2

I would like a program that:

  1. If top layer of archive is just single item, then extract here
  2. If top layer of archive is several items, then extract to new folder

I see these:

but I would like an open source solution if possible.

-3

7-ZIP does this when using the Extract to.. menu option, is open source and supports a variety of archive formats.

I realize now that what you're actually asking is to ignore the intent of the root folder. An option like "Extract to this folder name" is predictable. There is a clear intent either to splurge the root into a folder vs always make sure there is a root folder. While "ignore root subfolder as long as its the only one" is not.

It is my opinion you will have a hard time finding an archiver that uses this logic.

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  • The name of the archive is used as the folder name. It shows up in the menu as Extract to and then the name of the archive. – jdwolf Oct 15 '17 at 6:33
  • Where to find it (your post misses a link)? And is it open source, as requested by OP? And does it really smartly decide by itself, as requested? According to the comment on this linked answer, it seems not. – Izzy Oct 15 '17 at 9:47
  • It behaves exactly as I described. The answer you linked is about "Extract here" which explicitly means extract INTO this folder NOT make a subfolder. Therefor the expectation there is just wrong. If you ask 7-zip to create a folder with "Extract to [archive name]" it will create a folder with that name and extract the contents into it UNLESS there archive contains a single root folder with the same name as the archive in which it will extract the contents of that inner folder. – jdwolf Oct 15 '17 at 10:07
  • If the archive contains a single FOLDER with the same NAME as the archive, then this solution works. but if it is a single FILE or single folder with a different NAME then his solutions fails – Steven Penny Oct 15 '17 at 14:09

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