window switcher, bash, yad UI

wlist.sh

#!/bin/bash
#######################################################
# Description:                                        #
#   bash script to list and focus windows             #
#   via yad list UI  Misko_2083                       #
#######################################################

ERR(){ echo "ERROR: $1" 1>&2; }

declare -i DEPCOUNT=0
for DEP in /usr/bin/{xdotool,perl,wmctrl,yad,convert,xprop,awk,xargs,iconv} /bin/{rm,echo,sed}; {
    [ -x "$DEP" ] || {
        ERR "$LINENO Dependency '$DEP' not met."
        DEPCOUNT+=1
        }
}
[ $DEPCOUNT -eq 0 ] || exit 1

VERSION=`yad --version | awk '{ print $1 }'`
verlte() {
    [  "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
}

verlt() {
    [ "$1" = "$2" ] && return 1 || verlte $1 $2
}

if verlt $VERSION 0.38.2; then
   yad --text=" The version of yad installed is too old for to run this program, \n Please upgrade yad to a version higher than 0.38.2   " \
       --button="gtk-close"
   exit
fi

# Ensures only one instance of this scipt can start
# Also, if there is another yad window closes it
if [[ $(pgrep -c $(basename $0)) -ne 1 ]]; then
   pids="$(xdotool search --class "wlist")"
   wpid="$(xdotool getwindowfocus)"

   for pid in $pids; do
        # Compares window class pid with the pid of a window in focus
        if [[ "$pid" == "$wpid" ]]; then
           xdotool windowunmap $pid
           exit 1
        fi
   done
fi

# Check if there are windows present
wmctrl -l | while read -a A; do
             if [[ "${A[1]}" -ge "0" ]];then
                exit 1
             fi
           done
if [[ "$?" -eq 0 ]]; then
              yad --text="Window list:\nNo windows to show." \
              --no-buttons \
              --undecorated \
              --close-on-unfocus \
              --on-top \
              --skip-taskbar \
              --mouse \
              --sticky \
              --class="wlist"
    exit 0
fi
#######################################################
# Note:                                               #
# to show the icon for the "zathura" application      #
# create a config file ~/.config/zathura/zathurarc    #
# with contents: set window-icon /path/to/zathura.png #
# there is a manual page for zathurarc: man zathurarc #
#######################################################

# Activation method can be select or dclick
# select - focus window on selection
# dclick - focus window on double-click
ACTION=select

gtkIcons=Default

# Get Icon Theme name Mate desktop
gtkIcons=$(gsettings get org.mate.interface icon-theme)
gtkIcons=${gtkIcons//"'"}

# Get icon theme bunsen hidrogen
# gtkIcons="$(awk -F'"' '/^gtk-icon-theme-name/{print $2}' ~/.gtkrc-2.0)"

# Get Icon Theme Name Xfce Desktop
# gtkIcons=$(xfconf-query -c xsettings -p /Net/IconThemeName)


#######################################################
# Temp Dir to store the icon cache:                   #
# This directory is used to store the icon cache      #
# Change it for your needs                            #
#######################################################

# Temp Dir to store the icon cache
TMPDIR="~/Desktop/wlist-icons/$gtkIcons"
if [[ ! -d "$TMPDIR" ]]
then
   mkdir -p "$TMPDIR"
fi

# Get active window id
ACTIVE_WIN_ID=$(xprop -root 32x '\t$0' _NET_ACTIVE_WINDOW | awk '{print $2}')

# With process substitution output from "wmctrl -l" is redirected here
# while loop reads  "win_id" and "display" variables
while read -r win_id display app text
  do
     # Skip sticky windows with display id -1
     [[ "$display" -eq "-1" ]] && continue
     
         # Get WM_CLASS X window property
         wm_class="$(xprop -id $win_id WM_CLASS | awk -F'"' '{print tolower($4)}')"

        if [[ ! -f $TMPDIR/$wm_class.png ]]
             then
                 # Converts icons to pam then uses imagemagick to convert to png and resize to 16x16
                 xprop -notype 32c -id $win_id _NET_WM_ICON \
                       |    perl -0777 -pe '@_=/\d+/g;
                       printf "P7\nWIDTH %d\nHEIGHT %d\nDEPTH 4\nMAXVAL 255\nTUPLTYPE RGB_ALPHA\nENDHDR\n", splice@_,0,2;
                       $_=pack "N*", @_;
                       s/(.)(...)/$2$1/gs' \
                       | convert pam:- -resize 16x16 $TMPDIR/$wm_class.png  2>/dev/null
                  if [[ $? -ne 0 ]] && [[ ! -f "$TMPDIR/$wm_class" ]]
                  then
                      NET_NAME=$(xprop -id $win_id _NET_WM_NAME | awk -F '"' '{print $2}')
                      echo "$NET_NAME" > "$TMPDIR/$wm_class"
                  fi
         fi

         # Extracts the application name from string
         app="${app##*'.'}"

         # makes active window row bold
         if [[ "$win_id" -eq "$ACTIVE_WIN_ID" ]]
         then
             #display="<b>$display</b>"
             app="<b>$app</b>"
             text="<b>$text</b>"
         fi

         # if WM_CLASS is a "Wrapper"
         if [[ "${wm_class}" == "Wrapper" ]]
         then
             # Get WM_CLASS X window property _NET_WM_NAME
             wm_class=$(xprop -id $win_id _NET_WM_NAME | awk -F '"' '{print $2}')

             # print to yad columns
             if [[ "$wm_class" -ne "" ]]
             then
                 echo "$wm_class"
             else
                 echo "xfwm4"
             fi
             echo "$win_id"                         # We use this one for select-action (hidden column)
             echo "$text" | sed "s/\&/\&amp;/g" |   # escape ampersand, yad doesn't like it
             iconv -c -t UTF-8                      # convert characters to utf-8, yad again
             echo "$display ${wm_class}" | sed "s/\&/\&amp;/g"
         else
             if [[ -f $TMPDIR/$wm_class.png  ]]
               then
                  echo "$TMPDIR/$wm_class.png"
             elif [[ -s "$TMPDIR/$wm_class" ]]
                then
                 cat "$TMPDIR/$wm_class"
             else 
                 echo "$wm_class"
             fi
             # print to yad columns
             echo "$win_id"                         # We use this one for select-action (hidden column)
             echo "$text" | sed "s/\&/\&amp;/g" |   # escape ampersand, yad doesn't like it
             iconv -c -t UTF-8                      # convert characters to utf-8, yad again
             echo "$display ${app}" | sed "s/\&/\&amp;/g"
         fi

done < <(wmctrl -l -x \
        | awk '{$4="";
                if($3=="zathura.Zathura")
                    print $1, $2, substr($0, index($0,$5), 50);
                else
                    print $1, $2, $3, substr($0, index($0,$5), 50);}') \
        | yad --list \
              --title="WList" \
              --column="icon":IMG \
              --column="win_id" \
              --column="title" \
              --column="display / app" \
              --width="500" \
              --height="450" \
              --hide-column="2" \
              --$ACTION-action="sh -c \"echo %s | cut -d ' ' -f 2 2>&1 | xargs  xdotool windowactivate -- \"" \
              --no-buttons  \
              --search-column=3 \
              --window-icon="mate-desktop" \
              --undecorated \
              --close-on-unfocus \
              --on-top \
              --skip-taskbar \
              --mouse \
              --sticky \
              --class="wlist"

exit 0