install

#!/bin/bash

install () {

    builder=$(dirname "$(realpath "$BASH_SOURCE")")
    target=$1
    if [[ "$1" == "remove" ]]; then 
        _remove=true
        shift 
        else 
        unset _remove 
    fi 
    [[ "$1" == "-d" ]] && dir="$2" && shift 2 
    target=${dir:-/usr/bin}/${1:-udib}
    cmd=$(basename $target)
    dir=$(dirname $target)

    if [[ $_remove ]]; then
    if [[ -f $target ]]; then
        echo link to builder found at "$target. Do you want to REMOVE IT? (y/n) "
        read -e ans
        [[ ! $ans == "y" ]] && return 1
        usesudo=""
        [[ $(stat -c "%U" $target) == "root" ]] && usesudo=sudo && echo owned by root, sudo required
        $usesudo /bin/rm $target 
        return 0
    else 
        echo link to builder not found at $target, nothing to remove 
    fi 
    return   
    fi

    # echo "$PATH --- $dir"
    declare -a a="(${PATH//:/ })"
    for i in ${a[*]}; do [[ "$i" == "$dir" ]] && found=true; done
    if [[ $found ]]; then 
        echo creating a link \'$cmd\' in \'$dir\' to \'$builder\' 
        if [[ -f $target ]]; then
            echo "$target already exists do you want to overwrite? (y/n) "
            read -e ans
            [[ ! $ans == "y" ]] && exit 1
        fi
        usesudo=""
        [[ $(stat -c "%U" $dir) == "root" ]] && usesudo=sudo && echo link target directory owned by root requires sudo
        if $usesudo ln -fns $builder/build $target; then
            if [[ ! $(command -v $cmd) ]]; then
            echo FATAL: link failed $cmd not found in path 
            else  
            echo install success: link $target created
            ls -ls $target
            echo now try running: \'$cmd -h\' now 
            fi
        else 
            echo Error creating link
            echo if \': Permission denied\' 'then' run \'sudo ./install\'
        fi


    else
        echo "Install failed: $dir not in current path"
        echo $PATH
        echo "link to script not created. your install options are:"
        echo "1. add $dir to your PATH" 
        echo "2. rerun this script using a directory in the system path (e.g ./install /usr/bin build)"
        echo "3. add the following export somewhere in your shell (e.g. ~/.bashrc)"
        echo "        export UDIB=$builder/build"
        echo '        and then use $UDIB to invoke the build script' 
        echo '        ( e.g  $UDBI -e mybuild.env myimagename)'
    fi

}

# if script was executed then call the function
(return 0 2>/dev/null) || install "$@"