Completers/Microsoft.AzureRm.Locations.ArgumentCompleters.ps1

$ArgumentCompleter = @{
    Command = @(
            'Add-AlertRule',
            'Add-AutoscaleSetting',
            'Add-AzureRmApiManagementRegion',
            'Get-AzureRmHDInsightProperties',
            'Get-AzureRmStreamAnalyticsQuota',
            'Get-AzureRmVMExtensionImage',
            'Get-AzureRmVMExtensionImageType',
            'Get-AzureRmVMImage',
            'Get-AzureRmVMImageOffer',
            'Get-AzureRmVMImagePublisher',
            'Get-AzureRmVMImageSku',
            'Get-AzureRmVMSize',
            'Get-AzureRmVMUsage',
            'New-AzureRmApiManagement',
            'New-AzureRmApiManagementVirtualNetwork',
            'New-AzureRmApplicationGateway',
            'New-AzureRmAppServicePlan',
            'New-AzureRmAutomationAccount',
            'New-AzureRmAvailabilitySet',
            'New-AzureRmBatchAccount',
            'New-AzureRmDataFactory',
            'New-AzureRmHDInsightCluster',
            'New-AzureRmKeyVault',
            'New-AzureRmLoadBalancer',
            'New-AzureRmLocalNetworkGateway',
            'New-AzureRmNetworkInterface',
            'New-AzureRmNetworkSecurityGroup',
            'New-AzureRmOperationalInsightsWorkspace',
            'New-AzureRmPublicIpAddress',
            'New-AzureRmRedisCache',
            'New-AzureRmResource',
            'New-AzureRmResourceGroup',
            'New-AzureRmRouteTable',
            'New-AzureRmSiteRecoveryVault',
            'New-AzureRmSqlServer',
            'New-AzureRmStorageAccount',
            'New-AzureRmVirtualNetwork',
            'New-AzureRmVirtualNetworkGateway',
            'New-AzureRmVirtualNetworkGatewayConnection',
            'New-AzureRmVM',
            'New-AzureRmWebApp',
            'Remove-AzureRmApiManagementRegion',
            'Set-AzureRmAppServicePlan',
            'Set-AzureRmVMAccessExtension',
            'Set-AzureRmVMCustomScriptExtension',
            'Set-AzureRmVMDiagnosticsExtension',
            'Set-AzureRmVMDscExtension',
            'Set-AzureRmVMExtension',
            'Set-AzureRmVMSqlServerExtension',
            'Test-AzureRmDnsAvailability',
            'Update-AzureRmApiManagementDeployment',
            'Update-AzureRmApiManagementRegion'
    );
    Parameter = 'Location';
    Description = 'Complete the -Location parameter value for Azure Resource Manager cmdlets: New-AzureResource -Location <TAB>';
    ScriptBlock = {
        <#
        .SYNOPSIS
        Auto-complete the -Location parameter value for Azure cmdlets.
    
        .NOTES
        Created by Trevor Sullivan <trevor@trevorsullivan.net>
        http://trevorsullivan.net
        http://twitter.com/pcgeek86
        #>

        param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameter)

        function Get-AllAzureLocations {
            <#
            .Synopsis
            Retrieves a list of Azure locations, using the AzureResourceManager PowerShell module.

            .Description
            This function may be deprecated, or require modification, if the Get-AzureLocation command is changed
            from returning Azure platform features, to returning Azure locations. As of this implementation, the
            ARM Get-AzureLocation command returns a list of Azure Resource Providers as the top-level object.

            NOTE: This argument completer requires that the user be authenticated to Microsoft Azure.
            #>

            [CmdletBinding()]
            param ()

            $LocationList = (AzureResourceManager\Get-AzureRmLocation).Locations | Select-Object -Unique | Sort-Object;
            Write-Output -InputObject $LocationList;
        }

        ### Attempt to read Azure virtual machine details from the cache
        $CacheKey = 'Azure_LocationCache';
        $Cache = Get-CompletionPrivateData -Key $CacheKey;

        ### If there is a valid cache for the Azure virtual machine names, then go ahead and return them immediately
        if ($Cache -and (Get-Date) -gt $Cache.ExpirationTime) {
            return $Cache;
        }

        ### Create fresh completion results for Azure virtual machines
        $ItemList = Get-AllAzureLocations | Where-Object { $PSItem.Name -match $wordToComplete } | ForEach-Object {
            $CompletionResult = @{
                CompletionText = $PSItem;
                ToolTip = $PSItem;
                ListItemText = $PSItem;
                CompletionResultType = [System.Management.Automation.CompletionResultType]::ParameterValue;
                NoQuotes = $false;
                }
            New-CompletionResult @CompletionResult;
        }
    
        ### Update the cache for Azure virtual machines
        Set-CompletionPrivateData -Key $CacheKey -Value $ItemList;

        ### Return the fresh completion results
        return $ItemList;
    }
}

TabExpansion++\Register-ArgumentCompleter @ArgumentCompleter;