generate_i3lock_wallpaper.sh

#!/usr/bin/env bash

#####
#   Generate a PNG file to use in i3lock
#       we have 2 monitors
#           1. resolution 1440x2560 at offset +0+0
#           2. resolution 1920x1200 at offset +1440+1100
#####

# get 2 random files from this folder
DIRECTORY=~/.config/variety/Favorites/
# name of the output image
OUTPUT=~/Pictures/Wallpaper/lock.png

PIC1=$DIRECTORY$(ls $DIRECTORY | shuf -n 1)
PIC2=$DIRECTORY$(ls $DIRECTORY | shuf -n 1)

INFO1=$(printf %q "$(identify $PIC1 | awk '{print $1,$3}')")
INFO2=$(printf %q "$(identify $PIC2 | awk '{print $1,$3}')")

# monitor info can be taken by calling
# xrandr | awk '$2=="connected"{print $3}'

# MONITOR_1_SIZE='1440x2560'
# MONITOR_1_OFFS='+0+0'
# 
# MONITOR_2_SIZE='1920x1200'
# MONITOR_2_OFFS='+1440+1100'

# or we can auto-generate variables HEAD_#_SIZE and HEAD_#_OFFS from the xrandr output
source <(\
xrandr | awk -F' |x|+' 'BEGIN{cnt=1} $2=="connected"{
    print "HEAD_" cnt "_SIZE=\"" $3 "x" $4 "\""
    print "HEAD_" cnt "_OFFS=\"+" $5 "+" $6 "\""
    ++cnt
    }'
)

# TODO: change the label position
convert \
    \( $PIC1 -resize $HEAD_1_SIZE^ -gravity Center -extent $HEAD_1_SIZE -repage $HEAD_1_OFFS \) \
    \( $PIC2 -resize $HEAD_2_SIZE^ -gravity Center -extent $HEAD_2_SIZE -repage $HEAD_2_OFFS \) \
    \( -background black -fill lime -size 1920x100 label:"$INFO1" -repage +1440+0 \) \
    \( -background black -fill lime -size 1920x100 label:"$INFO2" -repage +1440+1000 \) \
    -background None -layers merge $OUTPUT
 
identify $OUTPUT