From: "dave....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <dave.jarvis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Subject: GitHub now supports MermaidJS
Date: Thu, 13 Jan 2022 21:51:28 -0800 (PST) [thread overview]
Message-ID: <6a978c09-0b8d-4199-862a-0a0b78955a41n@googlegroups.com> (raw)
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Hi all,
Some food for thought on simple code block namespaces.
Re: https://github.com/github/markup/issues/533
I’m the main author of KeenWrite (see screenshots
<https://github.com/DaveJarvis/keenwrite/blob/master/docs/screenshots.md>),
a type of desktop Markdown editor that supports diagrams. It’s encouraging
to see that Mermaid diagrams are being supported in GitHub. There are a few
drawbacks on the syntax and implications of using MermaidJS.
First, only browser-based SVG renderers can correctly parse Mermaid
diagrams. I’ve tested Apache Batik, svgSalamander, resvg, rsvg-convert,
svglib, CairoSVG, ConTeXt, and QtSVG. See issue 2485
<https://github.com/mermaid-js/mermaid/issues/2485>. This implies that
typesetting Mermaid documents is not currently possible. In effect, by
including Mermaid diagrams, many documents will be restricted to web-based
output, excluding the possibility of producing PDF documents based on
GitHub markdown documents (for the foreseeable future).
Second, there are numerous text-to-diagram facilities available beyond
Mermaid. The server at https://kroki.io/ supports Mermaid, PlantUML,
Graphviz, byte fields, and many more. While including MermaidJS is a great
step forward, supporting Kroki diagrams would allow a much greater variety.
(Most diagrams produced in MermaidJS can also be crafted in Graphviz,
albeit with less terse syntax.)
Third, see the CommonMark discussion thread
<https://talk.commonmark.org/t/mermaid-generation-of-diagrams-and-flowcharts-from-text-in-a-similar-manner-as-markdown/1882>
referring to a syntax for diagrams. It’s unfortunate that a standard
“namespace” concept was not proposed.
Fourth, KeenWrite integrates Kroki. To do so, it uses a variation on the
syntax:
``` diagram-mermaid
```
``` diagram-graphviz
```
``` diagram-plantuml
```
The diagram- prefix tells KeenWrite that the content is a diagram. The
prefix is necessary to allow using *any* diagram supported by a Kroki
server without having to hard-code the supported diagram type within
KeenWrite. Otherwise, there is no simple way to allow a user to mark up a
code block with their own text style that may coincide with an existing
diagram type name.
Fifth, if ever someone wants to invent a programming language named Mermaid
(see MeLa
<https://pdfs.semanticscholar.org/7d75/49b737fd1d85bdaee016681e8915fea81ad9.pdf>),
then it precludes the possibility of using the following *de facto* syntax
highlighting:
``` mermaid
```
My feature request is to add support for Kroki and the diagram- prefix
syntax. That is:
``` diagram-mermaid
```
And deprecate the following syntax:
``` mermaid
```
And, later, introduce the language- prefix for defining code blocks that
highlight syntax. That is, further deprecate:
``` java
```
With the following:
``` language-java
```
That would provide a “namespace” of sorts to avoid naming conflicts in the
future.
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next reply other threads:[~2022-01-14 5:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-14 5:51 dave....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org [this message]
[not found] ` <6a978c09-0b8d-4199-862a-0a0b78955a41n-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
2022-01-14 15:33 ` Albert Krewinkel
[not found] ` <87tue6uxxy.fsf-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
2022-01-14 16:59 ` dave....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
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