Converting some Ruby (Digest) .. scant documentation

Help & Support
1

Preface by saying by no stretch do I pretend to be a programmer, just make short scripts and utils for personal use.

Only recently delved into Ruby and made a couple of maintenance scripts, but I can’t seem to wrap starkits like I can with Python or TCL, so was excited to find Crystal. I found one roadblock in a script I was converting; the script calls this block many times during its run:

def do_file_digest(file_in)
	return (Digest::SHA512.file file_in).to_s
end

There seems to be a file method in Crystal as far as I can tell, but I can’t seem to implement it correctly.

For what it’s worth, the other call to digest in my Ruby script hashes strings:

var = Digest::SHA512.hexdigest <string>

and it works fine in Crystal. Hopefully someone can point me in the right direction with regard to implementing .file, thanks.

2

You can use the block version of .hexdigest, then call the #file method. E.g.

def do_file_digest(file_path : String | Path) : String
  Digest::SHA512.hexdigest &.file file_path
end

It’s a bit not so clear, but the block version yields a Digest - Crystal 1.11.2 instance which implements it, but the yielding variant of the class method is defined in Digest::ClassMethods - Crystal 1.11.2 since it’s used in each digest type.

3

Did the trick, thanks much