Added code to only check for updates every 24 hours

.gitignore

@@ -1 +1,2 @@
 zshrc
+.lastcheck

.zshrc

@@ -1,9 +1,34 @@
 # Path to your oh-my-zsh configuration.
 ZSH=$HOME/.oh-my-zsh
 
-echo "Updating config"
+# Update config once every 24 hours
 cd $HOME/.zcustom
-git pull
+case "`uname`" in
+    Linux)
+        STATARGS="-c %Z"
+        ;;
+    Darwin)
+        STATARGS="-f %m"
+        ;;
+    *)
+        echo "Error! Unknown system `uname`"
+        exit 1
+        ;;
+esac
+if [ -f .lastcheck ]; then
+    # if it hasn't been touched in the last 24 hours
+    NOW=`date +%s`
+    LAST=`stat $STATARGS .lastcheck`
+    if [ $(($NOW - $LAST)) -gt 86400 ]; then
+        echo "Updating config"
+        git pull
+    fi
+else
+    # Doesn't exist
+    touch .lastcheck
+    echo "Updating config"
+    git pull
+fi
 cd
 
 # Aliases