TFL.Powershell.Format-Task.psm1
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# Copyright 2018 Transport for London # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # http://www.apache.org/licenses/LICENSE-2.0 # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Write-Good { $green = @{ Object = [Char]8730 ForegroundColor = "Green" NoNewLine = $true } Write-Host -NoNewLine "[" Write-Host @green Write-Host -NoNewline "]" } function Write-Bad { <# .Synopsis Writes a negative output .Description Writes a negative output with an exception message #> param ( [String] $exceptionMessage ) $red = @{ Object = "x" ForegroundColor = "Red" NoNewLine = $true } Write-Host -NoNewLine "[" Write-Host @red Write-Host "] `($($exceptionMessage)`)" -NoNewline } function AreWeNotVSTS { return $false # We should consider acting differently based on other environments # return $env:VSTS_PROCESS_LOOKUP_ID -eq $null } function Format-ElapsedTimeString { <# .Synopsis Formats the elapsed time object #> param ( [TimeSpan] $timeSpan ) # TODO: Make this scale better to longer times return "$([System.Math]::Round($timeSpan.TotalMilliseconds, 2)) ms" } function Format-Task { <# .Synopsis Formats a sub-task neatly .Description Formats a sub-task neatly with additional output and better handling of returned objects and exceptions #> [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [AllowEmptyString()] [AllowEmptyCollection()] [AllowNull()] [String] $Message, [Parameter(Mandatory = $true)] [scriptblock] $ScriptBlock, [Parameter(Mandatory = $false)] [switch] $NoResult, [Parameter(Mandatory = $false)] [switch] $NoReturn ) $pre = $ErrorActionPreference if (-Not ($script:TabLevel)) { $script:TabLevel = 0 } $tabPrefix = " " * $script:TabLevel $ret = $null $dots = "-" * ([Math]::Max($message.Length, $host.UI.RawUI.BufferSize.Width) - ($tabPrefix.Length)) $stopWatch = New-Object -TypeName System.Diagnostics.Stopwatch try { $script:TabLevel = $script:TabLevel + 1 # Override the error-action to help us pick up exceptions $ErrorActionPreference = "Stop" # Print header if (AreWeNotVSTS -and $host.UI.SupportsVirtualTerminal) { Write-Host "$($tabPrefix)$($Message): " -NoNewline $origPos = $host.UI.RawUI.CursorPosition Write-Host } else { Write-Host Write-Host "$($tabPrefix)$($Message)" Write-Host "$($tabPrefix)$($dots)" } # Execute the script $stopWatch.Start() $ret = Invoke-Command -ScriptBlock $ScriptBlock $stopWatch.Stop() # Derive the time-taken $elapsedTime = Format-ElapsedTimeString $stopWatch.Elapsed # Print footer if (AreWeNotVSTS -and $host.UI.SupportsVirtualTerminal) { $pre = $host.UI.RawUI.CursorPosition $host.UI.RawUI.CursorPosition = $origPos Write-Good if (($null -ne $ret) -and ($noResult -eq $false)) { Write-Host " - Result: $($ret), Time: $($elapsedTime)" } $host.UI.RawUI.CursorPosition = $pre } else { # If there is a result, and we are supposed to output it if (($null -ne $ret) -and ($NoResult -eq $false)) { Write-Host "$($tabPrefix)Result: $($ret)" } Write-Host "$($tabPrefix)Time: $($elapsedTime)" Write-Host "$($tabPrefix)Success: " -NoNewline Print-Good Write-Host Write-Host } if ($NoReturn) { return } else { return $ret } } catch { $stopWatch.Stop() # Derive the time-taken $elapsedTime = Format-ElapsedTimeString $stopWatch.Elapsed # Print footer if (AreWeNotVSTS -and $host.UI.SupportsVirtualTerminal) { $pre = $host.UI.RawUI.CursorPosition $host.UI.RawUI.CursorPosition = $origPos Write-Bad $_.Exception Write-Host " - Time: $($elapsedTime)" $host.UI.RawUI.CursorPosition = $pre } else { Write-Host "$($tabPrefix)Time: $($elapsedTime)" Write-Host "$($tabPrefix)Fail: " -NoNewline Print-Bad $_.Exception Write-Host Write-Host } throw } finally { $ErrorActionPreference = $pre $script:TabLevel = $script:TabLevel - 1 } } Export-ModuleMember -Function Format-Task |