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_gitbcheckout() {
[ "$COMP_CWORD" -gt 1 ] && return # Complete only single branch
local cur prev words cword
_init_completion || return
local gdir branch
gdir="$(git rev-parse --git-common-dir 2>/dev/null)" || return
local branches=()
# TODO ignore current HEAD (merging HEAD to HEAD does not makes sense)
while read -r branch; do
branches+=("$branch")
done < <(find "$gdir/refs/heads" "$gdir/refs/remotes" -mindepth 1 -printf '%P\n')
COMPREPLY=($(compgen -W "${branches[*]}" -- ${cur}))
}
complete -F _gitbcheckout gitbcheckout
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