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# 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() {
# Check argument count
if [ "$#" -gt 1 ] ; then
printf >&2 'sd(): Too many arguments\n'
return 2
fi
# Read sole optional argument
case $1 in
# If blank, get a full list of directories at this level; include
# dotfiles, but not the . and .. entries, using glob tricks to avoid
# Bash ruining things with `dotglob`
'')
set -- ../[!.]*/
[ -e "$1" ] || shift
set -- ../.[!.]*/ "$@"
[ -e "$1" ] || shift
set -- ../..?*/ "$@"
[ -e "$1" ] || shift
;;
# If not, get that directory, and the current one; shift it off if it
# doesn't exist
*)
set -- ../"${1%/}"/ ../"${PWD##*/}"/
[ -e "$1" ] || shift
;;
esac
# We should now have two parameters: the current directory and the matched
# sibling
case $# in
2) ;;
0|1)
printf >&2 'sd(): No match\n'
return 1
;;
*)
printf >&2 'sd(): Multiple matches\n'
return 1
;;
esac
# Find which of these two is not the current directory and set that as our
# sole parameter
case $1 in
../"${PWD##*/}"/) set -- "$2" ;;
*) set -- "$1" ;;
esac
# Try and change into the first parameter
command cd -- "$1"
}
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