xmodmap-toggle

#!/bin/bash

# Brief:
#   This is a shell script file for switching keymap via xmodmap quickly
#
# Tips:
#   1. keycode can be found via command 'xev'
#   2. xmodmap -pm  #print modifier map
#   3. xmodmap -pk  #print keymap table
#   4. disable key for nothing: keycode 50 = 0x0000
#
# Notice:
#   dconf key 'alt-tab-next-window' and 'alt-tab-prev-window' will not work but the value is
#   still be there when logout or reboot, therefore these keys must be reset then overwrite again.
#
# Params:
#   1. option $1, value: "xmode" "dconf" etc.
#     when $1 is "xmod" it will overwirte the xmodmap keys
#     when $1 is "dconf" it will overwirte the dconf keys
#   2. option $2, value: "swap" "default" etc.
#     when $2 is "swap" it will overwrite keys or reset default

########################################################################
#=> common libs
########################################################################
source "${HOME}/CodeHub/SHELL/libs/bootstrap.sh"

# My notebook keymap 
# 37    	0xffe3 (Control_L)	0x0000 (NoSymbol)	0xffe3 (Control_L)	
# 50    	0xffe1 (Shift_L)	0x0000 (NoSymbol)	0xffe1 (Shift_L)	
# 64    	0xffe9 (Alt_L)	0xffe7 (Meta_L)	0xffe9 (Alt_L)	0xffe7 (Meta_L)	
# 66    	0xffe5 (Caps_Lock)	0x0000 (NoSymbol)	0xffe5 (Caps_Lock)	
# 105    	0xffe4 (Control_R)	0x0000 (NoSymbol)	0xffe4 (Control_R)	
# 108    	0xffea (Alt_R)	0xffe8 (Meta_R)	0xffea (Alt_R)	0xffe8 (Meta_R)	
# 133    	0xffeb (Super_L)	0x0000 (NoSymbol)	0xffeb (Super_L)	
#
# shift     Shift_L (0x32),  Shift_R (0x3e)
# lock      Caps_Lock (0x42)
# control   Control_L (0x25),  Control_R (0x69)
# mod1      Alt_L (0x40),  Alt_R (0x6c),  Meta_L (0xcd)
# mod2      Num_Lock (0x4d)
# mod3      
# mod4      Super_L (0x85),  Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)
# mod5      ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)

# function getxmodmapcmd start ================
function getxmodmapcmd() {
DEFAULTMAPS="
!default keymap
keycode 9   = Escape
keycode 37  = Control_L
keycode 64  = Alt_L Meta_L
keycode 66  = Caps_Lock
keycode 76  = F10
keycode 108 = Alt_R Meta_R
keycode 133 = Super_L
keycode 135 = Menu
"
SWAPMAPS="
!swap keymap
keycode 9   = Caps_Lock
keycode 37  = Super_L
keycode 64  = Control_L
keycode 66  = Escape
keycode 76  = Menu
keycode 108 = F10
keycode 133 = Alt_L Meta_L
keycode 135 = Alt_R Meta_R
"

TEMP=
case $1 in
    swap)
        TEMP="$SWAPMAPS"
        ;;
    default)
        TEMP="$DEFAULTMAPS"
        ;;
    *) 
        echo
        exit 1
        ;;
esac


TEMPLATE="!customkeymap

clear control
clear mod1
clear mod4
clear lock
clear shift

"$TEMP"

add control = Control_L Control_R
add mod1    = Alt_L Meta_L Alt_R
add mod4    = Super_L
add lock    = Caps_Lock
add shift   = Shift_L Shift_R
"
echo "${TEMPLATE}"
}
# function getxmodmapcmd end ================

########################################################################
#=> main code here
########################################################################
# 1.xmodmap keymap handle
FILENAME="${HOME}/.Xmodmap"

TAG=
[[ -n $(sed -n '/default keymap/p' $FILENAME) ]] && TAG="swap" || TAG="default"

if [[ -n $2 ]]; then
    TAG=$2
fi

if [[ -z $1 || $1 == "xmod" ]]; then
    CMDSTR=$(getxmodmapcmd $TAG)

    if [[ -n "$CMDSTR" ]]; then
        sed -i '/customkeymap/,$d' "$FILENAME"
        echo "$CMDSTR" >> "$FILENAME"
        xmodmap "$FILENAME"
    fi

fi

# 2.dconf keyamp change about unity switcher
if [[ -z $1 || $1 == "dconf" ]]; then

    PROFILE_KEYMAP="
    /org/compiz/profiles/unity/plugins/unityshell/alt-tab-forward,<Alt>Tab,<Control>Tab
    /org/compiz/profiles/unity/plugins/unityshell/alt-tab-prev,<Alt><Shift>Tab,<Control><Shift>Tab
    /org/compiz/profiles/unity/plugins/unityshell/alt-tab-next-window,<Alt>grave,<Control>grave
    /org/compiz/profiles/unity/plugins/unityshell/alt-tab-prev-window,<Shift><Alt>asciitilde,<Control><Shift>grave
    "
    for LINE in $(echo "$PROFILE_KEYMAP"); do
        declare -a ARR=($(explode $LINE ","))
        KEY=${ARR[0]}
        [[ $TAG == "swap" ]] && VAL=${ARR[2]} || VAL=${ARR[1]}
        dconf write "$KEY" "'$VAL'"
    done

fi