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Alec Thomas 2017-09-18 13:59:11 +10:00
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43
README.md
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@ -1,14 +1,32 @@
# Chroma - A general purpose syntax highlighter for Go # Chroma - A general purpose syntax highlighter for Go
Chroma takes source code and other structured text and converts it into syntax Chroma takes source code and other structured text and converts it into syntax
highlighted output, as HTML, ANSI-coloured text, etc. highlighted HTML, ANSI-coloured text, etc.
Chroma is based heavily on [Pygments](http://pygments.org/), and includes Chroma is based heavily on [Pygments](http://pygments.org/), and includes
translaters for Pygments lexers and styles. translaters for Pygments lexers and styles.
## Table of Contents
<!-- MarkdownTOC -->
- [Using the library](#using-the-library)
- [Quick start](#quick-start)
- [Identifying the language](#identifying-the-language)
- [Formatting the output](#formatting-the-output)
- [The HTML formatter](#the-html-formatter)
- [More detail](#more-detail)
- [Lexers](#lexers)
- [Formatters](#formatters)
- [Styles](#styles)
- [Command-line interface](#command-line-interface)
- [What's missing compared to Pygments?](#whats-missing-compared-to-pygments)
<!-- /MarkdownTOC -->
## Using the library ## Using the library
Chroma, like Pygments, has the concept of Chroma, like Pygments, has the concepts of
[lexers](https://github.com/alecthomas/chroma/tree/master/lexers), [lexers](https://github.com/alecthomas/chroma/tree/master/lexers),
[formatters](https://github.com/alecthomas/chroma/tree/master/formatters) and [formatters](https://github.com/alecthomas/chroma/tree/master/formatters) and
[styles](https://github.com/alecthomas/chroma/tree/master/styles). [styles](https://github.com/alecthomas/chroma/tree/master/styles).
@ -102,6 +120,27 @@ contents, err := ioutil.ReadAll(r)
err := lexer.Tokenise(nil, string(contents), writer) err := lexer.Tokenise(nil, string(contents), writer)
``` ```
### The HTML formatter
By default the `html` registered formatter generates standalone HTML with
embedded CSS. More flexibility is available through the `lexers/html` package.
Firstly, the output generated by the formatter can be customised with the
following constructor options:
- `Standalone()` - generate standalone HTML with embedded CSS.
- `WithClasses()` - use classes rather than inlined style attributes.
- `ClassPrefix(prefix)` - prefix each generated CSS class.
If `WithClasses()` is used, the corresponding CSS can be obtained from the formatter with:
```go
formatter := html.New(html.WithClasses())
err := formatter.WriteCSS(w, style)
```
## More detail
### Lexers ### Lexers
See the [Pygments documentation](http://pygments.org/docs/lexerdevelopment/) See the [Pygments documentation](http://pygments.org/docs/lexerdevelopment/)

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cmd/chroma/main.go
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@ -77,7 +77,7 @@ command, for Go.
} }
if *htmlStylesFlag { if *htmlStylesFlag {
formatter := html.New(html.WithClasses()) formatter := html.New(html.WithClasses())
formatter.WriteStyles(w, styles.Get(*styleFlag)) formatter.WriteCSS(w, styles.Get(*styleFlag))
return return
} }
formatters.Register("html", html.New(options...)) formatters.Register("html", html.New(options...))

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formatters/html/html.go
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@ -102,7 +102,7 @@ func (h *HTMLFormatter) formatWithClasses(w io.Writer, style *chroma.Style) (fun
fmt.Fprint(w, "<html>\n") fmt.Fprint(w, "<html>\n")
} }
fmt.Fprint(w, "<style type=\"text/css\">\n") fmt.Fprint(w, "<style type=\"text/css\">\n")
h.WriteStyles(w, style) h.WriteCSS(w, style)
if h.standalone { if h.standalone {
fmt.Fprintf(w, "body { %s; }\n", classes[chroma.Background]) fmt.Fprintf(w, "body { %s; }\n", classes[chroma.Background])
} }
@ -136,10 +136,12 @@ func (h *HTMLFormatter) formatWithClasses(w io.Writer, style *chroma.Style) (fun
}, nil }, nil
} }
// WriteStyles writes style definitions (without any surrounding HTML). // WriteCSS writes CSS style definitions (without any surrounding HTML).
func (h *HTMLFormatter) WriteStyles(w io.Writer, style *chroma.Style) { func (h *HTMLFormatter) WriteCSS(w io.Writer, style *chroma.Style) error {
classes := h.typeStyles(style) classes := h.typeStyles(style)
fmt.Fprintf(w, "/* %s */ .chroma { %s }\n", chroma.Background, classes[chroma.Background]) if _, err := fmt.Fprintf(w, "/* %s */ .chroma { %s }\n", chroma.Background, classes[chroma.Background]); err != nil {
return err
}
tts := []int{} tts := []int{}
for tt := range classes { for tt := range classes {
tts = append(tts, int(tt)) tts = append(tts, int(tt))
@ -151,8 +153,11 @@ func (h *HTMLFormatter) WriteStyles(w io.Writer, style *chroma.Style) {
if tt < 0 { if tt < 0 {
continue continue
} }
fmt.Fprintf(w, "/* %s */ .chroma .%ss%x { %s }\n", tt, h.prefix, int(tt), styles) if _, err := fmt.Fprintf(w, "/* %s */ .chroma .%ss%x { %s }\n", tt, h.prefix, int(tt), styles); err != nil {
return err
}
} }
return nil
} }
func (h *HTMLFormatter) typeStyles(style *chroma.Style) map[chroma.TokenType]string { func (h *HTMLFormatter) typeStyles(style *chroma.Style) map[chroma.TokenType]string {