file previews (html/text/archives...)

[kosarko]

currently supported:

• [x] .txt
• [x] .zip

bugs:

• [ ] .html

no support yet:

• [ ] compressed archives (such as .tar.gz, .tar.xz etc)
• [ ] .tar

trunc:

• [ ] txt previews and archive previews should be truncated (there are archives with ~100K+ files)

doc:

• previews used to be bitstream metadata and these are migrated, if this is done differently (is it?) can we eventually get rid of the metadata?

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compressed files, e.g. .vert.xz, don't need previews

quick links to items: .zip (11234/1-3141) .tar.gz (11234/1-1581) .tar.xz (11234/1-3068) .tar (11234/1-1458)