yarn-completion

0.1.0

completion.ps1

Register-ArgumentCompleter -Native -CommandName @('yarn', 'yarn.cmd') -ScriptBlock {
    param($wordToComplete, $commandAst, $cursorPosition)

    . $PSScriptRoot\commands.ps1
    . $PSScriptRoot\utils.ps1

    $searchBlock = { $_ -like "$wordToComplete*" }

    $completions = @()

    # Main command
    $mainCommand = if ($commandAst.CommandElements[1]) { $commandAst.CommandElements[1].Value } else { $null }
    # Sub-command or command's options
    $subCommandOrOption = if ($commandAst.CommandElements[2]) { $commandAst.CommandElements[2].Value } else { $null }
    # Sub-command's option or option's value of main command
    $subCommandOptionOrOptionValue = if ($commandAst.CommandElements[3]) { $commandAst.CommandElements[3].Value } else { $null }

    # If word to complete is equal to main command, suggest all commands & options of `install` command
    if (AreEqual $mainCommand $wordToComplete) {
        $completions += $commands | Where-Object $searchBlock | ForEach-Object {
            [System.Management.Automation.CompletionResult]::new($_, $_, 'Command', $_)
        }
        $completions += $options['install'].Keys | Where-Object $searchBlock | ForEach-Object {
            [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterName', $_)
        }
    }
    # If word to complete is equal to sub-command/command's options, suggest sub-commmands and command's options
    elseif (AreEqual $subCommandOrOption $wordToComplete) {
        # Sub-commands
        if ($subCommands[$mainCommand]) {
            $completions += $subCommands[$mainCommand].Keys | Where-Object $searchBlock | ForEach-Object {
                [System.Management.Automation.CompletionResult]::new($_, $_, 'Command', $_)
            }
        }
        # Main command's options
        if ($options[$mainCommand]) {
            $completions += $options[$mainCommand].Keys | Where-Object $searchBlock | ForEach-Object {
                [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterName', $_)
            }
        }
    }
    # If word to complete is equal to main command option's values/sub-command's options,
    # suggest main command option's values or sub-command's options
    elseif (AreEqual $subCommandOptionOrOptionValue $wordToComplete) {
        # Main command option's value
        if ($options[$mainCommand][$subCommandOrOption]) {
            $optionValues = $options[$mainCommand][$subCommandOrOption]

            $completions += $optionValues | Where-Object $searchBlock | ForEach-Object {
                [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterValue', $_)
            }

            # Immediately return if it's command's value completion
            return $completions
        }

        # Sub-command's options
        if ($subCommands[$mainCommand][$subCommandOrOption]) {
            $subCommand = $subCommands[$mainCommand][$subCommandOrOption]
            $subCommandOptionOrOptionValues = if ($subCommand.options) { $subCommand.options.Keys } else { $null }

            $completions += $subCommandOptionOrOptionValues | Where-Object $searchBlock | ForEach-Object {
                [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterName', $_)
            }
        }
    }

    # Always suggest global options
    $completions += $globalOptions | Where-Object $searchBlock | ForEach-Object {
        [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterName', $_)
    }

    return $completions
}