remark-obsidian-callout

A remark plugin to parse Obsidian's callout syntax.

What is this

This is a remark plugin that parses Obsidian's callout syntax, and adds custom data attributes and classes to the HTML elements for further customizations.

How to use

Installation

First, install the plugin with your favorite package manager.

With npm:

npm install remark-obsidian-callout --save-dev

or with pnpm:

pnpm add -D remark-obsidian-callout

Then in your astro.config.mjs config file:

import remarkObsidianCallout from "remark-obsidian-callout";

export default defineConfig({
  // ...
  markdown: {
    // ...
    remarkPlugins: [
      // ...
      remarkObsidianCallout,
    ],
  },
  // ...
});

Now we can run the dev server with pnpm astro dev.

Say if we want to render an error callout with:

> [!error] This is an error callout
> This is the content inside callout

The callout would be rendered as something like this:

<blockquote
  class="callout-error"
  data-callout="error"
  data-expandable="false"
  data-expanded="false"
>
  <div class="callout-title">
    <div class="callout-title-icon">
      <!-- Predefined SVG here -->
    </div>
    <div class="callout-title-text">This is an error callout</div>
  </div>
  <div class="callout-content">This is the content inside callout</div>
</blockquote>

Now you can customize the callout with some CSS or JavaScript for example:

blockquote[data-callout] {
  padding: 1rem;
  border-radius: 1rem;
}

blockquote[data-callout="error"] {
  background-color: red;
}

[data-expanded="false"] .callout-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}

[data-expanded="true"] .callout-content {
  max-height: 100px; /* or whatever height needed */
}

[data-expandable="true"] .callout-title {
  cursor: pointer;
}

const callout = document.querySelector(".callout-error");

callout.addEventListener("click", () => {
  if (callout.getAttribute("data-expandable") === "true") {
    if (callout.getAttribute("data-expanded") === "false") {
      callout.setAttribute("data-expanded", "true");
    } else {
      callout.setAttribute("data-expanded", "false");
    }
  }
});

Configuration

To configure the plugin, simply add the following options to your astro.config.mjs file. For example:

import remarkObsidianCallout from "remark-obsidian-callout";

export default defineConfig({
  // ...
  markdown: {
    // ...
    remarkPlugins: [
      // ...
      [
        remarkObsidianCallout,
        {
          dataAttribute: "custom-callout",
          titleTextTagName: "span",
          iconTagName: "span",
          // ...
        },
      ],
    ],
  },
  // ...
});

Config Options:

export interface Config {
  // the data attribute name to be added to the blockquote
  dataAttribute: string;
  // the custom class name to be added to the blockquote, by default it's `${dataAttribute}-${calloutType}` if not specified
  blockquoteClass: string | undefined;
  // the custom class name to be added to the div, the parent element of icon & title text
  titleClass: string;
  // the tag name for the title text element, default to `div`
  titleTextTagName: string;
  // the custom class name to be added to the title text element
  titleTextClass: string;
  // a function to transform the title text, you can use it to append custom strings
  titleTextTransform: (title: string) => string;
  // the tag name for the title icon element, default to `div`
  iconTagName: string;
  // the custom class name to be added to the title icon element
  iconClass: string;
  // the custom class name to be added to the content element
  contentClass: string;
  // predefined callouts, an object with callout's name as key, its SVG icon as value
  // see https://help.obsidian.md/Editing+and+formatting/Callouts#Supported+types
  // you can customize it by overriding the same callout's icon or passing new callout with customized name and icon
  callouts: Record<string, string>;
}
// default configs
const defaultConfig: Config = {
  dataAttribute: "callout",
  blockquoteClass: undefined,
  titleClass: "callout-title",
  titleTextTagName: "div",
  titleTextClass: "callout-title-text",
  titleTextTransform: (title: string) => title.trim(),
  iconTagName: "div",
  iconClass: "callout-title-icon",
  contentClass: "callout-content",
  callouts: {
    note: pencilIcon,
    abstract: clipboardListIcon,
    summary: clipboardListIcon,
    tldr: clipboardListIcon,
    info: infoIcon,
    todo: checkCircleIcon,
    tip: flameIcon,
    hint: flameIcon,
    important: flameIcon,
    success: checkIcon,
    check: checkIcon,
    done: checkIcon,
    question: helpCircleIcon,
    help: helpCircleIcon,
    faq: helpCircleIcon,
    warning: alertTriangleIcon,
    attention: alertTriangleIcon,
    caution: alertTriangleIcon,
    failure: xIcon,
    missing: xIcon,
    fail: xIcon,
    danger: zapIcon,
    error: zapIcon,
    bug: bugIcon,
    example: listIcon,
    quote: quoteIcon,
    cite: quoteIcon,
  },
};

TODOs & Limitations

• Currently does not support nested callouts, as the usecase of this should be uncommon

Support

If you have any questions or suggestions, feel free to open an issue.

Credits

Thanks to remark-github-beta-blockquote-admonitions for guidance on how to set up testing.

License

The source code is licensed under the Apache 2.0 License, while the builtin icons from Lucide are licensed under the ISC License.