#!/bin/bash
################################################################################
## Home Config Backup Script
## 2012-05-12
################################################################################
## Note for Zsh: because of the KSH-style arrays (index starting at 0), the
## KSH_ARRAYS option must be used.

##==============================================================================
## Options
##==============================================================================

## Set Debug mode on
DEBUG=no
if [ "$DEBUG" = "yes" ]; then
	set -x
fi

## Variables
OLDPATH="$(pwd)" # Enclose into a sub or use $OLDPATH
cd "$HOME"
SCRIPTPATH="$(readlink -f $(dirname "$0"))"
COMPRESSION="gz"
ARCHIVENAME="$HOME/home-config-$(date "+%y-%m-%d-%H%M%S")"
ARCEXT="tar.gz"
ARCOPT="cvzf"

print_help()
{
    echo "Synopsis:"
    echo "  $1 [-o ARCHIVENAME] [-m COMPRESSION]"
    echo
    echo "Usage:"
    echo "  default: "
    echo "  -h:\t\tDisplay this help."
    echo "  -m: compression method among"
    echo "      * gz (default)"
    echo "      * xz"
    echo "  -o: output archive name (without extension)."
    echo ""
    echo "Note: xz is not available on older Unices."

}

while getopts ":hm:o:" opt; do
    case $opt in
        h)
            print_help "$0"
            exit 1
            ;;

        m)
            COMPRESSION="$OPTARG"
            ;;

        o)
	        ARCHIVENAME="$(pwd)/$OPTARG"
            ;;

        ?) 
            print_help "$0"
            exit 1
            ;;
        :)
            echo "Missing argument."
            echo "Use $0 -h for help."
            exit 1
            ;;
    esac
done

shift $(($OPTIND - 1))

case $COMPRESSION in
    "gz")
        ARCEXT="tar.gz"
        ARCOPT="cvzf"
        ;;

    "xz")
        ARCEXT="tar.xz"
        ARCOPT="cvJf"
        ;;

    *)
        ARCEXT="tar.gz"
        ARCOPT="cvzf"
        ;;
esac


if [ "${DEBUG}" = "yes" ]; then
    echo "COMPRESSION=[$COMPRESSION]"
    echo "ARCHIVENAME=[$ARCHIVENAME]"
    echo "ARCEXT=[$ARCEXT]"
    echo "ARCOPT=[$ARCOPT]"
fi

if [ -e "${ARCHIVENAME}.${ARCEXT}" ]; then
	echo "Error: ${ARCHIVENAME}.${ARCEXT} already exists!">&2
    exit 0
fi

##==============================================================================
## Arch Linux packages list
##==============================================================================

if [ -e "/usr/bin/pacman" ]; then
	ARCH_PKG_OFFICIAL="$HOME/.arch-pkg-official"
	ARCH_PKG_EXPLICIT="$HOME/.arch-pkg-explicit"
	ARCH_PKG_AUR="$HOME/.arch-pkg-aur"
	ARCH_MIRRORS="$HOME/.arch-mirrors"

	PKG_LOCAL='pacman -Qq | sort'
	PKG_FOREIGN='pacman -Qmq | sort'
	PKG_EXPLICIT='pacman -Qeq | sort'
	PKG_FILTER='grep \< | cut -f2 -d" "'

	diff <(eval "${PKG_LOCAL}") <(eval "${PKG_FOREIGN}") | eval "${PKG_FILTER}" >"${ARCH_PKG_OFFICIAL}-$(hostname)"

    eval "${PKG_EXPLICIT}" >"${ARCH_PKG_EXPLICIT}-$(hostname)"
    eval "${PKG_FOREIGN}" >"${ARCH_PKG_AUR}-$(hostname)"

	cat /etc/pacman.conf | grep "^\[">"${ARCH_MIRRORS}-$(hostname)"
fi

##==============================================================================
## Let's fill the file list:
##==============================================================================
FILELIST=()

# Arch Linux package list
if [ -e "/usr/bin/pacman" ]; then
    FILELIST[${#FILELIST[*]}]="$(find . -maxdepth 1 -name '.arch*'  -exec basename {} \;)"
fi

# Awesome
FILELIST[${#FILELIST[*]}]="$(find .config/awesome \( -name "*.lua" -o -name "*.sh" \) -type f)"

# cmus
FILELIST[${#FILELIST[*]}]="$(ls .cmus/{autosave,*.theme}) "

# Conky
FILELIST[${#FILELIST[*]}]=".conkyrc"

# Emacs
FILELIST[${#FILELIST[*]}]=".emacs"
FILELIST[${#FILELIST[*]}]=".emacs.d/plugins"
FILELIST[${#FILELIST[*]}]=".emacs.d/abbrev_defs"

# GTK
FILELIST[${#FILELIST[*]}]=".gtkrc-2.0"
FILELIST[${#FILELIST[*]}]=".config/gtk-3.0/settings.ini"

# Luakit
FILELIST[${#FILELIST[*]}]=".config/luakit/"

# LXTerminal
FILELIST[${#FILELIST[*]}]=".config/lxterminal/lxterminal.conf"

# MPlayer
FILELIST[${#FILELIST[*]}]=".mplayer"

# Mutt
# FILELIST[${#FILELIST[*]}]=".muttrc"

# Nano
FILELIST[${#FILELIST[*]}]=".nanorc"

# Netinit
FILELIST[${#FILELIST[*]}]=".netinit"

# Ranger
FILELIST[${#FILELIST[*]}]="$(ls -d --indicator-style=none .config/ranger/*|grep -vi 'pycache\|bookmarks\|history\|tagged')"

# rtorrent
FILELIST[${#FILELIST[*]}]=".rtorrent.rc"

# Shells
FILELIST[${#FILELIST[*]}]=".bashrc"
FILELIST[${#FILELIST[*]}]=".zshrc"
FILELIST[${#FILELIST[*]}]="$(ls .shell.d/*|grep -vi 'bhistory')"

# Taskwarrior
FILELIST[${#FILELIST[*]}]=".taskrc"

# TeXlive
FILELIST[${#FILELIST[*]}]="$(find texmf -type f|grep -vi 'moderncv/examples\|moderncv/manual\|.bzr')"

# Vim
FILELIST[${#FILELIST[*]}]=".vimrc"

# WMFS
FILELIST[${#FILELIST[*]}]=".config/wmfs"

# Xinit
FILELIST[${#FILELIST[*]}]=".xinitrc"

# Xresource
FILELIST[${#FILELIST[*]}]=".Xresources"

# Xscreensaver
FILELIST[${#FILELIST[*]}]=".xscreensaver"


##==============================================================================
## Archiving
##==============================================================================

if [ "$DEBUG" = "yes" ]; then
	tar -zcvf "$ARCHIVENAME"  -C "$HOME" ${FILELIST[*]} -C "$SCRIPTPATH" "$(basename "$0")" --exclude-vcs
else
	tar ${ARCOPT} "${ARCHIVENAME}.${ARCEXT}"  -C "$HOME" ${FILELIST[*]} -C "$SCRIPTPATH" "$(basename "$0")" --exclude-vcs >/dev/null
fi

##==============================================================================
## Cleaning
##==============================================================================
cd "$OLDPATH"

## Set Debug mode off
if [ "$DEBUG" = "yes" ]; then
	set +x
fi