Compiling LESS different styles

CompileCSS.ps1

function CompileCSS {
	param (
		$DestStyle
	)

	$srcLESSPath = $PSScriptRoot + "\style.less"
	$destCSSPath = $PSScriptRoot + "\style.css"

	$currStyleName
	$destStyleName
	if ($DestStyle -eq 1) {
		$destStyleName = 1
		$currStyleName = 2
	}
	elseif ($DestStyle -eq 2) {
		$destStyleName = 2
		$currStyleName = 1
	}

	# replace style
	(Get-Content $srcLESSPath).Replace('@current-style: ' + $currStyleName, '@current-style: ' + $destStyleName) | Set-Content $srcLESSPath

	# compile
	lessc $srcLESSPath $destCSSPath
}

# https://devblogs.microsoft.com/scripting/use-a-powershell-function-to-see-if-a-command-exists/
function Test-CommandExists {
	Param (
		$Command
	)

	# to avoid printing exception error
	$oldPreference = $ErrorActionPreference
	$ErrorActionPreference = "stop"

	try {if(Get-Command $Command){RETURN $true}}
	Catch {RETURN $false}
	Finally {$ErrorActionPreference=$oldPreference}
}

$destStyle = $args[0]
if (Test-CommandExists("lessc")) {
	CompileCSS($destStyle)
}
else {
	Write-Error "less compiler not found"
}

output1.css

button {
	border-color: #0053a1;
}

output2.css

button {
	border-color: #0e5729;
}

style.less

@current-style: 1; // <- the script replaces this

@1-color: #0053a1;
@2-color: #0e5729;

button {
	border-color: if((@current-style = 1),
			@1-color,
			@2-color);
}