#!/bin/sh
# @(#$Id: rcltex,v 1.2 2007-11-09 15:56:14 dockes Exp $  (C) 2004 J.F.Dockes
#================================================================
# Translate TeX files for recoll. Uses either untex or detex to translate to html
#================================================================
# set variables
LANG=C ; export LANG
LC_ALL=C ; export LC_ALL
progname="rcltex"
filetype=TeX



#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

# Try to detect encoding
encoding=`egrep '\usepackage\[.*\]{inputenc}' "$infile" | \
                sed -e 's/.*\[//' -e 's/\].*//'`
if test "X$encoding" = Xutf8x ; then
    encoding=utf8
fi
# Found no usepackage directive to specify encoding. Have the system have a guess at it:
if test "X$encoding" = X ; then
    encoding=$(file -i "$infile" | awk -Fcharset= '{print $2}')
    if test "X$encoding" = "Xus-ascii" -o "X$encoding" = X; then
        # 'file' only reads the beginning of the text, which could still have some 8bit
        # chars later-on. utf-8 is self-identifying, so do a full test for it. This is
        # expensive, but important, and a common case these days. Finally, default to
        # extended latin1
        if iconv -s -f utf-8 -t utf-8 < "$infile" > /dev/null; then
            encoding=utf8
        else
            encoding=windows-1252
        fi
    fi
fi

if iscmd detex ; then
    checkcmds iconv
    CMD="detex -n -e ''"
else
    checkcmds untex iconv
    CMD="untex -giso -a"
fi

# output the result
cat <<EOF
<html><head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
</head><body><pre>
EOF

$CMD "$infile" | \
   iconv -c -f "$encoding" -t utf-8 | \
   sed -e 's/</&lt;/g' -e 's/&/&amp;/g' 

echo '</pre></body></html>'

exit 0
