background-weather/background-weather.sh

#!/bin/bash

# background-weather.sh
# Gets a background and sets it depending on the time of day and season.

# Get the true path to the wallpapers directory
if [ -L "$0" ] ; then
    true_file=$(readlink -f "$0");
    base_dir=$( cd "$(dirname "$true_file")" ; pwd -P );
else
    base_dir=$( cd "$(dirname "$0")" ; pwd -P );
fi

# Defaults
WEATHER="clear";
test=false;
LAT=false;
LNG=false;
OW_API_KEY="";
CITY="";
CONFIG="";
IMG_FILE="";
wallpapers_dir="$base_dir/wallpapers";

# Import config file
declare -a configs=(
    "/etc/background-weather.conf"
    "$base_dir/background-weather.conf"
    "/home/$USER/.config/background-weather/background-weather.conf"
)

for config_file in "${configs[@]}"; do
    if [ -f "$config_file" ]; then
        CONFIG="$config_file"
        break;
    fi
done

if [ "$CONFIG" != "" ]; then
    set -a # export all variables from config
    source "$CONFIG"
    set +a # stop exporting
fi

# Get options (override config)
options=$@
arguments=($options)
index=0
for argument in $options ; do
    index=`expr $index + 1`
    case $argument in
        "--weather"|"-w")
            WEATHER="${arguments[index]}"
        ;;
        "--api-key")
            OW_API_KEY="${arguments[index]}"
        ;;
        "--lat")
            LAT="${arguments[index]}"
        ;;
        "--lng")
            LNG="${arguments[index]}"
        ;;
        "--config")
            CONFIG="${arguments[index]}"
        ;;
        "--img")
            IMG_FILE="${arguments[index]}"
        ;;
        "--test"|"-t")
            test="${arguments[index]}"
        ;;
        
    esac
done

if [ "$LAT" != false ] && [ "$LNG" != false ] && [ "$OW_API_KEY" != "" ]; then
    OW_API_URL="https://api.openweathermap.org/data/2.5/weather?lat=$LAT&lon=$LNG&appid=$OW_API_KEY"

    # Get __WEATHER__ from JSON response:
    # e.g {"coord":{"lon":12.345,"lat":12.345},"weather":[{"id":800,"main":"__WEATHER__", ...
    if [ -x "$(command -v jq)" ]; then
        WEATHER=$(curl --silent $OW_API_URL | jq -r '.weather[0].main')
    else
        WEATHER=$(curl --silent "$OW_API_URL" --stderr - \
            | grep -E -o ',"main":"[0-9a-zA-Z]*",' \
            | sed 's/,"main":"//g' \
            | head -c -3)
    fi

    # To lowercase
    WEATHER=$(echo "$WEATHER" | sed -e 's/\(.*\)/\L\1/')
fi

# DOY = Current Day of Year (without leading zeroes)
DOY=$(date '+%-j');

# The current hours from 0 to 23.
HR=$(date '+%-H');

if ((DOY >= 79 && DOY < 172)) ; then
    # March 20 - June 21
    season="spring";
elif ((DOY >= 172 && DOY < 265)) ; then
    # June 21 - September 22
    season="summer";
elif ((DOY >= 265 && DOY < 355)) ; then
    # September 22 - December 21
    season="fall";
else
    # December 21 - March 20
    season="winter";
fi

# TODO: To adjust light according to latitude to modify hours
set -a # export all variables created next

# Get file by hour time
if [ "$IMG_FILE" = "" ]; then
    case "$HR" in
        0) IMG_FILE="00-mid-night.png" ;;
        1) IMG_FILE="01-late-night.png" ;;
        2) IMG_FILE="02-early-vigil.png" ;;
        3) IMG_FILE="03-mid-vigil.png" ;;
        4) IMG_FILE="04-late-vigil.png" ;;
        5) IMG_FILE="05-dawn.png" ;;
        6) IMG_FILE="06-early-morning.png" ;;
        7) IMG_FILE="07-mid-morning.png" ;;
        8) IMG_FILE="08-late-morning.png" ;;
        9) IMG_FILE="09-early-forenoon.png" ;;
        10) IMG_FILE="10-mid-forenoon.png" ;;
        11) IMG_FILE="11-late-forenoon.png" ;;
        12) IMG_FILE="12-noon.png" ;;
        13) IMG_FILE="13-early-afternoon.png" ;;
        14) IMG_FILE="14-mid-afternoon.png" ;;
        15) IMG_FILE="15-late-afternoon.png" ;;
        16) IMG_FILE="16-early-evening.png" ;;
        17) IMG_FILE="17-mid-evening.png" ;;
        18) IMG_FILE="18-late-evening.png" ;;
        19) IMG_FILE="19-early-dusk.png" ;;
        20) IMG_FILE="20-mid-dusk.png" ;;
        21) IMG_FILE="21-late-dusk.png" ;;
        22) IMG_FILE="22-sunset.png" ;;
        23) IMG_FILE="23-early-night.png" ;;
    esac
fi

# Put path together
if [ -f "$wallpapers_dir/$season/$WEATHER/$IMG_FILE" ]; then
    # ./wallpapers/spring/clear/00-filename.png
    img_path="$wallpapers_dir/$season/$WEATHER/$IMG_FILE"

elif [ -f "$wallpapers_dir/$season/$IMG_FILE" ]; then
    # ./wallpapers/spring/00-filename.png
    img_path="$wallpapers_dir/$season/$IMG_FILE"

else
    # ./wallpapers/00-filename.png
    img_path="$wallpapers_dir/$IMG_FILE"
fi

# Check for file
if [ ! -f "$img_path" ]; then
    echo "File dos not exist:"
    echo "$img_path"
    exit 1;
fi

# Check for test mode
if ! [ "$test" = false ] ; then
    echo "Path: $img_path";
    exit;
fi

# Set the background link:

# feh --bg-fill "$img_path"
# ls -n  /etc/alternatives/desktop-background "$img_path"

# (do x11 mambo to set a wallpaper, ugh)
export DISPLAY=:0
export XAUTHORITY="/home/$USER/.Xauthority"
export XDG_RUNTIME_DIR="/run/user/$UID"

if [ -x "$(command -v pcmanfm)" ]; then
    # For Raspbian
    pcmanfm --wallpaper-mode=stretch --set-wallpaper="$img_path"
elif [ -x "$(command -v gsettings)" ]; then
    # Gnome 3.22.2
    gsettings set org.gnome.desktop.background picture-uri "file://$img_path"
elif [ -x "$(command -v xfconf-query)" ]; then
    # XFCE
    xfconf-query --channel xfce4-desktop --property /backdrop/screen0/monitor0/image-path --set $img_path
    xfdesktop --reload
    #xfconf-query --channel xfce4-desktop --list # lists all related properties, in case screen0/monitor0 isn't the one.
elif [ -x "$(command -v feh)" ]; then
    # feh, used sometimes by i3 and AwesomeWM
    feh --bg-scale $img_path
else
    echo "No suitable background manager found."
    echo "File found:"
    echo "$img_path"
fi