75 lines
2.2 KiB
Text
75 lines
2.2 KiB
Text
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#!/bin/sh
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# Determine the next wallpaper by round robin from the cloud
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# and install it as the background files referenced in
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# ~/.config/gnome-settings/{misc,shell-extensions}.ini
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#
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# Candidates:
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# - Pairs => Both "<name>-d.jpg" and "<name>-l.jpg" exist
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# - Singles => Any other "*.jpg" not following the -d/-l scheme,
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# used as dark and light at the same time
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set -eu
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SOURCE_DIR="$HOME/Cloud/Null-Tech/Backgrounds"
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TARGET_DIR="${XDG_DATA_HOME:-$HOME/.local/share}/backgrounds"
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STATE_FILE="${XDG_STATE_HOME:-$HOME/.local/state}/current-background.txt"
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[ -d "$SOURCE_DIR" ] || { echo "No such folder: $SOURCE_DIR" >&2; exit 1; }
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# One candidate per line, tab-separated: <dark-file> <light-file>
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candidates=$(
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for jpg in "$SOURCE_DIR"/*.jpg; do
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[ -e "$jpg" ] || continue # because the glob does not expand if empty
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case "$jpg" in
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*-d.jpg) # Complete pairs only
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stem="${jpg%-d.jpg}"
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[ -f "$stem-l.jpg" ] && printf '%s\t%s\n' "$jpg" "$stem-l.jpg"
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;;
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*-l.jpg) # Already handled via its "-d" counterpart above
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;;
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*) # A single file to be used for both modes
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printf '%s\t%s\n' "$jpg" "$jpg"
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;;
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esac
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done
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)
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if [ -z "$candidates" ]; then
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echo "No usable *.jpg files in: $SOURCE_DIR" >&2
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exit 1
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fi
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echo "Found $(printf '%s\n' "$candidates" | wc -l) candidate(s)"
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# The glob expands alphabetically => "$candidates" is already sorted
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# => Pick the first candidate sorting strictly after the last-used one,
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# falling back to the first (e.g., for start, wrap-around, or missing state file)
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last=$(cat "$STATE_FILE" 2>/dev/null || true)
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chosen=$(printf '%s\n' "$candidates" | awk -F '\t' -v last="$last" '$1 > last { print; exit }')
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[ -n "$chosen" ] || chosen=$(printf '%s\n' "$candidates" | head -n 1)
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dark=$(printf '%s' "$chosen" | cut -f 1)
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light=$(printf '%s' "$chosen" | cut -f 2)
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echo "Chosen: $(basename "$dark")"
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mkdir -p "$TARGET_DIR" "$(dirname "$STATE_FILE")"
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cp -- "$dark" "$TARGET_DIR/dark.jpg"
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cp -- "$light" "$TARGET_DIR/light.jpg"
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printf '%s\n' "$dark" > "$STATE_FILE"
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echo "Installed as: $TARGET_DIR/{dark,light}.jpg"
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