Added weather-alert.ps1

README.md

@@ -36,6 +36,7 @@ The following PowerShell scripts can be found in the `Scripts/` subfolder:
 * [txt2wav.ps1](Scripts/txt2wav.ps1) - converts text into a audio .WAV file
 * [validate-xml.ps1](Scripts/validate-xml.ps1) - validates the given XML file
 * [weather.ps1](Scripts/weather.ps1) - prints the current weather forecast
+* [weather-alert.ps1](Scripts/weather-alert.ps1) - checks the current weather for critical values
 * [weather-report.ps1](Scripts/weather-report.ps1) - prints the local weather report
 * [weather-worldwide.ps1](Scripts/weather-worldwide.ps1) - prints the current weather of cities world-wide
 * [wakeup.ps1](Scripts/wakeup.ps1) - sends a magic packet to the given computer, waking him up

Scripts/weather-alert.ps1

@@ -0,0 +1,36 @@
+#!/snap/bin/powershell
+
+# Syntax:	./weather-alert.ps1
+# Description:	checks the current weather for critical values
+# Author:	Markus Fleschutz
+# Source:	github.com/fleschutz/PowerShell
+# License:	CC0
+ 
+$GeoLocation="" # empty means determine automatically
+
+function Check {
+	param ([int]$Value, [int]$Min,  [int]$Max, [string]$Unit)  
+	if ($Value -lt $Min) {
+		return "$Value $Unit !"
+	}
+	if ($Value -gt $Max) {
+		return "$Value $Unit !"
+	}
+	return ""
+}
+
+try {
+	$Weather=(Invoke-WebRequest http://wttr.in/${GeoLocation}?format=j1 -UserAgent "curl" ).Content | ConvertFrom-Json
+
+	$Result+=Check $Weather.current_condition.windspeedKmph 0 48 "km/h"
+	$Result+=Check $Weather.current_condition.temp_C -20 35 "°C"
+	$Result+=Check $Weather.current_condition.uvIndex 0 10 "UV"
+
+	if ($Result -eq "") {
+		echo "Calm weather"
+	} else {
+		echo "WEATHER ALERT: $Result"
+	}
+	exit 0
+} catch { Write-Error $Error[0] }
+exit 1