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Add syntax highlighting to file viewer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| package ui | ||
|
|
||
| import ( | ||
| "io" | ||
| "strings" | ||
|
|
||
| "github.com/alecthomas/chroma" | ||
| "github.com/alecthomas/chroma/formatters" | ||
| "github.com/alecthomas/chroma/lexers" | ||
| "github.com/alecthomas/chroma/styles" | ||
| ) | ||
|
|
||
| const ( | ||
| style = "monokai" | ||
| ) | ||
|
|
||
| var ( | ||
| buff strings.Builder | ||
| backGroundColor string | ||
|
|
||
| // Color formatter. | ||
| Color = formatters.Register("Color", chroma.FormatterFunc(func(w io.Writer, s *chroma.Style, iterator chroma.Iterator) error { | ||
| for t := iterator(); t != chroma.EOF; t = iterator() { | ||
| colour := s.Get(t.Type).Colour | ||
| backGroundColor = s.Get(t.Type).Background.String() | ||
| var sb strings.Builder | ||
|
|
||
| sb.WriteString("[") | ||
| sb.WriteString(colour.String()) | ||
| sb.WriteString("]") | ||
| sb.WriteString(t.Value) | ||
|
|
||
| if _, err := w.Write([]byte(sb.String())); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| })) | ||
| ) | ||
|
|
||
| func Colorize(partialFileContents string, fileContents string, filename string) { | ||
| buff.Reset() | ||
|
|
||
| // attempt to the language from its filename. | ||
| l := lexers.Match(filename) | ||
| if l == nil { | ||
| // otherwise attempt by its partial contents | ||
| l = lexers.Analyse(partialFileContents) | ||
| if l == nil { | ||
| // otherwise attempt by its entire contents | ||
| l = lexers.Analyse(fileContents) | ||
| if l == nil { | ||
| // otherwise fall back to default | ||
| l = lexers.Fallback | ||
| } | ||
| } | ||
| } | ||
| s := styles.Get(style) | ||
| c := Color | ||
| it, err := l.Tokenise(nil, fileContents) | ||
| if err != nil { | ||
| buff.Write([]byte(fileContents)) | ||
| } | ||
| c.Format(&buff, s, it) | ||
| return | ||
| } |
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