#!/bin/sh
#
# Set wallpaper for fluxbox.
#
# Copyright (c) 2003 Han Boetes <han@mijncomputer.nl>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# $Id: fbsetbg,v 1.24 2003/12/08 19:31:40 fluxgen Exp $

# Portability notes:
# To guarantee this script works on all platforms that support fluxbox
# please keep the following restrictions in mind:
#
# - don't use if ! command;, use command; if [ $? -ne 0 ];
# - don't use [ -e file ] use [ -r file ]
# - don't use $(), use ``
# - don't use ~, use ${HOME}
# - don't use id -u, use whoami
# - don't use echo -e
# - getopts won't work on all platforms, but the config-file can
#   compensate for that.
# - various software like grep/sed/perl may be not present or not
#   the version you have. for example grep '\W' only works on gnu-grep.
#   Keep this in mind, use bare basic defaults.
# - Do _NOT_ suggest to use #!/bin/bash. Not everybody uses bash.

# TODO purheps: xprop -root _WIN_WORKSPACE
# _NET_CURRENT_DESKTOP

# The wallpapersetter is selected in this order
wpsetters=${wpsetters:=Esetroot wmsetbg feh chbg display qiv xv xsri xli xsetbg} # broken icewmbg'
lastwallpaper=${HOME}/.fluxbox/lastwallpaper


WHOAMI=`whoami`
[ "$WHOAMI" = root ] && PATH=/bin:/usr/bin/:/usr/local/bin:/usr/X11R6/bin

command="`basename \"$0\"`"


# Functions
display_usage() {
    cat << EOF
Usage: $command [-u/-U [wallpapersetter]] [-fFcCtTaA /path/to/wallpaper] [-l] [-h] [-i] [-p]
Use \`\`$command -h'' for a complete help message.

EOF
}

display_help() {
    display_usage
    cat << EOF

Options:

    -f  Set fullscreen wallpaper
    -c  Set centered wallpaper
    -t  Set tiled wallpaper
    -a  Set maximized wallpaper, preserving aspect.
        ( if your bgsetter doesn't support this
          we fall back to -f )
    -u  Use specified wallpapersetter, use no argument to forget

    -F,-C,-T,-A,-U same as uncapsed but without remembering.

    -h  Display this help

    -l  Set previous wallpaper

    -i  Information about selected wallpaper command
    -d  (deprecated, use -i) Debug info
    -p  Tips


Files:

    ~/.fluxbox/lastwallpaper     In this file the wallpaper you set
                                 will be stored, for the -l option:
Environment variables:
    wpsetters   Wallpapersetters to use.
                example:
                  wpsetters=feh fbsetbg wallpaper.jpg

    DISPLAY     The display you want to set the wallpaper on.
                example:
                  DISPLAY=:0.0 fbsetbg -l

EOF
}

display_tips() {
    cat << EOF
Common tips to use with $command:

1) To replace all occurrences of bsetbg with $command in a file use this
   command:

   perl -pi -e 's,([^f]|^)bsetbg,$command,' filename

2) If you want the style to set the wallpaper and you want $command to
   remember the previous wallpaper put this in your ~/.fluxbox/init

   session.screen0.rootCommand:    $command -l

3) Use $command -i to find out what wallpapersetter $command will be
   used and what $command thinks about it.

EOF
}

# ugly code for solaris compat.
case `uname` in
    Linux|*BSD)
        find_it() {
            which $1 > /dev/null 2>&1 && shift && $*
        }
        ;;
    *)
        find_it() {
            file=`which $1 2> /dev/null`
            if [ -x "$file" ]; then
                if [ $# -gt 1 ]; then
                    shift
                    $*
                fi
                return 0
            else
                return 1
            fi
        }
        ;;
esac

message() {
    # echo if we have terminal output, otherwise
    # pop up a window
    if [ -t 1 ]; then
        echo "$command: $@"
    else
        xmessage -center "$command: $@"
    fi
}

