https://github.com/s5bug/niji

`clear` but it looks cool
https://github.com/s5bug/niji

Last synced: 1 day ago
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`clear` but it looks cool

• Host: GitHub
• URL: https://github.com/s5bug/niji
• Owner: s5bug
• Created: 2024-04-24T06:19:49.000Z (9 months ago)
• Default Branch: main
• Last Pushed: 2024-04-24T06:46:25.000Z (9 months ago)
• Last Synced: 2024-11-10T16:12:39.597Z (about 2 months ago)
• Language: C++
• Size: 5.86 KB
• Stars: 6
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# niji

clears your terminal screen but rainbow

based on [the old X68000 niji](https://twitter.com/kata68k/status/1782780099148046481)

## building

build via CMake. release mode via `-DCMAKE_BUILD_TYPE=Release`.

if building via MinGW cut the binary size in 4 by `strip`ping it afterward.

## linux when?

currently this functions on Windows by using `ReadConsoleOutputCharacterW` to get the current state of the screen. for a

Linux version, this would have to be replaced with

- DECRQCRA, to retrieve the hash of a character+formatting at a location

- DECSERA, to replace the formatting of a character at a location with known formatting, to crack the character hash

- BSU/DSU (DECSET 2026), to prevent the screen flashes (to mimic `WriteConsoleW`'s single-chunk behavior)

Windows Terminal's DECRQCRA is turned off by default, reasonably so as it allows malicious processes to see anything in

the terminal. I believe (but am not sure) that the `kitty` and `alacritty` terminals support both DECRQCRA and

synchronized updates; if I could test them I would add CMake options for choosing the target environment.

additionally, the Windows version uses `DwmFlush` to do a small frame wait, rather than deal with the 15ms Windows

scheduler resolution. due to Linux scheduling being higher-resolution, this could probably be replaced with some sort of

sleep.

## DECCARA

DECCARA does not support changing colors: it supports a finite subset of SGI commands, of which the only one even

relevant to our cause is text inversion. if there were to be a more "modern" equivalent for DECCARA that could change

the colors of a rectangle in the console, this program could be achieved without any sort of security holes.