<#
.SYNOPSIS
	Watch the latest headlines
.DESCRIPTION
	This PowerShell script lists the latest headlines by using a RSS (Really Simple Syndication) feed.
.PARAMETER RSS_URL
	Specifies the URL to the RSS feed (Yahoo World News by default)
.PARAMETER lines
	Specifies the initial number of headlines
.PARAMETER timeInterval
	Specifies the time interval in seconds between the Web requests
.EXAMPLE
	PS> ./watch-news.ps1
	❇️ Niger coup: Ecowas deadline sparks anxiety in northern Nigeria ❇️
.LINK
	https://github.com/fleschutz/PowerShell
.NOTES
	Author: Markus Fleschutz | License: CC0
#>

param([string]$RSS_URL = "https://news.yahoo.com/rss/world", [int]$lines = 10, [int]$timeInterval = 30) # in seconds

function PrintLatestHeadlines([string]$previous, [int]$maxLines) {
	[xml]$content = (Invoke-WebRequest -URI $RSS_URL -useBasicParsing).Content
	[string]$latest = ""

	foreach ($item in $content.rss.channel.item) {
		$itemTitle = "$($item.title)"
		if ($latest -eq "") { $latest = $itemTitle }
		if ($itemTitle -eq $previous) { break }

		& "$PSScriptRoot/write-animated.ps1" "❇️ $itemTitle ❇️"
		$maxLines--
		if ($maxLines -eq 0) { break }
	}
	return $latest
}

try {
	$latest = ""
	while ($true) {
		$latest = PrintLatestHeadlines $latest $lines
		Start-Sleep -seconds $timeInterval
	}
	exit 0 # success
} catch {
	"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}