iamcco/markdown-preview.nvim

dot edge is not rendered correctly

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#387 opened on Oct 29, 2021

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help wanted

Description

digraph {
  rankdir=LR;
  node [ shape=record ];

  struct1 [
      label = "a|b|<port1>c";
  ];
  
  struct2 [
      label = "a|{<port2>b1|b2}|c";
  ];
  
  struct1:port1 -> struct2:port2 [ label="xyz" ];
}

is rendered as following, the edge does not comes from "c" part, but from the middle of struct1

According to https://sketchviz.com/graphviz-examples, it should be rendered as this (the right part, ignore the line style)

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Familiarity with Graphviz DOT languageKnowledge of markdown preview.nvim plugin internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate how the markdown preview.nvim plugin renders Graphviz DOT diagrams. Look at the rendering pipeline, possibly in the markdown parser or the preview engine. Compare with the correct rendering from Sketchviz. The issue is that edges from record nodes point to the wrong port; likely a bug in mapping DOT port names to geometry.