Bash script to update cursor settings in X database, gtk2 and gtk3

fix-cursor

#!/bin/bash

# Identifies which source contains the values that should be applied to all other sources
#
# Valid values:
# gtk3          GTK3 configuration / dconf
#               Supports cursor theme and size
# gtk2          GTK2 configuration (uses gconftool-2)
#               Supports cursor theme and size
# xdefaults     Reads values from ~/.Xdefaults
#               Supports only cursor theme, size will be the default
read_from="gtk3"

# If this value is 1 the X server database will be updated
update_xrdb="1"
# If this value is 1 the gtk2 settings will be updated
update_gtk2="1"
# If this value is 1 the gtk3 settings will be updated
update_gtk3="1"

# default values
cursor=""
cursor_size="32"

#
# Support functions
#

# Replace a line in a file
function updfile(){
  file=$1
  remove=$2
  add=$3

  content=$(cat $file|grep -v $remove)
  echo -e "$content\n$add" > $file
}

#
# Main script
#


# read current values
case $read_from in
    "gtk3")
        cursor=$(gsettings get org.gnome.desktop.interface cursor-theme|tr -d "'")
        cursor_size=$(gsettings get org.gnome.desktop.interface cursor-size|tr -d "'")
        ;;
    "gtk2")
        cursor=$(gconftool-2 -g /desktop/gnome/peripherals/mouse/cursor_theme)
        cursor_size=$(gconftool-2 -g /desktop/gnome/peripherals/mouse/cursor_size)
        ;;
    "xdefaults")

        ;;
    "*")
        echo "Unknown source $read_from. Please choose a valid value."
        exit 1
        ;;
esac

# Apply value to all targets, if possible

if [ \( -n $(which xrdb) \) -a \( $update_xrdb = "1" \) ]; then
    echo "updating xrdb settings"
    updfile .Xdefaults Xcursor.theme "Xcursor.theme: $cursor"
    xrdb -merge .Xdefaults
fi

if [ \( -n $(which gconftool-2) \) -a \( $update_gtk2 = "1" \) ]; then
    echo "updating gtk2 settings"
    gconftool-2 --type string -s /desktop/gnome/peripherals/mouse/cursor_theme $cursor
    gconftool-2 --type int -s /desktop/gnome/peripherals/mouse/cursor_size $cursor_size
fi

if [ \( -n $(which gsettings) \) -a \( $update_gtk3 = "1" \) ]; then
    echo "updating gtk3 settings"
    gsettings set org.gnome.desktop.interface cursor-theme $cursor
    gsettings set org.gnome.desktop.interface cursor-size $cursor_size
fi