Does not survive session save and restore about vim-plugin-viewdoc HOT 4 OPEN

Well, I didn't know :help does survive session save/load. Not sure how I missed this, maybe it was implemented in vim after viewdoc release date (i.e. in last 9 years or so 😄). This is a cool feature and I'd like to have it in viewdoc. But, to be honest, unlikely I'll have enough spare time to implement it anytime soon. So, PR is welcome.

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@powerman Ok, same here, times are a bit busy to read through your code and send a PR in coming weeks. What about the minimal information that I ask? 1) full filename+path of current file, 2) way of knowing that current buffer is a vim-plugin-viewdoc's buffer? Don't you already have that information available at your disposal in the plugin somewhere?

If you could provide that, then at least I will be able to make it going in my vimrc. Then maybe at a later point a clean PR could be sent.

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In last years there was about 1 commit/year with minor updates, so I don't have viewdoc code base at the top of my head now.

AFAIR in most cases (doc sources) we don't have any source file, viewdoc run external tools and gather it output into vim buffer.

As for detecting viewdoc buffers - there was some way. One probably depends on concrete viewdoc plugin: usually they define a custom &ft value, like when you open documentation for Go you'll see ft=godoc, when you open documentation for shell script you'll see ft=man, etc. This was supposed to be used for doc-specific syntax highlight, but may be useful for you too. Or you may try to add some fixed marker into

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@powerman The way :help partially survives session save and restore is that it does not change the buffer's filename like vim-plugin-viewdoc does. If you try doing :echo expand('%:p') from a help buffer opened by :help, it will show the full path of file. While restoring the session, vim would open this file using usual :edit command, then a user can fully restore :help functionality in that buffer by processing it.

I see... if there is no source file, then it would be hard to save state and restore it. At least for the sources like vim help, man pages, etc that do have a file, a function that returns file name would be ideal.

A hacky way of checking if its a viewdoc buffer would be to look if a buffer local variable b: unique to viewdoc exists...

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