run awesome in a nested window for testing

awmtt.sh

#!/usr/bin/env bash
# awmtt: awesomewm testing tool

#{{{ Usage
usage() {
  cat <<EOF
awmtt [ start | stop | restart | -h | -e | -t [ get | change | list | random ] ] [ -C /path/to/rc.lua ] [ -D display ] [ -S windowsize ]

  start			Spawn nested Awesome via Xephyr
  stop			Stops Xephyr
	all		Stop all instances of Xephyr 
  restart		Restart nested Awesome
  -N|--notest		Don't use a testfile but your actual rc.lua (i.e. $HOME/.config/awesome/rc.lua)
  -C|--config		Specify configuration file
  -D|--display		Specify the display to use (e.g. 1)
  -S|--size		Specify the window size
  -e|--execute		Execute command in nested Awesome
  -t|--theme		Control the current theme
	c|change	Change theme
	p|print		Print themename
	l|list		List available themes
	r|random	Choose random theme
  -h|--help		Show this help text
  
examples:
awmtt start -D 3 -C /etc/xdg/awesome/rc.lua -S 1280x800
awmtt -t change zenburn
awmtt start (uses defaults)

The defaults are -D 1 -C $HOME/.config/awesome/rc.lua.test -S 1024x640.

EOF
    exit 0
}
[ "$#" -lt 1 ] && usage
#}}}

#{{{ Utilities
awesome_pid() { pgrep -fn "/usr/bin/awesome"; }
xephyr_pid() { pgrep -f xephyr_$D; }
errorout() { echo "error: $*" >&2; exit 1; }
#}}}

#{{{ Executable check
AWESOME=$(which awesome)
XEPHYR=$(which Xephyr)
[[ -x "$AWESOME" ]] || errorout 'Please install Awesome first'
[[ -x "$XEPHYR" ]] || errorout 'Please install Xephyr first'
#}}}

#{{{ Default Variables
# Display and window size
D=1
SIZE="1024x640"
# Path to rc.lua
if [[ "$XDG_CONFIG_HOME" ]];then
    RC_FILE="$XDG_CONFIG_HOME"/awesome/rc.lua.test
else
    RC_FILE="$HOME"/.config/awesome/rc.lua.test
fi
[[ -f "$RC_FILE" ]] || cp /etc/xdg/awesome/rc.lua "$RC_FILE"
#}}}

#{{{ Hostname Check - this is probably only useful for me. I have the same rc.lua running on two different machines
HOSTNAME=$(cat /proc/sys/kernel/hostname)
#}}}
	    
#{{{ Functions
#{{{ Start function
start() {
    "$XEPHYR" -name xephyr_$D -ac -br -noreset -screen "$SIZE" :$D >/dev/null 2>&1 &
    sleep 1
    DISPLAY=:$D.0 "$AWESOME" -c "$RC_FILE" &
    sleep 1
    echo "Using display $D ($RC_FILE)"
    echo "$D: Awesome PID is $(awesome_pid)"
    echo "$D: Xephyr PID is $(xephyr_pid)"
}
#}}}
#{{{ Stop function
stop() {
    if [[ "$1" == all ]];then
	echo "Stopping all instances of Xephyr"
	kill $(pgrep Xephyr) >/dev/null 2>&1
    elif [[ $(xephyr_pid) ]];then
	echo "Stopping Xephyr for display $D"
	kill $(xephyr_pid)
    else
	echo "Xephyr is not running or you did not specify the correct display with -D"
	exit 0
    fi
}
#}}}
#{{{ Restart function
restart() { # TODO: Find a way to uniquely identify an awesome instance (without storing the PID in a file). Until then all instances spawned by this script are restarted...
    echo -n "Restarting Awesome... "
    for i in $(pgrep -f "/usr/bin/awesome"); do kill -s SIGHUP $i; done
}
#}}}
#{{{ Run function
run() {
    #shift
    DISPLAY=:$D.0 "$@" &
    LASTPID=$!
    echo "PID is $LASTPID"
}
#}}}
#{{{ Theme function
theme() {

