#!/bin/sh

# build_nvds
#
# David Adams
# October 2003
# For DIAL 0.60
#
# Builds an event merged dataset from a list of ID's.
# E.g.: build_nvds DSNAME
#
#  Input: $1 - dataset name DSNAME
#         idlists/DSNAME.ids - list of ID's
# Output: nvds_DSNAME.xml - merged dataset

if [ "$1" = "-h" -o -z "$1" ]; then
  echo "Usage: $0 DSNAME"
  exit 0
fi

DSNAME=$1
NVDS=nvds_$DSNAME.xml
IDDIR=idlists
IDLIST=$IDDIR/$DSNAME.ids

# Make sure input file exists
if [ ! -r $IDLIST ]; then
  echo Unable to read input file $IDLIST
  exit 1
fi

# No action if output file already exists.
if [ -r $NVDS ]; then
  echo Nonvirtual dataset already exists:
  echo "  $NVDS"
  echo "Please delete before recreating"
fi

# Count the lines in the file.
ALL=`cat $IDLIST`
FIRST=`echo $ALL | sed 's/ .*//'`
if [ -z "$FIRST" ]; then
  echo Inputfile is empty
  echo $IDLIST
  exit 2
fi

MANY=
if [ "$ALL" != $FIRST ]; then
  MANY=true
fi

# Merge datasets
if [ -n "$MANY" ]; then
  echo "Merging..."
  dataset_merge_events -u -f $NVDS -l $IDLIST
  STAT=$?
  if [ $STAT != 0 ]; then
    echo Error $STAT
    exit 3
  fi
# If there is only one sub-dataset, then just copy the file.
else
  echo "No merge; there is only one partition"
  cp $FIRST $NVDS
fi

echo Non-virtual dataset written to $NVDS