PSTemplate.psm1

<#
.synopsis
    - Fills out a template filled with {{name}} variables using a hash table
.description
    - Template should be formatted as a string, with {{<VariableName>}} used as the tokens to replace
    - Replacements should be in a hash table as <VariableName> = ReplacementValue
.example
    - Fill-Template -Template "simple {{Type}} but could be a here-string" -Variables @{'Type' = 'string'}
    - returns: simple string but could be a here-string 
.parameter Template
    - the template in the form of a string
.parameter Variables
    - the variable key-value pairs to replace
.outputs
    - returns the input Template form with the replacements applied
.notes
    Author: Ben Renninson
    Email: ben@goldensyrupgames.com
    From: https://github.com/GSGBen/PSTemplate
#>
function Invoke-PSTemplate
{
    Param
    (
        [Parameter(Position=0,ValueFromPipeline=$true)][string[]]$Template,
        [Parameter(Position=1,Mandatory=$true)][System.Collections.IDictionary]$Variables
    )

    Begin
    {
        # don't join anything: we want to return the output in the same form as the input
    }

    Process
    {
        $Return = $Template

        $Variables.GetEnumerator() | Select-Object Name,Value | ForEach-Object {
            # this allows "" to go through, but doesn't throw on a fully missing $Template
            if ($null -ne $Return)
            {
                $Return = $Return.Replace("{{$($_.Name)}}",$_.Value)
            }
        }
    
        return $Return    
    }

    End
    {

    }

}

New-Alias -Name Fill-Template -Value Invoke-PSTemplate