More PowerShell Syntax Highlighting

Vladimir Averkin recently wrote a series of posts that show how to export code with syntax highlighting into HTML and RTF formats. It works great in Outlook, but was causing Windows Live Writer to crash. The reason is that the HTML stream of the clipboard isn’t just a blob of HTML – it’s supposed to be placed into the clipboard as CF_HTML. Investigation of that issue gave enough information to exactly pinpoint the crash in Live Writer, which they were quick to resolve once we pointed out. So it was a positive thing after all :)

While fixing the script, I took the opportunity to make the HTML prettier, work from both the ISE and the command-line, and fix a few bugs. I’ve posted it here: http://www.leeholmes.com/projects/scripts/Set-ClipboardScript.ps1.txt, as well as below.

 

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################################################################################
# Set-ClipboardScript.ps1
#
# The script entire contents of the currently selected editor window to system
# clipboard. The copied data can be pasted into any application that supports
# pasting in UnicodeText, RTF or HTML format. Text pasted in RTF or HTML
# format will be colorized.
#
# See also:
# http://blogs.msdn.com/powershell/archive/2009/01/13/
# how-to-copy-colorized-script-from-powershell-ise.aspx
# http://www.leeholmes.com/blog/SyntaxHighlightingInPowerShell.aspx
# http://www.leeholmes.com/blog/RealtimeSyntaxHighlightingInYourPowerShellConsole.aspx
#
################################################################################

[CmdletBinding()]
param($path)

function Get-ScriptName
{
    $myInvocation.ScriptName
}

if($path -and ([Threading.Thread]::CurrentThread.ApartmentState -ne "STA"))
{
    PowerShell -NoProfile -STA -File (Get-ScriptName) $path
    return
}

$tokenColours = @{
    ‘Attribute’ = ‘#FFADD8E6′
    ‘Command’ = ‘#FF0000FF’
    ‘CommandArgument’ = ‘#FF8A2BE2′
    ‘CommandParameter’ = ‘#FF000080′
    ‘Comment’ = ‘#FF006400′
    ‘GroupEnd’ = ‘#FF000000′
    ‘GroupStart’ = ‘#FF000000′
    ‘Keyword’ = ‘#FF00008B’
    ‘LineContinuation’ = ‘#FF000000′
    ‘LoopLabel’ = ‘#FF00008B’
    ‘Member’ = ‘#FF000000′
    ‘NewLine’ = ‘#FF000000′
    ‘Number’ = ‘#FF800080′
    ‘Operator’ = ‘#FFA9A9A9′
    ‘Position’ = ‘#FF000000′
    ‘StatementSeparator’ = ‘#FF000000′
    ‘String’ = ‘#FF8B0000′
    ‘Type’ = ‘#FF008080′
    ‘Unknown’ = ‘#FF000000′
    ‘Variable’ = ‘#FFFF4500′
}

if($psise)
{
    $tokenColours = $psise.Options.TokenColors
}

Add-Type -Assembly System.Web
Add-Type -Assembly PresentationCore

# Create RTF block from text using named console colors.
function Append-RtfBlock ($block, $tokenColor)
{
    $colorIndex = $rtfColorMap.$tokenColor
    $block = $block.Replace(‘\’,‘\\’).Replace("`r`n","\cf1\par`r`n")
    $block = $block.Replace("`t",‘\tab’).Replace(‘{‘,‘\{‘).Replace(‘}’,‘\}’)
    $null = $rtfBuilder.Append("\cf$colorIndex $block")
}

# Generate an HTML span and append it to HTML string builder
$currentLine = 1
function Append-HtmlSpan ($block, $tokenColor)
{
    if (($tokenColor -eq ‘NewLine’) -or ($tokenColor -eq ‘LineContinuation’))
    {
        if($tokenColor -eq ‘LineContinuation’)
        {
            $null = $codeBuilder.Append(‘`’)
        }
       
        $null = $codeBuilder.Append("<br />`r`n")
        $null = $lineBuilder.Append("{0:000}<BR />" -f $currentLine)
        $SCRIPT:currentLine++
    }
    else
    {
        $block = [System.Web.HttpUtility]::HtmlEncode($block)
        if (-not $block.Trim())
        {
            $block = $block.Replace(‘ ‘, ‘&nbsp;’)
        }

        $htmlColor = $tokenColours[$tokenColor].ToString().Replace(‘#FF’, ‘#’)

        if($tokenColor -eq ‘String’)
        {
            $lines = $block -split "`r`n"
            $block = ""

            $multipleLines = $false
            foreach($line in $lines)
            {
                if($multipleLines)
                {
                    $block += "<BR />`r`n"
                   
                    $null = $lineBuilder.Append("{0:000}<BR />" -f $currentLine)
                    $SCRIPT:currentLine++
                }

