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#
# sd -- sibling/switch directory -- Shortcut to switch to another directory
# with the same parent, i.e. a sibling of the current directory.
#
# $ pwd
# /home/you
# $ sd friend
# $ pwd
# /home/friend
# $ sd you
# $ pwd
# /home/you
#
# If no arguments are given and there's only one other sibling, switch to that;
# nice way to quickly toggle between two siblings.
#
# $ cd -- "$(mktemp -d)"
# $ pwd
# /tmp/tmp.ZSunna5Eup
# $ mkdir a b
# $ ls
# a b
# $ cd a
# pwd
# /tmp/tmp.ZSunna5Eup/a
# $ sd
# $ pwd
# /tmp/tmp.ZSunna5Eup/b
# $ sd
# $ pwd
# /tmp/tmp.ZSunna5Eup/a
#
# Seems to work for symbolic links.
#
sd() {
# For completeness' sake, we'll pass any options to cd
local arg
local -a opts
for arg ; do
case $arg in
--)
shift
break
;;
-*)
shift
opts[${#opts[@]}]=$arg
;;
*)
break
;;
esac
done
# Set up local variable for the sibling to which we'll attempt to move,
# assuming we find one
local dirname
# If we have one argument, it's easy, we just try to move to that one
if (($# == 1)) ; then
dirname=$1
# If no argument, the user is lazy; if there's only one sibling, we'll do
# what they mean and switch to it
elif (($# == 0)) ; then
# This subshell switches on globbing functions to try to find all the
# current directory's siblings; it exits non-zero if it found anything
# other than one
if ! dirname=$(
shopt -s dotglob extglob nullglob
local -a siblings
# Generate relative paths of all siblings
siblings=(../!("${PWD##*/}")/)
# Strip the trailing slash
siblings=("${siblings[@]%/}")
# Strip everything up to the basename
siblings=("${siblings[@]##*/}")
# If some number of siblings besides one, exit non-zero
if ((${#siblings[@]} != 1)) ; then
exit 1
fi
# Otherwise, just print it
printf %s "${siblings[0]}"
# This block is run if the subshell fails due to there not being a
# single sibling
) ; then
printf 'bash: %s: No single sibling directory\n' \
"$FUNCNAME" >&2
return 1
fi
# Any other number of arguments is a usage error; say so
else
printf 'bash: %s: usage: %s [DIR]\n' \
"$FUNCNAME" "$FUNCNAME" >&2
return 2
fi
# Try to change into the determined directory
builtin cd "${opts[@]}" ../"$dirname"
}
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