Issue 320 fix?

functions/Get-DatabaseDiskFreeSpace.ps1

@@ -0,0 +1,100 @@
+function Get-DatabaseDiskFreeSpace {
+    <#
+    .SYNOPSIS
+        Returns if there is enough diskspace for the instance to grow for one cycle.
+
+    .DESCRIPTION
+        Returns if there is enough diskspace for the instance to grow for one cycle.
+        The checks is disk based, so the check will be done for each disk where the databases stores files.
+
+    .NOTES
+        Tags: Database, FileSize, FileGrowth
+        Author: Reitse Eskens (@2meterDBA)
+
+    .PARAMETER SqlInstance
+        The Instance for which you want to perform your check
+
+    .PARAMETER SqlCredential
+        Credentials to connect to the SQL Server instance if the calling user doesn't have permission
+
+    .EXAMPLE
+        Get-DatabaseDiskFreeSpace -SqlInstance sql2016
+    #>
+
+[CmdletBinding()]
+
+param (
+        [parameter(ValueFromPipeline)]
+        [DbaInstanceParameter[]]$SqlInstance,
+        [PSCredential]$SqlCredential
+       )
+
+
+begin {
+<#
+    Step one. Get de free diskspace from the disks where Sql Server is parking it's files.
+    The line will get the data from the chosen instance. Next the result is filtered down to just the drive letter for the summation later on.
+    The -unique is used to limit the results. We get a result line for each database file, but all we need is a drive and the free space.
+
+#>
+
+$DiskFreeSpace = Get-DbaDbFile -SqlInstance REITSE-PC\VANTAGE | SELECT @{label='DriveLetter';Expression={$_.PhysicalName.substring(0,3)}}, VolumeFreeSpace |Sort-Object -Property Driveletter -Unique
+
+<#
+    Step two. Determine per drive letter how much growth can be expected.
+    Same concept as the first step, but now we're looking at the file growth.
+#>
+
+$FileGrowth = Get-DbaDbFile -SqlInstance REITSE-PC\VANTAGE | SELECT @{label='DriveLetter';Expression={$_.PhysicalName.substring(0,3)}}, NextGrowthEventSize
+
+<#
+    Step three, summation of the disk growth
+#>
+
+
+$calc = $FileGrowth | Group-Object -Property Driveletter | ForEach-Object -Process {
+    $Sum = $_.group | measure -Sum -Property NextGrowthEventSize
+    [pscustomobject]@{DriveLetter=$_.Name ; value = $Sum.Sum}
+}
+
+<#
+    Step three and a bit, because the summation results in something else than GB, the result is rebuilt to gigabytes 
+#>
+
+
+$CalcInGB = $calc | select DriveLetter, @{name="GrowthInGB" ; Expression={[math]::Round($_.value/1GB, 2)}}
+
+<#
+    Now for the interesting part. Time to compare the results!
+    For each line in the disk free space results, the expected growth will be checked.
+    If the drives are the same, the comparison will take place and the result will be shown.   
+#>
+
+
+$DiskFreeSpace | ForEach-Object -Process {
+    if($_.DriveLetter -cin $CalcInGB.DriveLetter)
+    {
+        $localDisk = $_.DriveLetter
+        $localFileSize = $_.VolumeFreeSpace
+        $CalcInGB | ForEach-Object -Process {
+            If($_.DriveLetter -eq $localDisk)
+            {
+                if($_.GrowthInGB -ge  $localFileSize )
+                {
+                    Write-Host $localDisk 'Don't panic, don't Panic. Time to grow the this disk mr Mainwairing'
+                }
+                else
+                {
+                    Write-Host $localDisk 'Fall in chaps, if you please... yes yes yes you look very smart'
+                }
+
+            }
+          }
+    }
+    else
+    {
+        Write-Host $_.DriveLetter 'Pike! You stupid Boy!'
+    }
+   }
+  }
+}