create command caching script and added update widget to bar

scripts/bar.sh

@@ -13,6 +13,7 @@ icon_wifi=$(icon 048)
 icon_battery=$(icon 033)
 icon_battery_charging=$(icon 042)
 icon_clock=$(icon 018)
+icon_updates=$(icon 060)
 
 color_service_running="#A0A57E"
 color_service_stopped="#C37561"
@@ -81,6 +82,11 @@ clock() {
     echo -n "%{A:I "clock 1061":}$icon_clock $info%{A}"
 }
 
+updates() {
+    info=$(./cmdcache.sh 1200 checkupdates | wc -l)
+    echo -n "$icon_updates $info"
+}
+
 run_handler() {
     while read type param; do
         case $type in
@@ -94,7 +100,7 @@ run_handler() {
 
 
 while true; do
-    echo "%{l} $(music) $(services) $(diskspace)%{r}$(wifi) $(battery) $(clock) "
+    echo "%{l} $(music) $(services) $(diskspace)%{r}$(updates) $(wifi) $(battery) $(clock) "
     sleep 1
 done | lemonbar -g 1366x15 -f "Terminus:size=8","Stlarch:size=6:style=regular" -B "#88000000" | run_handler
 

scripts/cmdcache.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+#Arguments
+CMD=$2
+CACHE_TIME=$1
+
+#Constants
+TMPDIR="/tmp/cache"
+
+[ -d "$TMPDIR" ] || mkdir -p "$TMPDIR"
+
+HASH=$(echo "$CMD" | base64)
+CACHE_FILE="$TMPDIR/$HASH"
+
+if [ -f "$CACHE_FILE" ]; then
+    CACHE_AGE=$[ $(date +"%s") - $(stat -c "%Y" "$CACHE_FILE") ]
+    if [ $CACHE_AGE -lt $CACHE_TIME ]; then
+        cat "$CACHE_FILE"
+    else
+        $CMD | tee "$CACHE_FILE"
+    fi
+else
+    $CMD | tee "$CACHE_FILE"
+fi
+