00 +0000

This is just a simple record. About the configuring process on Windows, here is another blog.

Version Info

Vi IMproved 8.1 (2018 May 18)

Huge version with GTK3 GUI.

.vimrc

" All system-wide defaults are set in $VIMRUNTIME/debian.vim and sourced by
" the call to :runtime you can find below. If you wish to change any of those
" settings, you should do it in this file (/etc/vim/vimrc), since debian.vim
" will be overwritten everytime an upgrade of the vim packages is performed.
" It is recommended to make changes after sourcing debian.vim since it alters
" the value of the 'compatible' option.

runtime! debian.vim

" Vim will load $VIMRUNTIME/defaults.vim if the user does not have a vimrc.
" This happens after /etc/vim/vimrc(.local) are loaded, so it will override
" any settings in these files.
" If you don't want that to happen, uncomment the below line to prevent
" defaults.vim from being loaded.
let g:skip_defaults_vim = 1

" Uncomment the next line to make Vim more Vi-compatible
" NOTE: debian.vim sets 'nocompatible'. Setting 'compatible' changes numerous
" options, so any other options should be set AFTER setting 'compatible'.
"set compatible

" Vim5 and later versions support syntax highlighting. Uncommenting the next
" line enables syntax highlighting by default.
if has("syntax")
syntax on
endif

" If using a dark background within the editing area and syntax highlighting
" turn on this option as well
"set background=dark

" Uncomment the following to have Vim jump to the last position when
" reopening a file
"au BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$") exe "normal! g'\"" endif

" Uncomment the following to have Vim load indentation rules and plugins
" according to the detected filetype.
"filetype plugin indent on

" The following are commented out as they cause vim to behave a lot
" differently from regular Vi. They are highly recommended though.
"set showcmd" Show (partial) command in status line.
"set showmatch" Show matching brackets.
"set ignorecase" Do case insensitive matching
"set smartcase" Do smart case matching
"set incsearch" Incremental search
"set autowrite" Automatically save before commands like :next and :make
"set hidden" Hide buffers when they are abandoned
"set mouse=a" Enable mouse usage (all modes)

" Source a global configuration file if available
if filereadable("/etc/vim/vimrc.local")
source /etc/vim/vimrc.local
endif

set nocompatible
set autoread"reload files when changed on disk (via Git)
set shortmess=atI"use ":h shortmess to view help

set magic
set title
set nobackup

set noerrorbells
set visualbell t_vb=
set t_vb=
set timeoutlen=1000

"Encodings
set encoding=utf-8
set fileencodings=usc-bom,utf-8,cp936,gb18030,big5,euc-jp,euc-kr,latin1
set fileformats=unix,dos,mac
set termencoding=utf-8
set formatoptions+=m
set formatoptions+=B

"View
set ruler
set number
set showcmd
set showmode
set showmatch
set matchtime=2
set guifont=Ubuntu\ Mono\ Regular\ 15 " IMPORTANT: :h15 can't be recognized

"Searching
set hlsearch"highlight searches
set incsearch"incremerntal searching
set ignorecase
set smartcase" no ignore case when Uppercase char present

"Tab
set expandtab" expand all tabs to spaces\
set smarttab
set shiftround

"Indent
set autoindent smartindent shiftround
set shiftwidth=4
set tabstop=4
set softtabstop=4

"Cursor
set cursorcolumn
set cursorline

" Theme
syntax enable
set background=dark
colorscheme solarized

"KeyMapping
nnoremap k gk
nnoremap gk k
nnoremap j gj
nnoremap gj j

YouCompleteMe

Cmake

$ pip install –user cmake

Crawl song lyrics in NetEase

Tue, 08 Feb 2022 00:00:00 +0000

Introduction

Beginning to learn Python, @Zei_Wai and I want to do some simple tasks, instead of diving into the sea of the documentation of Python. Then we chose this: generating a WordCloud picture of the lyrics of NeteaseMusic Songlist.

Using urllib package

First we found an api of Netease:

https://music.163.com/api/song/lyric?id=<song.id>&lv=1&kv=1&tv=-1

where <song.id> is the id of songs in Netease database. When we use web client to play music, the URL of music playing page contains this id. For a simple example, if we want to get the lyrics of Bad Apple!! we just need to do like this:

Dual Boot Win10 and Linux Mint

Sat, 22 Jan 2022 00:00:00 +0000

Introduction

I already have Windows 10 installed on my computer, and want to install Linux to dual boot.

Preparation

I don’t have any experience on installing a new OS. So I have to investigate enough to minimize the probability that emergencies happen.

Distro

I choose Linux Mint 20.03(Edge). This stable edition is distributed on Jan. 17, 2022. Some videos that helps to choose a distro (provided by @Erik):

Linux HATES Me – Daily Driver CHALLENGE Pt.1 - YouTube

What do these mojibake mean? - UTF-8 Encoding Scheme Exploration

Wed, 08 Dec 2021 00:00:00 +0000

This article may contain horrific and gory videos. Be careful when clicking on the URLs. If you have any discomfort when browsing, please stop and leave.

Introduction

We often meet mojibake, in games, web pages, or somewhere else. UTF-8 is the most widespread encoding scheme. These days @叉叉 and @北嘲 find some weird videos on YouTube, with obscure titles and terrifying cover. We are curious about the origin of these creepy videos. This article is to record our exploration process.

