feat: introduce FileSystem.unjarOnce
#1249
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`specs2-html` currently copies all of its html resources (41 files) for each specification (executed with html output), reading and traversing the `specs2-html.jar` four times in the process, overwriting its own previously copied files over and over. This is inefficient and causes unnecessary strain on the disk usage. The newly introduced `unjarOnce` method is used by `specs2-html` to only unjar its resources once for each target location and filter criteria.
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FileSystem.unjar once parameterFileSystem.unjarOnce
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specs2-htmlcurrently copies all of its html resources (41 files) for each specification (executed with html output), reading and traversing thespecs2-html.jarfour times in the process, overwriting its own previously copied files over and over. This is inefficient and causes unnecessary strain on the disk usage. The newly introducedunjarOncemethod is used byspecs2-htmlto only unjar its resources once for each target location and filter criteria.I went with a simple LRU cache as to not risk OOM, but I'm open to suggestions.
(I would also backport this to v4 if / once this is merged.)