powershell task runner

runtask.ps1

# A simple task runner implemented in Powershell

Param(
    [String]$TaskName, # The name of the task to run
    [parameter(ValueFromRemainingArguments=$true)][String[]]$TaskArgs # The list of repos to run the task on
)

# Define the tasks

$tasks = @{}
$tasks.Add('install',@{
        description="Runs Maven `install` with default parameters";
        script = {
            mvn install "-Dcmake.compiler=vc2012"
        }
    })
$tasks.Add('clean',@{
        description="Clean the out-of-source build folder";
        script = {
            Remove-Item -Force -Recurse "build"
        }
    })

# Helper functions

# Some helpful strings for formatting output
$indent = (" " * 4);
$spacer = ("-" * 40);

function DisplayHelpText {
    $help_text = Get-Help $MyInvocation.ScriptName
    $syn = $help_text.Synopsis
    Write-Output "
  Task Runner - runtask TaskName [TaskArgs]

    DisplayTaskList
}
function DisplayTaskList{
    Write-Output "
  List of Tasks:
  $spacer"
    foreach ($task in $tasks.GetEnumerator()) {
        Write-Output "$indent$($task.Key)"
        Write-Output "$($indent * 2)$($task.Value.description)"
    }
}

# Now process the given task name

if (-not $taskname) {
    DisplayHelpText
    exit
}
$task = $tasks.Get_Item($taskname)
if ($task) {
    Invoke-Command $task.script -ArgumentList (,$TaskArgs)
}
else {
    Write-Output "'$taskname' is not a valid task name."
    DisplayTaskList
}