Technique for selectively formatting data in a PowerShell pipeline and output as HTML

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Say that you want to do some fancy formatting of some tabular output from powershell, and the destination is to be html (either for a webserver, or to be sent in an email). Let\

A much faster way:

Ok, I keep promising myself that I won't spend time on solved problems anymore, but ... that switch statement in my second answer was taking over 10 seconds to run on my system, -- because it's doing the "where" stuff in PowerShell instead of in LINQ.

Since PowerShell doesn't support LINQ, I solved it by writing a static helper method in an Add-Type call (and sped up that switch statement by about 1000x):

Add-Type -Language CSharpVersion3 -ReferencedAssemblies System.Xml, System.Xml.Linq -UsingNamespace System.Linq -Name XUtilities -Namespace Huddled -MemberDefinition @"    
    public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> GetElementByIndex( System.Xml.Linq.XContainer doc, System.Xml.Linq.XName element, int index) {
        return from e in doc.Descendants(element) where e.NodesBeforeSelf().Count() == index select e;
    }
    public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> GetElementByValue( System.Xml.Linq.XContainer doc, System.Xml.Linq.XName element, string value) {
        return from e in doc.Descendants(element) where e.Value == value select e;
    }
"@

# Get the running processes to x(ht)ml
$xml = [System.Xml.Linq.XDocument]::Parse( "$(Get-Process | ConvertTo-Html)" )

# Find the index of the column you want to format:
$wsIndex = [Huddled.XUtilities]::GetElementByValue( $xml, "{http://www.w3.org/1999/xhtml}th", "WS" ) | %{ ($_.NodesBeforeSelf() | Measure).Count }


switch([Huddled.XUtilities]::GetElementByIndex( $xml, "{http://www.w3.org/1999/xhtml}td", $wsIndex )) {
   {200MB -lt $_.Value } { $_.SetAttributeValue( "style", "background: red;"); continue } 
   {20MB  -lt $_.Value } { $_.SetAttributeValue( "style", "background: orange;"); continue } 
   {10MB  -lt $_.Value } { $_.SetAttributeValue( "style", "background: yellow;"); continue } 
}

# Save the html out to a file
$xml.Save("$pwd/procs2.html")

# Open the thing in your browser to see what we've wrought
ii .\procs2.html

PowerShell 3:

I redid this in PowerShell 3 after someone linked to this post, and you no longer need the compiled types to get it fast:

Add-Type -AssemblyName System.Xml.Linq

$Process = $(Get-Process | Select Handles, NPM, PM, WS, VM, CPU, Id, ProcessName)

$xml = [System.Xml.Linq.XDocument]::Parse( "$($Process | ConvertTo-Html)" )
if($Namespace = $xml.Root.Attribute("xmlns").Value) {
    $Namespace = "{{{0}}}" -f $Namespace
}

# Find the index of the column you want to format:
$wsIndex = [Array]::IndexOf( $xml.Descendants("${Namespace}th").Value, "WS")

foreach($row in $xml.Descendants("${Namespace}tr")){
    switch(@($row.Descendants("${Namespace}td"))[$wsIndex]) {
       {200MB -lt $_.Value } { $_.SetAttributeValue( "style", "background: red;"); continue } 
       {20MB  -lt $_.Value } { $_.SetAttributeValue( "style", "background: orange;"); continue } 
       {10MB  -lt $_.Value } { $_.SetAttributeValue( "style", "background: yellow;"); continue } 
    }
}
# Save the html out to a file
$xml.Save("$pwd/procs1.html")

# Open the thing in your browser to see what we've wrought
ii .\procs2.html

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小蘑菇

2021-02-02 05:28

As a result of some github discussions, I've updated this for PowerShell 4/5/6 using the .where() method thus eliminating the dependency on the pipeline. The slow part is generating the HTML whereas the actual XML manipulation only takes ~200 ms.

Add-Type -AssemblyName System.Xml.Linq

# Get the running processes to x(ht)ml. This is *SLOW*.
$xml = [System.Xml.Linq.XDocument]::Parse([string] (Get-Process | ConvertTo-Html))

# Find the index of the column you want to format:
$wsIndex = $xml.Descendants("{http://www.w3.org/1999/xhtml}th").
    Where{$_.Value -eq "WS" }.
        NodesBeforeSelf().
            Count

# Format the column based on whatever rules you have:
switch($xml.Descendants("{http://www.w3.org/1999/xhtml}td").Where{@($_.NodesBeforeSelf()).Count -eq $wsIndex} ) {
   {200MB -lt $_.Value } { $_.SetAttributeValue( "style", "background: red;"); continue } 
   {20MB  -lt $_.Value } { $_.SetAttributeValue( "style", "background: orange;"); continue } 
   {10MB  -lt $_.Value } { $_.SetAttributeValue( "style", "background: yellow;"); continue }
}

# Save the html out to a file
$xml.Save("$pwd/procs2.html")

# Open the thing in your browser to see what we've wrought
ii .\procs2.html

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南旧

2021-02-02 05:31

How about using JQuery, and inserting a header with the JQUery script and some styling, like:

Get-Process | ConvertTo-Html -Head @'

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {

   $("table tr td:nth-child(" + ( $("table th:contains('WS')").index() + 1 ) + ")").each(function() {
      if($(this).html() > 209715200) { // 200MB
         $(this).css("background", "red" );
      } else if($(this).html() > 20971520) { // 20MB
         $(this).css("background", "orange" );
      } else if($(this).html() > 10485760) { // 10MB
         $(this).css("background", "yellow" );
      }
   });

})
</script>

'@ | Out-File procs.html; ii .\procs.html

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