#!/snap/bin/powershell

# Syntax:       ./write-morse-code.ps1 [<text>]
# Description:	writes the given text in Morse code
# Author:	Markus Fleschutz
# Source:	github.com/fleschutz/PowerShell
# License:	CC0

param([String]$Text)
$OneTimeUnit = 100 # milliseconds

function gap() { param([Int]$Length)
	for ($i = 1; $i -lt $Length; $i++) {
		write-host " " -nonewline
	}
	start-sleep -milliseconds ($Length * $OneTimeUnit)
}

function dot() {
	write-host "." -nonewline
	start-sleep -milliseconds $OneTimeUnit # signal
}

function dash() {
	write-host "_" -nonewline
	start-sleep -milliseconds (3 * $OneTimeUnit) # signal
}

function Char2MorseCode() { param([String]$Char)
	switch($Char) {
	'A' { dot; gap 1; dash; gap 3 }
	'B' { dash; gap 1; dot; gap 1; dot; gap 1; dot; gap 3 }
	'C' { dash; gap 1; dot; gap 1; dash; gap 1; dot; gap 3 }
	'D' { dash; gap 1; dot; gap 1; dot; gap 3 }
	'E' { dot; gap 3 }
	'F' { dot; gap 1; dot; gap 1; dash; gap 1; dot; gap 3 }
	'G' { dash; gap 1; dash; gap 1; dot; gap 3 }
	'H' { dot; gap 1; dot; gap 1; dot; gap 1; dot; gap 3 }
	'I' { dot; gap 1; dot; gap 3 }
	'J' { dot; gap 1; dash; gap 1; dash; gap 1; dash; gap 3 }
	'K' { dash; gap 1; dot; gap 1; dash; gap 3 }
	'L' { dot; gap 1; dash; gap 1; dot; gap 1; dot; gap 3 }
	'M' { dash; gap 1; dash; gap 3 }
	'N' { dash; gap 1; dot; gap 3 }
	'O' { dash; gap 1; dash; gap 1; dash; gap 3 }
	'P' { dot; gap 1; dash; gap 1; dash; gap 1; dot; gap 3 }
	'Q' { dash; gap 1; dash; gap 1; dot; gap 1; dash; gap 3 }
	'R' { dot; gap 1; dash; gap 1; dot; gap 3 }
	'S' { dot; gap 1; dot; gap 1; dot; gap 3 }
	'T' { dash; gap 3 }
	'U' { dot; gap 1; dot; gap 1; dash; gap 3 }
	'V' { dot; gap 1; dot; gap 1; dot; gap 1; dash; gap 3 }
	'W' { dot; gap 1; dash; gap 1; dash; gap 3 }
	'X' { dash; gap 1; dot; gap 1; dot; gap 1; dash; gap 3 }
	'Y' { dash; gap 1; dot; gap 1; dash; gap 1; dash; gap 3 }
	'Z' { dash; gap 1; dash; gap 1; dot; gap 1; dot; gap 3 }
	'1' { dot; gap 1; dash; gap 1; dash; gap 1; dash; gap 1; dash; gap 3 }
	'2' { dot; gap 1; dot; gap 1; dash; gap 1; dash; gap 1; dash; gap 3 }
	'3' { dot; gap 1; dot; gap 1; dot; gap 1; dash; gap 1; dash; gap 3 }
	'4' { dot; gap 1; dot; gap 1; dot; gap 1; dot; gap 1; dash; gap 3 }
	'5' { dot; gap 1; dot; gap 1; dot; gap 1; dot; gap 1; dot; gap 3 }
	'6' { dash; gap 1; dot; gap 1; dot; gap 1; dot; gap 1; dot; gap 3 }
	'7' { dash; gap 1; dash; gap 1; dot; gap 1; dot; gap 1; dot; gap 3 }
	'8' { dash; gap 1; dash; gap 1; dash; gap 1; dot; gap 1; dot; gap 3 }
	'9' { dash; gap 1; dash; gap 1; dash; gap 1; dash; gap 1; dot; gap 3 }
	'0' { dash; gap 1; dash; gap 1; dash; gap 1; dash; gap 1; dash; gap 3 }
	default { gap 7 } # medium gap (between words)
	}
}

try {
	if ($Text -eq "" ) {
		[String]$Text = read-host "Enter text to write"
	}
	[char[]]$ArrayOfChars = $Text.ToUpper()
	foreach($Char in $ArrayOfChars) {
		Char2MorseCode $Char 
	}
	write-host ""
	write-host ""
	exit 0
} catch {
	write-error "ERROR in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}