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Subject: Re: compgen -F
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Xref: csiph.com gnu.bash.bug:15490

> What does `works' mean here,
It means to work like "compgen -c pin", or like

> _completion_loader ping; COMP_WORDS=(ping); COMP_CWORD=1; 
> _known_hosts; declare -p COMPREPLY
or somehow else get possible completion results.

> and what are you trying to do with this patch?
I am trying to provide "pcomp_line" buffer which 
"gen_compspec_completion" function expect to be. Normally when we just 
press <TAB> after "ping ", "pcomp_line" is provided by 
"programmable_completions" function (it assign the buffer pointer to 
line buffer). This function is called from "attempt_shell_completion" 
function according to special logic which it consists (it determines 
whether programmable completion is needed).

On the other hand, "compgen" realization function ("compgen_builtin") 
just set pcom_line buffer pointer to NULL. Consequently, no programmable 
completion is possible in this case, because "pcomp_line" buffer is 
necessary. The buffer is parsed in "gen_compspec_completions" in order 
to bind variables like "COMP_WORDS", which are used in programmable 
completions bash scripts in /usr/share/bash-completion/.

Hope I said clearly. It is second language for me.