[NTG-context] Re: output filename with SHA256

[Bruce Horrocks <ntg@scorecrow.com>]

> On 23 Feb 2024, at 13:32, Pablo Rodriguez via ntg-context <ntg-context@ntg.nl> wrote:
> 
> Dear list,
> 
> I have the following sample file:
> 
> \starttext
> whatever
> 
> \startluacode
> luatex.wrapup(
>  function()
>    local t = {}
>    local pdf_file_name = tex.jobname..".pdf"
>    local sha_pdf = utilities.sha2.hash256(io.loaddata(pdf_file_name))
>    local c_r = environment.currentrun
>    t[c_r] =  sha_pdf
>    local exists_pdf = ("%s_%s-%s.pdf"):format(c_r-1, tex.jobname, t[c_r-1])
>    if io.exists(exists_pdf) then os.remove(exists_pdf) end
>    os.rename(pdf_file_name, ("%s_%s-%s.pdf"):format(c_r, tex.jobname,
> sha_pdf))
>  end
> )
> \stopluacode
> \stoptext
> 
> In short, it adds its SHA256 to the final filename.
> 
> Since renames the PDF document in each run, I would like to remove the
> output from the previous run.
> 
> The table seems not to store the value from a previous run.
> 
> I see now that I am creating it again with each run.
> 
> Is there any way to check if compilation needs any other run?
> 
> Many thanks for your help,

Rather than use the wrapup() hook can why not rename the file using a second job on the command line?

So your compile command might look like:

  $ context jobname.tex add_sha.tex

Jobname.tex is your main file and generates jobname.pdf as its output, while add_sha.tex contains the rename logic:

\starttext
\startluacode
   local pdf_file_name = "jobname.pdf"
   local sha_pdf = utilities.sha2.hash256(io.loaddata(pdf_file_name))
   os.rename(pdf_file_name, ("%s-%s.pdf"):format(pdf_file_name, sha_pdf))
\stopluacode
Done
\stoptext

—
Bruce Horrocks
Hampshire, UK

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