Created
January 17, 2014 16:49
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A stab at a Powershell Plugin Pattern. In working out how different VM providers can plugin to Boxstarter, I have come up with a pattern for dynamicaly resolving a plugin function. I want to expose a Enable-BoxstarterVM and based on its -Provider argument call the same named functioned available in any same named function loaded. This pattern cr…
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| function Resolve-VMPlugin { | |
| [CmdletBinding()] | |
| [OutputType([BoxstarterConnectionConfig])] | |
| param( | |
| $Provider | |
| ) | |
| DynamicParam { | |
| if(!$provider){$provider="HyperV"} | |
| $module=Get-Module "Boxstarter.$provider" | |
| $command = Get-Command $module\Enable-BoxstarterVM | |
| $metadata=New-Object System.Management.Automation.CommandMetaData($command) | |
| $paramDictionary = new-object ` | |
| -Type System.Management.Automation.RuntimeDefinedParameterDictionary | |
| $metadata.Parameters.Keys | % { | |
| $param=$metadata.Parameters[$_] | |
| $dynParam = new-object ` | |
| -Type System.Management.Automation.RuntimeDefinedParameter($param.Name, $param.ParameterType, $param.Attributes[1]) | |
| $paramDictionary.Add($param.Name, $dynParam) | |
| } | |
| return $paramDictionary | |
| } | |
| Begin{ | |
| $module=Get-Module "Boxstarter.$provider" | |
| $command = Get-Command $module\Enable-BoxstarterVM | |
| $PSBoundParameters.Remove("Provider") | Out-Null | |
| &($command) @PSBoundParameters | |
| } | |
| } | |
| new-alias Enable-BoxstarterVM Resolve-VMPlugin -force |
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