#!/bin/sh
# speedwm-winnav
# Alt+tab navigation for speedwm
#
# This script is from the suckless.org website.
# I made the following changes to it:
# - POSIX compliant
# - Tab goes down, j/k to navigate
# - Removed class from $windows making it look nicer
# - Configuration file
# - dmenu center patch support
# - Other small improvements.

RESTORE() {
  if [ -e "${BINDIR}xmodmap" ]; then
		xmodmap -e "keycode 23 = Tab"
		xmodmap -e "keycode 116 = Down"

		# Vim
		xmodmap -e "keycode 44 = j"
		xmodmap -e "keycode 45 = k"
  fi
}

HAVE_GRID="true"

if [ -e "$HOME/.config/speedwm-de/global/config" ]; then
		. $HOME/.config/speedwm-de/global/config
else
		mkdir -p $HOME/.config/speedwm-de/global
		printf "HAVE_GRID=$HAVE_GRID # Whether or not to use the Grid argument. If you do not have the dmenu grid patch, set this to false. Doing so will disable grid." > $HOME/.config/speedwm-de/global/config
fi

if [ "$HAVE_GRID" = "true" ]; then
		GRIDNUM="1"
fi

if [ "$HAVE_GRID" = "true" ]; then
		GRIDARG="-g"
fi

case "$RUNLAUNCHER" in
"") RUNLAUNCHER=dmenu ;;
esac

BINDIR=$(cat /usr/share/speedwm-bindir)
DOTDIR=$HOME/.config/speedwm-de/winnav
POSITION="bottom" # top, bottom, center (your $RUNLAUNCHER must support center for this to work)

mkdir -p $HOME/.config/speedwm-de/winnav

# Create config if it does not exist.
if [ -e "$HOME/.config/speedwm-de/winnav/config" ]; then
		. $HOME/.config/speedwm-de/winnav/config
else
		printf "POSITION=$POSITION # top, bottom, center (Your installed $RUNLAUNCHER must support center (-c) for this to work)" > $HOME/.config/speedwm-de/winnav/config
fi

# Set position based on config
case "$POSITION" in
"bottom") POSARG="-b" ;;
"top") POSARG="" ;;
"center") POSARG="-c" ;;
esac

# Check if wmctrl is available
if [ -e "${BINDIR}wmctrl" ]; then
		echo "wmctrl found"

		case "$(wmctrl -xl | wc -l)" in
		"") echo "No clients found." ; exit 1 ;;
		"1") echo "One client running, will not open menu." ; exit 0 ;;
		esac
else
		echo "wmctrl not found, exiting." && exit 1
fi

SET() {
  if [ -e "${BINDIR}xmodmap" ]; then
		xmodmap -e "keycode 23 = Down"
		xmodmap -e "keycode 116 = Tab"

		# Vim
		xmodmap -e "keycode 44 = Down"
		xmodmap -e "keycode 45 = Up"
  fi
}

SET

windows=$(wmctrl -xl | tr -s '[:blank:]' | cut -d ' ' -f 3-3,5- | sed 's/^[a-zA-Z0-9-]*\.//' | sort | uniq)
echo "Windows are:\n $windows\n============================"
windows_class=$(echo $windows | awk '{ print $1 }')
echo "Class is:\n $windows_class\n============================"

# Add spaces to align the WM_NAMEs of the windows
max=$(echo "$windows" | awk '{cur=length($1); max=(cur>max?cur:max)} END{print max}')
echo "Max is:\n$max"

windows=$(echo "$windows" | \
              awk -v max="$max" \
                  '{cur=length($1); printf $1; \
                    for(i=0; i < max - cur + 1; i++) printf " "; \
                    $1 = ""; printf "%s\n", $0}')


target=$(printf "\n$windows" | cut -f 2- -d ' ' | sed 's/^ *//g' | $RUNLAUNCHER $POSARG -l 10 $GRIDARG $GRIDNUM -p "Which window?" | tr -s '[:blank:]' | sed "s/$class | //g")

case "$target" in
"") RESTORE && exit 0 ;;
esac

wmctrl -a "$target" && echo "Switched focus"

command -v xsetroot > /dev/null && xsetroot -name "fsignal:38"

RESTORE