my website
buildblog: introduce default.json
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buildblog.sh
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buildblog.sh
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#!/usr/bin/env sh
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index_template='template_index.html'
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page_template='template_page.html'
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defaults_file='default.json'
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template_start='<!--BEGIN TEMPLATE-->'
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template_end='<!--END TEMPLATE-->'
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[ -n "${1}" ] && cd "${1}"
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! [ -e "$index_template" ] && echo "${0}: error: ${1%/}/${index_template} does not exist" >&2 && exit 1
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! [ -e "$page_template" ] && echo "${0}: error: ${1%/}/${page_template} does not exist" >&2 && exit 1
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rel_root=''
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[ -n "${1:+x}" ] && cd "${1}" && rel_root="${1%/}/"
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! [ -e "$defaults_file" ] && echo "${0}: error: ${rel_root}${defaults_file} does not exist" && exit 1
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defaults="$(jq -c '.' "$defaults_file")"
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index_template="$(jq -r '.["$index-template"]' <<<"$defaults")"
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! [ -e "$index_template" ] && echo "${0}: error: ${rel_root}${index_template} does not exist" >&2 && exit 1
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# generate the code syntax highlighting css
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# unfortunately pandoc did not like --template=<(echo ...)
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# this... thing turns the template in the html into a json string with jq string interpolation, to be passed back into jq
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# thankfully this only has to be done once. cursedd
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template="$(sed "/\s*${template_start}/,/\s*${template_end}/!d;//d" "${index_template}" | \
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jq -Rs '"\"" + (gsub("(?<s>^|}})(?<p>.+?)(?<e>{{|$)"; "\(.s + (.p|@json|trimstr("\"")) + .e)"; "m") | rtrim | gsub("{{(?<p>.+?)}}"; "\\(\(.p))"; "m")) + "\""' -r)"
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jq -Rrs '"\"" + (gsub("(?<s>^|}})(?<p>.+?)(?<e>{{|$)"; "\(.s + (.p|@json|trimstr("\"")) + .e)"; "m") | rtrim | gsub("{{(?<p>.+?)}}"; "\\(\(.p))"; "m")) + "\""')"
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find . -name content.djot -print0 | sort -r -z | while read -r -d '' post; do
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find . -name meta.json -print0 | sort -r -z | while read -r -d '' post; do
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post="${post%/*}"
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echo -n "${post} "
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slashesinpath="${post//[^\/]}" # delete everything that isnt a slash
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slashesinpath="${#slashesinpath}" # count whats left (count slashes in $post)
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backtoblogroot="$(for ((i=0; i < slashesinpath; i++)); do echo -n '../'; done)"
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backtoblogroot="${backtoblogroot%/}"
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jq '.title' "${post}/meta.json"
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jq -r --arg path "${post}" "${template}" "${post}/meta.json" >> ./index.html
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pandoc -f djot -t html5 \
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--mathml \
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--template="${page_template}" \
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--variable="backtoblogroot=${backtoblogroot}" \
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# this thing is responsible for concatenating arrays together if for example both default and meta specify $pandoc-args
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# it also replaces every instance of {{root}} in $pandoc-args with backtoblogroot
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meta="$(jq -c '$meta[0] as $meta | . as $default | $meta | [paths(type == "array")] | reduce .[] as $p ($meta; setpath($p; ($default | getpath($p) // []) + getpath($p))) | $default * . | .["$pandoc-args"] = (.["$pandoc-args"] | map(gsub("{{root}}"; $root)))' \
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--slurpfile meta "${post}/meta.json" --arg root "$backtoblogroot" <<<"$defaults")"
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jq '.title' <<<"$meta"
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# with help from domi https://donotsta.re/objects/b84298d7-582f-4b42-9bbd-bc5636a2b9fb
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pandoc_args=()
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while read -r -d '' arg; do pandoc_args+=("$arg"); done < \
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<(jq --raw-output0 '.["$pandoc-args"][], .["$input"], "-o", .["$output"]' <<<"$meta")
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pushd "$post" >/dev/null
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pandoc_error=0
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pandoc \
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--variable="root=${backtoblogroot}" \
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--variable="path=${post#./}" \
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--metadata-file="${post}/meta.json" \
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"${post}/content.djot" -o "${post}/index.html"
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--metadata-file=<(printf %s "$meta") \
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"${pandoc_args[@]}" || pandoc_error=$?
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popd >/dev/null
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[ "$pandoc_error" != 0 ] && echo "warning: pandoc exited with code $pandoc_error, skipping" >&2 && continue
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jq -r --arg path "${post}" "${template}" <<<"$meta" >> ./index.html
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done
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sed -n "/${template_end}/,\$p" "${index_template}" >> ./index.html
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src/blog/2025-09-14-test/meta.json
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src/blog/2025-09-14-test/meta.json
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src/blog/2025-09-16-mastodon-stats/meta.json
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src/blog/2025-09-16-mastodon-stats/meta.json
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src/blog/default.json
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src/blog/default.json
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src/blog/template_index.html
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src/blog/template_index.html
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<ul>
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<!--BEGIN TEMPLATE-->
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<li><article>
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<a href="{{$path}}/">{{.title | @html}}</a>
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<a href="{{$path}}/{{if .["$output"] == "index.html" then "" else .["$output"] end}}">{{.title | @html}}</a>
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(<time datetime="{{.date}}">{{.date}}</time>)
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<span class="tags">{{.tags | map("<span class=\"tag\" data-tag=\"\(.)\">\(.)</span>") | join(" ")}}</span>
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</article></li>
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src/blog/template_page.html
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src/blog/template_page.html
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="pandoc and a shell script">
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<title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
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<link rel="stylesheet" href="$backtoblogroot$/../style.css">
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<link rel="stylesheet" href="$root$/../style.css">
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<style>
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#post-body {
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max-width: 50rem;
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}
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</style>
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$if(highlighting-css)$
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<link rel="stylesheet" href="$backtoblogroot$/highlighting.css">
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<link rel="stylesheet" href="$root$/highlighting.css">
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$endif$
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$for(author-meta)$
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<meta name="author" content="$author-meta$" />
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<meta name="author" content="$author-meta$">
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$endfor$
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$if(keywords)$
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<meta name="keywords" content="$for(keywords)$$keywords$$sep$, $endfor$" />
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<meta name="keywords" content="$for(keywords)$$keywords$$sep$, $endfor$">
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$endif$
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$if(description-meta)$
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<meta name="description" content="$description-meta$" />
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<meta name="description" content="$description-meta$">
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$endif$
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$for(css)$
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<link rel="stylesheet" href="$css$" />
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<link rel="stylesheet" href="$css$">
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$endfor$
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$for(header-includes)$
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$header-includes$
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</head>
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<body>
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<nav>
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<img src="$backtoblogroot$/../platinum_fop_45_o.svg" alt="" width="64" height="64" id="fops">
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<img src="$root$/../platinum_fop_45_o.svg" alt="" width="64" height="64" id="fops">
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<ul class="inline-list slashed">
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<li><a href="$backtoblogroot$/../">home</a></li>
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<li><a href="$backtoblogroot$/">blog</a></li>
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<li><a href="$root$/../">home</a></li>
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<li><a href="$root$/">blog</a></li>
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</ul>
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</nav>
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<main>