#!/bin/sh

# check parameters
source="$1"
target="$2"
type="$3"
sheet="$4"
extraparams=$5

if [ -z "$sheet" ]
then
 #docbook.xsl or chunk.xsl
 #set default stylesheet
 sheet="docbook.xsl"
fi

if [ -z "$source" ]
then
 echo "Usage: $0 <filename.xml> [filename.html] [type] [stylesheet] [extra xsltproc parameters]"
 echo "Convert DocBook XML file to HTML (or other type) using xsltproc and installed $sheet stylesheet"
 echo "If second filename is not specified, it defaults to first filename with .xml extension changed to .html"
 echo "If type is not specified, defaults to xhtml"
 echo "If stylesheet is not specified, defaults to docbook.xsl"
 exit 1
fi

#default type
if [ -z "$type" ]
then
 type=xhtml
fi

# list of space separated paths where $sheet can possibly be
# wildcards (like *) are allowed
# Entries are tried from firt to last until $sheet is found
#FreeBSD
XSLPATHS="/usr/local/share/xsl/docbook/$type /usr/share/xsl/docbook/$type"
#Gentoo
XSLPATHS="$XSLPATHS /usr/share/sgml/docbook/xsl-stylesheets*/$type /usr/local/share/sgml/docbook/xsl-stylesheets*/$type"
#Debian, Ubuntu
XSLPATHS="$XSLPATHS /usr/share/xml/docbook/stylesheet/nwalsh/$type"
#Cygwin
XSLPATHS="$XSLPATHS /usr/share/docbook-xsl/$type"

# look for stylesheet
xslpath=""
for xsl in $XSLPATHS

do
 if [ -r $xsl/$sheet ]
 then
  xslpath="$xsl/$sheet"
  break
 fi
done

# check if any stylesheet is found
if [ -z "$xslpath" ]
then
  echo "XSL stylesheet not found - check if $sheet stylesheet is installed"
  echo "or modify XSLPATHS in $0 to point to directory where it is installed"
  echo "(if installed in non-standard directory)"
  echo "Looked for $sheet in:"
  echo $XSLPATHS
  exit 1
fi

# check if source fuile exists
if [ ! -r "$source" ]
then
 echo "File $source not found"
 exit 1
fi

echo "$source: using XSL stylesheet $xslpath"

#if target not specified, it is guessed from name of source file
if [ -z "$target" ]
then
 target=`echo $source | sed s/\.xml$/\.html/`
fi
#Check for xsltproc
xsltpr=`which xsltproc`
if [ -n "$xsltpr" ]
then
 #run xsltproc
 xsltproc $extraparams $xslpath $source >$target
 retx=$?
 # success?
 if [ $retx -eq 0 ]
 then
  exit 0
 fi
 #so failure - input file is invalid
 rm $target
 exit 2
fi
#xsltproc not found
echo xsltproc not found
exit 1