    # List themes
    theme_list() { #TODO: list only directories
	if [[ -d $(dirname "$RC_FILE")/themes ]];then
	    ls /usr/share/awesome/themes $(dirname "$RC_FILE")/themes
	else
	    ls /usr/share/awesome/themes "$HOME"/.config/awesome/themes
	fi
    }    
    case "$1" in
	l|list) theme_list
		exit 0;;
    esac
    
    # Check for Beautiful library
    BEAUTIFUL=$(grep -c 'beautiful.init' "$RC_FILE")
    [[ "$BEAUTIFUL" -ge 1 ]] || errorout 'Could not detect theme library "beautiful". Exiting.'

    if [[ "$HOSTNAME" == laptop ]];then
	curtheme=$(grep "^themelap" "$RC_FILE" | awk -F\/ '{print $2}')
    elif [[ "$HOSTNAME" == htpc ]];then
	curtheme=$(grep "^themehtpc" "$RC_FILE" | awk -F\/ '{print $2}')
    else
	curtheme=$(grep -oP "[^\/]+(?=\/theme.lua)" "$RC_FILE")
    fi
    
    # Change theme
    theme_change() {

	if [[ "$HOSTNAME" == laptop ]];then
	    theme=themelap
	elif [[ "$HOSTNAME" == htpc ]];then
	    theme=themehtpc
	else
	    theme="^beautiful\.init"
	fi

	if [[ "$file" ]];then
	    echo "changing $curtheme to $file"
	    sed -i "/$theme.*\/theme\.lua\"/s/[^/]*\(\/theme\.lua\)/$file\1/" "$RC_FILE"
	else
	    echo "changing $curtheme to $2"
	    sed -i "/$theme.*\/theme\.lua\"/s/[^/]*\(\/theme\.lua\)/$2\1/" "$RC_FILE"
	fi
    }
    # Print themename
    theme_print() {
	echo "$curtheme"
    }
    # Select random theme and start Xephyr instance
    theme_random() {
        themes=$(ls -1 $(dirname "$RC_FILE")/themes /usr/share/awesome/themes | grep -vE '/home/|/usr/|icons|README')
	file=$(echo "$themes" | sort --random-sort | head -1)
	theme_change
	D=11 && start
	
    }
  
    case "$1" in
	c|change)   theme_change "${args[@]}" ;;
	p|print)    theme_print	    ;;
	r|random)   theme_random    ;;
	*)	    errorout "unrecognized option to -t";;
    esac
}
#}}}

#{{{ Parse options
parse_options() {

    while [[ -n "$1" ]];do
	case "$1" in
	    -N|--notest)	RC_FILE="$HOME"/.config/awesome/rc.lua ;;
	    -C|--config)	shift; RC_FILE="$1" ;;
	    -D|--display)	shift; D="$1"
				[[ ! "$D" =~ ^[0-9] ]] && errorout "$D is not a valid display number" ;;
	    -S|--size)		shift; SIZE="$1" ;;
	    -h|--help)		usage		;;
	    start)		input=start	;;
	    stop)		input=stop	;;
	    restart|reload)	input=restart	;;
	    -e|--execute)	input=run	;;
	    -t|--theme)		input=theme	;;
	    *)			args+=( "$1" )	;;
	esac
	shift
    done
  
}
#}}}
#}}}

#{{{ Main 
main() {

  case "$input" in
    start)	start "${args[@]}"	  ;;
    stop)	stop "${args[@]}"	  ;;
    restart)	restart "${args[@]}"	  ;;
    run)	run "${args[@]}"	  ;;
    theme)	theme "${args[@]}"	  ;;
    *)		echo "Option not recognized" ;;
  esac
  
}
#}}}

parse_options "$@"
main