Merge-Tokens.ps1
|
<#
.SYNOPSIS Replaces tokens in a block of text with a specified value. .DESCRIPTION Replaces tokens in a block of text with a specified value. .PARAMETER template The block of text that contains text and tokens to be replaced. .PARAMETER tokens Token name/value hashtable. .EXAMPLE $content = Get-Content .\template.txt | Merge-Tokens -tokens @{FirstName: 'foo'; LastName: 'bar'} Pass template to function via pipeline. #> function Merge-Tokens() { [CmdletBinding()] param ( [Parameter(Mandatory=$True, ValueFromPipeline=$true)] [AllowEmptyString()] [String] $template, [Parameter(Mandatory=$true)] [HashTable] $tokens ) begin { Write-Verbose "$($MyInvocation.MyCommand.Name)::Begin" } process { Write-Verbose "$($MyInvocation.MyCommand.Name)::Process" # adapted based on this Stackoverflow answer: http://stackoverflow.com/a/29041580/134367 try { [regex]::Replace( $template, '__(?<tokenName>[\w\.]+)__', { # __TOKEN__ param($match) $tokenName = $match.Groups['tokenName'].Value Write-Debug $tokenName $tokenValue = Invoke-Expression "`$tokens.$tokenName" Write-Debug $tokenValue if ($tokenValue) { # there was a value; return it return $tokenValue } else { # non-matching token; return token return $match } }) } catch { Write-Error $_ } } end { Write-Verbose "$($MyInvocation.MyCommand.Name)::End" } } Set-Alias mt Merge-Tokens |