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#! /bin/bash
set -e
# Executable command for markdown
declare -r MARKDOWN_BIN="markdown -f fencedcode,autolink,alphalist,autolink,footnote,definitionlist"
# Directory for input/output
declare -r INPUT_DIR=${INPUT_DIR:?ENV \"INPUT_DIR\" is not set}
declare -r OUTPUT_DIR=${OUTPUT_DIR:?ENV \"OUTPUT_DIR\" is not set}
declare -r ASSET_DIR=${ASSET_DIR:-`pwd`/assets}
declare -r TEMPLATE_DIR=${TEMPLATE_DIR:-`pwd`/templates}
declare -r RSSFILE=feed.rss
declare -r HOST=${HOST:?}
# functions {{{
# add indent for each line except <pre> {{{
indent() {
indent="$(printf "%${1}s")"
sed "/^$/ !s/^/${indent}/; /<pre>/!b; :pre; N; /<\/pre>/!b pre"
}
# }}}
# print comment block {{{
comment_block() {
[ "$comment" = true ] || return 0
<<-COMMENT cat
<div style="border-radius: 6px; background: lightyellow">
<a style="display: inline-block; margin: 0.5em 0.5em 0 0; float: right" href="mailto:comment@topo.tw?subject=Comment on page: ${path}">[Comment on this page]</a>
<object type="text/html" data="/${path/%html/comment.html}" onload="observeResize(this)" style="width: 100%;"></object>
<script>
function observeResize(commentBlock) {
const doc = commentBlock.contentDocument.documentElement
new ResizeObserver(() => {
commentBlock.style.height = doc.clientHeight + 'px';
}).observe(doc);
}
</script>
</div>
COMMENT
}
# }}}
# generate html by heredoc from .md file and templates {{{
html() {
<<-END_OF_HTML sed '1d;$d'
<!DOCTYPE html>
<html lang="en">
$(echo "$HEAD" | { [ -z "${title}" ] && cat || sed "/^ *<title>/c \ \ <title>${title}</title>"; } )
<body>
${HEADER}
<hr><br>
<main>
$(${MARKDOWN_BIN} | indent 4)
</main>
$(comment_block | indent 2)
<br><hr>
${FOOTER}
</body>
</html>
END_OF_HTML
}
# }}}
# list of latest posts in markdown format {{{
latest_posts() {
(IFS=$'\n'; echo "${index_list[*]}") | sort -r | head -20 | while read date path title; do
echo "- <time title=\"$(date --rfc-email -d "$date")\" datetime=\"$date\">$date</time> [$title](/$path)"
done
}
# }}}
# process frontmatter {{{
get_frontmatter() {
sed -n '1 {/<!--/ !q; n}; /-->/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
<item>
$(grep -Po '<title>.+</title>' ${1} | head -1)
<link>https://${HOST}${path}</link>
<guid isPermaLink="false">$(md5sum ${1} | cut -d' ' -f1)</guid>
<pubDate>$(date --rfc-email -r ${1})</pubDate>
</item>
ITEM
}
make_rss() {
# Use modified time to get latest html files
items="$(
ls -1t $OUTPUT_DIR/**/**html \
| head -10 \
| while read html_file; do
get_channel_item $html_file
done \
| indent 2 \
)"
<<-RSS cat
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" >
<channel>
<title>Dummy Website</title>
<link>https://${HOST}</link>
<atom:link href="http://${HOST}/${RSSFILE}" rel="self" type="application/rss+xml" />
<description>$global_description</description>
<language>zh-tw</language>
<pubDate>$(date --rfc-email)</pubDate>
<docs>https://www.rssboard.org/rss-specification</docs>
${items}
</channel>
</rss>
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 "$INPUT_DIR" -type f,l -name '*md')"
total=$(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\tprocessing $path"
# add original content to $OUTPUT_DIR
# and generate html file with <h1>
echo "$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 '<br><br>\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
|