remembercommand() {
    grep -vs "|${DISPLAY}$" ${lastwallpaper} > ${lastwallpaper}.tmp
    mv -f ${lastwallpaper}.tmp ${lastwallpaper}
    # Make dir/../../path/file.jpg work
    case $wallpaper in
        # no spaces allowed between the varname and '|'
        /*) echo $option'|'$wallpaper'|'$DISPLAY >> $lastwallpaper ;;
        *)  echo $option'|'$PWD/$wallpaper'|'$DISPLAY >> $lastwallpaper ;;
    esac
}

debugfbsetbg() {
    echo
    echo $debugstory
    echo
    exit 0
}

if [ $# -eq 0 ]; then
    message "no options given"
    display_usage
    exit 1
fi


unset debug setterfromcommandline
# Parse command-line options
while [ $# -gt 0 ]; do
    case "$1" in
        -u)
            if find_it "$2"; then
                grep -v wpsetters $lastwallpaper > ${lastwallpaper}.tmp
                echo "wpsetters $2" >> ${lastwallpaper}.tmp
                mv ${lastwallpaper}.tmp $lastwallpaper
                WPSETTER=$2
                setterfromcommandline=true
            elif [ -z "$2" ]; then
                grep -v wpsetters $lastwallpaper > ${lastwallpaper}.tmp
                mv ${lastwallpaper}.tmp $lastwallpaper
                message "wpsetter removed from historyfile"
                exit 0
            else
                message "Couldn't find \"$2\" for wallpapersetter"
                display_usage
                exit 1
            fi
            shift 2 ;;
        -U)
            if find_it "$2"; then
                WPSETTER=$2
                setterfromcommandline=true
            else
                message "Couldn't find \"$2\" for wallpapersetter"
                display_usage
                exit 1
            fi
            shift 2 ;;
        -d|-i) debug=true
            break ;;
        -a) option='$aspect'
            wallpaper=$2
            break ;;
        -f) option='$full'
            wallpaper=$2
            break ;;
        -c) option='$center'
            wallpaper=$2
            break ;;
        -t) option='$tile'
            wallpaper=$2
            break ;;
        -A) option='$aspect'
            wallpaper=$2
            remember=false
            break ;;
        -F) option='$full'
            wallpaper=$2
            remember=false
            break ;;
        -C) option='$center'
            wallpaper=$2
            remember=false
            break ;;
        -T) option='$tile'
            wallpaper=$2
            remember=false
            break ;;
        -l)
            if [ -r "$lastwallpaper" ]; then
                option=`grep "|${DISPLAY}$"    $lastwallpaper|cut -d'|' -f1`
                wallpaper=`grep "|${DISPLAY}$" $lastwallpaper|cut -d'|' -f2`
                if [ -z "$wallpaper" ]; then
                    message "No previous wallpaper recorded for display ${DISPLAY}"
                    exit 1
                fi
            fi
            remember=false
            break
            ;;
        -p) display_tips ; exit 0 ;;
        -h) display_help ; exit 0 ;;
        --)
            message "$command doesn't recognize -- gnu-longopts."
            message 'Use $command -h for a help message.'
            display_usage
            exit 1 ;;
        -*)
            message "unrecognized option "\`"$1'"
            display_usage
            exit 1
            ;;
        *)
            if [ ! -r "$1" ]; then
                message "$1 isn't an existing wallpaper or a valid option."
                display_usage
                exit 1
            elif [ -z "$1" ]; then
                message 'No wallpaper to set'
                display_usage
                exit 1
            else
                wallpaper=$1
                break
            fi
            ;;
    esac
done

