I think this is out of the scope of a general text editor. You could consider using a web-based pretty printer and pasting the result into Textastic.

Thank you for purchasing Textastic 6.

Files and settings of Textastic 5 and Textastic 6 are stored in a shared app group container. This is a special directory that can be accessed by several apps from the same developer. App group containers are only deleted once all apps that use it are deleted from device.

So, it is safe to delete the old version of Textastic. As long as Textastic 6 stays on the device, your files won't be deleted. You can ignore the warning.

Textastic 6 is a new universal app that works on both iPad and iPhone: https://geo.itunes.apple.com/us/app/id1049254261?ct=feedback&at=11lNQP&pt=15967&mt=8

Textastic 6 is now a universal app: https://geo.itunes.apple.com/us/app/id1049254261?ct=feedback&at=11lNQP&pt=15967&mt=8

Hello, Textastic supports TextExpander: https://smilesoftware.com/textexpander-ios

Maybe you can use that to define snippets? After you have defined snippets in the TextExpander app, you can use "Update Snippets" in Textastic's settings screen to fetch the snippets and use them in Textastic.

If Apple supported proper update pricing, I would have loved to use that.

You can download Textastic 5 from the Purchased tab on the App Store (or Updates -> Purchased on iPhone). See this article for details: https://support.apple.com/en-us/HT201272

This issue is probably related to a password lock bug I fixed. I'll look into it.