Demo used during PowerShell Podecast

HastilyMadeDemo.ps1

# Make a scriptblock
$scriptBlock = {
  Write-Host "Hello World"
  Get-Fighter -Chill -Name 'Jill'
  Get-Fighter -Chill -Name 'Gilbert'
  Get-Fighter -Name 'Andrew'
  Write-Host "Fighter ready."
}

# Surprise! It's all scriptblocks!

# Look at the AST
$scriptBlock.Ast

# Walk around the block
$scriptBlock.Ast.EndBlock

# Take some statements
$scriptBlock.Ast.EndBlock.Statements

# First statement
$scriptBlock.Ast.EndBlock.Statements[0]

# Look at the elements
$scriptBlock.Ast.EndBlock.Statements[0].PipelineElements

# Command Elements
$scriptBlock.Ast.EndBlock.Statements[0].PipelineElements.CommandElements


# Find all the Commands!
$scriptBlock.Ast.FindAll(
  { "$_ -is [System.Management.Automation.Language.CommandAst]" },
  $false
)

# I just want the fighters
$fighters = $scriptBlock.Ast.FindAll(
  {
    param($Ast)
    $Ast -is [System.Management.Automation.Language.CommandAst] -and
    $Ast.GetCommandName() -eq 'Get-Fighter'
  },
  $false
)

# Only Chill
$fighters | Where-Object {
  $_.CommandElements.Extent.Text -eq '-Chill'
}

# Talk about Extent

# 
$fighters | Where-Object {
  $_.CommandElements.Extent.Text -eq '-Chill'
}
$actualChill = @('Jill')