#!/bin/bash

#
# Copyright (c) 2015-2018, 2021 Samuel Thibault <[email protected]>
# 
# 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

case $0 in
  *indexv3*) . /usr/share/cups/braille/indexv3.sh ;;
  *indexv4*) . /usr/share/cups/braille/indexv4.sh ;;
  *) echo "ERROR: $0 must be called as somethingindexv3 or somethingindexv4" >&2
     exit 1
     ;;
esac

printf "$INIT"

if [ $LIBLOUIS1 != None -o \
     $LIBLOUIS2 != None -o \
     $LIBLOUIS3 != None -o \
     $LIBLOUIS4 != None ]
then
  # software-translated, send to printer in transparent mode
  echo "INFO: Writing text to Index embosser in transparent mode" >&2
  if [ -z "$FILE" ]
  then
    cat
  else
    cat "$FILE"
  fi | (
    IFS=$'\n' read -r LINE
    EOF=$?
    while [ "$EOF" = 0 -o -n "$LINE" ]
    do
      # Strip CRs
      LINE=${LINE//$'\015'}
      # Ignore SUBs
      LINE=${LINE//$'\032'}
      # Turn non-breakable spaces into spaces
      LINE=${LINE//$'\302'$'\240'/ }
      LINE=${LINE//$'\240'/ }

      # Interpret FFs
      while [ -n "$LINE" -a -z "${LINE/#$'\014'*}" ]
      do
        printf "\\f"
	LINE=${LINE#$'\014'}
      done

      # Make sure there is nothing else we don't process
      if [ -n "$LINE" ]
      then
	if [ -z "${LINE/*[$'\000'$'\001'-$'\037'$'\177']*}" ]
	then
	  echo "ERROR: unsupported control character in BRF file" >&2
	fi
	if [ -z "${LINE/*[$'\200'-$'\377']*}" ]
	then
	  echo "ERROR: unsupported non-ASCII character in BRF file" >&2
	fi
      fi

      CHARS=$(printf %s "$LINE" | wc -c)
      if [ "$CHARS" -gt 127 ]
      then
        # Index printers have a bug with numbers between 128 and 255 in
        # transparent mode escape sequence. This is normally not a problem since
        # 128 chars is more than a line worth of text
	echo "ERROR: Line too long ($CHARS)" >&2
	exit 1
      fi
      if [ "$CHARS" -gt 0 ]
      then
	# Enter transparent mode for $CHARS characters
	printf "\\033\\\\\\x$(printf %02x $CHARS)\\x00"
	# Echo those $CHARS characters.
	# First normalize BRF characters (`a-z{|}~ are non-standard).
	# Drop unicode patterns with dots 7 or 8 in case the liblouis table happened to erroneously emit one
	# Drop remaining erroneous multibyte characters
	# Drop remaining erroneous 1-byte characters
	# Then turn it into Index 6dots sequences.
	printf %s "$LINE" | \
	  tr "\`a-z{|}~" "@A-Z\\[\\\\]_" | \
	  sed -e 's/[⡀⡁⡂⡃⡄⡅⡆⡇⡈⡉⡊⡋⡌⡍⡎⡏⡐⡑⡒⡓⡔⡕⡖⡗⡘⡙⡚⡛⡜⡝⡞⡟⡠⡡⡢⡣⡤⡥⡦⡧⡨⡩⡪⡫⡬⡭⡮⡯⡰⡱⡲⡳⡴⡵⡶⡷⡸⡹⡺⡻⡼⡽⡾⡿⢀⢁⢂⢃⢄⢅⢆⢇⢈⢉⢊⢋⢌⢍⢎⢏⢐⢑⢒⢓⢔⢕⢖⢗⢘⢙⢚⢛⢜⢝⢞⢟⢠⢡⢢⢣⢤⢥⢦⢧⢨⢩⢪⢫⢬⢭⢮⢯⢰⢱⢲⢳⢴⢵⢶⢷⢸⢹⢺⢻⢼⢽⢾⢿⣀⣁⣂⣃⣄⣅⣆⣇⣈⣉⣊⣋⣌⣍⣎⣏⣐⣑⣒⣓⣔⣕⣖⣗⣘⣙⣚⣛⣜⣝⣞⣟⣠⣡⣢⣣⣤⣥⣦⣧⣨⣩⣪⣫⣬⣭⣮⣯⣰⣱⣲⣳⣴⣵⣶⣷⣸⣹⣺⣻⣼⣽⣾⣿]/ /g' | \
	  sed -e "s/[^] \!\"#$%&'()*+,.\\/0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\\\\^_[-]/ /g" | \
	  tr "\000-\037\177\200-\377" " " | \
	  tr " \!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\\[\\\\\\]^_" "\\0V tSQW"$'\004'"gvAT@DP"$'\024'"d"$'\002\006'"\"bB&fF\$a\`Cw4q"$'\020\001\003\021'"1!"$'\023'"3#"$'\022'"2"$'\005\007\025'"5%"$'\027'"7'"$'\026'"6EGrUueRcs0p"
      fi
      if [ "$EOF" = 0 ]
      then
	printf "\\r\\n"
      fi
      IFS=$'\n' read -r LINE
      EOF=$?
    done
  )
  if [ $? != 0 ]
  then
    printf '\032'
    exit 1
  fi
else
  # not software-translated, send to printer as such
  echo "INFO: Writing text to Index embosser" >&2
  if [ -z "$FILE" ]
  then
    cat
  else
    cat "$FILE"
  fi
fi

printf '\032'

echo "INFO: Ready" >&2