dot_config/setup.sh

#!/bin/bash
# outcome: replace existing dot files with symlinks pointing to new version controlled files

#-------------------------------------------------------setup folder pointers and target files-------------------------------------------------------------

dir=~/dot_config
backup=~/dot_config_backup
files=".bashrc .vimrc .tmux.conf .psqlrc .gitconfig"

#-------------------------------------------------install debian tooling-----------------------------------------------------------------------------------

#----------curl-----------
if [ "$(dpkg-query -W -f='${Status}' "curl" 2>/dev/null | grep -c "ok installed")" == "1" ]
then
    echo "curl already installed"
else
    echo "installing curl"
    apt update -q4
    apt install curl -y
fi

#----------vim-----------
if [ "$(dpkg-query -W -f='${Status}' "curl" 2>/dev/null | grep -c "ok installed")" == "1" ]
then
    echo "vim already installed"
else
    echo "installing vim"
    apt update -q4
    apt install vim -y
fi

#----------tmux-----------
if [ "$(dpkg-query -W -f='${Status}' "tmux" 2>/dev/null | grep -c "ok installed")" == "1" ]
then
    echo "tmux already installed"
else
    echo "installing tmux"
    apt update -q4
    apt install tmux -y
fi

#------------------------------------------------ create the resore directory if it doesn't already exist--------------------------------------------------

if [ ! -d $backup ]
then
    mkdir $backup
fi

#-------------------------------------- loop through each target file, move it and create a symlink to the replacements------------------------------------

for file in $files 
do
    #if the file is not a symlink the just _move_ it, otherwise _copy_ the linked file
    if [ ! -L $file ];
    then
        mv ~/$file $backup
    else
        # if the target file is a symlink, copy the linked file
        cp $(readlink -f $file) $backup
        rm $file
    fi
    ln -s $dir/$file ~/$file
done

#----------------------------------------------------------install  go and go-powerline--------------------------------------------------------------------

# if $GOPATH is null the prompt for golang install
if [ -z "$GOPATH" ]
then
    while true; do
        read -p "do you want to install golang (needed for go-powerline)?" yn
        case $yn in
            [Yy]* ) 
                sudo apt-get install golang -y;
                break;;
            [Nn]* ) 
                break;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi

#----------------------------------------------------------install  go-powerline---------------------------------------------------------------------------

# see if this file exists, if not prompt for install
if [ ! -f ~/go/bin/powerline-go ]
then
    while true; do
        read -p "do you want to install go-powerline?" yn
        case $yn in
            [Yy]* ) 
                go get -u github.com/justjanne/powerline-go;
                break;;
            [Nn]* ) 
                break;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi

#----------------------------------------------------------install power line fonts------------------------------------------------------------------------

if [ ! -d ~/fonts ]
then
    while true; do
        read -p "do you want to install powerline fonts from 'https://github.com/powerline/fonts' ?" yn
        case $yn in
            [Yy]* ) 
                git clone https://github.com/powerline/fonts ~/fonts;
                cd fonts;
                ./install.sh;
                break;;
            [Nn]* ) 
                break;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi


#----------------------------------------------------------install tmux plugin manager and tmux resurrect--------------------------------------------------

if [ ! -d ~/.tmux/plugins/tpm ]
then
    while true; do
        read -p "do you want to install the tmux plugin manager from 'https://github.com/tmux-plugins/tpm' ?" yn
        case $yn in
            [Yy]* ) 
                git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm;
                break;;
            [Nn]* ) 
                break;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi


#----------------------------------------------------------see if Vundle has been cloned yet and do so-----------------------------------------------------

if [ ! -d ~/.vim/bundle ]
then
    while true; do
        read -p "do you want to install the Vundle plugin manager for vim from https://github.com/VundleVim/Vundle.vim.git?" yn
        case $yn in
            [Yy]* )
                git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim
                # ask to install plugins after vundle installed
                while true; do
                    read -p "Do you want to install the vim plugins now?" yn
                    case $yn in
                        [Yy]* ) vim +PluginInstall +qall; break;;
                        [Nn]* ) break;;
                        * ) echo "Please answer yes or no.";;
                    esac
                done
                break;;
            [Nn]* )
                break;;
            * ) echo "Please answer yes or no.";;
        esac
    done
fi