Fix some logic issue in 'Set-WinUtilUITheme.ps1' Private Function - Rename 'Set-WinUtilUiTheme.ps1' -> 'Set-WinUtilUITheme.ps1'

functions/private/Set-WinUtilUITheme.ps1

@@ -0,0 +1,74 @@
+function Set-WinUtilUITheme {
+    <#
+        .SYNOPSIS
+            Sets the theme of the XAML file
+
+        .PARAMETER inputXML
+            A string representing the XAML object to modify
+
+        .PARAMETER customThemeName
+            The name of the custom theme to set the XAML to. Defaults to 'matrix'
+
+        .PARAMETER defaultThemeName
+            The name of the default theme to use when setting the XAML. Defaults to '_default'
+
+        .EXAMPLE
+            Set-WinUtilUITheme -inputXAML $inputXAML
+    #>
+
+    param (
+        [Parameter(Mandatory, position=0)]
+        [string]$inputXML,
+
+        [Parameter(position=1)]
+        [string]$customThemeName = 'matrix',
+
+        [Parameter(position=2)]
+        [string]$defaultThemeName = '_default'
+    )
+
+    try {
+        # Note:
+        #    Reason behind not caching the '$sync.configs.themes` object into a variable,
+        #    because this code can modify the themes object.. meaning it's better to access it
+        #    using the more verbose way, rather than introduce possible bugs into the code, just for the sake of readability.
+        #
+        if (-NOT $sync.configs.themes) {
+            throw [GenericException]::new("[Set-WinUtilTheme] Did not find 'config.themes' inside `$sync variable.")
+        }
+
+        if (-NOT $sync.configs.themes.$defaultThemeName) {
+            throw [GenericException]::new("[Set-WinUtilTheme] Did not find '$defaultThemeName' theme in the themes config file.")
+        }
+
+        if ($sync.configs.themes.$customThemeName) {
+            # Loop through every default theme option, and modify the custom theme in $sync variable,
+            # so that it has full options available for other functions to use.
+            foreach ($option in $sync.configs.themes.$defaultThemeName.PSObject.Properties) {
+                $optionName = $option.Name
+                $optionValue = $option.Value
+                if (-NOT $sync.configs.themes.$customThemeName.$optionName) {
+                    $sync.configs.themes.$customThemeName | Add-Member -MemberType NoteProperty -Name $optionName -Value $optionValue
+                }
+            }
+        } else {
+            Write-Debug "[Set-WinUtilTheme] Theme '$customThemeName' was not found."
+        }
+
+        foreach ($property in $sync.configs.themes.$customThemeName.PSObject.Properties) {
+            $key = $property.Name
+            $value = $property.Value
+            # Add curly braces around the key
+            $formattedKey = "{$key}"
+            # Replace the key with the value in the input XML
+            $inputXML = $inputXML.Replace($formattedKey, $value)
+        }
+    }
+    catch {
+        Write-Debug "[Set-WinUtilTheme] Unable to apply theme"
+        Write-Debug $psitem.Exception.Message
+        $inputXML = "" # Make inputXML equal an empty string, indicating something went wrong to the function caller.
+    }
+
+    return $inputXML;
+}