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#!/bin/bash

# This executable does nothing by itself. Setup links with:
# ln -s manyplayer next
# ln -s manyplayer same
# ln -s manyplayer guessfile

if [ "x${MANYPLAYER_DIR}" == "x" ] ; then
  MANYPLAYER_DIR=~/.manyplayer
fi

exe=$(basename $0)

function check {
  if [ ! -f ${MANYPLAYER_DIR}/cmd ] ; then
    echo "No command in manyplayer config (${MANYPLAYER_DIR}/cmd)."
    exit 1
  fi
  if [ ! -f ${MANYPLAYER_DIR}/last ] ; then
    echo "Position unspecified (${MANYPLAYER_DIR}/cmd)."
    exit 1
  fi
  if [ ! -f ${MANYPLAYER_DIR}/filename ] ; then
    echo "Filename template unspecified (${MANYPLAYER_DIR}/cmd)."
    exit 1
  fi
}

function play_last_file {
  local comm=$(<${MANYPLAYER_DIR}/cmd)
  local this=$(<${MANYPLAYER_DIR}/last)
  local filename=$(<${MANYPLAYER_DIR}/filename)
  exec $comm "${filename/!/$this}"
}

function play_next_file {
  local thelast=$(<${MANYPLAYER_DIR}/last)
  local thenext=$(printf %02d $(($thelast + 1)))
  echo -n $thenext > ${MANYPLAYER_DIR}/last
  play_last_file
}

function guess_filename {
  local guess=$(echo *$1*)
  local name=${guess/$1/!}
  echo -n $name > ${MANYPLAYER_DIR}/filename

  if [ "x$2" == "x" ] ; then
    echo -n 00 > ${MANYPLAYER_DIR}/last
  else
    echo -n $2 > ${MANYPLAYER_DIR}/last
  fi
}

if [ "x$exe" == "xnext" ] ; then
  check
  play_next_file
elif [ "x$exe" == "xsame" ] ; then
  check
  play_last_file
elif [ "x$exe" == "xguessfile" ] ; then
  if [ "x$1" == "x" ] ; then
    echo "Need a guess statement, try '01'."
    exit 1
  else
    guess_filename $1 $2
  fi
else
  echo "'$exe' doesn't look like a manyplayer command..."
  exit 1
fi