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#!/bin/bash

#
# Copyright (c) 2015-2018 Samuel Thibault <samuel.thibault@ens-lyon.org>
#
# Licensed under Apache License v2.0.  See the file "LICENSE" for more
# information.
#

# Make sure we have enough options
if [ $# != 5 -a $# != 6 ]; then
  echo "ERROR: $0 jobid user name nb options [filename]" >&2
  exit 1
fi

NB=$4
OPTIONS=$5
FILE=$6

. /usr/share/cups/braille/cups-braille.sh

shopt -s extglob

# Construct list of pages from PAGERANGES

PAGES=" "   # Explicit list of pages
AFTER=      # All pages including and after this
BEFORE=     # All pages before and including this

[ -n "$PAGERANGES" ] || PAGERANGES="1-"

while [ -n "${PAGERANGES}" ]
do
  PAGERANGE=${PAGERANGES/,*}
  PAGERANGE=${PAGERANGE%%*( )}
  PAGERANGE=${PAGERANGE##*( )}
  if [ -n "${PAGERANGES/*,*}" ]
  then
    # last range
    PAGERANGES=""
  else
    # Remove leading range
    PAGERANGES="${PAGERANGES#*,}"
  fi

  if [ -n "${PAGERANGE/*-*}" ]
  then
    # single-page
    PAGES="$PAGES$PAGERANGE "

  elif [ -z "${PAGERANGE%%*-}" ]
  then
    # To the end
    FIRST=${PAGERANGE%%-*}
    if [ -z "$AFTER" ] || [ "$FIRST" -lt "$AFTER" ]
    then
      AFTER="$FIRST"
    fi

  elif [ -z "${PAGERANGE##-*}" ]
  then
    # From the beginning
    LAST=${PAGERANGE##*-}
    if [ -z "$BEFORE" ] || [ "$LAST" -gt "$BEFORE" ]
    then
      BEFORE="$LAST"
    fi

  else
    # page range
    FIRST=${PAGERANGE/-*}
    LAST=${PAGERANGE/*-}
    PAGES="$PAGES$(seq "$FIRST" "$LAST" | tr $'\012' ' ')"

  fi
done

# Determine whether to print this page
doprint() {
  PAGE="$1"
  if [ -n "$BEFORE" ] && [ "$PAGE" -le "$BEFORE" ]
  then
    echo 1
    return
  elif [ -n "$AFTER" ] && [ "$PAGE" -ge "$AFTER" ]
  then
    echo 1
    return
  fi
  case "$PAGES" in
    *\ $PAGE\ *)
      echo 1
      return
      ;;
  esac
  echo 0
}

if [ -z "$FILE" ]
then
  cat
else
  cat "$FILE"
fi | (
  P=1
  DOPRINT=$(doprint $P)
  IFS=$'\n' read -r LINE
  EOF=$?
  while [ "$EOF" = 0 -o -n "$LINE" ]
  do
    while [ -n "$LINE" -a -z "${LINE/*$'\014'*}" ]
    do
      # Possibly print before FF
      HEAD=${LINE%%$'\014'*}
      [ $DOPRINT == 0 ] || printf %s "$HEAD"$'\014'

      # Next page 
      P=$(($P + 1))
      DOPRINT=$(doprint $P)

      # Drop head of line
      LINE=${LINE#*$'\014'}
    done

    # Remainder of line
    if [ "$EOF" = 0 ]
    then
      NL="\n"
    else
      NL=""
    fi
    [ $DOPRINT == 0 ] || printf "%s$NL" "$LINE"

    IFS=$'\n' read -r LINE
    EOF=$?
  done
)

echo "INFO: Ready" >&2
exit 0

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