87 lines
1.7 KiB
Go
87 lines
1.7 KiB
Go
package tty
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import (
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"io"
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"strings"
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"github.com/alecthomas/chroma/v2"
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"github.com/alecthomas/chroma/v2/formatters"
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"github.com/alecthomas/chroma/v2/lexers"
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"github.com/alecthomas/chroma/v2/styles"
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)
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type ChromaHighlighter struct {
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lexer chroma.Lexer
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formatter chroma.Formatter
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style *chroma.Style
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}
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func NewChromaHighlighter(lang, format, style string) *ChromaHighlighter {
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l := lexers.Get(lang)
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if l == nil {
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l = lexers.Fallback
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}
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l = chroma.Coalesce(l)
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f := formatters.Get(format)
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if f == nil {
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f = formatters.Fallback
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}
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s := styles.Get(style)
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if s == nil {
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s = styles.Fallback
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}
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return &ChromaHighlighter{
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lexer: l,
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formatter: f,
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style: s,
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}
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}
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func (s *ChromaHighlighter) Highlight(w io.Writer, text string) error {
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it, err := s.lexer.Tokenise(nil, text)
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if err != nil {
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return err
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}
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return s.formatter.Format(w, s.style, it)
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}
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func (s *ChromaHighlighter) HighlightS(text string) (string, error) {
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it, err := s.lexer.Tokenise(nil, text)
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if err != nil {
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return "", err
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}
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sb := strings.Builder{}
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sb.Grow(len(text) * 2)
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s.formatter.Format(&sb, s.style, it)
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return sb.String(), nil
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}
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func (s *ChromaHighlighter) HighlightLang(w io.Writer, text string, lang string) (error) {
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l := lexers.Get(lang)
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if l == nil {
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l = lexers.Fallback
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}
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l = chroma.Coalesce(l)
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old := s.lexer
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s.lexer = l
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err := s.Highlight(w, text)
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s.lexer = old
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return err
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}
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func (s *ChromaHighlighter) HighlightLangS(text string, lang string) (string, error) {
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l := lexers.Get(lang)
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if l == nil {
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l = lexers.Fallback
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}
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l = chroma.Coalesce(l)
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old := s.lexer
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s.lexer = l
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highlighted, err := s.HighlightS(text)
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s.lexer = old
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return highlighted, err
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}
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