#!/bin/sh
# @(#$Id: rcllyx,v 1.6 2007-06-08 13:51:09 dockes Exp $  (C) 2004 J.F.Dockes
# There may still be code from Estraier in here:
#================================================================
# Estraier: a personal full-text search system
# Copyright (C) 2003-2004 Mikio Hirabayashi
#================================================================
#================================================================
# Convert a lyx file to recoll HTML.
#
# We use lyx --export. It was suggested to use untex, but it doesn't give 
# good results on raw lyx (of course, this is not TeX), and exporting to
# LaTex then using untex doesn't look nice when we can use the native  lyx
# text export.
# The character encoding of the exported text is defined by the
# \inputencoding directive in the lyx file header and, in quite an obscure
# way, by the \language parameter. We use a heuristic to divine the output
# text encoding and it is guaranteed not to work in all cases. Trials using
# an intermediary dvi, pdf or ps file gave worse results. This needs
# improvement. It doesn't even take into account the fact that the language
# can change inside the doc (does this change the encoding or not ?). To be
# frank, this is not entirely my fault, the lyx format is a joke.
#
# As there is unfortunately no way to define the output file name, we have
# to use a temporary directory and link the input file in there.

# set variables
#LANG=C ; export LANG
#LC_ALL=C ; export LC_ALL
progname="rcllyx"
filetype=lyx





#RECFILTCOMMONCODE
##############################################################################
# !! Leave the previous line unmodified!! Code imported from the
# recfiltcommon file

# Utility code common to all shell filters. This could be sourced at run
# time, but it's slightly more efficient to include the code in the
# filters at build time (with a sed script).

# Describe error in a way that can be interpreted by our caller
senderror()
{
    echo RECFILTERROR $*
    # Also alert on stderr just in case
    echo ":2:$progname::: $*" 1>&2
    exit 1
}

iscmd()
{
    cmd=$1
    case $cmd in
    */*)
	if test -x $cmd -a ! -d $cmd ; then return 0; else return 1; fi ;;
    *)
      oldifs=$IFS; IFS=":"; set -- $PATH; IFS=$oldifs
      for d in $*;do test -x $d/$cmd -a ! -d $d/$cmd && return 0;done
      return 1 ;;
    esac
}

checkcmds()
{
    for cmd in $*;do
      if iscmd $cmd 
      then 
        a=1
      else 
        senderror HELPERNOTFOUND $cmd
      fi
    done
}

# show help message
if test $# -ne 1 -o "$1" = "--help" 
then
  echo "Convert a $filetype file to HTML text for Recoll indexing."
  echo "Usage: $progname [infile]"
  exit 1
fi

infile="$1"

# check the input file existence (may be '-' for stdin)
if test "X$infile" != X- -a ! -f "$infile"
then
  senderror INPUTNOSUCHFILE "$infile"
fi

# protect access to our temp files and directories
umask 77

##############################################################################
# !! Leave the following line unmodified !
#ENDRECFILTCOMMONCODE

checkcmds lyx iconv

# We need a temporary directory
if test z"$RECOLL_TMPDIR" != z; then
   ttdir=$RECOLL_TMPDIR
elif test z"$TMPDIR" != z ; then
   ttdir=$TMPDIR
else
   ttdir=/tmp
fi

tmpdir=$ttdir/rcllyx_tmp$$
mkdir $tmpdir || exit 1
mkdir $tmpdir/rcllyxtmp || exit 1

cleanup()
{
    # Note that we're using a constant part (rcllyxtmp), that hopefully
    # guarantees that we can't do big mistakes here.
    rm -rf $tmpdir/rcllyxtmp
    rmdir $tmpdir
}
    
trap cleanup EXIT HUP QUIT INT TERM

workdir=$tmpdir/rcllyxtmp
case "$infile" in
 */*) ;;
 *) infile=`pwd`/"$infile";;
esac

ln -s "$infile" "$workdir/input.lyx" || exit 1
lyxfile=$workdir/input.lyx
textfile=$workdir/input.txt

