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# Bail if no make(1)
if ! hash make 2>/dev/null ; then
return
fi
# Completion setup for Make, completing targets
_make() {
local word=${COMP_WORDS[COMP_CWORD]}
# Quietly bail if no legible Makefile
if [[ ! -r Makefile ]] ; then
return 1
fi
# Build a list of targets by parsing the Makefile
local -a targets tokens
local target line
while read -r line ; do
if [[ $line == *:* ]] ; then
target=$line
target=${target%%:*}
target=${target% }
if [[ $target != *[^[:alnum:][:space:]_-]* ]] ; then
IFS=' ' read -a tokens \
< <(printf '%s\n' "$target")
targets=("${targets[@]}" "${tokens[@]}")
fi
fi
done < Makefile
# Complete with matching targets
COMPREPLY=( $(compgen -W "${targets[*]}" -- "$word") )
}
complete -F _make -o default make
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