hash for buffer contents

hash for buffer contents

[Pablo Rodriguez via ntg-context]

Dear list,

I have the following sample:

  \ctxlua{require("util-sha")}

  \starttext

  \startbuffer[abc]
  samples
  \stopbuffer

  \cldcontext{utilities.sha2.hash512("buffer-name")}
  \stoptext

Is there any way to get "utilities.sha2.hash512" with the contents of
the "abc" buffer?

Many thanks for your help,

Pablo
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Re: hash for buffer contents

[Max Chernoff via ntg-context]

Hi Pablo,

> Is there any way to get "utilities.sha2.hash512" with the contents of
> the "abc" buffer?

You can use "buffers.getcontent" or "buffers.raw":

   \startbuffer[test]
       One
       Two
       Three
   \stopbuffer[test]
   
   \starttext
   \startluacode
       require("util-sha")
   
       local content = buffers.getcontent("test")
       -- local content = buffers.raw("test") -- same result
       local sha512 = utilities.sha2.hash512(content)
       context(sha512)
   \stopluacode
   \stoptext

Depending on what you're trying to do, the "filter" module may be
helpful here.

-- Max
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Re: hash for buffer contents

[Pablo Rodriguez via ntg-context]

On 9/22/22 00:26, Max Chernoff via ntg-context wrote:
> Hi Pablo,
>
>> Is there any way to get "utilities.sha2.hash512" with the contents of
>> the "abc" buffer?
>
> You can use "buffers.getcontent" or "buffers.raw":

Many thanks for your reply, Max.

This is exactly what I needed.

>    \starttext
>    \startluacode
>        require("util-sha")
>
>        local content = buffers.getcontent("test")
>        -- local content = buffers.raw("test") -- same result
>        local sha512 = utilities.sha2.hash512(content)
>        context(sha512)
>    \stopluacode
>    \stoptext
>
> Depending on what you're trying to do, the "filter" module may be
> helpful here.

I think the following function is just fine for me:

  \startbuffer[test]
  just a test
  \stopbuffer

  \starttext
  \startluacode
    require("util-sha")

    function document.sha512buffer(buffer)
      return utilities.sha2.hash512(buffers.raw(buffer))
    end
  \stopluacode

  \def\shabuffer#1
    {\cldcontext{document.sha512buffer("#1")}}

  \shabuffer{test}

  \stoptext

Many thanks for your help again,

Pablo
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