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backdrop-randomizer.in
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backdrop-randomizer.in
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#!/bin/bash
#
# shellcheck disable=1090,2016
#
# backdrop-randomizer
# By graysky <graysky AT archlinux DOT us>
#
# https://github.com/graysky2/backdrop-randomizer
#
# see manpage for usage
#
BLD="\e[01m"
RED="\e[01;31m"
GRN="\e[01;32m"
YLW="\e[01;33m"
NRM="\e[00m"
VERS="@VERSION@"
# make sure env var is setup correctly
[[ -z "$XDG_CONFIG_HOME" ]] && XDG_CONFIG_HOME="$HOME/.config"
cfg_file="$XDG_CONFIG_HOME/backdrop-randomizer.conf"
check() {
if [[ ! -f "$cfg_file" ]]; then
# create $XDG_CONFIG_HOME/backdrop-randomizer.conf
echo '------------------------------------------------------------'
echo ' No config file found so creating a fresh one.'
echo
cat <<EOF > "$XDG_CONFIG_HOME/backdrop-randomizer.conf"
#
# $XDG_CONFIG_HOME/backdrop-randomizer.conf
#
# For documentation see the backdrop-randomizer manpage.
#
# Provide the full path to pics to be used.
PIC_PATH=
# Uncomment and redefine if you want to find pics recursively.
#MAXDEPTH=1
# Uncomment and redefine if you want to provide an alternative
# location where the database of pics will reside.
# You _MUST_ have rw permissions to the dir you define!
#BD_DIR=/var/lib/backdrop-randomizer
# Uncomment and redefine if you want to provide an alternative
# location of the symlink that will be updated by this script.
# You _MUST_ have rw permissions to the dir you define!
#SLINK_DIR=/var/lib/backdrop-randomizer
EOF
echo ' Define the path to your pics via the PIC_PATH variable in'
echo ' $XDG_CONFIG_HOME/backdrop-randomizer.conf and try again.'
echo '------------------------------------------------------------'
exit 1
else
. "$cfg_file"
fi
# check each var for correctness
[[ -z "$MAXDEPTH" ]] && MAXDEPTH=1
result=$(echo "$MAXDEPTH" | grep -E '^[[:digit:]]+$')
if [ "$result" = "" ] ; then
echo 'Bad MAXDEPTH in $XDG_CONFIG_HOME/backdrop-randomizer.conf'
echo
echo 'You have defined a non-integer value.'
exit 1
fi
[[ -z "$BD_DIR" ]] && BD_DIR=$XDG_CONFIG_HOME
if [[ ! -w "$BD_DIR" ]]; then
echo "Bad BD_DIR in $XDG_CONFIG_HOME/backdrop-randomizer.conf"
echo
echo 'You have defined a path to which you cannot write.'
exit 1
fi
[[ -z "$SLINK_DIR" ]] && SLINK_DIR=$XDG_CONFIG_HOME
if [[ ! -w "$SLINK_DIR" ]]; then
echo "Bad SLINK_DIR in $XDG_CONFIG_HOME/backdrop-randomizer.conf"
echo
echo 'You have defined a path to which you cannot write.'
exit 1
fi
# use only one find command to both test for pics and to generate pic_database
pic_database="$BD_DIR/backdrop-randomizer.list"
[[ ! -f "$pic_database" ]] && find "${PIC_PATH}" -maxdepth "$MAXDEPTH" \
-name "*.jpg" -o -name "*.JPG" -o -name "*.png" -o -name "*.PNG" \
-o -name "*.gif" -o -name "*.GIF" > "$pic_database" 2>/dev/null
howmany=$(wc -l "$pic_database" | awk '{ print $1 }')
if [[ "$howmany" -eq 0 ]]; then
echo "Bad PIC_PATH in $XDG_CONFIG_HOME/backdrop-randomizer.conf"
echo
echo "You have defined a path that contains no pics and/or one that your user cannot access."
echo "Supported formats are: jpg, png, and gif."
