install

#!/bin/bash
set -e

cat <<"EOF"
      _       _    __ _ _           
     | |     | |  / _(_) |          
   __| | ___ | |_| |_ _| | ___  ___ 
  / _` |/ _ \| __|  _| | |/ _ \/ __|
 | (_| | (_) | |_| | | | |  __/\__ \
  \__,_|\___/ \__|_| |_|_|\___||___/
	    by @leonjza
	https://github.com/leonjza/dotfiles

EOF

declare -a REQUIRED=( "git" "stow" "curl" )
declare -a OPTIONAL=( "zsh" "nvim" )
declare -a STOWABLES=( "tmux" "zsh" "p10k" )

###
function green() { command echo -e "$(tput setaf 2; tput bold)$*$(tput sgr0)"; }
function red() { command echo -e "$(tput setaf 1)$*$(tput sgr0)"; }
function yellow() { command echo -e "$(tput setaf 3)$*$(tput sgr0)"; }
function fn_exists() { declare -F "$1" > /dev/null; }
OKAY=true
BACKUPDIR=$HOME/.config/dotfile-backups

echo "checking prerequisites..."
echo

# required tools
for c in "${REQUIRED[@]}"
do
	if ! command -v $c &> /dev/null
	then
		OKAY=false
		red "$c (required) could not be found"
	else
		green "$c (required) is available"
	fi
done

# optional tools
for c in "${OPTIONAL[@]}"
do
	if ! command -v $c &> /dev/null
	then
		yellow "$c (optional) could not be found"
	else
		green "$c (optional) is available"
	fi
done

if ! $OKAY
then
	red "install the required prerequisites first please"
	exit 1
fi

function f_usage() {
	echo
	echo "Usage: $0 <subcommand>"
	echo "Subcommands:"
    echo "  install     install software specific configuration"
    echo "  usage       echo this usage information"
    echo "  stow        stow configurations (aka, update symlinks)"
    echo "  unstow      remove symlinks (removing configs)"
}

function f_backup() {
    target=$1

    mkdir -p $BACKUPDIR

    if [[ -f $c ]] # exists
    then
        if [[ ! -L $c ]] # and is not a symlink
        then
            yellow "backing up $c to $BACKUPDIR"
            mv $c $BACKUPDIR/$(basename $c)
        fi
    fi
}

# funcs
function f_install() {

	echo
	read -r -p "happy to continue setup for the installed tools? [y/N] " -n 1
	echo
	if [[ ! "$REPLY" =~ ^[Yy]$ ]]; then
		yellow "doing nothing"
		exit 1
	fi

	# zsh
    if command -v zsh &> /dev/null
    then
        green "installing oh-my-zsh and plugins"
        f_backup "$HOME/.zshrc"

    	# base oh-my-zsh
        local temp="$(mktemp)"
        curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh -o $temp
        RUNZSH='no' sh $temp    # https://github.com/robbyrussell/oh-my-zsh/blob/master/tools/install.sh#L24
        rm -f $temp

        # install zsh-syntax-highlighting
        git clone https://github.com/zsh-users/zsh-syntax-highlighting.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-syntax-highlighting
        # install zsh-autosuggestions
        git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions
        # install powerlevel10k
        git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
    else
        yellow "skipping oh-my-zsh"
    fi

    # neovim
    if command -v nvim &> /dev/null
    then
        green "installing neovim config, astrovim"
        git clone --depth 1 https://github.com/AstroNvim/AstroNvim ~/.config/nvim
        rm -rf ~/.config/nvim/.git
    else
        yellow "skipping neovim config"
    fi

    # other targets that dont have anything to download but need backups
    f_backup "$HOME/.tmux.conf"

    green "installation done. use the stow subcommand to link configurations."
}

function f_stow() {
    echo "stowing configurations"

    for s in "${STOWABLES[@]}"
    do
        stow -t $HOME/ --restow $s
    done
}

function f_unstow() {
    yellow "performing unstow"
    echo "your old configs should be at $BACKUPDIR" 

    for s in "${STOWABLES[@]}"
    do
        stow -t $HOME/ --delete $s
    done
}

# parse commandline arguments
subcommand=$1
case $subcommand in
    "" | "usage" | "-h" | "--help")
        f_usage
        ;;
    *)
        shift
        if ! fn_exists f_${subcommand}
        then
            echo "error: '$subcommand' is not a known command."
            echo "  see: $0 usage"
            exit 1
        fi
        f_${subcommand} $@
        ;;
esac