Mastering Windows PowerShell Scripting - Third Edition

Argument-completers

Argument-completers have been around in a number of different forms since PowerShell 2. This section focuses on the implementation of argument-completers available in Windows PowerShell 5 and PowerShell Core.

An argument-completer is used by the tab completion system to provide a value for a parameter when Tab is pressed. For example, the Get-Module command cycles though module names when Tab is pressed after the command name. The argument-completer does not restrict the values that may be supplied; it is only used to offer values, to make the use of a command easier for an end user.

An argument-completer is a script block; the script block should accept the following parameters:

• commandName
• parameterName
• wordToComplete ...