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author | Tom Ryder <tom@sanctum.geek.nz> | 2016-08-20 12:08:31 +1200 |
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committer | Tom Ryder <tom@sanctum.geek.nz> | 2016-08-20 12:09:36 +1200 |
commit | 304f4afceef0d421f2bba1ab9acff98fc83b000d (patch) | |
tree | 129ecdcae789e82a609ab0c76667d4ced768b1fe /sh/shrc.d/bd.sh | |
parent | Remove OLDPWD hack (diff) | |
download | dotfiles-304f4afceef0d421f2bba1ab9acff98fc83b000d.tar.gz dotfiles-304f4afceef0d421f2bba1ab9acff98fc83b000d.zip |
Port bd() to POSIX sh
Diffstat (limited to 'sh/shrc.d/bd.sh')
-rw-r--r-- | sh/shrc.d/bd.sh | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sh/shrc.d/bd.sh b/sh/shrc.d/bd.sh new file mode 100644 index 00000000..0d1abbcf --- /dev/null +++ b/sh/shrc.d/bd.sh @@ -0,0 +1,67 @@ +# Move back up the directory tree to the first directory matching the name +bd() { + + # Set positional parameters to an option terminator and what will hopefully + # end up being a target directory + set -- -- "$( + + # If the first of the existing positional arguments is --, shift it + # off + [ "$1" = -- ] && shift + + # There's no more than one argument after that + [ "$#" -le 1 ] || exit 1 + + # The requested pattern is the first argument, defaulting to just the + # parent directory + req=${1:-..} + + # Strip trailing slashes if a trailing slash isn't the whole pattern + [ "$req" = / ] || req=${req%/} + + # What to do now depends on the request + case $req in + + # Just go straight to the root or dot directories if asked + /|.|..) + dirname=$req + ;; + + # Anything with a leading / needs to anchor to the start of the + # path. A strange request though. Why not just use cd? + /*) + dirname=$req + case $PWD in + "$dirname"/*) ;; + *) dirname='' ;; + esac + ;; + + # In all other cases, iterate through the PWD to find a match, or + # whittle the target down to an empty string trying + *) + dirname=$PWD + while [ -n "$dirname" ] ; do + dirname=${dirname%/*} + case $dirname in + */"$req") break ;; + esac + done + ;; + esac + + # Check we have a target after all that + if [ -z "$dirname" ] ; then + printf >&2 'bd(): Directory name not in path\n' + exit 1 + fi + + # Print the target + printf '%s\n' "$dirname" + + # If the subshell failed, return from the function with the same exit value + )" || return + + # Try to change into the determined directory + command cd "$@" +} |