use pv for large files

files/md5sum-update

@@ -27,6 +27,7 @@ for ((i=1; i<=${#@}; i++)) {
 if [[ ${#paths[@]} -eq 0 ]]; then
     paths+=(".")
 fi
+which pv &>/dev/null && PVBIN=$( which pv )
 set -e
 echo "Updating: $list_name"
 test -f "$list_name" || touch "$list_name"
@@ -45,10 +46,17 @@ _update() {
     fi
     if test -f "$1"; then
         if awk '{ print substr($0,35) }' "$list_name" | grep -qFx "$1"; then
-            echo "$1: exist"
+            echo "Exists: $1"
         else
-            echo "$1: new"
-            md5sum "$1" >> "$list_name"
+            echo "New:    $1"
+            size=$( stat -c %s "$1" )
+            if [[ $size -gt 100000000 ]] && [[ -n "$PVBIN" ]]; then
+                # Use pv is size > 100MB
+                sum=$( $PVBIN "$1" | md5sum | awk '{ print $1 }' )
+                printf "%s  %s\n" "$sum" "$1" >> "$list_name"
+            else
+                md5sum "$1" >> "$list_name"
+            fi
             updates_done=1
         fi
     fi