Powershell script for extracting YAMLS out of Jekyll files

YAML extractor

#Script for extractingn YAML of .html files.
#The extracted content is put in a directory YAMLS <websiteroot>/ignored/YAMLS

if(-Not (Test-Path (Join-Path $PSScriptRoot -ChildPath "ignored"))){
	throw "It is assumed that a directory ignored exists"
}
function ContainsYAML([string] $htmlFile){
    $lines = Get-Content $htmlFile
    $lineCount = $lines.Length - 1
    $indices = (0 .. $lineCount)
    $indices | Where-Object{
        $lines[$_].StartsWith("---")
    }
}

$yamlFolder = Join-Path $PSScriptRoot -ChildPath "ignored/YAMLS"

if(Test-Path $yamlFolder){
    Write-Output "Wipe out content in" $yamlFolder
    Remove-Item $yamlFolder -Recurse
}

New-Item $yamlFolder -ItemType "directory"

Get-ChildItem -Path $PSScriptRoot -Include "*.html" -R | Where-Object {
	-Not ($_.FullName.Contains("ignored"))
} | Where-Object {
    $indices = ContainsYAML $_.FullName 
    $indices.Length -eq 2
} | ForEach-Object{
    Write-Host "Extracting YAML in " $_.FullName
    $indices = ContainsYAML $_
    
    $name = (Join-Path $yamlFolder -ChildPath ($_.FullName.Substring($PSScriptRoot.Length))).ToString()
   
    $dirName = [System.IO.Path]::GetDirectoryName($name)
    If(-Not (Test-Path($dirName))){
        Write-Host "Create directory " $dirName 
        New-Item $dirName -ItemType "directory"
    }
    Write-Host "Create file " $name
    New-Item -Path $name -ItemType "file"

    $lines = Get-Content $_
    Write-Host "Write " ($indices[1] - $indices[0] + 1) " lines"
    for($i = $indices[0]; $i -le $indices[1];$i++){
        Add-Content $name -Value $lines[$i]
    }
}