#!/bin/bash
set -e

mkdir -p "${HOME}/public_gopher/blog" > /dev/null
mkdir -p "${HOME}/public_gemini/blog" > /dev/null
mkdir -p "${HOME}/public_html/blog" > /dev/null

srcDir=$HOME/blog
postDir=$srcDir/posts

htmlIndexTmpl=$srcDir/index.tmpl.html
htmlIndex=$HOME/public_html/blog/index.html

gopherPath=$HOME/public_gopher/blog
gopherIndex="${gopherPath}/gophermap"

geminiPath=$HOME/public_gemini/blog
geminiIndex="${geminiPath}/index.gmi"

rssIndexTmpl=$srcDir/feed.tmpl.xml
rssIndex=$HOME/public_html/blog/feed.xml

# attempt compilation
if [ ! -e "linkpost" ]
then
  go build -o linkpost main.go
fi

lp="$(pwd)/linkpost"

# backup HTML index
if [ -e "${htmlIndex}" ]
then
  cp $htmlIndex "${htmlIndex}.bak"
fi

# backup RSS feed
if [ -e "${rssIndex}" ]
then
  cp $rssIndex "${rssIndex}.bak"
fi

cp $htmlIndexTmpl $htmlIndex
cp $rssIndexTmpl $rssIndex

# Remove old gopher and gemini posts
rm -f ${gopherPath}/*
rm -f ${geminiPath}/*

# Initialize blog gophermap
echo "!the phlog of vilmibm as it were" > $gopherIndex
echo >> $gopherIndex

# Initialize blog index for gemini
echo "the gemblog of vilmibm as it were" > $geminiIndex
echo >> $geminiIndex

# Initialize rss
rfc822pubDate="$(date +'%a, %d %b %Y %H:%M:%S %Z')"
printf "    <pubDate>%s</pubDate>\n" "${rfc822pubDate}"             >> $rssIndex
printf "    <lastBuildDate>%s</lastBuildDate>\n" "${rfc822pubDate}" >> $rssIndex

cd $postDir > /dev/null

metadataKeys="pubdate:|title:|slug:|summary:"

for p in $(ls *.md | sort -r)
do
  pubdate=$(grep "pubdate:" $p | sed 's/pubdate: //')
  title=$(grep "title:" $p | sed 's/title: //')
  slug=$(grep "slug:" $p | sed 's/slug: //' | tr -d \[:blank:\])
  summary=$(grep "summary:" $p | sed 's/summary: //' | tr -d \[:blank:\])
  httpLink="https://tilde.town/~vilmibm/blog#${slug}"
  if [ -z "$pubdate" ] || [ -z "$title" ] || [ -z "$slug" ] || [ -z "$summary" ]
  then
    echo "warning: missing at least one of: pubdate, slug, title, summary in ${p}"
  else
    # HTML
    echo "<div class=\"title\">"                                               >> $htmlIndex
    echo "  <h2>${title}<a name=\"${slug}\"></a></h2>"                           >> $htmlIndex
    echo "  <a class=\"pubdate\" href=\"${httpLink}\">${pubdate}</a>"            >> $htmlIndex
    echo "</div>"                                                              >> $htmlIndex
    echo "<div class=\"post\">"                                                >> $htmlIndex
    grep -Ev "$metadataKeys" $p | $lp --mode "html" | pandoc -fmarkdown -thtml >> $htmlIndex
    echo "</div>"                                                              >> $htmlIndex


    # Gopher
    echo "0${title}	${slug}.txt" >> $gopherIndex
    gopherPostPath="${gopherPath}/${slug}.txt"
    echo "# ${title}"                                 > $gopherPostPath
    echo                                              >> $gopherPostPath
    echo "_published ${pubdate}_"                     >> $gopherPostPath
    grep -Ev "$metadataKeys" $p | $lp --mode "gopher" >> $gopherPostPath

    # Gemini
    echo "=> gemini://tilde.town/~vilmibm/blog/${slug}.gmi ${title}" >> $geminiIndex
    geminiPostPath="${geminiPath}/${slug}.gmi"
    echo "# ${title}"                                 > $geminiPostPath
    echo                                              >> $geminiPostPath
    echo "_published ${pubdate}_"                     >> $geminiPostPath
    grep -Ev "$metadataKeys" $p | $lp --mode "gemini" >> $geminiPostPath

    # RSS
    echo "    <item>"                                  >> $rssIndex
    echo "      <title>${title}</title>"               >> $rssIndex
    echo "      <link>${httpLink}</link>"              >> $rssIndex
    echo "      <guid>${httpLink}</guid>"              >> $rssIndex
    echo "      <pubDate>${rfc822pubDate}</pubDate>"   >> $rssIndex
    echo "      <description>${summary}</description>" >> $rssIndex
    echo "    </item>"                                 >> $rssIndex
  fi
done

# Finalize HTML
echo "</body></html>" >> $htmlIndex

# Finalize RSS
echo "  </channel>" >> $rssIndex
echo "</rss>" >> $rssIndex