function Measure-CmdletBinding {
<#
.SYNOPSIS
    Add CmdletBinding to your function.
.DESCRIPTION
    The CmdletBinding attribute is an attribute of functions that makes them operate like compiled cmdlets written in C#. It provides access to the features of cmdlets.
    You can get more details by running: Get-Help about_Functions_CmdletBinding_Attribute
.EXAMPLE
    Measure-CmdletBinding -FunctionDefinitionAst $FunctionDefinitionAst
.INPUTS
    [System.Management.Automation.Language.FunctionDefinitionAst]
.OUTPUTS
    [Microsoft.Windows.Powershell.ScriptAnalyzer.Generic.DiagnosticRecord[]]
.NOTES
    Reference: Writing Help and Comments, Windows PowerShell Best Practices.
#>
    [CmdletBinding()]
    [OutputType([Microsoft.Windows.Powershell.ScriptAnalyzer.Generic.DiagnosticRecord[]])]
    Param
    (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [System.Management.Automation.Language.FunctionDefinitionAst]
        $FunctionDefinitionAst
    )

    Process {
        $results = @()
        $message = (Get-Help $MyInvocation.MyCommand.Name).Synopsis

        try {
            #region Define predicates to find ASTs.

            # Finds CmdletBinding attribute.
            [ScriptBlock]$predicate = {
                param ([System.Management.Automation.Language.Ast]$Ast)

                [bool]$returnValue = $false

                if ($Ast -is [System.Management.Automation.Language.AttributeAst]) {
                    [System.Management.Automation.Language.AttributeAst]$attrAst = $ast;
                    if ($attrAst.TypeName.Name -eq 'CmdletBinding') {
                        $returnValue = $true
                    }
                }

                return $returnValue
            }

            #endregion

            # Find if the function does not have CmdletBinding attribute
            [System.Management.Automation.Language.AttributeAst[]]$attrAsts = $FunctionDefinitionAst.Find($predicate, $true)
            if (!$attrAsts) {
                $result = New-Object `
                -Typename "Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.DiagnosticRecord" `
                -ArgumentList $message,$FunctionDefinitionAst.Extent,$PSCmdlet.MyInvocation.InvocationName,Warning,$null

                $results += $result
            }

            return $results
        } catch {
            $PSCmdlet.ThrowTerminatingError($PSItem)
        }
    }
}