#!/bin/sh
###############################################################################
# dwm-set-background
#
# This script sets dwm background.
#
# -----------------------------------------------------------------------------
# DWM Scripts - wrapper for dwm/dmenu/slock
#   (C) 2007-2009 Gerardo García Peña
#   Programmed by Gerardo García Peña
#
#   This program is free software; you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the Free
#   Software Foundation; either version 2 of the License, or (at your option)
#   any later version.
#
#   This program is distributed in the hope that it will be useful, but WITHOUT
#   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
#   more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program; if not, write to the Free Software Foundation, Inc., 51
#   Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#
###############################################################################

. dwm-config-read
BDEF="/usr/share/dwm/default-dwm-background"
for i in jpg png; do
  if [ -e "$BDEF.$i" ]; then
    DEFAULT="$BDEF.$i"
    break;
  fi
done

if [ "$1" = "-h" -o "$1" = "--help" ]; then
  log "Usage:"
  log "  $0 [new-background [disposition]]"
  log "If none parameter is specified, reloads the current background."
  log "If a file is specified, it will be used as new background."
  log "If you specify a file, you can also specify a disposition: center,"
  log "scale, tile o seamless. If not specified, default is scale."
fi

if [ -n "$1" -a ! -r "$1" ]; then
  error "File '$1' does not exist."
  exit 1
fi

if [ -n "$1" ]; then
  log "Installing '$1'..."
  if [ "$2" ]; then
      DISP="$2"
      case "$DISP" in
      center)   ;;
      scale)    ;;
      tile)     ;;
      seamless) ;;
      *) error "Bad disposition '$2'. Using 'scale'." 1>&2
         DISP="scale"
      esac
  else
      DISP="scale"
  fi
  rm -f -- "$HOME/.dwm-background"*
  cp "$1" "$HOME/.dwm-background-$DISP"
fi

if which feh > /dev/null 2>&1; then
  BG=`ls "$HOME/.dwm-background"* 2> /dev/null | head -n1`
  DISP=`echo "$BG" | sed 's#^.*\.dwm-background\([^ .]*\).*$#\1#'`

  case "$DISP" in
  -center)   ;;
  -scale)    ;;
  -tile)     ;;
  -seamless) ;;
  *) DISP="-scale"
  esac

  if [ -z "$BG" -a -e "$DEFAULT" ]; then
    error "No user background found. Using default '$DEFAULT'."
    BG="$DEFAULT"
  fi
  if [ "$BG" ]; then
    log "Using background '$BG' (with disposition --bg$DISP)."
    feh --bg$DISP "$BG"
  fi
else
  error "feh is not installed. Try with apt-get install feh."
fi

exit 0