🌈️ apply a wallpaper based on the weather outside
feat: rewrite in zx, store data in cache file instead of directories
Angel Wang
(Jun 20, 2026, 1:29 PM -0600)
6642b97e
889c7407
+107
-85
+107
grade.mjs
+107
grade.mjs
···
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#!/usr/bin/env zx
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import "fs";
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await $`rm -f cache.json`;
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// await $`lutgen apply -p catppuccin-latte -l 8 -L 0.001 -P -r 21.5 ./orig/* -o ./graded`;
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cd("./graded");
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const files = await fs.promises.opendir(".");
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let json = {};
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// set up the data storage
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let lightnessData = [];
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for (var i = 0; i < 10; i += 2) {
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lightnessData.push({ lightness: i / 10, paths: [] });
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}
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let chromaData = [];
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for (var i = 0; i < 10; i += 2) {
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chromaData.push({ chroma: i / 100, paths: [] });
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}
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let hueData = [];
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for (var i = 0; i < 360; i += 90) {
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hueData.push({ hue: i, paths: [] });
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}
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// analyze the files
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for await (const file of files) {
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const stat = await fs.promises.stat(file.name);
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if (stat.isFile()) {
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let output =
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await $`magick ${file.name} -colorspace Oklch -kmeans 10 -format "%c" histogram:info:`.then(
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(s) =>
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s.stdout
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.split("\n")
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.map((substr) => substr.trim())
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.filter((n) => n),
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);
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if (output.length < 5) {
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// do it again but with more violence
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console.log(
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`-kmeans 10 of ${file.name} didn't give enough colours, trying again with a higher value...`,
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);
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output =
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await $`magick ${file.name} -colorspace Oklch -kmeans 40 -format "%c" histogram:info:`.then(
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(s) =>
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s.stdout
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.split("\n")
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.map((substr) => substr.trim())
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.filter((n) => n),
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);
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}
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let colours = output.map((entry) => {
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let arr = entry.split(" ");
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arr.pop();
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// [# of pixels, oklab colour, hex code]
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return [parseInt(arr[0]), arr[1].replace(/[()]/g, "").split(","), arr[2]];
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});
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colours.sort((a, b) => b[0] - a[0]);
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const dominantColour = colours[0][1];
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console.log(
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`Got oklch(${dominantColour}) as dominant colour of ${file.name}!`,
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);
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const lightness = dominantColour[0];
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const chroma = dominantColour[1];
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const hue = dominantColour[2];
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lightnessData.forEach((n) => {
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let targetLightness = Math.floor(lightness * 5) / 5;
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if (n.lightness == targetLightness) {
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n.paths.push(file.name);
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return;
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}
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});
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chromaData.forEach((n) => {
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let targetChroma = Math.floor(chroma * 50) / 50;
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if (n.chroma == targetChroma) {
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n.paths.push(file.name);
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return;
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}
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});
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hueData.forEach((n) => {
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let targetHue = Math.floor(hue / 90) * 90;
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if (n.hue == targetHue) {
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n.paths.push(file.name);
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return;
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}
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});
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json["lightnessData"] = lightnessData;
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json["chromaData"] = chromaData;
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json["hueData"] = hueData;
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fs.writeFile("./cache.json", JSON.stringify(json), err => {})
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// past 0.3, the image is way too dark to have any discernable colour
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}
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}
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-85
grade.sh
-85
grade.sh
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#!/usr/bin/env bash
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# RULES:
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# Eliminate golden first, it's the outlier
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# LAB -> a greater than 50: golden
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# The rest of the categories:
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# LAB -> l less than 45: night
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# LAB -> l less than 60: day
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# LAB -> l all other: noon
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# Clear/overcast
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# HSI -> s less than 10: overcast
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# HSI -> l else: clear
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rm -r graded && mkdir -p graded/{night,golden,day,noon}/{clear,overcast}
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lutgen apply -p catppuccin-latte -l 8 -L 0.001 -P -r 21.5 ./orig/* -o ./graded
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cd graded
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for file in *; do
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if [ -f "$file" ]; then
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l=$(magick $file -colorspace Oklch -channel 0 -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# c=$(magick $file -colorspace Oklch -channel 1 -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# h=$(magick $file -colorspace Oklch -channel b -separate +channel -format "%[fx:u.mean]\n" info:)
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echo $l
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# if (( $(echo "$h > 285" | bc -l) )) || (( $(echo "$h < 90" | bc -l) )) ; then
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# echo $h
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# mv $file golden/$file
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# fi
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fi
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done
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# for file in *; do
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# if [ -f "$file" ]; then
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# b=$(magick $file -colorspace LAB -channel b -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# # l=$(magick $file -colorspace LAB -channel r -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# # && (( $(echo "$l > 50" | bc -l) ))
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# a=$(magick $file -colorspace LAB -channel g -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# if (( $(echo "$a > 51" | bc -l) )) && (( $(echo "$b > 47" | bc -l) )) ; then
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# mv $file golden/$file
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# fi
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# # for file in golden/*; do
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# # if [ -f "$file" ]; then
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# # if (( $(echo "$a < 55" | bc -l) )) && (( $(echo "$b < 55" | bc -l) )); then
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# # mv $file ${file%/*}/overcast/${file#*/}
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# # else
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# # mv $file ${file%/*}/clear/${file#*/}
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# # fi
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# # fi
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# # done
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# fi
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# done
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# for file in *; do
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# if [ -f "$file" ]; then
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# l=$(magick $file -colorspace LAB -channel r -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# if (( $(echo "$l < 50" | bc -l) )); then
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# mv $file night/$file
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# elif (( $(echo "$l < 60" | bc -l) )); then
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# mv $file day/$file
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# else
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# mv $file noon/$file
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# fi
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# fi
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# done
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# for file in */*; do
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# if [ -f "$file" ]; then
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# s=$(magick $file -colorspace HSI -channel g -separate +channel -format "%[fx:100*u.mean]\n" info:)
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# if (( $(echo "$s < 15" | bc -l) )); then
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# mv $file ${file%/*}/overcast/${file#*/}
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# else
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# mv $file ${file%/*}/clear/${file#*/}
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# fi
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# fi
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# done