Add utility function to print horizontal "ruler"

Mostly for easier visual distinction and also for fun.

dotfiles/bash/main.bashrc

     __bashum_run_n "${1:-1}" xfce4-terminal
 }
 
+hr() {
+    #
+    # Make horizontal ruler
+    #
+    local i
+    local line
+    for i in $(seq 1 "$COLUMNS"); do
+        case $((i%10)) in
+            0)  line+='#' ;;
+            *)  line+='-' ;;
+        esac
+    done
+    echo "$line"
+    echo "$line"
+    echo "$line"
+}
+
 __bashum_run_n() {
     #
     # Run $2 in background $1 times