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#!/usr/bin/env bash
set -euo pipefail
subreddit="EarthPorn"
wallpaper_dir="$HOME/wallpapers"
min_width=1920
mkdir -p "$wallpaper_dir"
json=$(curl -sf -A "Mozilla/5.0 (X11; Linux x86_64) get-new-wallpaper/1.0" \
"https://www.reddit.com/r/${subreddit}.json?limit=25")
# Keep posts where:
# - preview source exists and is at least min_width wide
# - aspect ratio is wider than 4:3
# For Reddit-hosted images use i.redd.it directly; for external images fall back
# to the signed preview.redd.it URL so hotlink protection doesn't bite us.
mapfile -t candidates < <(echo "$json" | jq -r \
--argjson min "$min_width" '
.data.children[].data |
select(.preview.images[0].source != null) |
select(.preview.images[0].source.width >= $min) |
select((.preview.images[0].source.width / .preview.images[0].source.height) > (4/3)) |
[
.title,
(if (.url | test("^https://i\\.redd\\.it/")) then .url
else (.preview.images[0].source.url | gsub("&"; "&"))
end)
] | @tsv
')
if [[ ${#candidates[@]} -eq 0 ]]; then
echo "No suitable images found." >&2
exit 1
fi
selected="${candidates[$((RANDOM % ${#candidates[@]}))]}"
title=$(printf '%s' "$selected" | cut -f1)
img_url=$(printf '%s' "$selected" | cut -f2)
safe_name=$(printf '%s' "$title" \
| tr '[:upper:]' '[:lower:]' \
| sed 's/[^a-z0-9 ]//g' \
| tr -s ' ' '-' \
| sed 's/^-//; s/-$//' \
| cut -c1-60)
ext=$(printf '%s' "$img_url" | grep -oP '\.(jpg|jpeg|png|webp)' | tail -1 | tr -d '.')
[[ -z "$ext" ]] && ext="jpg"
filename="${wallpaper_dir}/${safe_name}.${ext}"
echo "Downloading: $title"
curl -sfL \
-A "Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0" \
--referer "https://www.reddit.com/" \
-o "$filename" "$img_url" || { echo "Download failed." >&2; rm -f "$filename"; exit 1; }
echo "Saved: $filename"
set-wallpaper "$filename"
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