Add functions for configuration data handling and extend template merging capabilities

Private/Merge-ConfigurationDataTemplateFile.ps1

@@ -0,0 +1,49 @@
+function Merge-ConfigurationDataTemplateFile {
+    [CmdletBinding()]
+    Param(
+        [Parameter(Mandatory=$true)]
+        [string[]]
+        $Path,
+
+        [Parameter(Mandatory=$false)]
+        [switch]
+        $PassThru
+    )
+
+    $MergeFiles = @()
+    $AddedFiles = @{}
+
+    foreach($Item in $Path){
+        foreach($File in @(Get-ConfigurationDataTemplateMergeFile -Path $Item)){
+            if(-not $AddedFiles.ContainsKey($File)){
+                $MergeFiles += $File
+                $AddedFiles[$File] = $true
+            }
+        }
+    }
+
+    $MergedConfigurationData = $null
+    foreach($File in $MergeFiles){
+        $TemplateData = Import-PowerShellDataFile -Path $File
+        if($null -eq $MergedConfigurationData){
+            $MergedConfigurationData = Copy-ConfigurationDataValue -Value $TemplateData
+            if($MergedConfigurationData -is [System.Collections.IDictionary] -and (Test-ConfigurationDataDictionaryKey -Dictionary $MergedConfigurationData -Key "Metadata")){
+                $MergedConfigurationData.Remove("Metadata")
+            }
+        }else{
+            $MergedConfigurationData = Merge-DSCConfigurationData -Template $MergedConfigurationData -Deployment $TemplateData
+            if($MergedConfigurationData -is [System.Collections.IDictionary] -and (Test-ConfigurationDataDictionaryKey -Dictionary $MergedConfigurationData -Key "Metadata")){
+                $MergedConfigurationData.Remove("Metadata")
+            }
+        }
+    }
+
+    if($PassThru){
+        return [PSCustomObject]@{
+            Files = $MergeFiles
+            ConfigurationData = $MergedConfigurationData
+        }
+    }
+
+    return $MergedConfigurationData
+}