Ghost: Set "title" attribute for images from markdown

[gotdibbs]

It'd be nice if we could set the title attribute for images as well as the alt attribute with the caption being entered in the markdown.

[JohnONolan]

I agree - this is a markdown extension, however, and as such extremely complicated to implement at present.

[ErisDS]

At the moment, we're using showdown for markdown to html conversion. Showdown uses regular expressions, which gets us into all kinds of knots. I had to take out title support in order to have better URL support. At the moment, it's a trade-off. In the future we'll use a proper parser, and be able to handle advanced features such as this.

[halfdan]

Regarding the title: I propose to use

<figure>
  <img src=".." alt=".." title="Optional title" />
  <figcaption>Optional title</figcaption>
</figure>

This would make it easy to add captions to images that are easy to style with CSS.

@JohnONolan This isn't a Markdown extension. It's part of the original Markdown: http://daringfireball.net/projects/markdown/syntax#img

---

I'd like to implement this if above format is accepted.

[Fasani]

@halfdan looks good...

Would this result in this for no title?

<figure>
    <img src=".." alt=".." title="Optional title" />
</figure>

or simple:

<img src=".." alt=".." />

[halfdan]

@Fasani: I guess to be consistent it should also result in <figure />, but I let @JohnONolan decide on that.

[JohnONolan]

Creating functionality like this is a lot less to do with what is and isn't a formal Markdown extension (you're right, it is) and a lot more to do with what is and isn't an extension of the Markdown-parsing-functionality which we have available to us (in which context, it absolutely is).

We plan to rip out the guts of our current Markdown parsing implementation (which is hack++) and write our own engine, as this is obviously a very integral/core part of Ghost.

Until then, as @ErisDS mentions, we heard you like REGEX so we put some REGEX in ur REGEX. ;) Which is not an ideal starting point for extending into more complex functionality.

Enhancements like this are absolutely welcome - we're just not quite ready for them yet.

[ErisDS]

Closing as wontfix against #1294 as it's pretty hard to get done before we rebuild the editor.