iOS: Add “Duplicate” post or "Copy post" functionality

[nozomimimi]

Expected behavior

Currently on the mobile app, "Duplicate post" functionality is not available. (It exists on Calypso, see the image below)
We should bring this functionality to the mobile app.

[cecilearkay]

Also asked by user on the French forums: link

[elibud]

+1 to adding this feature.

[designsimply]

I also would benefit a lot from this feature on mobile! I use it all the time to post calls for testing. 😊

[designsimply]

Found that we have designs for this already wordpress-mobile/WordPress-Android#7954 (comment), courtesy @osullivanchris. 👏

[mindgraffiti]

One thing to note.

• copy is a reserved keyword in iOS. I suggest using duplicate everywhere, including in the UI, because that's the term Calypso uses. @osullivanchris wdyt?

[mindgraffiti]

Implementation hints:

@Gio2018 and I explored some classes related to cloning or copying. There is no duplication helper PostCoordinator or PostService, but there is one in AbstractPost, - (AbstractPost *)cloneFrom:(AbstractPost *)source, so that may be of some use.

You might also check out the reblog feature, where a new draft post is created and then the fields were added one-by-one from the original post. This worked out because there were not very many fields and some of them required processing (like adding quotes or a caption). Check out ReaderReblogPresenter.swift for details.

[osullivanchris]

copy is a reserved keyword in iOS. I suggest using duplicate everywhere, including in the UI, because that's the term Calypso uses. @osullivanchris wdyt?

that's totally fine with me, @mindgraffiti ! Copy can mean a lot of things. Duplicate sounds more clear and specific.

I hadn't heard of reserved keywords before, that's interesting to know too.

[mindgraffiti]

@osullivanchris a reserved keyword is a word that the programming language already uses for OS-level work. Thankfully, it is rare to have a naming conflict like that. Most Swift keywords are not things you would normally use when naming your feature, such as: enum, for, if, else, subscript, var, const, struct. Think of it like naming your circles 'pixels' in a design, even though pixels are a measuring unit and not meant to describe a shape.

[wpericam]

3523700-zd