Fsnotes: Support parsing Textbundle packages containing text files with all extensions of text.* files

[magicnemo]

Describe the bug
Inside a text-bundle package, FSNotes only looks for a file named text.markdown (i.e. the extension to the text-file is "markdown).

Problem is, if using other apps (E.g. export from Ulysses using textbundle) or "markdown to textbundle conversion tools" (e.g. https://github.com/jsorge/textbundleify) they might product text.md files instead of text.markdown, the extension to the text file is not the same.

According to markdown spec any extension to "text.____" should be allowed. (http://textbundle.org/spec/)

Looking at Ulysses for instance, if you try to export from Ulysses using TextBundle and then try to read the text in FSNotes, its not possible, the text file looks empty in FSNotes UI. This due to Ulysses use .md extension instead of .markdown extension.

To Reproduce
Open a textbundle file that FSNotes created and inside it rename text.markdown to text.md and try read it in FSNotes afterwards.

Expected behavior
FSNotes can read and show .textbundle files, where at least also text.md files are parsed, not only text.markdown (and best would of course be text.* is supported with any extension)

Actual behavior
FSnotes shows an empty text file altough text exists.

Workaround
Manually rename text.md to text.markdown (for each .textbundle)

Supporting Files
Non needed.

Desktop (please complete the following information):

• OS: macOS
• OS version: 10.14.5
• FSNotes version: 4.0.3

Additional context
Otherwise thanks for a great app, and also supporting textbundle which i think is great way to handle images & other files! I'm using FSNotes together with "Folding Text" as external editor.

[voltaireodactyl]

It would be outstanding if the .highland format could also be supported -- my understanding is that the spec is the same as Textbundle, just purposed toward screenwriting: https://quoteunquoteapps.com/highland-2/highland-format.php

Thanks as always for all the hard work -- love the app so much.

[gingerbeardman]

@voltaireodactyl let's wait for them to release the highland spec (bottom section of the page you link says "coming soon")

[scaba]

The .highland file format has been used in their commercial product Highland (1 & 2) for seven years now and hasn't changed, so I'd suggesting any interested parties to implement the spec as written and update if needed. The .fountain spec is already pretty well documented

[gingerbeardman]

@scaba where is the highland spec? please add a link to it here.

We would also need to find external libraries to both parse and display these formats, similar to how we use one for markdown.

[glushchenko]

@magicnemo please test https://github.com/glushchenko/fsnotes/releases/tag/4.0.6

[magicnemo]

Working perfectly in 4.0.6, thanks!!! :)