#! /bin/sh

## Syntax:
##   # wifi [<place>]
##
## If no argument is provided, print out a list of all known places, along
## with the corresponding essid. The more recent places will be shown first,
## so you can |head(1) the output if there are many.
## If you provide an place name, it will be looked up and the parameters that
## were recorded for that place will be applied.
##
## Other possible syntax:
##   # wifilist
##
## Checks the available networks against the ones you know.
##
## Places definitions are stored in /etc/network/foo, with the following
## kind of contents:
##     essid "My Home"
##     key 0123456789
##
## Any argument that is valid for iwconfig(8) may be used.
##
## Author: davux <da@weeno.net>


#IFACES="eth0 wifi0"
IFACES="wlan0"
DIR="/etc/network/wlan"

for iface in $IFACES; do
    ifconfig "$iface" up
done

if [ `basename "$0"` = 'wifilist' ]; then
    for iface in $IFACES; do
        iwlist "$iface" scan | /bin/grep -i 'quality\|essid' | xargs | sed 's/Quality/\n&/g'
    done
    exit
fi

usage() {
    example="$1"
    name=`basename "$0"`
    echo ''
    echo "Usage: $name <place>"
    echo "Example: $name $example"
    echo ''
}

draw_chart() {
    dir="$1"
    off=''
    color=''
    underl=''
    echo "$color  ___________________________________________________$off" >&2
    printf " $color|$underl %-20s |  %-25s $off$color|"'\n' '        Place' '        ESSID' >&2
    grep -v '^#' `ls -t "$dir"/*` | grep essid | sed 's|'"$dir"'/\([^:]*\):essid \(.*\)|\1 \2|' | xargs printf " $color|$off %-20s $color|$off  %-25s $color|$off"'\n'
    echo " $color"'|'"______________________|____________________________$color|$off" >&2
}

main_iface=`echo "$IFACES" | sed 's/ .*//'`
if [ "$1" ]; then
    for iface in $IFACES; do
        ifdown "$iface" 2> /dev/null
        ifconfig "$iface" up -promisc
        iwconfig "$iface" key off mode Managed
    done
    killall -q dhclient{,3}
    sleep 1
    path="$DIR/$1"
    if [ -r "$path" ]; then
        shift
        grep -v '^[ 	]*#' "$path" | xargs echo iwconfig "$main_iface" $@
        grep -v '^[ 	]*#' "$path" | xargs iwconfig "$main_iface" $@
	touch "$path"
    else
        echo "E: Could not find profile '$1' in '$DIR'." >&2
	exit 1
    fi
else
    draw_chart "$DIR"
    first=`ls -t "$DIR"/* | head -n1 | xargs basename`
    usage "$first" >&2
fi