Write-FormatViewExpression.ps1
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function Write-FormatViewExpression { <# .Synopsis Writes a Format XML View Expression .Description Writes an expression for a Format .PS1XML. Expressions are used by custom format views and controls to conditionally display content. .Example Write-FormatViewExpression -ScriptBlock { "hello world" } .Example Write-FormatViewExpression -If { $_.Complete } -ScriptBlock { "Complete" } .Example Write-FormatViewExpression -Text 'Hello World' .Example # This will render the property 'Name' property of the underlying object Write-FormatViewExpression -Property Name .Example # This will render the property 'Status' of the current object, # if the current object's 'Complete' property is $false. Write-FormatViewExpression -Property Status -If { -not $_.Complete } #> [CmdletBinding(DefaultParameterSetName='ScriptBlock')] [OutputType([string])] param( # The name of the control. If this is provided, it will be used to display the property or script block. [Parameter(ValueFromPipelineByPropertyName=$true)] [Alias('ActionName','Name')] [String] $ControlName, # If a property name is provided, then the custom action will show the contents # of the property [Parameter(Mandatory=$true,ParameterSetName='Property',Position=0,ValueFromPipelineByPropertyName=$true)] [Alias('PropertyName')] [String] $Property, # If a script block is provided, then the custom action shown in formatting # will be the result of the script block. [Parameter(Mandatory=$true,ParameterSetName='ScriptBlock',Position=0,ValueFromPipelineByPropertyName=$true)] [ScriptBlock] $ScriptBlock, # If provided, will make the expression conditional. -If it returns a value, the script block will run [Parameter(ValueFromPipelineByPropertyName=$true)] [Alias('ItemSelectionCondition')] [ScriptBlock] $If, # If provided, will output the provided text. All other parameters are ignored. [Parameter(Mandatory=$true,ParameterSetName='Text',ValueFromPipelineByPropertyName=$true)] [string] $Text, # If provided, will output a <NewLine /> element. All other parameters are ignored. [Parameter(Mandatory=$true,ParameterSetName='NewLine',ValueFromPipelineByPropertyName=$true)] [switch] $Newline, # If set, will bold the -Text, -Property, or -ScriptBlock. # This is only valid in consoles that support ANSI terminals ($host.UI.SupportsVirtualTerminal), # or while rendering HTML [switch] $Bold, # If set, will underline the -Text, -Property, or -ScriptBlock. # This is only valid in consoles that support ANSI terminals, or in HTML [switch] $Underline, # If set, will invert the -Text, -Property, -or -ScriptBlock # This is only valid in consoles that support ANSI terminals, or in HTML. [switch] $Invert, # If provided, will output the format using this format string. [string] $FormatString, # If this is set, collections will be enumerated. [Parameter(ValueFromPipelineByPropertyName=$true)] [Alias('EnumerateCollection')] [Switch] $Enumerate, # If provided, will display the content using the given foreground color. # This will only be displayed on hosts that support rich color. [Alias('FG', 'ForegroundColour')] [string] $ForegroundColor, # If provided, will display the content using the given background color. # This will only be displayed on hosts that support rich color. [Alias('BG', 'BackgroundColour')] [string] $BackgroundColor, # The number of times the item will be displayed. # With script blocks, the variables $N and $Number will be set to indicate the current iteration. [ValidateRange(1,10kb)] [uint32] $Count = 1) process { # If this is calling itself recursively in ScriptBlock if ($ScriptBlock -and $ScriptBlock -like "*$($MyInvocation.MyCommand.Name)*") { & $ScriptBlock # run the script and return. return } if ($Newline) { foreach ($n in 1..$Count) { "<NewLine/>" } return } foreach ($n in 1..$count) { if ($ForegroundColor -or $BackgroundColor -or $Bold -or $Underline) { $colorize = [ScriptBlock]::Create(". `$SetOutputStyle $(@( if ($ForegroundColor) { "-ForegroundColor '$ForeGroundColor'" } if ($BackgroundColor) { "-BackgroundColor '$BackgroundColor'" } if ($Bold) { '-Bold' } if ($Underline) { '-Underline'} if ($Invert) { '-Invert' } ) -join ' ')") Write-FormatViewExpression -ScriptBlock $colorize } $ControlChunk = if ($ControlName) { "<CustomControlName>$([Security.SecurityElement]::Escape($ControlName))</CustomControlName>" } $EnumerationChunk = if ($Enumerate) { '<EnumerateCollection/>' } else { '' } $formatChunk = if ($FormatString) { "<FormatString>$([Security.SecurityElement]::Escape($FormatString))</FormatString>"} if ($Text) { "<Text>$([Security.SecurityElement]::Escape($Text))</Text>" } else { if ($Count -gt 1 -and $PSBoundParameters.ContainsKey('ScriptBlock')) { $ScriptBlock = [ScriptBlock]::Create("`$n = `$number = $n; $($PSBoundParameters['ScriptBlock']) ") } $formatExpression = @" <ExpressionBinding> $(if ($If) { if ($count -gt 1) { $if = [ScriptBlock]::Create("`$n = `$number = $n; $if") } "<ItemSelectionCondition><ScriptBlock>$([Security.SecurityElement]::Escape($if))</ScriptBlock></ItemSelectionCondition>" }) $(if ($Property) { "<PropertyName>$([Security.SecurityElement]::Escape($Property))</PropertyName>" }) $(if ($ScriptBlock) { "<ScriptBlock>$([Security.SecurityElement]::Escape($ScriptBlock))</ScriptBlock>"}) $EnumerationChunk $formatChunk $ControlChunk </ExpressionBinding> "@ $xml = [xml]$formatExpression if (-not $xml) { return } $xOut=[IO.StringWriter]::new() $xml.Save($xOut) "$xOut".Substring('<?xml version="1.0" encoding="utf-16"?>'.Length + [Environment]::NewLine.Length) $xOut.Dispose() } if ($ForegroundColor -or $BackgroundColor -or $Bold -or $Underline) { $(Write-FormatViewExpression -ScriptBlock ([ScriptBlock]::Create('. $ClearOutputStyle'))) } } } } |