#!/bin/sh

cmd_exists () {
    if which "$1" >/dev/null 2>&1; then
        return 0;
    else
        return 1;
    fi;
}

fork () {
    ( "$@" >/dev/null 2>&1 & )
}

echo "Starting new session"

DATE=$(date "+%Y%m%d_%H%M%S")
# track xsession errors
mv ~/.xsession-errors ~/.xsession-errors_${DATE};
ln -sf ~/.xsession-errors_${DATE} ~/.xsession-errors-current;
# delete old xsession error files
find ~/ -maxdepth 1 -mindepth 1 -type f \
    -iname '.xsession-errors_*' -ctime +30 -delete;

if locale -a |grep -qi en_US.utf8; then
    LANG="en_US.UTF-8"
else
    LANG=C
fi;
export LANG

HOSTNAME=$(hostname)

if [ -d ~/tmp ]; then
   export TMPDIR=$(echo ~/tmp)
fi;

# No clue why this has changed from Alt_R to Down, but we really want Down.
if ! xmodmap -pk|grep -qe '116.*Down'; then
    xmodmap -e 'keycode 116 = Super_L'
    xmodmap -e 'keycode 115 = Multi_key'
fi;
xmodmap -e 'clear mod4'
xmodmap -e 'add mod4 = Super_L Super_R'

if [ -e ~/.Xresources_$HOSTNAME ]; then
    xrdb -merge < ~/.Xresources_$HOSTNAME;
fi;

if [ -e ~/.xsession_$HOSTNAME ]; then
    . ~/.xsession_$HOSTNAME
fi;

# make a backup of the .Xauthority
if [ -e ~/.Xauthority ]; then
    cp -f .Xauthority .Xauthority.bak
fi

if [ -e ~/bin/screensaver ]; then
    ~/bin/screensaver on;
elif cmd_exists i3lock && cmd_exists xss-lock; then
    fork xss-lock -l -- ~/bin/locker
elif cmd_exists slock && cmd_exists xautolock; then
    fork xautolock -notifier true -bell 0 -locker slock;
    if cmd_exists xss-lock; then
        fork xss-lock -- xautolock -locknow;
    fi;
elif cmd_exists xscreensaver && [ -e ~/.xscreensaver ]; then
    fork XENVIRONMENT=~/.xscreensaver /usr/bin/xscreensaver;
elif cmd_exists xautolock; then
    fork xautolock -notifier true -bell 0;
    if cmd_exists xss-lock; then
        fork xss-lock -- xautolock -locknow;
    fi;
fi;

if cmd_exists redshift; then
    fork redshift;
fi;

if cmd_exists mpd && [ -e ~/.mpdconf ]; then
    fork mpd;
    MPD_HOST=$(awk '/^bind_to_address/{print $2}' ~/.mpdconf|sed "s|~|$HOME|; s/^\"//; s/\"$//; ");
    export MPD_HOST;
elif cmd_exists mopidy && [ -e ~/.config/mopidy/mopidy.conf ]; then
    fork mopidy;
fi;

if [ -x /sbin/iw ] && cmd_exists nm-applet && /sbin/iw list|grep -q '^Wiphy'; then
    fork nm-applet;
fi;

if cmd_exists i3; then
    if [ -x ~/.config/i3/build_config.sh ]; then
        ~/.config/i3/build_config.sh;
    fi;
    exec /usr/bin/i3;
else
    for prog in awesome ion3 openbox stterm st rxvt rxvt-unicode xterm; do
        if cmd_exists $prog; then
            exec $(which $prog)
        fi
    done;
fi;