Add configuration for GNOME
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152
.local/bin/randomize-background
Executable file
152
.local/bin/randomize-background
Executable file
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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.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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#
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# The live `gsettings` URIs point at uniquely named copies
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# because `gnome-shell` caches background images by file URI;
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# `gnome-restore` cleans up that temporary state during the next login
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set -eu
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XDG_CONFIG_HOME="${XDG_CONFIG_HOME:-$HOME/.config}"
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XDG_DATA_HOME="${XDG_DATA_HOME:-$HOME/.local/share}"
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XDG_STATE_HOME="${XDG_STATE_HOME:-$HOME/.local/state}"
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SOURCE_DIR="$HOME/Cloud/Null-Tech/Backgrounds"
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TARGET_DIR="$XDG_DATA_HOME/backgrounds"
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LOCAL_INI="$XDG_CONFIG_HOME/gnome-settings/local/temporary_background.ini"
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STATE_FILE="$XDG_STATE_HOME/current-background.txt"
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[ -d "$SOURCE_DIR" ] || {
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echo "No such folder: $SOURCE_DIR" >&2
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exit 1
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}
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# One candidate per line, tab-separated: <dark-file> <light-file>
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candidates=$(
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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 => "$candidates" is already sorted
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# => Pick the first candidate sorting strictly after the last-used one,
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# falling back to the first one if necessary
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# (e.g., for start, wrap-around, or missing state file)
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last_background=$(cat "$STATE_FILE" 2>/dev/null || true)
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next_background=$(printf '%s\n' "$candidates" | awk -F '\t' -v last_background="$last_background" '$1 > last_background { print; exit }')
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[ -n "$next_background" ] || next_background=$(printf '%s\n' "$candidates" | head -n 1)
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dark_source=$(printf '%s' "$next_background" | cut -f 1)
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light_source=$(printf '%s' "$next_background" | cut -f 2)
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echo "Chosen background: $(basename "$dark_source")"
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dark_target="$TARGET_DIR/dark.jpg"
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light_target="$TARGET_DIR/light.jpg"
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# Create a unique name per run
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# so that the URIs below never repeat
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timestamp=$(date +%s)
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dark_live_target="$TARGET_DIR/dark-tmp-$timestamp.jpg"
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light_live_target="$TARGET_DIR/light-tmp-$timestamp.jpg"
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mkdir -p \
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"$TARGET_DIR" \
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"$(dirname "$LOCAL_INI")" \
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"$(dirname "$STATE_FILE")"
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# Fixed-name copies, referenced as login-time defaults in the *.ini files
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cp -- "$dark_source" "$dark_target"
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cp -- "$light_source" "$light_target"
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# Uniquely named copies for the live `gsettings` URIs
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# to ensure `gnome-shell` uses the correct files right away
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cp -- "$dark_source" "$dark_live_target"
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cp -- "$light_source" "$light_live_target"
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printf '%s\n' "$dark_source" > "$STATE_FILE"
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Background=org.gnome.desktop.background
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Screensaver=org.gnome.desktop.screensaver
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gsettings set $Background picture-uri-dark "file://$dark_live_target"
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gsettings set $Background picture-uri "file://$light_live_target"
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gsettings set $Screensaver picture-uri "file://$dark_live_target"
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# Persist the unique URIs for `gnome-restore`,
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# which loads local/*.ini after the base *.ini files
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cat > "$LOCAL_INI" <<EOF
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# Written by $(basename "$0") - do not edit
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[org/gnome/desktop/background]
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picture-uri-dark='file://$dark_live_target'
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picture-uri='file://$light_live_target'
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[org/gnome/desktop/screensaver]
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picture-uri='file://$dark_live_target'
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EOF
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# Remove the uniquely named copies of previously chosen wallpapers
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find "$TARGET_DIR" -name 'dark-tmp-*.jpg' ! -name "dark-tmp-$timestamp.jpg" -delete
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find "$TARGET_DIR" -name 'light-tmp-*.jpg' ! -name "light-tmp-$timestamp.jpg" -delete
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echo "Installed as: $TARGET_DIR/{dark,light}.jpg"
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