wifi: add default block

wifi/README.md

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+# wifi
+
+Show the strength of your wifi connection.
+If no instance is specified, wlan0 is used.
+
+![](wifi.png)
+
+# Config
+
+```
+[wifi]
+command=$SCRIPT_DIR/wifi
+label=wifi:
+#instance=wlp3s0
+interval=60
+```

wifi/i3blocks.conf

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+[wifi]
+command=$SCRIPT_DIR/wifi
+label=wifi:
+#instance=wlp3s0
+interval=60

wifi/wifi

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+#!/bin/bash
+# Copyright (C) 2014 Alexander Keller <[email protected]>
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#------------------------------------------------------------------------
+
+INTERFACE="${BLOCK_INSTANCE:-wlan0}"
+
+#------------------------------------------------------------------------
+
+# As per #36 -- It is transparent: e.g. if the machine has no battery or wireless
+# connection (think desktop), the corresponding block should not be displayed.
+[[ ! -d /sys/class/net/${INTERFACE}/wireless ]] ||
+    [[ "$(cat /sys/class/net/$INTERFACE/operstate)" = 'down' ]] && exit
+
+#------------------------------------------------------------------------
+
+QUALITY=$(grep $INTERFACE /proc/net/wireless | awk '{ print int($3 * 100 / 70) }')
+
+#------------------------------------------------------------------------
+
+echo $QUALITY% # full text
+echo $QUALITY% # short text
+
+# color
+if [[ $QUALITY -ge 80 ]]; then
+    echo "#00FF00"
+elif [[ $QUALITY -ge 60 ]]; then
+    echo "#FFF600"
+elif [[ $QUALITY -ge 40 ]]; then
+    echo "#FFAE00"
+else
+    echo "#FF0000"
+fi