Create script that determines which interface is currently being used

[HokieGeek]

This will be very useful for displaying info on conky

[HokieGeek]

ip link show up will display all of the known interfaces, but that includes loopback

[HokieGeek]

For reference, within conky I will probably do something along the lines of:

${execpi 3600 $HOME/.bin/current-ip-interface.sh}

[HokieGeek]

Ok, this should take care of it:

#!/bin/sh
ip link show up | egrep '^[0-9]*:' | awk -F: '$2 !~ /lo/ { sub("^ *", "", $2); print $2 }'

Known problem: What if multiple interfaces match?

[HokieGeek]

You know what, what if we make this a conky-specific script that returns all of the config values necessary for the given interface?

#!/usr/bin/python
import tempfile
import os

# Retrieve interfaces
tempFile = tempfile.NamedTemporaryFile()
os.system("ip link show up | egrep '^[0-9]*:' | awk -F: '$2 !~ /lo/ { sub("^ *", "", $2); print $2 }' > %s", tempFile.name)
interfaces = [line.strip() for line in tempFile]
tempFile.close()

# For each interface, generate conky output
if len(interfaces) == 0
    #^fg(\#FF0000)No connection^fg(\#FFFFFF)
else
    for interface in interfaces
        # if is wireless
            # TODO
        # else
            #TODO

[HokieGeek]

Remember not to print with newlines (print(______, end="")) and the very last thing sent out should be a \

[HokieGeek]

Kinda bored at work, so:

Fixing this line:

os.system("ip link show up | egrep '^[0-9]*:' | awk -F: '$2 !~ /lo/ { sub(\"^ *\", \"\", $2); print $2 }' > %s", tempFile.name)

And fleshing this out:

# For each interface, generate conky output
for interface in interfaces
    print("${if_up %s}\\", interface, end="")
    if interface[0] == "w"
        print("${wireless_essid %s} \\", interface, end="")
        print("^fg(\\#9F0AC4)\\", end="")
        print("${if_match ${wireless_link_qual_perc %s} >= 95}^i($HOME/.conky/imgs/wifi_100.xbm)${else}\\", interface, end="")
        print("${if_match ${wireless_link_qual_perc %s} >= 75}^i($HOME/.conky/imgs/wifi_75.xbm)${else}\\", interface, end="")
        print("${if_match ${wireless_link_qual_perc %s} >= 50}^i($HOME/.conky/imgs/wifi_50.xbm)${else}\\", interface, end="")
        print("^i($HOME/.conky/imgs/wifi_25.xbm)\\", end="")
        print("${endif}${endif}${endif}\\", end="")
        print("^fg(\\#FFFFFF) \\", end="")
    elif interface[0] == "e"
        #TODO: print("^i($HOME/.conky/imgs/ethernet.xbm)\\", end="")
        #TODO: print("^fg(\\#006400)^i(DOWN) ${downspeed %s}^fg(\\#FFFFFF) \\", interface, end="")
        #TODO: print("^fg(\\#FF0000)^i(UP) ${upspeed %s}^fg(\\#FFFFFF) \\", interface, end="")
    print("^fg(\\#606060)${addr %s}^fg(\\#FFFFFF) \\", interface, end="")
    print("${endif}\\", end="")

# Lastly, output the external IP
print("^fg(\\#606060) (${exec wget -q -O /dev/stdout http://checkip.dyndns.org/ | cut -d : -f 2- | cut -d \\< -f -1 | awk '{ print $1 }'})^fg(\\#FFFFFF)\\", end="")

[HokieGeek]

Research these guys (http://conky.sourceforge.net/variables.html):

• ${gw_iface}
• ${gw_ip}
• ${if_gw}

[HokieGeek]

You idiot. If you're printing all of this in a single line, you don't need all of those backslashes!