#!/bin/bash

#      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2011
#
#  This file is part of webgen,
#  a small template engine for easy management of small websites.
#
#  This file is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 3
#  as published by the Free Software Foundation.
#
#  webgen is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this software; see the file COPYING.  If not, write to
#  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
#  Boston, MA 02110-1301, USA.

# Prefixes:
# - Include
# + Normal page
# ~ Dynamically generated page
# = Raw mode file.
# # Special/Config file

# Special files:
# -header             Is included before all [+~] pages
# -end                Is included after all [+~] pages
# -menu-mid           Is included after after menu file (if exists) on all [+~] pages.
# -faq_eoh            ???
# ?FAQ                Will be rendered as FAQ.
# ?NEWS               Will be rendered as NEWS.
# ?NO-TEMPLATES       Must not exist.

# CONFIG:

OUT=`pwd`
TPLS=tpl/

HEADER=header
END=end
PAGE_SUFFIX='.html'
TEMPLATES=''
DEFAULT_MENU='-menu-none'
PREPROCESSOR='none'

# CODE:

while [ ! -z "$1" ]
do
 case "$1" in
  '--preprocessor')
   PREPROCESSOR="$2"
   shift
  ;;
  '--'*)
   echo "Error: Unknown option: $1" >&2
   exit 1
  ;;
  *)
   TEMPLATES="$1"
  ;;
 esac
 shift
done

[ "$TEMPLATES" = '' ] && TEMPLATES="*"

if [ "$TEMPLATES" = '+' ]
then
 TEMPLATES_PAGE="*"
 TEMPLATES_DYN="NO-TEMPLATES"
 TEMPLATES_RAW="NO-TEMPLATES"
elif [ "$TEMPLATES" = '~' ]
then
 TEMPLATES_PAGE="NO-TEMPLATES"
 TEMPLATES_DYN="*"
 TEMPLATES_RAW="NO-TEMPLATES"
elif [ "$TEMPLATES" = '=' ]
then
 TEMPLATES_PAGE="NO-TEMPLATES"
 TEMPLATES_DYN="NO-TEMPLATES"
 TEMPLATES_RAW="*"
else
 TEMPLATES_PAGE="$TEMPLATES"
 TEMPLATES_DYN="$TEMPLATES"
 TEMPLATES_RAW="$TEMPLATES"
fi

cd $TPLS

cat_file() {
 _file="$1"
 case "$PREPROCESSOR" in
  none)
   cat -- "$_file"
  ;;
  cpp)
   cpp -P -o - -D__TEMPLATE__="\"$_tpl\"" -D__TEMPLATE_CLEAN__="\"$CLEANTPLNAME\"" -D __OUTPUT_FILE__="\"$OF\"" ./"$_file"
  ;;
  *)
   echo "Error: Unknown preprocessor: $PREPROCESSOR" >&2
  ;;
 esac
}

gen_news()
{
 if [ ! -d NEWS/ ]
 then
  return 1
 fi

 ls -1t NEWS/*.news | while read line
 do
  title=`echo "$line" | sed 's/.news$//; s#^NEWS/##;'`
  e=`echo "$title" | sed 's/[^a-zA-Z0-9]/_/g'`
  _t=`stat --format='%Z %U' "$line"`
  ctime=`echo "$_t" | cut -d' ' -f1`
  user=`echo "$_t" | cut -d' ' -f2`
  ctime_lr=`date --date "1970-01-01 00:00:00 UTC + ${ctime}sec"`
  echo "<h2><a name="\""news.gen.$e"\"">$title</a></h2>"
  echo "<p align=\"right\"><small>$ctime_lr by $user</small></p>"
  echo " <p>"
  sed 's#^$#</p><p>#' < "$line"
  echo " </p>"
 done
}

gen_faq()
{
 find FAQ/ -type d -not -wholename \*CVS\* | sed 's#^FAQ/##;'  | grep -v ^$   | sort > "$OF.FAQCATS"
 find FAQ/ -type f -not -wholename \*CVS\* -and -name \*.faq | sed 's#^FAQ/##; s#\.faq$##' | sort > "$OF.FAQINDEX"
 echo
 echo "<ul>"
 while read cat
 do
  echo " <li><b>$cat</b>"
  echo "  <ul>"
  grep "^$cat/" < "$OF.FAQINDEX" | \
  while IFS='/' read dummy q
  do
   e=`echo "$q" | sed 's/[^a-zA-Z0-9]/_/g'`
   echo "   <li><a href="\""#faq.gen.$e"\"">$q</a></li>"
  done
  echo "  </ul>"
  echo " </li>"
 done < "$OF.FAQCATS"
 echo "</ul>"

 [ -f ./-faq_eoh ] && cat_file "-faq_eoh"

 while read cat
 do
  echo " <h2>$cat</h2>"
  echo
  grep "^$cat/" < "$OF.FAQINDEX" | \
  while IFS='/' read dummy q
  do
   e=`echo "$q" | sed 's/[^a-zA-Z0-9]/_/g'`
   echo " <h3><a name="\""faq.gen.$e"\"">$q</a></h3>"
   echo " <p>"
   sed 's#^$#</p><p>#' < "FAQ/$cat/$q.faq"
   echo " </p>"
  done
 done < "$OF.FAQCATS"

 echo
}

proc_page() {
 _tpl="$1"
 CLEANTPLNAME=$(echo "$_tpl" | sed 's/^[\-\+\~]//')
 OF="$OUT"/"$CLEANTPLNAME""$PAGE_SUFFIX"
 echo "Compiling $CLEANTPLNAME -> $OF"
 SECTIONS=`for _sec in $(grep --no-filename -- "^$_tpl[^a-zA-Z0-9-]" '#section-index'* | sed 's/^[^ \t]*[ \t]*[ \t]//'); do O=''; for i in $(tr . ' ' <<<"$_sec"); do O="$O.$i"; echo $O; done; done`' .ALL'
# echo "Sections: $SECTIONS"
 SECTIONS_REGEX=$(for _sec in $SECTIONS; do echo "s/(section==$_sec:\([^)]*\):)/\1/g;"; done; echo "s/(section==.*:.*:)//g")
 MENU=$(grep --no-filename -- "^$_tpl[^a-zA-Z0-9-]" '#menu-index'* | sed 's/^[^ \t]*[ \t]*[ \t]//');
 [ "$MENU" = '' ] && MENU="$DEFAULT_MENU"
 {
  cat_file -$HEADER
  [ -n "$MENU"   ] && cat_file "$MENU"
  [ -e -menu-mid ] && cat_file -menu-mid
  cat_file  $_tpl
  [ "$CLEANTPLNAME" = 'FAQ' ] && gen_faq
  [ "$CLEANTPLNAME" = 'NEWS' ] && gen_news
  cat_file -$END
 } | \
   sed "$SECTIONS_REGEX" | \
   sed 's#href="[+~]\([^"\#]*\)\(\#*[^"]*\)"#href="\1'"$PAGE_SUFFIX"'\2"#g' > "$OF"
}

proc_raw() {
 _tpl="$1"
 CLEANTPLNAME=$(echo "$_tpl" | sed 's/^=//')
 OF="$OUT"/"$CLEANTPLNAME"
 echo "Compiling $CLEANTPLNAME -> $OF"
 cat_file  $_tpl > "$OF"
}

for i in +$TEMPLATES_PAGE \~$TEMPLATES_DYN
do
 [ -f "./$i" ] && proc_page "$i"
done

for i in =$TEMPLATES_RAW
do
 [ -f "./$i" ] && proc_raw "$i"
done

exit 0;

#ll