#!/usr/bin/env bash

# My (idempotent) dotfile deployment script.
#
# You pass the directories of "topics" to it to install them. It will:
# 1. symlink $topic/.* => ~/ and $topic/.(config|local)/* => ~/.\1/
# 2. run $topic/install the first time
# 3. run $topic/update on consecutive runs

set -e
source "$(cd $(dirname $0) && pwd -P)/shell/common.sh"
shopt -s nullglob

#
blue="\033[34m"
magenta="\033[35m"
green="\033[32m"
orange="\033[33m"
grey="\033[36m"
red="\033[31m"
nc="\033[0m"
#

_run() {
    local cmd="${@//$DOTFILES\//}"
    cmd="${cmd//$HOME/~}"
    local clr=""
    case $cmd in
        *~/.bin/) clr="${magenta}" ;;
        ln*)      clr=""  ;;
        mkdir*)   clr="${blue}"    ;;
        *)        clr="${orange}"
    esac
    echo -e "   $PREFIX$clr$cmd$nc"
    [[ $DRYRUN ]] || { $@ | sed 's/^/  => /'; }
}

_link() {
    if [[ -f "$2" || ( -d "$2" && -f "$2/${1##*/}" ) ]]; then
        if [[ $yes ]]; then
            [[ $yes = 1 ]] && choice=y || choice=n
        else
            read -n 1 -p "? ${1##*/} exists in $2 -- overwrite? [y/n] " choice
            echo
        fi
        case $choice in
            y|Y) _run rm -rf "$2"
                 PREFIX="${red}OVERWRITE:${nc} " _run ln -svf "$1" "$2"
                 ;;
            *)   PREFIX="${red}ABORTED:${nc} " DRYRUN=1 _run ln -svf "$1" "$2"
                 ;;
        esac
    else
        _run ln -svf "$1" "$2"
    fi
}


##
install=1
link=1
update=1
yes=0
while getopts iuldypLSUh opt; do
    case $opt in
        d) DRYRUN=1 ;;
        i) install= ;;
        l) link=    ;;
        p) yes=     ;;
        u) update=  ;;
        y) yes=1    ;;
        S) SERVER=1 ;;
        U) install=
           yes=0
           ;;
        L) update=
           install=
           yes=0
           ;;
        h) cat <<EOL
Usage: $0 [-iuldypLSU] [topic1] [topic2] [...]

    -i  Don't run install scripts
    -u  Don't run update scripts
    -l  Don't symlink dotfiles
    -d  Do a dry run (only output commands, no changes)
    -y  Overwrite conflicts (no prompts)
    -p  Prompt on file conflict (to overwrite)
    -L  Refresh links; the same as -ui
    -S  Server mode; only install the bare minimum
    -U  Update mode; run update scripts only
EOL
exit
            ;;
        *) >&2 echo "Aborted."
           exit 1   ;;
    esac
done
shift $((OPTIND-1))

#
CWD=$(cd $(dirname $0) && pwd -P)
ENABLED_DIR="$CWD/.enabled.d"
pushd $CWD >/dev/null
for topic in ${@:-$(ls -1 "$ENABLED_DIR" | sed 's%_%/%')}; do
    [[ -d $topic ]] || continue

    echo -e "${green}${topic}${nc}"

    tpath="$CWD/$topic"
    if [[ $link ]]; then
        # Symlink dotfiles from topics (2 levels deep) + parent (1 level deep)
        for file in "$tpath"{,../}/.[a-zA-Z]*; do
            if [[ -d "$file" && "${file##*/}" == .@(config|local) ]]; then
                for subfile in "$file"/*; do
                    base="$HOME/${file##*/}/"
                    [[ -d $base ]] || _run mkdir -p "$base"
                    _link "$subfile" "$base"
                done
            elif [[ -e $file ]]; then
                _link "$file" "$HOME/"
            fi
        done
    fi

    # Link topic to .enabled.d
    linkpath="${ENABLED_DIR}/${topic//\//_}"
    if [[ -h "$linkpath" ]]; then
        [[ "$update" && -x ${linkpath}/update ]] && _run "$tpath/update"
    else
        # Register topic as 'enabled'
        _run ln -svf "$tpath" "$linkpath"

        # Run install script
        [[ "$install" && -x ${linkpath}/install ]] && _run "$tpath/install"
    fi
done
popd >/dev/null

# vim:set ft=sh: