/c \ \ <title>${title}

{{{ indent() { indent="$(printf "%${1}s")" sed "/^$/ !s/^/${indent}/; /
/!b; :pre; N; /<\/pre>/!b pre"
}

# }}}
# print comment block {{{
comment_block() {
  [ "$comment" = true ] || return 0
  <<-COMMENT cat
	
	  [Comment on this page]
	  
	  
	
	COMMENT
}

# }}}
# generate html by heredoc from .md file and templates {{{
html() {
  <<-END_OF_HTML sed '1d;$d'

	
	
	$(echo "$HEAD" | { [ -z "${title}" ] && cat || sed "/^ */c \ \ <title>${title}"; } )
	
	${HEADER}
	  


	  
	$(${MARKDOWN_BIN} | indent 4)
	  
	  $(comment_block | indent 2)
	  

	${FOOTER}
	
	

	END_OF_HTML
}

# }}}
# list of latest posts in markdown format {{{

latest_posts() {
  (IFS=$'\n'; echo "${index_list[*]}") | sort -r | head -20 | while read date path title; do
    echo "- $date [$title](/$path)"
  done
}

# }}}
# process frontmatter {{{

get_frontmatter() {
  sed -n '1 {//q; s/"//g; s/://p'
}

check_frontmatter() {
  unset title public index type date draft

  # define local variables for frontmatter
  while read key value; do
    export ${key,,}="$value"
  done <<<"$(get_frontmatter)"

  # don't process draft after function call
  test "$draft" != ""		&& return 1

  # skip making index in some cases
  test "$title"  = ""		&& return 0
  test "$public" = false	&& return 0
  test "$index"  = false	&& return 0
  test "$type"   = demo		&& return 0
  iso8601=$(date --iso --date "${date:-NULL}" 2>/dev/null)
  test "$iso8601"   = ""	&& return 0

  # put frontmatter info into variable "index" if title and date are valid
  index_list+=("$iso8601 $path $title")
}

# }}}
# remove SGML comments but keep the top one as frontmatter {{{

ignore_comment() {
  sed '1! { /^$/ d }'
}

# }}}
# RSS Feed {{{

get_channel_item() {
  path=${1#${OUTPUT_DIR}}
  <<-ITEM cat
	
	  $(grep -Po '.+' ${1} | head -1)
	  https://${HOST}${path}
	  $(md5sum ${1} | cut -d' ' -f1)
	  $(date --rfc-email -r ${1})
	
	ITEM
}

make_rss() {
  # Use modified time to get latest html files
  items="$(
    ls -1t $OUTPUT_DIR/**/**html \
    | head -10 \
    | while read html_file; do
      get_channel_item $html_file
    done \
    | indent 2 \
  )"

  <<-RSS cat
	
	
	  Dummy Website
	  https://${HOST}
	  
	  $global_description
	  zh-tw
	  $(date --rfc-email)
	  https://www.rssboard.org/rss-specification
	${items}
	
	
	RSS
}

# }}}

# }}}
# prepare directory for outputs {{{

mkdir -p $OUTPUT_DIR/
rm -rf $OUTPUT_DIR/**
ln -s $ASSET_DIR/* $OUTPUT_DIR/

# }}}
# content of templates {{{

declare -r HEAD="$(cat $TEMPLATE_DIR/head.html)"
declare -r HEADER="$(<$TEMPLATE_DIR/header.html indent 2)"
declare -r FOOTER="$(<$TEMPLATE_DIR/footer.html indent 2)"
declare -r INDEX_TEMPLATE="$(cat $TEMPLATE_DIR/index.md)"
index_list=()

# }}}
# for each markdown file {{{

files="$(find "$INPUT_DIR" -type f -name '*md')"
total=$(wc -l <<<"$files")
declare -i counter
for file in $files; do
  # set variables
  path=$(<<<"$file" sed "s#^${INPUT_DIR}/##; s/\.md$//").html; mkdir -p $(dirname $OUTPUT_DIR/$path)
  content="$(<${file} ignore_comment)"

  # use frontmatter to decide making html file or not
  <<<"$content" check_frontmatter || continue

  # log
  echo -e "\033[1K\r$((counter+=1))/$total \t\t processing $path"

  # add original content to $OUTPUT_DIR
  # and generate html file with 
  echo "$content" \
  | tee $OUTPUT_DIR/${file#${INPUT_DIR}/} \
  | { [ -n "$title" ] && echo "# $title"; cat; } \
  | html >$OUTPUT_DIR/$path

  # Set modified time for index/RSS
  mtime='@0'
  [ ! "$public" = false ] && [ -n "$iso8601" ] && mtime="$iso8601"
  touch -m -d "$mtime" $OUTPUT_DIR/$path

  unset h1 comment
done
echo

# }}}
# make index.html {{{

echo -en "Making\t\tindex.html"
export title=""
{
  echo "${INDEX_TEMPLATE}"
  echo -e '

\n\n'
  latest_posts
} \
| tee $OUTPUT_DIR/index.md \
| html >$OUTPUT_DIR/index.html

touch -m -d @0 $OUTPUT_DIR/index.html
echo -e "\tgenerated"

# }}}
# make RSS file {{{

echo -en "Making\t\tRSS"
make_rss >$OUTPUT_DIR/$RSSFILE
echo -e "\t\tgenerated"

# }}}

# vim: fdm=marker fdl=0