cds.sh

#!/usr/bin/env bash

###
# Save this as ~/.cds/cds.sh
# chmod +x ~/.cds/cds.sh
# ~/.cds/cds.sh setup
##

fail() {
  echo "[$(date)] ERROR: $1"
}

info() {
  echo "[$(date)] INFO: $1"
}

CACHE_FOLDER="${HOME}/.cds"
CACHE_FILE="${CACHE_FOLDER}/cache.cds"

COMMAND="${1:---help}"
LINK="${2}"

__cds_print_usage()
{
    echo "Usage: cds COMMAND"
    echo ""
    echo "cds --help             - prints this dialog"
    echo "cds --setup            - creates cache directory"
    echo "cds --link LINK_NAME   - creates new link to current directory with name LINK_NAME"
    echo "cds --rm LINK_NAME     - removes given link"
    echo "cds --lookup LINK_NAME - prints details about given link"
    echo "cds --list             - prints all registered links"
    echo "cds LINK_NAME          - moves current context to directory at LINK_NAME"
}

__cds_setup()
{
    TARGET="${1:-$HOME/.bashrc}"

    mkdir -p "${CACHE_FOLDER}"
    rm -f "${CACHE_FILE}"
    touch "${CACHE_FILE}"

    if ! grep "alias cds='source ${CACHE_FOLDER}/cds.sh'" "${TARGET}" > /dev/null; then
        echo "

###
# cds.sh command line utility
###

alias cds='source $CACHE_FOLDER/cds.sh'" >> "${TARGET}"

        info 'cds set up successfully'
    fi
}

__cds_add_link()
{
    link_name="${1}"
    folder="${2:-$(pwd)}"

    if [[ -z "${link_name+empty}" ]]; then
        fail 'must supply link name'
    fi

    if [[ "${link_name}" == *'\|'*  ]]; then
        fail 'link name cannot contain special characters'
    fi

    if ! grep -e "${link_name}|" "${CACHE_FILE}" > /dev/null; then
        echo "${link_name}|${folder}" >> "${CACHE_FILE}"
        info "link created '$link_name' -> '$folder'!"
    else
        fail "'${link_name}' already exists"
    fi
}

__cds_lookup()
{
    link_name="${1}"

    result=`grep -e "^${link_name}|" "${CACHE_FILE}"`
    if [ $? -eq 0 ]; then
        info "found $(echo ${result} | awk -F'|' '{ print $2 }')"
    else
        fail "'${link_name}' doesn't exist"
    fi
}

__cds_rm_link()
{
    link_name="${1}"

    if [[ -z "${link_name+empty}" ]]; then
        fail 'must supply link name'
    fi

    result=`grep -e "^${link_name}|" "${CACHE_FILE}"`
    if [ $? -eq 0 ]; then
        sed -i.bak "/^${link_name}\|.*\$/d" "${CACHE_FILE}"
    else
        fail "'${link_name}' doesn't exist"
    fi
}

__cds_goto()
{
    link_name="${1}"

    result=`grep -e "^${link_name}|" "${CACHE_FILE}"`
    if [ $? -eq 0 ]; then
        warp=`echo ${result} | awk -F'|' '{ print $2 }'`
        cd "${warp}"
    else
        fail "'${link_name}' doesn't exist!"
    fi
}

__cds_list()
{
    echo -e "name | path\n----- | -----" | cat - "${CACHE_FILE}" | column -t -s'|'
}

if [[ -z "${COMMAND+empty}" ]] || [[ "$COMMAND" == "--help" ]]; then
    __cds_print_usage
elif [ "$COMMAND" = "--setup" ]; then
    __cds_setup $LINK
elif [ "$COMMAND" = "--link" ]; then
    __cds_add_link $LINK
elif [ "$COMMAND" = "--lookup" ]; then
    __cds_lookup $LINK
elif [ "$COMMAND" = "--rm" ]; then
    __cds_rm_link $LINK
elif [ "$COMMAND" = "--list" ]; then
    __cds_list
else
    __cds_goto $COMMAND
fi