nix-super/misc/bash/completion.sh

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function _complete_nix {
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local -a words
local cword cur
_get_comp_words_by_ref -n ':=&' words cword cur
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local have_type
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while IFS= read -r line; do
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if [[ -z $have_type ]]; then
have_type=1
if [[ $line = filenames ]]; then
compopt -o filenames
fi
else
COMPREPLY+=("$line")
fi
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done < <(NIX_GET_COMPLETIONS=$cword "${words[@]}")
__ltrim_colon_completions "$cur"
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}
complete -F _complete_nix nix