# remove the empty file
rm -f "$pic_database"
exit 1
fi
# remove dups in database if they are present
uniques=$(gawk ' !x[$0]++' "$pic_database" | wc -l)
if [[ "$howmany" != "$uniques" ]]; then
gawk ' !x[$0]++' "$pic_database" > /tmp/.backdrop_nodups
mv /tmp/.backdrop_nodups "$pic_database"
howmany=$(wc -l "$pic_database" | awk '{ print $1 }')
fi
}
locked() {
# do not rotate if monitor is asleep or in standby
if xset q | grep -q "Monitor is Off" || xset q | grep -q "Monitor is Standby"; then
exit 0
fi
# do not rotate if screensaver is active or screen is locked
# for xfce4-screensaver
if [[ -n $(pidof xfce4-screensaver) ]] && [[ -x xfce4-screensaver-command ]]; then
xfce4-screensaver-command -q | grep -q "The screensaver is active" 2>/dev/null && exit 0
fi
# for xscreensaver
if [[ -n $(pidof xscreensaver) ]] && [[ -x xscreensaver-command ]]; then
xscreensaver-command -time | grep -q "screen blanked since" 2>/dev/null ||
xscreensaver-command -time | grep -q "screen locked since" 2>/dev/null &&
exit 0
xscreensaver-command -time | grep -q "screen blanked since" ||
xscreensaver-command -time | grep "screen locked since" 2>/dev/null &&
exit 0
fi
# for xlock
[[ -n $(pidof xlock) ]] && exit 0
}
stats() {
echo -e " ${BLD}Pics left before next db refresh: ${NRM}${GRN}$howmany${NRM}"
echo -e " ${BLD}Current: ${NRM}${GRN}$(readlink -f "$SLINK_DIR/backdrop-randomizer.jpg")${NRM}"
}
list() {
echo " Individual list of pics:"
cat "$pic_database"
}
cycle() {
find "${PIC_PATH}" -maxdepth "$MAXDEPTH" -name "*.jpg" -o -name "*.JPG" \
-o -name "*.png" -o -name "*.PNG" -o -name "*.gif" \
-o -name "*.GIF" > "$pic_database" 2>/dev/null
howmany=$(wc -l "$pic_database" | awk '{ print $1 }')
}
randomize() {
# two conditions:
# 1) 1 line left (one pic left) so use the pic and regenerate the list
# 2) 2 or more lines left so select a random number between 1 and $howmany
if [[ $howmany -eq 1 ]]; then
# condition 1 is true
useit=$(sed -n "1 p" "$pic_database") && filename=$(basename "$useit")
find "${PIC_PATH}" -maxdepth "$MAXDEPTH" -name "*.jpg" -o -name "*.JPG" \
-o -name "*.png" -o -name "*.PNG" -o -name "*.gif" \
-o -name "*.GIF" > "$pic_database"
# exclude the one we just picked to create the illusion that we NEVER repeat :)
sed -i "/$filename/d" "$pic_database"
ln -sf "$useit" "$SLINK_DIR"/backdrop-randomizer.jpg
[[ -n $(pidof xfdesktop) ]] && DISPLAY=:0.0 xfdesktop --reload
elif [[ $howmany -ge 2 ]]; then
# condition 2 is true
rndpick=1
while [[ $rndpick -lt 2 ]]; do
rndpick=$((RANDOM%howmany+1))
done
useit=$(sed -n "$rndpick p" "$pic_database") && filename=$(basename "$useit")
# exclude the one we just picked to create the illusion that we NEVER repeat :)
sed -i "/$filename/d" "$pic_database"
ln -sf "$useit" "$SLINK_DIR"/backdrop-randomizer.jpg
[[ -n $(pidof xfdesktop) ]] && DISPLAY=:0.0 xfdesktop --reload
fi
}
add() {
if [[ -z "$arg" ]]; then
echo -e "${RED}You must provide a supported image.${NRM}"
exit 1
fi
file=$(readlink -f "$arg")
if readlink -f "$file" | grep -E '.*jpg$|.*JPG$|.*gif$|.*GIF$|.*png$|.*PNG$'; then
# check for dups
if grep "$file" "$pic_database"; then
echo -e " ${RED}${file##*/}${NRM}${BLD} ---X not added since already present.${NRM}"
exit 1
fi
echo "$file" >> "$pic_database"
after=$(wc -l "$pic_database" | awk '{ print $1 }')
echo -e " ${GRN}${file##*/}${NRM}${BLD} ---> added to database.${NRM}"
echo -e " ${BLD}Database: ${NMR}${RED}$pic_database${NRM}${BLD} now contains ${NRM}${YLW}$after${NRM}${BLD} pics.${NRM}"
else
echo -e " ${BLD}Not a supported image file: ${NRM}${RED}${file##*/}${NRM}"
echo -e " ${BLD}Currently, only jpeg, gif, and png images are supported.${NRM}"
fi
}
case "$1" in
A|a)
check ; arg="$2" ; add ;;
C|c)
check ; cycle ; randomize ;;
L|l)
check ; list ;;
R|r)
check ; locked
# if not logged into X there is nothing to do
pgrep -u "$(whoami)" xfce4-session 1>/dev/null && randomize
;;
S|s)
check ; stats ;;
*)
check
echo -e "${RED}backdrop-randomizer v$VERS${NRM}"
echo
stats
echo
echo -e "${BLD} $0${NRM} ${GRN}{a|c|l|r|s}${NRM}"
echo
echo -e "${BLD} a) ${GRN}A${NRM}${BLD}dd the next token to database."
echo -e "${BLD} c) ${GRN}C${NRM}${BLD}lear the database and start anew.${NRM}"
echo -e "${BLD} l) ${GRN}L${NRM}${BLD}ist all pics in the database."
echo -e "${BLD} r) ${GRN}R${NRM}${BLD}andomly select a pic from the database and refresh xfdesktop."
echo -e "${BLD} s) ${GRN}S${NRM}${BLD}how database stats."
echo
echo -e " Add all new pics to the database: ${YLW}find -L /path/to/pics -type f -mtime -1 | xargs -n1 bdr a${NRM}"
;;
esac
# vim:set ts=2 sw=2 et: