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# Completion function for sd; any sibling directories, excluding the self
_sd() {
# Only makes sense for the first argument
((COMP_CWORD == 1)) || return 1
# Current directory can't be root directory
[[ $PWD != / ]] || return 1
# Build list of matching sibiling directories
local dirname
while IFS= read -rd '' dirname ; do
[[ -n $dirname ]] || continue
COMPREPLY[${#COMPREPLY[@]}]=$dirname
done < <(
# Set options to glob correctly
shopt -s dotglob nullglob
# Collect directory names, strip leading ../ and trailing /
local -a dirnames
dirnames=(../"${COMP_WORDS[COMP_CWORD]}"*/)
dirnames=("${dirnames[@]#../}")
dirnames=("${dirnames[@]%/}")
# Iterate again, but exclude the current directory this time
local -a sibs
local dirname
for dirname in "${dirnames[@]}" ; do
[[ $dirname != "${PWD##*/}" ]] || continue
sibs[${#sibs[@]}]=$dirname
done
# Print quoted sibs, null-delimited, if there was at least one;
# otherwise, just print a null character to stop this hanging in Bash
# 4.4
if ((${#sibs[@]})) ; then
printf '%q\0' "${sibs[@]}"
else
printf '\0'
fi
)
}
complete -F _sd sd
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