a very simple script to build a static wiki out of a directory of markdown files

wiki.sh

#!/usr/bin/env bash

# requires pandoc
#          coreutils
#          uuidgen

set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
    set -o xtrace
fi

SITENAME="wiki"
SITEURL="https://rad.wiki.cool"
SITEDESCRIPTION="a little wiki"
LASTUPDATE=$(<updated)
TIMESTAMP=$(gdate +"%s")
RFC822=$(gdate -R)
RSSHEADER='<?xml version="1.0" encoding="UTF-8"?>
<rss
  xmlns:dc="http://purl.org/dc/elements/1.1/"
  xmlns:content="http://purl.org/rss/1.0/modules/content/"
  xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
  <channel>
    <title>
      <![CDATA[ '${SITENAME}']]>
    </title>
    <link>'${SITEURL}'</link>
    <atom:link href="'${SITEURL}'/feed.rss" rel="self" type="application/rss+xml"/>
    <description>
      <![CDATA[ '${SITEDESCRIPTION}' ]]>
    </description>
'
RSSEND='
  </channel>
</rss>'

build_logs() {
    # echo -e "# Changelog\n\n$(cat changelog.md)" > changelog.md # FIXME, this doesn't work because I'm not resetting the changelog every update
    pandoc changelog.md -o public/changelog.html
    cd content
    rm ../archive.md
    echo -e "# Archive\n" > ../archive.md
    for file in *;
    do
        archive_entry="- [${file%.*}](/${file%.*}.html)"
        echo -e "$archive_entry" >> ../archive.md
    done
    cd ..
    pandoc archive.md -o public/archive.html
}

build() {
    cd content
    i=0

    rm ../public/feed.xml
    touch ../public/feed.xml
    echo -e "${RSSHEADER}" > ../public/feed.xml

    for file in *; 
    do
        file_last_updated=$(stat -f %m "$file")
        if [ "$file_last_updated" -gt "$LASTUPDATE" ]; 
        then
            (( i++ ))
            updated_at="- [${file%.*}](/${file%.*}.html), ${RFC822}"
            echo -e "$updated_at\n$(cat ../changelog.md)" > ../changelog.md
            pandoc "${file}" -o ../public/"${file%.*}".html
            rss_entry='<item>
          <title>
            <![CDATA[ the page "'${file%.*}'" was updated! ]]>
          </title>
          <link>'${SITEURL}'/'${file%.*}.html'</link>
          <guid>'${SITEURL}/${file%.*}.html#$(uuidgen)'</guid>
          <pubDate>'${RFC822}'</pubDate>
          <description>
            <![CDATA[ 
    <p><a href="'${SITEURL}/${file%.*}.html'">'${file%.*}'</a> updated!</p>  ]]>
          </description>
        </item>'
            echo -e "$rss_entry" >> ../public/feed.xml
        fi
    done
    cd ..
    echo -e "$RSSEND" >> public/feed.xml
    if [ $i -gt 0 ];
    then
        build_logs "$@"
    fi
    echo "$TIMESTAMP" > updated
    echo "updated" $i "items."
}

help_text() {
    echo '
    Usage: ./wiki.sh
                     -b(uild)....to (re)build the site
                     -h(elp).....to display this message
'
}

if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
    help_text "$@"
    exit
elif [[ "${1-}" =~ ^-*b(uild)?$ ]]; then
    build "$@"
    exit
fi

cd "$(dirname "$0")"

main() {
    help_text "$@"
}

main "$@"