                $newText = $line.TrimStart()
                $newText = "&nbsp;" * ($line.Length - $newText.Length) + 
                    $newText
                $block += $newText
                $multipleLines = $true
            }
        }
   
        $null = $codeBuilder.Append(
            "<span style=’color:$htmlColor’>$block</span>")
    }
}

function GetHtmlClipboardFormat($html)
{
    $header = @"
Version:1.0
StartHTML:0000000000
EndHTML:0000000000
StartFragment:0000000000
EndFragment:0000000000
StartSelection:0000000000
EndSelection:0000000000
SourceURL:file:///about:blank
<!DOCTYPE HTML PUBLIC `"-//W3C//DTD HTML 4.0 Transitional//EN`">
<HTML>
<HEAD>
<TITLE>HTML Clipboard</TITLE>
</HEAD>
<BODY>
<!–StartFragment–>
<DIV style=’font-family:Consolas,Lucida Console; font-size:10pt;
    width:750; border:1px solid black; overflow:auto; padding:5px’>
<TABLE BORDER=’0′ cellpadding=’5′ cellspacing=’0′>
<TBODY>
<TR>
    <TD VALIGN=’Top’>
<DIV style=’font-family:Consolas,Lucida Console; font-size:10pt;
    padding:5px; background:#cecece’>
__LINES__
</DIV>
    </TD>
    <TD VALIGN=’Top’ NOWRAP=’NOWRAP’>
<DIV style=’font-family:Consolas,Lucida Console; font-size:10pt;
    padding:5px; background:#fcfcfc’>
__HTML__
</DIV>
    </TD>
</TR>
</TBODY>
</TABLE>
</DIV>
<!–EndFragment–>
</BODY>
</HTML>
"@

    $header = $header.Replace("__LINES__", $lineBuilder.ToString())
    $startFragment = $header.IndexOf("<!–StartFragment–>") +
        "<!–StartFragment–>".Length + 2
    $endFragment = $header.IndexOf("<!–EndFragment–>") +
        $html.Length - "__HTML__".Length
    $startHtml = $header.IndexOf("<!DOCTYPE")
    $endHtml = $header.Length + $html.Length - "__HTML__".Length
    $header = $header -replace "StartHTML:0000000000",
        ("StartHTML:{0:0000000000}" -f $startHtml)
    $header = $header -replace "EndHTML:0000000000",
        ("EndHTML:{0:0000000000}" -f $endHtml)
    $header = $header -replace "StartFragment:0000000000",
        ("StartFragment:{0:0000000000}" -f $startFragment)
    $header = $header -replace "EndFragment:0000000000",
        ("EndFragment:{0:0000000000}" -f $endFragment)
    $header = $header -replace "StartSelection:0000000000",
        ("StartSelection:{0:0000000000}" -f $startFragment)
    $header = $header -replace "EndSelection:0000000000",
        ("EndSelection:{0:0000000000}" -f $endFragment)
    $header = $header.Replace("__HTML__", $html)
   
    Write-Verbose $header
    $header
}

function Main
{
    $text = $null
   
    if($path)
    {
        $text = (Get-Content $path) -join "`r`n"
    }
    else
    {
        if (-not $psise.CurrentOpenedFile)
        {
            Write-Error ‘No script is available for copying.’
            return
        }
       
        $text = $psise.CurrentOpenedFile.Editor.Text
    }

    trap { break }

    # Do syntax parsing.
    $errors = $null
    $tokens = [system.management.automation.psparser]::Tokenize($Text,
        [ref] $errors)

    # Initialize HTML builder.
    $codeBuilder = new-object system.text.stringbuilder
    $lineBuilder = new-object system.text.stringbuilder
    $null = $lineBuilder.Append("{0:000}<BR />" -f $currentLine)
    $SCRIPT:currentLine++
  

    # Initialize RTF builder.
    $rtfBuilder = new-object system.text.stringbuilder
   
    # Append RTF header
    $header = "{\rtf1\fbidis\ansi\ansicpg1252\deff0\deflang1033{\fonttbl" +
        "{\f0\fnil\fcharset0 $fontName;}}"
    $null = $rtfBuilder.Append($header)
    $null = $rtfBuilder.Append("`r`n")

    # Append RTF color table which will contain all Powershell console colors.
    $null = $rtfBuilder.Append("{\colortbl ;")
   
    # Generate RTF color definitions for each token type.
    $rtfColorIndex = 1
    $rtfColors = @{}
    $rtfColorMap = @{}
   
    [Enum]::GetNames([System.Management.Automation.PSTokenType]) | % {
        $tokenColor = $tokenColours[$_];
        $rtfColor = "\red$($tokenColor.R)\green$($tokenColor.G)\blue" +
            "$($tokenColor.B);"
        if ($rtfColors.Keys -notcontains $rtfColor)
        {
            $rtfColors.$rtfColor = $rtfColorIndex
            $null = $rtfBuilder.Append($rtfColor)
            $rtfColorMap.$_ = $rtfColorIndex
            $rtfColorIndex ++
        }
        else
        {
            $rtfColorMap.$_ = $rtfColors.$rtfColor
        }
    }
   
