cds - cd with aliases

.cdsmap.example

# This is a comment, only seperate-line comments are supported
mything   /long/path/to/my/thing
foo       /Users/myuser/bar
# When a path doesn't start with / it is mapped relative to $HOME:
myotherthing Downloads/foo/bar

cds.zsh

#### #### #### #### #### #### CDS - Quick cd  #### #### #### #### #### #### ####
#
# cd to shortcuts mapped in ~/.cdsmap
#
# The shortcuts are defined with an alias and a path:
#
#       # Comments on separate lines starting with # is allowed
#       mything /long/path/to/eventually/find/mything
#       down   Downloads
#
# If the path does not start with a /, it will be interpreted as $HOME/<path>
#
#
function cdsmap() {
    if [ -f $HOME/.cdsmap ]; then
        cat ~/.cdsmap | column -t
    fi
}
function cds() {
    if [ $# -eq 0 ]; then
        cdsmap
        return
    fi
    if [ "$1" = "" ]; then
        cdsmap
        return
    fi
    if [ -f ~/.cdsmap ]; then
        key=`echo $1 | cut -d '/' -f1`

        # remain is the part after the alias. So if my alias name is foo,
        # mapped to /Users/myuser/mydir, then foo/abc/somedir will map to 
        # /Users/myuser/mydir/abc/somedir
        remain=`echo $1 | sed "s@^$key@@g" | cut -d '/' -f 2-`

        # Read cdsmap, remove lines that start with # for comments, find the the key and output the value
        cdto=`cat ~/.cdsmap | sed -e '/^[ \t]*#/d' | grep "^$key"  | cut -d ' ' -f 2- | sed 's/^ *//g'`

        # If the value does not start with a /, assume that it is relative to the home directory
        # And prepend $HOME
        if [[ "$cdto" != \/*  ]]; then
            cdto="$HOME/$cdto"
        fi

        echo "Checking $cdto/$remain"

        # If the directory is empty, print error and dump the map
        if [ ! -d "$cdto" ]; then
            echo "Directory for $cdto not found"
            cdsmap
            return
        fi
        if [ "$cdto/$remain" = "/" ]; then
            echo "No such directory or cds alias: $1"
            cdsmap
            return
        else
            # Use builtin cd in order to allow cds to be used in a cd alias without looping
            # back on itself
            builtin cd $cdto/$remain
        fi
    fi
}

# 'cs' for short
alias cs=cds

# Complete based on the cdsmap file
_complete_cds(){
    if [ -f ~/.cdsmap ]; then
        reply=(`cat ~/.cdsmap | sed -e '/^[ \t]*#/d' | awk '{print $1}'`)
    else
        reply=""
    fi
}
compctl -x 'p[1]' -K _complete_cds -- cds
compctl -x 'p[1]' -K _complete_cds -- cs

# Remap regular cd to use cds if the directory does not exist
function cd() {
    if [ -d $@ ]; then
        builtin cd $@
    else
        cds $@
    fi
}