Change value of a param in the midst of a function - function

Question

Trying to create a PowerShell function that will output a single-line of text using multiple sets of fore and back colors. I have a switch that defines the color sets.
The function has one param that defines the switch value and another param that, if I can get this working, defines the next color set using the same switch:
function Write-Custom
{
param($Say,$ThenSay,$Level,$ExtraLevel)
switch([array]$level)
{
none {$c = 'Black','White'}
name {$c = 'Cyan','DarkBlue'}
good {$c = 'White','DarkGreen'}
note {$c = 'Gray','White'}
info {$c = 'White','DarkGray'}
warn {$c = 'Yellow','Black'}
fail {$c = 'Black','Red'}
}
$s = " $Say"
$ts = " $ThenSay "
Write-Host $s -ForegroundColor $c[0] -BackgroundColor $c[1] -NoNewLine
Clear-Variable Level
$Level = $ExtraLevel
Write-Host $ts -ForegroundColor $c[0] -BackgroundColor $c[1]
}
Write-Custom -Say 'hi there' -Level 'name' -ThenSay 'stranger ' -ExtraLevel 'warn'
Can't seem to clear and re-define the $level variable. Seems the output ' hi there ' should have a foreground/background of cyan/darkblue, with the ' stranger ' part being yellow/black....but the whole string comes out cyan/darkblue.
Do I need to create a more elaborate switch?

Answer 1

You need to invoke the switch each time to get a different color set. One way to do this is to put a function inside your function e.g.:
function Write-Custom
{
param($Say,$ThenSay,$Level,$ExtraLevel)
function GetColors([string]$level)
{
switch([array]$level)
{
none {'Black','White'}
name {'Cyan','DarkBlue'}
good {'White','DarkGreen'}
note {'Gray','White'}
info {'White','DarkGray'}
warn {'Yellow','Black'}
fail {'Black','Red'}
default { throw "Unrecognized level $level" }
}
}
$c = GetColors($Level)
Write-Host " $Say" -ForegroundColor $c[0] -BackgroundColor $c[1]
$c = GetColors($ExtraLevel)
Write-Host " $ThenSay " -ForegroundColor $c[0] -BackgroundColor $c[1]
}