How does this bash completion function work? (for cloudfoundry cli) -


i try understand bash completion function ? (for cloudfoundry cli)

i read https://debian-administration.org/article/317/an_introduction_to_bash_completion_part_2 , bash ref guide @ https://www.gnu.org/software/bash/manual/bash.html#programmable-completion can figure out how code in script cloudfoundry works: (copy /usr/local/etc/bash_completion.d/cf)

      _cf() {           # arguments except first 1           args=("${comp_words[@]:1:$comp_cword}")           # split on newlines           local ifs=$' '           # call completion (note first element of comp_words           # executable itself)           compreply=($(go_flags_completion=1 ${comp_words[0]} "${args[@]}"))           return 0       }       complete -f _cf cf

in have installed plugins cf , see them in completion. (e.g. github.com cf-targets-plugin)

any hints me ? how word list generated ? (i assume in comp_words[])

this different samples like

compreply=( $(compgen -w "$worldist -- "$cur_opt") )

this speculative, because have not installed software.

apparently program generate list of available completions when invoked environment variable go_flags_completion set 1. code sets variable , calls program current arguments, , expects receive list of completions back.

this elegant solution context-based completions -- program knows parameters can accept current arguments, , bash doesn't have duplicate information or parse same arguments.


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