Support LF linebreaks

[fflaten]

Only recognizes linebreak with CRLF atm.
Should support LF due to more common use with cross-platform scripts.

[mklement0]

@fflaten, as a stopgap, you can patch a current installation of the module as follows:

In ShowPSAst.psm1, as currently available via the gallery, replace:

            $text = [string]$InputObject
            if (Test-Path -LiteralPath $text)
            {
                $path = Resolve-Path $text
                $InputObject = [System.Management.Automation.Language.Parser]::ParseFile($path.ProviderPath, [ref]$null, [ref]$null)
            }
            else
            {
                $InputObject = [System.Management.Automation.Language.Parser]::ParseInput($text, [ref]$null, [ref]$null)
            }

with:

            $text = [string]$InputObject
            if (Test-Path -LiteralPath $text)
            {
                # To also support LF-only files, read the file in full and normalize the newlines to CRLF, 
                # which the WinForms textbox control requires for proper display.
                $text = (Get-Content -Raw -LiteralPath $text) -replace '(?<!\r)\n', "`r`n"
            }
            $InputObject = [System.Management.Automation.Language.Parser]::ParseInput($text, [ref]$null, [ref]$null)

Given the unknown status of this project (as you know), I'm not submitting a PR.

Generally, it would be nice if a cross-platform, console-based re-implementation were to become part of the Microsoft.PowerShell.ConsoleGuiTools tools (which currently provide Out-GridConsoleView and Show-ObjectTree) - see:

• Consider adding a console-based, cross-platform implementation of Show-Ast (module ShowPSAst) PowerShell/ConsoleGuiTools#244

[lzybkr]

@mklement0 - I just don't have much extra time these days.

I should probably just archive the project and hope that someone starts something that works better cross-platform, but I could also consider handing off maintaining this project if someone offered.