Move help from Comment-based to md. Relocate functions (sans help)

ExportedCommands/Select-Worksheet.ps1

@@ -0,0 +1,24 @@
+function Select-Worksheet {
+    param (
+        [Parameter(Mandatory = $true, ValueFromPipeline = $true, ParameterSetName = 'Package', Position = 0)]
+        [OfficeOpenXml.ExcelPackage]$ExcelPackage,
+        [Parameter(Mandatory = $true, ParameterSetName = 'Workbook')]
+        [OfficeOpenXml.ExcelWorkbook]$ExcelWorkbook,
+        [Parameter(ParameterSetName='Package')]
+        [Parameter(ParameterSetName='Workbook')]
+        [string]$WorksheetName,
+        [Parameter(ParameterSetName='Sheet',Mandatory=$true)]
+        [OfficeOpenXml.ExcelWorksheet]$ExcelWorksheet
+    )
+    #if we were given a package, use its workbook
+    if      ($ExcelPackage   -and -not $ExcelWorkbook) {$ExcelWorkbook  = $ExcelPackage.Workbook}
+    #if we now have workbook, get the worksheet; if we were given a sheet get the workbook
+    if      ($ExcelWorkbook  -and $WorksheetName)      {$ExcelWorksheet = $ExcelWorkbook.Worksheets[$WorksheetName]}
+    elseif  ($ExcelWorksheet -and -not $ExcelWorkbook) {$ExcelWorkbook  = $ExcelWorksheet.Workbook ; }
+    #if we didn't get to a worksheet give up. If we did set all works sheets to not selected and then the one we want to selected.
+    if (-not $ExcelWorksheet) {Write-Warning -Message "The worksheet $WorksheetName was not found." ; return }
+    else {
+        foreach ($w in $ExcelWorkbook.Worksheets) {$w.View.TabSelected = $false}
+        $ExcelWorksheet.View.TabSelected = $true
+    }
+}