mxfb-bg-rotate

#! /bin/bash

#mx-fb-bg-rotation  v1.0, released April 2021. 
#A script by the MX Linux Dev Team, to set background rotation in fluxbox.

TEXTDOMAINDIR=/usr/share/locale
export TEXTDOMAIN="mxfb-accessories"

DIALOG="yad --center --window-icon=/usr/share/icons/mxflux.png"

refresh()
{
	if pgrep -u $(id -u)  -x idesk >/dev/null; then
       idesktoggle idesk refresh
    fi
}

set_background_rotation()
{
	local conf="$HOME/.ideskrc"
	local source="/usr/share/backgrounds"
	local delay=5
	local mode=scale
	local cb_mode="scale\!stretch\!center\!fit\!mirror" 

	if [ -d "$HOME/.fluxbox/backgrounds/." ]; then
			source="$HOME/.fluxbox/backgrounds"
	fi

	eval declare -A HASH=( $(sed -nr '/^[[:space:]]*Background[.](Delay|Mode|Source):[[:space:]]*(.*)[[:space:]]*$/{ s//[\1]="\2"/p}' ~/.ideskrc ) )

	# echo "${!HASH[@]}"  ;echo "${HASH[@]@Q}"
	
	[ -n "${HASH[Delay]}"  ] && delay="${HASH[Delay]}"   && delay="${delay//[^0-9]}"
	[ -n "${HASH[Mode]}"   ] && mode="${HASH[Mode]}"     && cb_mode="${cb_mode/${mode,,}/^${mode,,}}"
	[ -n "${HASH[Source]}" ] && source="${HASH[Source]}"
	
	CFG="$($DIALOG --width=400 \
			--title=$"Set background rotation" \
			--text=$"No rotation: Delay = 0" \
			--text-align=center \
			--form \
			--field=$"Delay (mins)":NUM    "${delay}\!0..1440\!1\0" \
			--field=$"Image folder"":MDIR" "$source"  \
			--field=$"Image mode"":CB"     "$cb_mode" 2>/dev/null)"

	[  $?  -ne 0 ] && return 

	# read cfg values
	IFS='|' read -r new_delay new_source new_mode <<<$CFG

  new_mode="${new_mode,,}" 
  new_mode="${new_mode^}"    
  # update ideskrc values
  sed -ri  \
		-e '/^([[:space:]]*Background[.]Delay:).*/s%%\1 '"$new_delay"'%'    \
		-e '/^([[:space:]]*Background[.]Mode:).*/s%%\1 '"$new_mode"'%'    \
		-e '/^([[:space:]]*Background[.]Source:).*/s%%\1 '"$new_source"'%' \
		$conf

   refresh
   
}

set_background_rotation