# Check to see if a command exists
function command_exists {
    command -v "$1" &> /dev/null
}

# OS detection
function is_deb {
    command_exists apt-get
}

function is_mac {
    [[ $(uname) == 'Darwin' ]]
}

function is_linux {
    [[ $(uname) == 'Linux' ]]
}

# Package management aliases
function pkg_install() {
    if is_mac; then
        brew install $1
    elif is_deb; then
        sudo apt-get -y install $1
    fi
}

function pkg_remove() {
    if is_mac; then
        brew remove $1
    elif is_deb; then
        sudo apt-get -y remove $1
    fi
}

function pkg_update() {
    if is_mac; then
        brew update && brew upgrade
    elif is_deb; then
        sudo apt-get update && sudo apt-get upgrade
    fi
}

# Ask for admin password up front and keep sudo alive until the end of the script
function keep_alive {
    sudo -v
    while true; do sudo -n true; sleep 60; kill -0 "$$" || exit; done 2>/dev/null &
}

# Extract a compressed file with the appropriate command
function unpack {
    if [ -f "$1" ]; then
        case $1 in
            *.tar.bz2)        tar xjf $1        ;;
            *.tar.gz)         tar xzf $1        ;;
            *.bz2)            bunzip2 $1        ;;
            *.rar)            unrar x $1        ;;
            *.gz)             gunzip $1         ;;
            *.tar)            tar xf $1         ;;
            *.tbz2)           tar xjf $1        ;;
            *.tgz)            tar xzf $1        ;;
            *.zip)            unzip $1          ;;
            *.Z)              uncompress $1     ;;
            *)                echo "'$1' cannot be extracted via extract()" ;;
        esac
    else
        echo "'$1' is not a valid file"
    fi
}

if is_mac; then

    # Change working directory to the top-most Finder window location
    function cdf() { # short for `cdfinder`
        cd "$(osascript -e 'tell app "Finder" to POSIX path of (insertion location as alias)')"
    }

    # Open a file in Mac OS's quick-look
    function quicklook {
        (( $# > 0 )) && qlmanage -p $* &>/dev/null &
    }

    # Check to see if the (mac) app exists
    function app_exists {
        [ -d /Applications/"$1" ] || [ -e /Applications/"$1".app ] || [ -e ~/Applications/"$1".app ]
    }

fi

# Output functions
function echo_g {
    echo -e "$green$1$NC"
}

function echo_r {
    echo -e "$red$1$NC"
}

# vim:set ft=zsh: