Merge pull request #1566 from Joshfindit/patch-1

Update bandwidth_primary.1s.sh

Author: sprak3000

Network/bandwidth_primary.1s.sh

@@ -4,16 +4,13 @@
 # <xbar.version>v0.0.1</xbar.version>
 # <xbar.author>Kaspars Mickevics</xbar.author>
 # <xbar.author.github>fxlv</xbar.author.github>
-# <xbar.desc>Displays bandwidth usage for the primary interface in Megabits/s</xbar.desc>
+# <xbar.desc>Displays bandwidth usage for a network interface in Megabits/s</xbar.desc>
 # <xbar.dependencies>ifstat</xbar.dependencies>
 # <xbar.image>https://cloud.githubusercontent.com/assets/2462211/12748504/584bbcea-c9b3-11e5-8109-ad8fdcefdc75.png</xbar.image>
+# <xbar.var>string(VAR_NETWORK_INTERFACE="en0"): The interface to track (Usual interface for MacOS wifi is en0)</xbar.var>
 
 # based on bandwidth.1s.sh by Ant Cosentino
 
-# only gather stats from interface en0
-# no need to samlpe unused interfaces
-INTERFACE="en0"
-
 
 if [ ! -e /usr/local/bin/ifstat ]; then
     echo "Please install ifstat or change the path to it in the script."
@@ -26,10 +23,10 @@ function kilo_to_mega {
 }
 
 function get_ifstat {
-    interface=$1
+    IFSTAT_INTERFACE=$1
     # 1 sample for 0.5 second interval
     # outputs two values (in/out) in kilobits per second
-    /usr/local/bin/ifstat -n -w -i "${interface}" -b 0.5 1 | tail -n 1
+    /usr/local/bin/ifstat -n -w -i "${IFSTAT_INTERFACE}" -b 0.5 1 | tail -n 1
 }
 
 function print_ifstat {
@@ -41,5 +38,5 @@ function print_ifstat {
 
 }
 
-print_ifstat "$(get_ifstat ${INTERFACE})"
+print_ifstat "$(get_ifstat ${VAR_NETWORK_INTERFACE})"
 echo "---"