eink-weather.sh

#!/usr/bin/env bash

set -euo pipefail

temp_image=$(mktemp /tmp/eink-weather.bmp.XXXXXXXX)

trap 'rm -rf "${temp_image}"' EXIT

pirateweather_api_url="https://api.pirateweather.net/forecast"
pirateweather_api_key="${EINK_WEATHER_PIRATEWEATHER_KEY}"
pirateweather_location="${EINK_WEATHER_PIRATEWEATHER_LOCATION}"
pirateweather_optional_params="?units=si"
pirateweather_request_url="${pirateweather_api_url}/${pirateweather_api_key}/${pirateweather_location}${pirateweather_optional_params}"

background_color="white"
foreground_color="black"

# Get the time.
time=$(date +"%H:%M")

# Get the pirateweather weather.
pirateweather_json=$(curl "${pirateweather_request_url}")

pirateweather_current_temperature=$(echo ${pirateweather_json} | jq '.currently.temperature')
pirateweather_current_temperature=$(printf %.0f ${pirateweather_current_temperature})
pirateweather_current_summary=$(echo ${pirateweather_json} | jq -r '.currently.summary')
pirateweather_hourly_summary=$(echo ${pirateweather_json} | jq -r '.hourly.summary')
pirateweather_daily_summary=$(echo ${pirateweather_json} | jq -r '.daily.summary')

sunrise_today=$(date --date=@$(echo ${pirateweather_json} | jq -r '.daily.data[0].sunriseTime') +'%H:%M')
sunset_today=$(date --date=@$(echo ${pirateweather_json} | jq -r '.daily.data[0].sunsetTime') +'%H:%M')

# Construct the image to be shown.
# Background.
convert \
	-size 600x448 \
	xc:${background_color} \
	bmp:${temp_image}

# Date, sunrise, and sunset.
convert \
	${temp_image} \
	-background none \
	-gravity north \
	-fill ${foreground_color} \
	-font "Iosevka-Bold" \
	-size 600x40 \
	label:"↑${sunrise_today}     $(date +'%A %-d %B %Y')     ${sunset_today}↓" \
	-geometry +0+20 \
	-compose over -composite \
	bmp:${temp_image}

# Time.
convert \
	${temp_image} \
	-background none \
	-gravity north \
	-fill ${foreground_color} \
	-font "Iosevka-Bold" \
	-size 600x280 \
	label:"${time}" \
	-geometry +0+20 \
	-compose over -composite \
	bmp:${temp_image}

# Darksky weather. Temperature and current weather.
convert \
	${temp_image} \
	-background none \
	-gravity north \
	-fill ${foreground_color} \
	-font "Iosevka-Bold" \
	-size 600x60 \
	label:"${pirateweather_current_temperature}° ${pirateweather_hourly_summary}" \
	-geometry +0+280 \
	-compose over -composite \
	bmp:${temp_image}

# Weekly weather
weekdays=$(echo ${pirateweather_json} | jq '.daily.data[].time' | head -n 7 |  xargs -I '{}' date --date=@'{}' +'   %a' | tr -d '\n' | sed 's|^   ||')
convert \
	${temp_image} \
	-background none \
	-gravity north \
	-fill ${foreground_color} \
	-font "Iosevka-Bold" \
	-size 600x36 \
	label:"\\${weekdays}" \
	-geometry +0+340 \
	-compose over -composite \
bmp:${temp_image}

weekday_temperatures_high=$(echo ${pirateweather_json} | jq '.daily.data[].temperatureHigh' | head -n 7 |  xargs -I '{}' printf '%6.0f' '{}' | tr -d '\n' | sed 's|^   ||')
convert \
	${temp_image} \
	-background none \
	-gravity north \
	-fill ${foreground_color} \
	-font "Iosevka-Bold" \
	-size 600x36 \
	label:"\\${weekday_temperatures_high}" \
	-geometry +0+370 \
	-compose over -composite \
bmp:${temp_image}
weekday_temperatures_low=$(echo ${pirateweather_json} | jq '.daily.data[].temperatureLow' | head -n 7 |  xargs -I '{}' printf '%6.0f' '{}' | tr -d '\n' | sed 's|^   ||')
convert \
	${temp_image} \
	-background none \
	-gravity north \
	-fill ${foreground_color} \
	-font "Iosevka-Bold" \
	-size 600x36 \
	label:"\\${weekday_temperatures_low}" \
	-geometry +0+400 \
	-compose over -composite \
bmp:${temp_image}

for i in {0..6}; do
	precip_intensity=$(echo ${pirateweather_json} | jq ".daily.data[${i}].precipIntensity")
	bar_top=$(echo "scale=5; 448 - ($precip_intensity * 100)" | bc)
	bar_left=$((90 + i * 78))
	bar_bottom=448
	bar_right=$((bar_left + 10))
	convert \
		"${temp_image}" \
		-size 600x448 \
		xc:transparent \
		-fill ${foreground_color} \
		-stroke ${background_color} \
		-draw "rectangle ${bar_left},${bar_top}, ${bar_right},${bar_bottom}" \
	    -compose over -composite \
		bmp:${temp_image}
done

# Invert if night.
sunrise_seconds=$(date --date=@$(echo ${pirateweather_json} | jq -r '.daily.data[0].sunriseTime') +'%s')
sunset_seconds=$(date --date=@$(echo ${pirateweather_json} | jq -r '.daily.data[0].sunsetTime') +'%s')
now_seconds=$(date +'%s')
if ((now_seconds <= sunrise_seconds || sunset_seconds <= now_seconds)); then
	convert \
		${temp_image} \
		-negate \
		bmp:${temp_image}
fi

image_color="black"
if ((pirateweather_current_temperature >= 20)); then
	image_color="red"
fi

echo "Displaying \"${temp_image}\" at ${time}"
/home/pi/src/eink-weather/python/main.py \
	"${temp_image}" \
	"${image_color}"