eslint --report-unused-disable-directives does not work with this plugin

[ehmicky]

eslint --report-unused-disable-directives is not reported when a <-- eslint-disable --> is defined in Markdown but is unused (i.e. could be removed).

.eslintrc.yml:

plugins: [markdown]
rules:
  no-inline-comments: 2

README.md:

<!-- eslint-disable no-inline-comments -->

```js
var aa = true
```

index.js:

/* eslint-disable no-inline-comments */
var aa = true

package.json:

{
  "name": "eslint-comments-bug",
  "version": "1.0.0",
  "license": "ISC",
  "dependencies": {
    "eslint": "^5.16.0",
    "eslint-plugin-markdown": "^1.0.0"
  }
}

In the terminal:

$ eslint --report-unused-disable-directives README.md
$ eslint --report-unused-disable-directives index.js

/home/ehmicky/eslint-comments-bug/index.js
  1:1  error  Unused eslint-disable directive (no problems were reported from 'no-inline-comments')

✖ 1 problem (1 error, 0 warnings)

--report-unused-disable-directives works for the JavaScript file, but not for the Markdown (where nothing is reported).

[btmills]

I suspect the cause here is the same as in #75.

Before linting, the processor looks for HTML comments preceding a code block and inserts them as /* ... */ comments at the beginning of the code. When it gets back a report from ESLint, it tries to map error locations in the linted code back to locations in the Markdown code block. Since the leading HTML comments aren't in the code block, if ESLint reports any errors on them, the plugin ignores those messages.

A fix would replace the bail-out check for HTML comments and instead map error locations back to their original location above the code block. That would require tracking original location information for comments, which it doesn't do right now. A fix for either this or #75 should fix both. I'd welcome a contribution if you're interested in taking a stab at it, @ehmicky!

[ehmicky]

Thanks for your explanation!

I would gladly help but I am not familiar with writing ESLint plugins. It's on my to-do list but not yet unfortunately :(