Probability of Christmas on Wednesday

Thu, 14 Oct 2021 00:00:00 +0000

Original Problem

Proof: In the system of the current Common Era, the probability of Christmas on Wed. is not 1/7.

What exactly the probability is

In 400 years there are 303 non-leap years and 97 leap years. Total number of days:

$$T = 303\cdot 365 + 97\cdot 366\equiv 303 + 97\cdot 2\equiv 0\pmod 7.$$

This means: If the Christmas is on Mon. in year x, then it would be on Mon. in year (x + 400). That’s to say, there’s a difference between a day of the week and another day of the week.

Vim commands quickref

Mon, 04 Oct 2021 00:00:00 +0000

Move cursor

h and l : Left and Right. k and j : Up and Down.

Basic Edit

i: enter insert mode, cursor is before the highlighted character. a: enter insert mode, cursor is after the highlighted character.

:wq: save and quit. :q!: quit and do not save.

Delete and Undo

x: delete the current highlighted character.

d: delete. Its basic format is d .

motion: w: move cursor to the next word’s first letter. e: move cursor to the current word’s last letter. $: move cursor to the end of this line.

Configure gVim on Windows

Sat, 02 Oct 2021 00:00:00 +0000

Version Info

gVim version 8.1.1 8.2.0577 for Windows

Initialize

First add these lines to _vimrc.

set nocompatible
set autoread
set shortmess=atI

set magic
set title
set nobackup

set noerrorbells
set visualbell t_vb=
set t_vb=
set timeoutlen=500

set fileencodings=ucs-bom,utf-8,cp936,gb18030,big5,euc-jp,euc-kr,latin1
set fileformats=unix,dos,mac
set termencoding=utf-8
set formatoptions+=m
set formatoptions+=B
set guifont=Source\ Code\ Pro:h14

set ruler
set number
set nowrap
set showcmd
set showmode
set showmatch
set matchtime=2

set hlsearch
set incsearch
set ignorecase
set smartcase

set expandtab
set smarttab
set shiftround

set autoindent smartindent shiftround
set shiftwidth=4
set tabstop=4
set softtabstop=4

set cursorcolumn
set cursorline

filetype on
syntax on

set foldmethod=syntax
set nofoldenable

Install Theme: Solarized

A Roundup of 15 Famous Vim Color Schemes - Vim Beginner Tutorial (7)

A Process Record of Investigating the Cycle and Intersection Properties of Singly Linked Lists

Wed, 22 Sep 2021 00:00:00 +0000

Problem

How do you determine whether a cycle exists in a singly linked list? How do you determine whether two singly linked lists intersect? If they intersect, how do you find the intersection point?

Approach

First Thoughts

Detecting a cycle: traverse the list. If there is no cycle you will reach NULL; if there is a cycle you will reach head.
Detecting intersection: a singly linked list has only one next field, so intersection must be one of two cases: “both have no cycle” or “one has a cycle and the other does not.”
Where were these first thoughts inadequate? After thinking over the following days, I gradually realized where the flaws were…

CuSO4_Deposit

Friends

Now

Work

In Real Life

In the Cyber World

Uses

Tier 1 / recommended

Hardware

85 Disinfectant Column: Microsoft Excel Formulas I Wrote for Others and Bugs I Debugged

Configuring a Xiaomi AI Speaker to Connect to a Computer (Windows, Linux)

Some Official RSS Feeds

An alternative solution to direnv dropping aliases and functions

type unicode characters in Linux (most GTK- or Qt- based applications)

Use flakes within a git repo without commiting flake.nix

Zustand Notes

Manipulating Directories - Shell Builtins cd pushd and popd

Finding All Other Packages That Depend on a Specific Nix Package - Notes on Fixing the Qt5 Deprecation

Terraria Data Directory

References

Building loong64 Docker Images on NixOS

Next build stuck on "Creating an optimized production build" forever

Problem

Love Flops Viewing Retrospective Notes

Spoiler Warning

⚛️💡 LLM Prompts

Docstrings != Multiline strings

Markdown - Syntaxes that I don't Know

Syntaxes

Line Break

Bold and Italic

Nest Another Element in a List

Escape Backticks in a Code Element

Adding a Title for a Link

Automatic Links

Formatting Links

Reference-style Links

Linking Images

Verbatim Code Blocks

Pandoc’s Markdown Best Practices

Tabs in vim

Options Explanation

How to type annotate a Gzipfile in Python?

Text File inside

Configuring Domain Access for Locally Running Services

DNS

Web Server

The Counterintuitive Behavior of nginx server_name

TL;DR

How to Distinguish USB Connector Types

Env / Dependency

Determining Whether a USB Device Supports USB 3.0

Setup remote server pubkey login

Basic Operations on Datatypes in Nix

Attribute sets

404 Island Master

Why Doesn't Your Mob Farm Spawn the Enemy You Want?

Functional Programming

Nix

References

Nix Language Basics

Configure Maunium Stickerpicker for Element

Maintainer side

Install

Create decks

Clangd cannot find standard header

TL;DR

Debug Process

Big Data System Lab Note

Set up Hadoop environment

set up java environment

requisite software

Terraria Herb Farm Reminder

Terraria Potions Quickref

For battle

For battle (optional)

Others

A Simple Terraria Chest Organization System

en

Empress of Light Fight Notes