setup

#!/usr/bin/env bash

usage() {
    cat <<EOF
Install/Uninstall dotfiles

SYNOPSIS:

    $PROGRAM [OPTION ...] PACKAGE ... PACKAGE

OPTIONS:

    -c           Use 'cp -nars' instead of GNU stow
    -d DIR       Install into DIR instead of $HOME
    -a           Install/uninstall all packages
    -u           Uninstall
EOF
}

install() {
    local package=$1
    if [ "$USECOPY" = true ]; then
        shopt -s dotglob nullglob
        cp -nars $(pwd)/$package/* $DESTDIR/
    else
        stow -t $DESTDIR $package
    fi
}

uninstall() {
    local package=$1
    if [ "$USECOPY" = true ]; then
        find $package -type f | while read f; do unlink $DESTDIR/$(expr $f : '[^/]*/\(.*\)') 2>/dev/null; done
        find $package -type l | while read f; do unlink $DESTDIR/$(expr $f : '[^/]*/\(.*\)') 2>/dev/null; done
        find $package -depth -prune -type d | while read d; do rmdir $DESTDIR/$(expr $d : '[^/]*/\(.*\)') 2>/dev/null; done
    else
        stow -t $DESTDIR -D $package
    fi
}

# Defaults
PROGRAM="${0##*/}"
DESTDIR=$HOME
USECOPY=false
cmd=install
all=false

# Show usage and exit if no options given
if [ $# == 0 ]; then
    usage
    exit 1;
fi

# Parse options
while getopts haucd: opt; do
    case $opt in
        u) cmd=uninstall;;
        a) all=true;;
        c) USECOPY=true;;
        d) DESTDIR="$OPTARG";;
        h | ?) usage; exit 2;;
    esac
done
shift $(($OPTIND-1))

# Create list of packages
declare -a pkgs
if [ "$all" = "true" ]; then
    for p in $(ls -d */); do pkg=${p%%/}; pkgs+=($pkg); done
else
    for pkg in $*; do pkgs+=($pkg); done
fi

# Perform actions
shift $((OPTIND-1))
for p in "${pkgs[@]}"; do
    if [ "$cmd" = "install" ]; then
        echo ${cmd}ing $p to $DESTDIR
    else
        echo ${cmd}ing $p from $DESTDIR
    fi
    $cmd $p
done