config-screen/setup

#!/bin/bash

# relpath
script_dir="$( dirname "${BASH_SOURCE[0]}" )"
source ${script_dir}/../bash/functions 

link_path="$HOME/.screenrc"
target_name="screenrc"

target_path="$( relpath "${script_dir}/${target_name}" "$(dirname "${link_path}")" )"

# equals false for broken symlinks
if [ -e "${link_path}" ]; then
    # empty of link_path is not a link
    current_target="$(readlink "${link_path}")"
    if [ "$current_target" != "$target_path" ]; then
        mv --backup=numbered "$link_path" "${link_path}.old"
    fi
fi

if [ -e "${link_path}" ]; then
    echo "sym link to '$target_path' already installed at '$link_path'"
else
    # delete possibly existing broken symlink
    rm "$link_path" 2>/dev/null
    ln -s "$target_path" "$link_path"
    echo "installed sym link to '$target_path' at '$link_path'"
fi