The tiddlywiki Node.js editon has a --render command which can render a tiddler with a template. And it is not difficult to export the markdown tiddlers in a format which is compatible with static site generators.
For example, this template can export tiddlers to nikola compatible format.
\rules except dash horizrule
---
title: {{!!title}}
date: {{{ [{!!modified}format:date[YYYY-0MM-0DD 0hh:0mm:0ssTZD]] }}}
tags: {{{ [enlist{!!tags}join[,]] }}}
---
`
`
<$view field="text" format="text" />
To export markdown tiddlers with the template, save the above template to $:/templates/nikola-markdown, and use this command to export all markdown tiddlers:
# The slugify operator is suggeseted to be used here
tiddlywiki mywiki --render "[type[text/markdown]] :or[type[text/x-markdown]]" "[slugify[]addprefix[nikola/]addsuffix[.md]]" "text/plain" "`$:/templates/nikola-markdown"
You can also add it to tiddlywiki.info, so that it can be run with the --build command:
"build": {
"nikola": [
"--render",
"[type[text/markdown]] :or[type[text/x-markdown]]",
"[slugify[]addprefix[nikola/]addsuffix[.md]]",
"text/plain",
"$:/templates/nikola-markdown"
]
}