Re: [vim/vim] runtime(zip)!: Customizable zip/unzip commands (PR #20832)

curbe454 left a comment (vim/vim#20832)

> ```batchfile
> @7z l -ba %* | awk.exe "{ gsub(/\\/, \""/\"", $6); print ($3 ~ /D[^[:space:]]{4}/ ? $6 \""/\"" : $6)}"
> ```
> 
> They are still not elegant. Maybe we should provide an API to let users to format the outputs of commands, which may solve special character problem.

I tested providng a new API on my device (which is not committed):
```vim
if !exists("g:zip_browse_format")
  let g:zip_browse_tailcmd= [""]
endif

" ...

  let gnu_cmd = 'keepj sil r! ' . join(g:zip_browse) . ' ' . s:Escape(a:zipfile, 1) . ' ' . join(g:zip_browse_tailcmd)
```

And the configuration becomes to(on Windows):

```vim
let g:zip_browse  = ["7z l -ba"]
let g:zip_browse_format  = ["|", "awk", "'" . '{ gsub(/\\/, \\\"/\\\", $6); print ($3 ~ /D[^[:space:]]{4}/ ? $6 \\\"/\\\" : $6) }' . "'"]
```

It's kind of painful to debug to right codes because of escape characters. Or provide a customizable function `g:zip_browse_format` to format outputs, but this means manipulting strings with vimscript; and cannot make use of stream mechanism of pipe, which is more efficient.

So do not provide this API is better. Users can do some hack on the new global variables (`g:zip_browse`,  ...). Examples see my comments above.

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