Convert String Variable into Function

Question

I spitted the steps of my setup script into different functions. I want to be able to stop the script sometime. If I restart the script it should continue the last step where I stopped. So I logged the last step in a Tempfile. If I start the script it reads the tempfiles last logged step and jumps to that step on restart.

Function Step1 {
Set-Content -Path $TEMPFILE -value "Step1" #"Setting current step" into a temp file

do first stuff #part in th function. e.g. copy files, add access rights...

Step2 #calling the next function
}

Function Step2 {
Set-Content -Path $TEMPFILE -value "Step2"

do second stuff 

Step3...  
}

...Step 25

On Startup the script checks if a Tempfile is existing and add the last step into a variable[String]

Is there any way to get this String Variable into a "Jump To Function" Sequence? like:...

If ($GETSTEP){
   Write-Host "Continuing with $GETSTEP"
   $GOTO = ${function:GETSTEP}
   &GOTO
   }else{
   Write-Host "GET STARTET"
   Step1
   }

PowerShell version 5.1.14393.3471 ...

Mathias R. Jessen · Accepted Answer · 2020-03-27 11:20:38Z

2

Assuming $GETSTEP contains the script as a string:

if($GETSTEP){
  # Use ScriptBlock.Create() to create a scriptblock from a string
  $scriptBlock = [scriptblock]::Create($GETSTEP)
  &$scriptBlock
}

If $GETSTEP contains the name of a function to execute, then it's much simpler - use the call operator (&) to invoke the function:

if($GETSTEP){
    & $GETSTEP
}

edited Mar 27, 2020 at 11:20

answered Mar 26, 2020 at 14:39

Mathias R. Jessen

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3 Comments

js2010 Over a year ago

And you can say $function:myfunc = $scriptblock

oberpiller Over a year ago

Thanks for your answer! But in ´$GETSTEP´ will be the NAME of the next Function.

Mathias R. Jessen Over a year ago

@oberpiller much simpler then, just do & $GETSTEP then

js2010 · Accepted Answer · 2020-03-27 11:25:02Z

2

This will create the function getstep:

$function:getstep = [scriptblock]::Create($GETSTEP)

answered Mar 27, 2020 at 11:25

js2010

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