# Find the default wallpapersetter
if [ "$setterfromcommandline" != true ]; then
    wpsetters="`awk '/wpsetters/ {print $2}' $lastwallpaper` $wpsetters"
    for wpsetter in $wpsetters; do
        if find_it $wpsetter; then
            WPSETTER=$wpsetter
            break
        fi
    done
fi

standardrant=\
"$WPSETTER sets the 'wrong' wallpaper. Transparency for fluxbox and
apps like aterm and xchat won't work right with it. Consider installing
feh, wmsetbg (from windowmaker) or Esetroot (from Eterm) and I'll use
them instead."

standardok=\
"$WPSETTER is a nice wallpapersetter. You won't have any problems."

case $WPSETTER in
    chbg)
        full='-once -mode maximize'
        tile='-once -mode tile'
        center='-once -mode center'
        aspect='-once -mode smart -max_grow 100 -max_size 100'
        debugstory="chbg supports all features but it doesn't report errors. I reported this bug to the chbg developers."
        ;;
    xsri)
        full='--center-x --center-y --scale-width=100 --scale-height=100'
        tile='--tile'
        center='--center-x --center-y --color=black'
        aspect='--center-x --center-y --scale-width=100 --scale-height=100 --keep-aspect --color=black'
        debugstory=$standardok
        ;;
    display)
        full="`xwininfo -root 2> /dev/null|grep geom` -window root"
        tile='-window root'
        center='-backdrop -window root'
        aspect=$full
        debugstory=$standardrant
        ;;
    Esetroot)
        full='-scale'
        tile=''
        center='-c'
        aspect='-fit'
        debugstory=$standardok
        ;;
    wmsetbg)
        full='-s -S'
        tile='-t'
        center='-b black -e'
        aspect='-b black -a'
        debugstory=$standardok
        ;;
    xsetbg)
        tile='-border black'
        center='-center -border black'
        aspect='-fullscreen -border black'
        full=$aspect #broken
        debugstory="xsetbg is actually xli. The fillscreen option (-f) is broken, defaults to (-a). $standardrant"
        ;;
    xli)
        tile='-onroot -quiet -border black'
        center='-center -onroot -quiet -border black'
        aspect='-fullscreen -onroot -quiet -border black'
        full=$aspect #broken
        debugstory="The fillscreen option (-f) is broken, defaults to (-a). $standardrant"
        ;;
    qiv)
        full='--root_s'
        tile='--root_t'
        center='--root'
        aspect='-m --root'
        debugstory=$standardrant
        ;;
    xv)
        full='-max -smooth -root -quit'
        tile='-root -quit'
        center='-rmode 5 -root -quit'
        aspect='-maxpect -smooth -root -quit'
        debugstory=$standardrant
        ;;
    feh)
        full='--bg-scale'
        tile='--bg-tile'
        center='--bg-center'
        aspect=$full
        debugstory=$standardok
        ;;
    icewmbg)
        tile='-s'
        full=$tile
        center=$tile
        aspect=$tile
        debugstory="icewmbg does support transparency, but only tiling. And I noticed odd
errormessages with aterm. Don't use it unless you have to."
        ;;
    '')
        message \
"I can't find an app to set the wallpaper with. You can install one in
many many ways but I will give you some simple advice: install Eterm and
you're set. Eterm provides Esetroot and thats a great wallpaper setter. I
recommend you install the package provided by your distro."
        exit 1
        ;;
esac

if [ "$debug" = true ];then
    debugfbsetbg
    exit 0
fi

option=${option:='$full'}

if [ ! -r "$wallpaper" ]; then
    message "Can't find wallpaper $wallpaper"
    exit 1
fi

if [ -z "$DISPLAY" ];then
    message "You are not connected to an X session\nPerhaps you should set the DISPLAY environment variable?"
    exit 1
fi


$WPSETTER `eval echo $option` "$wallpaper"
if [ $? -ne 0 ]; then
    message "Something went wrong while setting the wallpaper.
Run '$WPSETTER "`eval echo $option` $wallpaper"' from an xterm to find out what."
    exit 1
fi

#remember previous wallpaper
if [ ! "$remember" = false ]; then
    remembercommand
fi