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A PowerShell example of using a stack for breadcrumb like navigation
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| # Initialize the Stack | |
| $breadCrumb = [System.Collections.Stack]::new() | |
| # Push Page "1" | |
| $breadCrumb.Push(1) | |
| #Initialize empty Pages object | |
| $Pages = @{} | |
| function New-Choice { | |
| [CmdletBinding()] | |
| param ( | |
| [Parameter()] | |
| [String] | |
| $Name, | |
| [Parameter()] | |
| [String] | |
| $Description | |
| ) | |
| New-Object -TypeName 'System.Management.Automation.Host.ChoiceDescription' -ArgumentList $Name, $Description | |
| } | |
| function Request-NextPageFromUser { | |
| [CmdletBinding()] | |
| param ( | |
| [Parameter()] | |
| [String] | |
| $Title, | |
| [Parameter()] | |
| [String] | |
| $Message, | |
| [Parameter()] | |
| [Object[]] | |
| $Options | |
| ) | |
| $responseMap = $Options.ID | |
| $menuOptions = @() | |
| $Options.ForEach{ | |
| $menuOptions += New-Choice -Name "&$($_.Prompt)" -Description $_.Help | |
| } | |
| $menuOptions += Get-BackAndMenuOptions | |
| $responseIndex = $host.ui.PromptForChoice($Title, $Message, $menuOptions, 0) | |
| Update-BreadCrumb -ResponseMap $responseMap -ResponseIndex $responseIndex | |
| } | |
| function New-Page { | |
| [CmdletBinding()] | |
| param ( | |
| [Parameter()] | |
| [String] | |
| $Name, | |
| [Parameter()] | |
| [Int] | |
| $PageID, | |
| [Parameter()] | |
| [scriptblock] | |
| $Function, | |
| [Parameter()] | |
| [String] | |
| $Prompt, | |
| [Parameter()] | |
| [String] | |
| $Help | |
| ) | |
| $Pages[$Name] = @{ | |
| ID = $PageID | |
| Function = $Function | |
| Prompt = $Prompt | |
| Help = $Help | |
| } | |
| } | |
| function Get-BackAndMenuOptions { | |
| @( | |
| New-Choice '&Go Back' 'Go back a page' | |
| New-Choice '&Main Menu' 'Go back to main menu' | |
| ) | |
| } | |
| function Update-BreadCrumb { | |
| [CmdletBinding()] | |
| param ( | |
| [Parameter()] | |
| [Int[]] | |
| $ResponseMap, | |
| [Parameter()] | |
| [Int] | |
| $ResponseIndex | |
| ) | |
| if ($ResponseIndex -ge ($ResponseMap.Count)) { | |
| $tmpIndex = $ResponseIndex - $ResponseMap.Count | |
| switch ($tmpIndex) { | |
| 0 { | |
| #Go Back Option | |
| #Double check that we aren't at the end | |
| if ($breadCrumb.Count -gt 1) { | |
| $breadCrumb.Pop() | Out-Null | |
| } | |
| break | |
| } | |
| 1 { | |
| #Main Menu Option | |
| $breadCrumb.Clear() | |
| $breadCrumb.Push(1) | |
| break | |
| } | |
| } | |
| } else { | |
| $mappedPageID = $ResponseMap[$responseIndex] | |
| # If the pageID is the same, don't add it. We don't want to create a list of the same page | |
| if (-not ($breadCrumb.Peek() -eq $mappedPageID)) { | |
| $breadCrumb.Push($ResponseMap[$responseIndex]) | |
| } | |
| } | |
| } | |
| function PeopleMenu { | |
| $Title = "People Main Menu" | |
| Request-NextPageFromUser -Title $Title -Options @($Pages["ListPeople"]) | |
| } | |
| function ListPeople { | |
| $Title = "List People Page" | |
| $people = @( | |
| "Vex", | |
| "Jaykul", | |
| "Jborean" | |
| "Syrup" | |
| ) | |
| Write-Host $($people -join "`n") | |
| Request-NextPageFromUser -Title $Title -Options @($Pages["ListPeople"]) | |
| } | |
| function CarMenu { | |
| $Title = "Car Main Menu" | |
| Request-NextPageFromUser -Title $Title -Options @($Pages["ListCars"]) | |
| } | |
| function ListCars { | |
| $Title = "List Cars Page" | |
| $cars = @( | |
| "SUV", | |
| "Van", | |
| "Sedan" | |
| ) | |
| Write-Host $($cars -join "`n") | |
| Request-NextPageFromUser -Title $Title -Options @($Pages["ListCars"]) | |
| } | |
| function MainMenu { | |
| $Title = "People and Car Main Menu" | |
| Request-NextPageFromUser -Title $Title -Options @($Pages["CarMenu"], $Pages["PeopleMenu"]) | |
| } | |
| #Define pages for easier reference in script | |
| New-Page -Name 'MainMenu' -PageID 1 -Function $Function:MainMenu -Prompt 'Main Menu' -Help 'Goto the Main Menu' | |
| New-Page -Name 'CarMenu' -PageID 2 -Function $Function:CarMenu -Prompt 'Car Menu' -Help 'Goto the Car Menu' | |
| New-Page -Name 'PeopleMenu' -PageID 3 -Function $Function:PeopleMenu -Prompt 'People Menu' -Help 'Goto the People Menu' | |
| New-Page -Name 'ListCars' -PageID 4 -Function $Function:ListCars -Prompt 'List Cars' -Help 'List all of the cars' | |
| New-Page -Name 'ListPeople' -PageID 5 -Function $Function:ListPeople -Prompt 'List People' -Help 'List all of the people' | |
| $pageFuncMap = @{} | |
| #Map each PageID to it's respective function | |
| $Pages.Values.ForEach{ | |
| $pageFuncMap[$_.ID] = $_.Function | |
| } | |
| while ($true) { | |
| $currentBreadCrumb = $breadCrumb.ToArray() | |
| #Reverse array because a stack is Last In First Out | |
| [array]::Reverse($currentBreadCrumb) | |
| # Get Function Names for this example | |
| $currentBreadCrumbWithNames = $currentBreadCrumb.forEach{ $pageFuncMap[$_].Ast.Name } | |
| Write-Host "Current BreadCrumb: $($currentBreadCrumbWithNames -join ' --> ')" | |
| & $pageFuncMap[$breadCrumb.Peek()] | |
| } |
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