Prints the page names of the pages on Lokad.com that contains a specific string in their original wiki markup

search-lokadwiki.ps1

#----------------------------------------------------------------
# function Search-LokadWiki
# By Joannes Vermorel, Oct 2015, Lokad
#
# Print all the wiki page names that contains a specific string
# in their wiki code.
#----------------------------------------------------------------
function Search-LokadWiki()
{
    param
    (
    [string]$pattern
    );

    $endpoint = "https://www.lokad.com/rest.aspx?Page=" 
    $url = "https://www.lokad.com/sitemap.aspx"
    [xml]$xml = (new-object System.Net.WebClient).DownloadString($url)
    $pages = $xml.urlset | Foreach {$_.url.loc} | 
                           Foreach { $_ -replace 'https://www.lokad.com/', '' } |
                           Foreach { $_ -replace '/', '.' }

    if(-not (test-path variable:global:wwwlokadcache)) {
        $cache = @{ "" = "" }
        $pages | Foreach { [System.Tuple]::Create($_, (new-object System.Net.WebClient).DownloadString($endpoint + $_)) } |
             Foreach{ $cache.Add([string]$_.Item1, [string]$_.Item2) }
        Set-Variable -name "wwwlokadcache" -value $cache -Scope Global
    }

    $cache = Get-Variable -Name "wwwlokadcache" -Scope Global
    
    $pages | Foreach { [System.Tuple]::Create([string]$_, [string]($cache.Value)[$_]) } |
             Where { $_.Item2.Contains($pattern) } |
             Foreach{ $_.Item1 }
}