Tiny PowerShell helpers for CLIs

cli_return_code.ps1

filter zero_is_true { 
  # incoming value of 0 is mapped to $true, mapped to $false ortherwise
  if(0 -eq $_) { 
      $true 
  } 
  else { 
      $false 
  }
}

filter zero_is_false { 
  # incoming value of 0 is mapped to $true, mapped to $false ortherwise
  if(0 -eq $_) { 
      $false 
  } 
  else { 
      $true
  }
}

filter throw_on_false($msg) {
  # incomiminf value of $false raises an excepition with the given message
    if($false -eq $_) {
        throw $msg
    }
}

filter optional_value($value) {
  # incoming value of $true is mapped to $value, $false produces no value
  if(($null -ne $_) -and ($true -eq $_)) {
      $value
  }
}

wrap_cli.ps1

param($name)
# Create a warpper function for CLI command which dumps the call with itsn parameter to debug stream for easier problem search
$upperName = $name.ToUpper()
"function $($name)_ {"
"    `$global:$($name.ToUpper())_LASTEXITCODE = `$null"
"    `"$($name) `$args`" | Write-Debug"
"    $($name) `$args"
"    `$global:$($name.ToUpper())_LASTEXITCODE = `$LASTEXITCODE"
"    `"$name exitcode: `${global:$($upperName)_LASTEXITCODE}`" | Write-Debug"
"}"