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# Move back up the directory tree to the first directory matching the name
bd() {
# 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[@]}]=$arg
;;
*)
break
;;
esac
done
# We should have zero or one arguments after all that, bail if there are
# more
if (($# > 1)) ; then
printf 'bash: %s: usage: %s [PATH]\n' \
"$FUNCNAME" "$FUNCNAME" >&2
return 2
fi
# The requested pattern is the first argument; strip trailing slashes if
# there are any
local req=$1
[[ $req != / ]] || req=${req%/}
# What to do now depends on the request
local dirname
case $req in
# If no argument at all, just go up one level
'')
dirname=..
;;
# Just go straight to the root or dot directories if asked
/|.|..)
dirname=$req
;;
# Anything else with a leading / needs to anchor to the start of the
# path
/*)
dirname=$req
if [[ $PWD != "$dirname"/* ]] ; then
printf 'bash: %s: Directory name not in path\n' \
"$FUNCNAME" >&2
return 1
fi
;;
# In all other cases, iterate through the directory tree to find a
# match, or whittle the dirname down to an empty string trying
*)
dirname=${PWD%/*}
while [[ -n $dirname && $dirname != */"$req" ]] ; do
dirname=${dirname%/*}
done
if [[ -z $dirname ]] ; then
printf 'bash: %s: Directory name not in path\n' \
"$FUNCNAME" >&2
return 1
fi
;;
esac
# Try to change into the determined directory
builtin cd "${opts[@]}" -- "$dirname"
}
# Completion setup for bd
_bd() {
# Only makes sense for the first argument
((COMP_CWORD == 1)) || return 1
# Build a list of dirnames in $PWD
local -a dirnames
IFS=/ read -d '' -a dirnames < <(printf '%s\0' "${PWD#/}")
# Remove the last element in the array (the current directory)
((${#dirnames[@]})) || return 1
dirnames=("${dirnames[@]:0:$((${#dirnames[@]}-1))}")
# Add the matching dirnames to the reply
local dirname
for dirname in "${dirnames[@]}" ; do
[[ $dirname == "${COMP_WORDS[COMP_CWORD]}"* ]] || continue
COMPREPLY=("${COMPREPLY[@]}" "$(printf %q "$dirname")")
done
}
complete -F _bd bd
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