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Published: Dec 3, 2022 License: MIT, BSD-3-Clause Imports: 13 Imported by: 2



gofmt, but for vugu and html files.


  • Match args and output as closely as possible to the original gofmt's general usecase.
  • Wrap around the actual gofmt; don't copy its code here.
  • Format HTML5 in addition to go source.
  • Report correct absolute line numbers and file names in the output.
  • Pure go implementation.


  • Support versions of HTML other than HTML5.


  • Pretty fmt'ing CSS. A lot of CSS these days is generated by a preprocessor like SASS or LESS.


  1. Use to parse the vugu file. This will probably need a tweak to handle the lack of a single root element, missing body, etc. This package has a Render function which re-prints the HTML parse tree, which we will use as the formatted output.
  2. Pass in text data for <script type="application/x-go"> tags into gofmt. Capture its output.


This project took a lot of its code from gofmt and Go's Token file. As such, I'm using the same license as gofmt.



Package vugufmt provides gofmt-like functionality for vugu files.



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func UseGoFmt

func UseGoFmt(simplifyAST bool) func(*Formatter)

UseGoFmt sets the formatter to use gofmt on x-go blocks. Set simplifyAST to true to simplify the AST. This is false by default for gofmt, and is the same as passing in -s for it.

func UseGoImports

func UseGoImports(f *Formatter)

UseGoImports sets the formatter to use goimports on x-go blocks.


type FmtError

type FmtError struct {
	Msg      string
	FileName string
	Line     int
	Column   int

FmtError is a formatting error.

func (FmtError) Error

func (e FmtError) Error() string

type Formatter

type Formatter struct {
	// ScriptFormatters maps script blocks to formatting
	// functions.
	// For each type of script block,
	// we can run it through the supplied function.
	// If the function returns error, we should
	// not accept the output written to the writer.
	// You can add your own custom one for JS, for
	// example. If you want to use gofmt or goimports,
	// see how to apply options in NewFormatter.
	ScriptFormatters map[string]func([]byte) ([]byte, *FmtError)
	// StyleFormatter handles CSS blocks.
	StyleFormatter func([]byte) ([]byte, *FmtError)

Formatter allows you to format vugu files.

func NewFormatter

func NewFormatter(opts ...func(*Formatter)) *Formatter

NewFormatter creates a new formatter. Pass in vugufmt.UseGoFmt to use gofmt. Pass in vugufmt.UseGoImports to use goimports.

func (*Formatter) Diff

func (f *Formatter) Diff(filename string, input io.Reader, output io.Writer) (bool, error)

Diff will show differences between input and what Format() would do. It will return (true, nil) if there is a difference, (false, nil) if there is no difference, and (*, notnil) when the difference can't be determined. filename is optional, but helps with generating useful output.

func (*Formatter) FormatHTML

func (f *Formatter) FormatHTML(filename string, in io.Reader, out io.Writer) error

FormatHTML formats script and css nodes.

func (*Formatter) FormatScript

func (f *Formatter) FormatScript(scriptType string, scriptContent []byte) ([]byte, *FmtError)

FormatScript formats script text nodes.

func (*Formatter) FormatStyle

func (f *Formatter) FormatStyle(styleContent []byte) ([]byte, *FmtError)

FormatStyle formats script text nodes.

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