#echo lyxfile: $lyxfile ; ls -l $lyxfile; echo textfile: $textfile

# Run lyx --export
lyx --export text "$lyxfile" || senderror "lyx --export text "$lyxfile" failed"

# Need the lyx version. After some point -export prints utf-8,
# whatever the input version
LYXOUTPUTUTF=No
vline=`lyx --version 2>&1 | head -1 | tr '.' ' '`
set $vline
for i in $2 $3 $4;do
    expr "$i" ':' '[0-9][0-9]*' > /dev/null || \
        senderror "Bad lyx version string $vline"
done
maj=`expr $2 '*' 10000`
med=`expr $3 '*' 100` 
min=`expr $4 '*' 1` 
version=`expr $maj + $med + $min` || senderror "Bad lyx version string $vline"

if test $version -ge 10607 ; then
  LYXOUTPUTUTF=Yes
fi
if test X$LYXOUTPUTUTF = XNo ; then
echo "OLD VERSION"
  # Charset and language
  formatline=`egrep '^\\\lyxformat ' "$lyxfile"`
  if test -n "$formatline" ; then 
     set $formatline
     format=$2
  fi
  charsetline=`egrep '^\\\inputencoding ' "$lyxfile"`
  if test -n "$charsetline" ; then 
     set $charsetline
     charset=$2
  fi
  langline=`egrep '^\\\language ' "$lyxfile"`
  if test -n "$langline" ; then 
     set $langline
     lang=$2
  fi
  #echo format: [$format] charset: [$charset] lang [$lang]
  
  if test "$format" -ge 249 ; then
    charset=utf-8
  else
    # try to guess the charset from the language: this is in no way guaranteed
    # to work, the logic has built-in inconsistencies even beyond the numerous
    # external ones (what if the ukrainian writer prefers koi8-r ?). This is a
    # joke. 
  if test -z "$charset" -o "$charset" = default -o "$charset" = auto ; then
    case "$lang" in
      american|afrikaans|basque|catalan|danish|dutch|english|faeroese|finnish|french|galician|german|icelandic|irish|italian|norwegian|portuguese|spanish|swedish)
        charset=iso-8859-1;;
      czech|german|hungarian|polish|romanian|croatian|slovak|slovene)
        charset=iso-8859-2;;
      esperanto|galician|maltese|Turkish) 
        charset=iso-8859-3;;
      estonian|latvian|lithuanian) 
        charset=iso-8859-4;;
      bulgarian|byelorussian|macedonian|russian|serbian|ukrainian) 
        charset=iso-8859-5;;
      arabic) 
        charset=iso-8859-6;;
      greek) 
        charset=iso-8859-7;;
      hebrew) 
        charset=iso-8859-8;;
      #ISO-8859-9 - Latin 5 Same as 8859-1 except for Turkish instead of
      #Icelandic. ? What is one to do :)
      #ISO-8859-10 - Latin 6
      lappish|nordic|eskimo|inuit|sami)
        charset=iso-8859-10;;
    albanian|german|english|basque|breton|catalan|danish|spanish|estonian|esthonian|faeroese|faroese|finnish|french|frisian|friesian|scottish|goidelic|irish|gaelic|galician|welsh|greenlandic|inuit|icelandic|italian|latin|dutch|norvegian|portuguese|romansch|romansh|friulian|ladin|swedish)
        charset=iso-8859-15;;
      *)
        charset=iso-8859-1;;
      esac
    fi
  fi
# End Old lyx needing output tweaking
fi

if test -n "$charset" ; then
   inputcmd="iconv -f $charset -t UTF-8 -c -s"
else
   inputcmd=cat
fi
#echo inputcmd: [$inputcmd]

cat <<EOF
<html>
<head>
    <title>$title</title>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
</head>
<body>
<pre>
EOF

$inputcmd < "$textfile"

cat <<EOF
</pre>
</body>
</html>
EOF