Add lsp-gunzip function to decompress gzipped files

[lukel97]

Also add the :decompress argument to lsp-download-install so that dependencies can decompress themselves.
My main use case is to be able to download binaries for lsp-haskell.el, which has the binaries compressed with gzip. This way we can use dependencies like:

(lsp-dependency
 'haskell-language-server-wrapper
 '(:system "haskell-language-server-wrapper")
 `(:download :url ,(concat lsp-haskell-language-server-github-releases-url
			  (format "haskell-language-server-wrapper-%s.gz"
				  (lsp-haskell--github-system-type-suffix)))
	     :store-path ,(f-join lsp-server-install-dir "haskell" "haskell-language-server-wrapper")
	     :decompress :gzip
	     :set-executable? t))

So far I haven't add a script for windows Powershell yet, as I don't have a windows machine to test this on.

[nbfalcon]

Otherwise, LGTM. Perhaps @yyoncho might have some more comments.

Thank you for contributing!

[yyoncho]

So far I haven't add a script for windows Powershell yet, as I don't have a windows machine to test this on.

@kiennq - can you help with this?

[yyoncho]

So far I haven't add a script for windows Powershell yet, as I don't have a windows machine to test this on.

@kiennq - can you help with this?

Actually, I just realized that PowerShell works on linux as well. I will come up with a proposal.

[nbfalcon]

There is Expand-Archive.

[nbfalcon]

Expand-Archive won't work because it only supports zip, not gzip.

[lukel97]

Maybe we can use https://github.com/emacs-mirror/emacs/blob/master/lisp/jka-compr.el

[yyoncho]

Code looks good to me. The only thing that is missing is the windows scripts. I found this - https://scatteredcode.net/download-and-extract-gzip-tar-with-powershell/ which has gzip script but it seems like it can be used only on windows since it depends on .net(might be wrong). I think that we can merge it as it is if we change the error message: (error "Unable to find gzip' on the path, please customize lsp-gunzip-script'") to something like:

Unable to ... , please either customize ... or unzip manually path-to-arch(to location ...).

This way the user can continue the installation manually.

[yyoncho]

leftover

[yyoncho]

Thank you!