Consolidate measure speed script (#188)

* remove old net speed scripts

* add reworked net-speed script

* add space between rate and speed suffix

it is easier to parse visually

* only use intervals greater zero

* add ifaces examples

* catch negativ byte count

happens when the counter resets

1 files changed, 79 insertions, 0 deletions

diff --git a/contrib/net-speed.sh b/contrib/net-speed.sh
new file mode 100755
index 0000000..71a563f
--- /dev/null
+++ b/contrib/net-speed.sh
@@ -0,0 +1,79 @@
+#!/bin/sh
+
+# Authors:
+# - Moritz Warning <moritzwarning@web.de> (2016)
+# - Zhong Jianxin <azuwis@gmail.com> (2014)
+#
+# See file LICENSE at the project root directory for license information.
+#
+# i3status.conf should contain:
+# general {
+#   output_format = i3bar
+# }
+#
+# i3 config looks like this:
+# bar {
+#   status_command exec /usr/share/doc/i3status/contrib/net-speed.sh
+# }
+#
+# Single interface:
+# ifaces="eth0"
+#
+# Multiple interfaces:
+# ifaces="eth0 wlan0"
+#
+
+# Auto detect interfaces
+ifaces=$(ls /sys/class/net | grep -E '^(eth|wlan|enp|wlp)')
+
+last_time=0
+last_rx=0
+last_tx=0
+rate=""
+
+readable() {
+  local bytes=$1
+  local kib=$(( bytes >> 10 ))
+  if [ $kib -lt 0 ]; then
+    echo "? K"
+  elif [ $kib -gt 1024 ]; then
+    local mib_int=$(( kib >> 10 ))
+    local mib_dec=$(( kib % 1024 * 976 / 10000 ))
+    if [ "$mib_dec" -lt 10 ]; then
+      mib_dec="0${mib_dec}"
+    fi
+    echo "${mib_int}.${mib_dec} M"
+  else
+    echo "${kib} K"
+  fi
+}
+
+update_rate() {
+  local time=$(date +%s)
+  local rx=0 tx=0 tmp_rx tmp_tx
+
+  for iface in $ifaces; do
+    read tmp_rx < "/sys/class/net/${iface}/statistics/rx_bytes"
+    read tmp_tx < "/sys/class/net/${iface}/statistics/tx_bytes"
+    rx=$(( rx + tmp_rx ))
+    tx=$(( tx + tmp_tx ))
+  done
+
+  local interval=$(( $time - $last_time ))
+  if [ $interval -gt 0 ]; then
+    rate="$(readable $(( (rx - last_rx) / interval )))↓ $(readable $(( (tx - last_tx) / interval )))↑"
+  else
+    rate=""
+  fi
+
+  last_time=$time
+  last_rx=$rx
+  last_tx=$tx
+}
+
+i3status | (read line && echo "$line" && read line && echo "$line" && read line && echo "$line" && update_rate && while :
+do
+  read line
+  update_rate
+  echo ",[{\"full_text\":\"${rate}\" },${line#,\[}" || exit 1
+done)