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# Invoke tab-completion script to be sourced with Bash shell.
# Known to work on Bash 3.x, untested on 4.x.
_complete_{binary}() {{
local candidates
# COMP_WORDS contains the entire command string up til now (including
# program name).
# We hand it to Invoke so it can figure out the current context: spit back
# core options, task names, the current task's options, or some combo.
candidates=`{binary} --complete -- ${{COMP_WORDS[*]}}`
# `compgen -W` takes list of valid options & a partial word & spits back
# possible matches. Necessary for any partial word completions (vs
# completions performed when no partial words are present).
#
# $2 is the current word or token being tabbed on, either empty string or a
# partial word, and thus wants to be compgen'd to arrive at some subset of
# our candidate list which actually matches.
#
# COMPREPLY is the list of valid completions handed back to `complete`.
COMPREPLY=( $(compgen -W "${{candidates}}" -- $2) )
}}
# Tell shell builtin to use the above for completing our invocations.
# * -F: use given function name to generate completions.
# * -o default: when function generates no results, use filenames.
# * positional args: program names to complete for.
complete -F _complete_{binary} -o default {spaced_names}
# vim: set ft=sh :
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