Re: Bug in verbatim wrapping examples on wiki

[Pablo Rodriguez via ntg-context <ntg-context@ntg.nl>]

On 2/5/23 13:13, Hans Hagen via ntg-context wrote:
> On 2/5/2023 12:32 PM, Pablo Rodriguez via ntg-context wrote:
>> [...]
>> Are we missing something or is this a bug?
> what do you expect as result? (maybe try \righthyphenmin=1)

Line breaks are removing characters.

In the sample below, output from

  \hsize\zeropoint
  \sha{a1b2c3d4}

reads:

  a
 _
 _
 _
 _
  3d4

I’m afraid \righthyphenmin=-1 prevents hyphenation (it seems to do it
everywhere).

Sorry, but I don’t get what is wrong here.

Many thanks for your help,

Pablo


  \startluacode
  function document.addfunnyhyphen(tfmdata)
      local underscore = utf.byte("_")
      local char       = tfmdata.characters[underscore]
      if not char then return end
      tfmdata.characters[0xFE000]   = {
          width    = 0,
          height   = 0,
          depth    = 0,
          commands = {
              { "right", -char.width },
              { "down", char.depth },
              { "slot", 1, underscore },
          }
      }
  end


  utilities.sequencers.appendaction("aftercopyingcharacters",
  "after","document.addfunnyhyphen")

  local shared = {
      start  = 1,
      length = 1,
      before = utf.char(0xFE000),
      after  = nil,
      left   = false,
      right  = false,
  }

  local all = table.setmetatableindex({ }, function(t,k)
      return shared
  end)

  languages.hyphenators.traditional.installmethod("sha",
      function(dictionary,word,n)
          return all
  end
  )
  \stopluacode

  \definehyphenationfeatures
   [sha]
   [characters=all,
    alternative=sha,
    righthyphenchar="FE000]

  \unexpanded\def\sha#1%
   {\begingroup\tt
    \righthyphenmin=-1
    \sethyphenationfeatures[sha]%
    \setuphyphenation[method=traditional]%
    #1%
    \endgroup}

  \starttext
  \startTEXpage[width=6em, offset=.25em]
  \hsize\zeropoint
  \sha{a1b2c3d4}

  extraordinary linguistics

  \righthyphenmin=-1
  extraordinary linguistics
  \stopTEXpage
  \stoptext

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