[MacPorts] #70403: qpdf: add shell completion

[MacPorts]

#70403: qpdf: add shell completion
----------------------------+-------------------------
  Reporter:  contextnerror  |      Owner:  Schamschula
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  qpdf           |
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Comment (by Schamschula):

 See the qpdf(1) man page:

 {{{
 COMPLETION (shell completion)
        Shell completion is supported with bash and zsh. Use eval $(qpdf
 --completion-bash) or eval $(qpdf --completion-zsh) to enable. The
 QPDF_EXECUTABLE
        environment variable overrides the path to qpdf that these commands
 output.

        Related Options:

        --completion-bash -- enable bash completion
               Output a command that enables bash completion

        --completion-zsh -- enable zsh completion
               Output a command that enables zsh completion
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70403#comment:1>
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