Adding AttributeAST get_ResolvedCommand (#162)

Author: James Brundage

Types/AttributeAST/get_ResolvedCommand.ps1

@@ -0,0 +1,46 @@
+<#
+.SYNOPSIS
+    Resolves an Attribute to a CommandInfo
+.DESCRIPTION
+    Resolves an Attribute to one or more CommandInfo.
+.EXAMPLE
+    {
+        [InvokePipeScript()]$null
+    }.Ast.EndBlock.Statements[0].PipelineElements[0].Expression.Attribute.ResolvedCommand
+.EXAMPLE
+    {
+        [Microsoft.PowerShell.Core.GetCommand()]$null
+    }.Ast.EndBlock.Statements[0].PipelineElements[0].Expression.Attribute.ResolvedCommand
+.EXAMPLE
+    {
+        [Get_Command()]$null
+    }.Ast.EndBlock.Statements[0].PipelineElements[0].Expression.Attribute.ResolvedCommand
+.EXAMPLE
+    {
+        [GetCommand()]$null
+    }.Ast.EndBlock.Statements[0].PipelineElements[0].Expression.Attribute.ResolvedCommand
+.EXAMPLE
+    {
+        [cmd()]$null  
+    }.EndBlock.Statements[0].PipelineElements[0].Expression.Attribute.ResolvedCommand
+#>
+# Get the name of the transpiler.
+$transpilerStepName  = 
+    if ($this.TypeName.IsGeneric) {
+        $this.TypeName.TypeName.Name
+    } else {
+        $this.TypeName.Name
+    }
+$decamelCase = [Regex]::new('(?<=[a-z])(?=[A-Z])')
+@(
+    #    If a Transpiler exists by that name, it will be returned first.
+    Get-Transpiler -TranspilerName $transpilerStepName
+    # Then, any periods in the attribute name will be converted to slashes, 
+    $fullCommandName = $transpilerStepName -replace '\.','\' -replace 
+        '_','-' # and any underscores to dashes.
+
+    # Then, the first CamelCased code will have a - injected in between the CamelCase.    
+    $fullCommandName = $decamelCase.Replace($fullCommandName, '-', 1)
+    # Now we will try to find the command.
+    $ExecutionContext.SessionState.InvokeCommand.GetCommand($fullCommandName, 'All')
+)