Rehash: Playing with Window Size gave the core magic for messing with the console window size.  Since then, I’ve seen functions that allow the user to set it to arbitrary values, but I found myself wanting to grow and shrink the window size by some specified delta, e.g. +10 columns, when generating the ‘test pattern’ from yesterdays’ post.  Why not?  The resulting function handles [int], +/-[int], and [float] as arguments to height and width. 

BufferSize?  Well, I just set it to 99999 and leave it there.  I guess you could play with it if you wanted.

function Set-ConsoleSize {
     param (
         [string]$Width = $null,
         [string]$Height = $null,
         [int]$Buffer = $Host.UI.RawUI.BufferSize.Height,

     # Check the host name and exit if the host is not the Windows PowerShell console host.
     if ($host.Name -ne ‘ConsoleHost’) {
         Write-Warning “$((Get-Variable -ValueOnly -Name MyInvocation).MyCommand)runs only in the console host. You cannot run this script in $($Host.Name).”;

     function Read-ArithmeticParameter {
         param ( [int]$Current, [String]$Value, [int]$Max, [string]$Name, [bool]$Force );

         Write-Debug “current: $current Value: $value Max: $Max Name: $name Force: $Force”;
         $lcName = $Name.ToLower();

         if ($Value -match ‘^[+-](\d+)$’) { # value is a +/- modifier
             $delta = $matches[1] -as [int];
             if ($Value[0] -eq ‘+’) {
                 [int]$Value = $Current + $delta;
             else {
                 [int]$Value = $Current  $delta;
         elseif ($Value -match ‘^\d+$’      ) { [int]$Value = $Value; }
         elseif ($delta = $Value -as [float]) { [int]$Value = $Current * $delta; } 
         elseif ($Value -eq ‘Max’           ) { $Value = $Max; }
         else { Write-Warning “Unable to process -$Name ‘$Value'”; return; }

         if (($Value -gt $Max) -and !$Force) {
             Write-Warning “Use -Force to set $lcName greater than max $lcName of $Max”;
             Write-Verbose “-$Name $value”;
             [int]$Value = $Max;
         if ($Value -le 0) { Write-Warning “Cannot set $lcName to less than 0”; return; }

     $currentWidth  = $Host.UI.RawUI.WindowSize.Width;
     $currentHeight = $Host.UI.RawUI.WindowSize.Height;
     $currentBuffer = $Host.UI.RawUI.BufferSize.Height;

     $maxWidth  = $Host.UI.RawUI.MaxPhysicalWindowSize.Width;
     $maxHeight = $Host.UI.RawUI.MaxPhysicalWindowSize.Height;

     if (!$Width)  { $Width  = $currentWidth;  }
     if (!$Height) { $Height = $currentHeight; }

     if (!($Width  = Read-ArithmeticParameter -Current $currentWidth  -Value $Width  -Max $maxWidth  -Name Width  -Force $Force)) { return; }
     if (!($Height = Read-ArithmeticParameter -Current $currentHeight -Value $Height -Max $maxHeight -Name Height -Force $Force)) { return; }

     if ($currentWidth -lt $Width) {
         $host.UI.RawUI.BufferSize = New-Object System.Management.Automation.Host.Size($Width, $Buffer);
         $Host.UI.RawUI.WindowSize = New-Object System.Management.Automation.Host.Size($Width, $Height);
     } else {
         $Host.UI.RawUI.WindowSize = New-Object System.Management.Automation.Host.Size($Width, $Height);
         $host.UI.RawUI.BufferSize = New-Object System.Management.Automation.Host.Size($Width, $Buffer);
     } # if ($currentWidth

     if ($Verbose) { 
         $VerbosePreference = ‘continue’; 
         Write-Verbose “Width:     $Width”;
         Write-Verbose “Height:    $Height”;
         Write-Verbose “Buffer:    $Buffer”;
         Write-Verbose “MaxWidth:  $maxWidth”;
         Write-Verbose “MaxHeight: $maxHeight”;

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