#!/bin/sh
# @(#$Id: rclsvg,v 1.3 2008-10-08 08:27:34 dockes Exp $  (C) 2004 J.F.Dockes
# Parts taken from Estraier:
#================================================================
# Estraier: a personal full-text search system
# Copyright (C) 2003-2004 Mikio Hirabayashi
#================================================================
#================================================================
# Extract text from a Scalable Vector Graphics file
#================================================================

# set variables
LANG=C ; export LANG
LC_ALL=C ; export LC_ALL
progname="rclsvg"
filetype=svg

#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 $cmd ; then return 0; else return 1; fi ;;
    *)
      oldifs=$IFS; IFS=":"; set -- $PATH; IFS=$oldifs
      for d in $*;do test -x $d/$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 iconv sed

encoding=`sed -ne '/<?xml/s/.*encoding="\([^"]*\).*/\1/p' < $infile`

if test X$encoding = X ; then encoding=UTF-8;fi

# We use several sed instances to make our life easier. Not good for
# performance, and a sed guru might be able to do better.
#
# The first sed makes sure each tag starts on a new line
# The second one selects the tags we're interested in.
# The last strips the tags, leaving only text.
#
# The whole thing wholly ignore issues like '<' inside quoted strings.
#
# We could/should add code to explicitely separate title and other
# metadata elements.

# Insert new line before each tag
sptagonline='s/</\
</g'

# Select tags
spselecttags='/<title/,/<\/title>/p
/<desc/,/<\/desc>/p
/<metadata/,/<\/metadata>/p
/<text/,/<\/text>/p'

# Strip tags
spstriptags='#n
/</{
    :c
     />/!{
	N
	b c
     }
     />/s/<.*>//g
}
/^[ 	]*$/!p'

content=`sed -e "$sptagonline" < $infile | sed -ne "$spselecttags" | \
    sed -ne "$spstriptags"`

(echo '<html><head>'
echo '<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">'
echo '</head><body><pre>'
echo "$content" 
echo '</pre></body></html>') \
| iconv -f $encoding -t UTF-8 -c -s 


# exit normally
exit 0
