git.sesse.net Git - remoteglot-book/blob - find-pgn-split-point.sh

   1 #! /bin/sh
   2 FILE="$1"
   3 P=$2
   4 NUM=$3
   5
   6 split_point() {
   7         FILE="$1"
   8         P=$2
   9         NUM=$3
  10         SIZE=$( stat -c %s "$FILE" )
  11
  12         if [ "$P" -eq "0" ]; then
  13                 echo 0
  14         elif [ "$P" -eq "$NUM" ]; then
  15                 echo $SIZE
  16         else
  17                 TENTATIVE_SPLIT_POINT=$(( SIZE * P / NUM ))
  18                 OFFS=$( tail -c +${TENTATIVE_SPLIT_POINT} "$FILE" | grep -b '^\[Event ' | head -n 1 | cut -d: -f1 )
  19                 if [ -z "$OFFS" ]; then
  20                         echo $SIZE
  21                 else
  22                         echo $(( TENTATIVE_SPLIT_POINT + OFFS ))
  23                 fi
  24         fi
  25 }
  26
  27 split_point "$FILE" $P $NUM