winutil/functions/private/Find-AppsByNameOrDescription.ps1

function Find-AppsByNameOrDescription {
    <#
        .SYNOPSIS
            Searches through the Apps on the Install Tab and hides all entries that do not match the string

        .PARAMETER SearchString
            The string to be searched for
    #>
    param(
        [Parameter(Mandatory=$false)]
        [string]$SearchString = ""
    )
    # Reset the visibility if the search string is empty or the search is cleared
    if ([string]::IsNullOrWhiteSpace($SearchString)) {
        $sync.ItemsControl.Items | ForEach-Object {
            # Each item is a StackPanel container
            $_.Visibility = [Windows.Visibility]::Visible

            if ($_.Children.Count -ge 2) {
                $categoryLabel = $_.Children[0]
                $wrapPanel = $_.Children[1]

                # Keep category label visible
                $categoryLabel.Visibility = [Windows.Visibility]::Visible

                # Respect the collapsed state of categories (indicated by + prefix)
                if ($categoryLabel.Content -like "+*") {
                    $wrapPanel.Visibility = [Windows.Visibility]::Collapsed
                } else {
                    $wrapPanel.Visibility = [Windows.Visibility]::Visible
                }

                # Show all apps within the category
                $wrapPanel.Children | ForEach-Object {
                    $_.Visibility = [Windows.Visibility]::Visible
                }
            }
        }
        return
    }

    # Perform search
    $sync.ItemsControl.Items | ForEach-Object {
        # Each item is a StackPanel container with Children[0] = label, Children[1] = WrapPanel
        if ($_.Children.Count -ge 2) {
            $categoryLabel = $_.Children[0]
            $wrapPanel = $_.Children[1]
            $categoryHasMatch = $false

            # Keep category label visible
            $categoryLabel.Visibility = [Windows.Visibility]::Visible

            # Search through apps in this category
            $wrapPanel.Children | ForEach-Object {
                $appEntry = $sync.configs.applicationsHashtable.$($_.Tag)
                if ($appEntry.Content -like "*$SearchString*" -or $appEntry.Description -like "*$SearchString*") {
                    # Show the App and mark that this category has a match
                    $_.Visibility = [Windows.Visibility]::Visible
                    $categoryHasMatch = $true
                }
                else {
                    $_.Visibility = [Windows.Visibility]::Collapsed
                }
            }

            # If category has matches, show the WrapPanel and update the category label to expanded state
            if ($categoryHasMatch) {
                $wrapPanel.Visibility = [Windows.Visibility]::Visible
                $_.Visibility = [Windows.Visibility]::Visible
                # Update category label to show expanded state (-)
                if ($categoryLabel.Content -like "+*") {
                    $categoryLabel.Content = $categoryLabel.Content -replace "^\+ ", "- "
                }
            } else {
                # Hide the entire category container if no matches
                $_.Visibility = [Windows.Visibility]::Collapsed
            }
        }
    }
}