    $null = $rtfBuilder.Append(‘}’)
    $null = $rtfBuilder.Append("`r`n")
   
    # Append RTF document settings.
    $null = $rtfBuilder.Append(‘\viewkind4\uc1\pard\f0\fs20 ‘)
   
    # Iterate over the tokens and set the colors appropriately.
    $position = 0
    foreach ($token in $tokens)
    {
        if ($position -lt $token.Start)
        {
            $block = $text.Substring($position, ($token.Start - $position))
            $tokenColor = ‘Unknown’
            Append-RtfBlock $block $tokenColor
            Append-HtmlSpan $block $tokenColor
        }
       
        $block = $text.Substring($token.Start, $token.Length)
        $tokenColor = $token.Type.ToString()
        Append-RtfBlock $block $tokenColor
        Append-HtmlSpan $block $tokenColor
       
        $position = $token.Start + $token.Length
    }

    # Append RTF ending brace.
    $null = $rtfBuilder.Append(‘}’)
   
    # Copy console screen buffer contents to clipboard in three formats -
    # text, HTML and RTF.
    $dataObject = New-Object Windows.DataObject
    $dataObject.SetText([string]$text, [Windows.TextDataFormat]"UnicodeText")
    $rtf = $rtfBuilder.ToString()
    $dataObject.SetText([string]$rtf, [Windows.TextDataFormat]"Rtf")
    $code = $codeBuilder.ToString()
    $html = GetHtmlClipboardFormat($code)
   
    $dataObject.SetText([string]$html, [Windows.TextDataFormat]"Html")

    [Windows.Clipboard]::SetDataObject($dataObject, $true)
}

. Main

12 Responses to “More PowerShell Syntax Highlighting”

  1. Rolf writes:

    Hi,
    thx for the improved script. Just one minor issue.
    In line 127 $header = @" has one space character after the "

    best regards
    Rolf
    PowerShell Usergroup Germany/Swiss/Austria

  2. c0l0r writes:

    hi,
    great job, thx for this update

    one suggestion though
    if you change line 96 to this: if (($tokenColor -eq ‘String’) -or ($tokenColor -eq ‘Comment’))
    you will handle also the multiline comments correctly ^_^

  3. cz9qvh writes:

    Thanks! this worked really well.

  4. Karl Mitschke writes:

    I added lined 79 and 80 as follows:
    $null = $codeBuilder.Append("<br />`r`n")
    $null = $lineBuilder.Append("<BR />" -f $currentLine)

    This is in:

    if($tokenColor -eq ‘LineContinuation’)
    {
    $null = $codeBuilder.Append(‘`’)
    $null = $codeBuilder.Append("<br />`r`n")
    $null = $lineBuilder.Append("<BR />" -f $currentLine)
    }

    Now lines that are continued don’t get their own line numbers.

    Karl

  5. Karl Mitschke writes:

    I also modified the function Main as follows: (Lines 204 and 210 in your above script, 206 and 212 if you add in my previous additions)

    204 or 206 if (-not $psise.CurrentFile)
    210 or 212 $text = $psise.CurrentFile.Editor.Text

    Karl

  6. Christian Haberl writes:

    Sorry but how do I install this script to ISE?

  7. Karl Mitschke writes:

    Lee;

    I love this script, but I code exclusivly in PowerGUI, so I turned it into a script editor add-on for PowerGUI.

    I thought I’d mention it, since I “borrowed” it from you ;)
    http://www.powergui.org/entry.jspa?externalID=3021&categoryID=389

    Karl

  8. CopyToColorizedHTML–Script Editor Add-on for PowerGUI « Unlock-PowerShell writes:

    [...] on Lee Holmes Set-ClipboardScript located here: http://www.leeholmes.com/blog/2009/02/03/more-powershell-syntax-highlighting/This script editor add-on will copy the current window to HTML ready to post on a blog or web [...]

  9. luke writes:

    Any chance this could be updated to reflect the RTM version of Powershell 2.0?

    And how it might run as a menu item in the ISE?

  10. PowerShell Syntax HighLighting with PowerShell Script « KSBYTES writes:

    [...] tools somehow completely ignored PowerShell, so I found PowerShell scripts that would do the job: PowerShell Syntax Highlighting by Lee Holmes, an extended version by Helge Klein, and different implementation, which will only [...]

  11. Print from PowerShell’s Integrated Scripting Environment « Unlock-PowerShell writes:

    [...] This is based on Lee Holmes Set-ClipboardScript located here: http://www.leeholmes.com/blog/2009/02/03/more-powershell-syntax-highlighting/ [...]

  12. boon keat huat writes:

    thx

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