Method UpdateRules

internal/buffer/buffer.go:817–1011

UpdateRules updates the syntax rules and filetype for this buffer This is called when the colorscheme changes

()

// UpdateRules updates the syntax rules and filetype for this buffer
// This is called when the colorscheme changes
func (b *Buffer) UpdateRules() {
	if !b.Type.Syntax {
		return
	}
	ft := b.Settings["filetype"].(string)
	if ft == "off" {
		b.ClearMatches()
		b.SyntaxDef = nil
		return
	}

	b.SyntaxDef = nil

	// syntaxFileInfo is an internal helper structure
	// to store properties of one single syntax file
	type syntaxFileInfo struct {
		header    *highlight.Header
		fileName  string
		syntaxDef *highlight.Def
	}

	fnameMatches := []syntaxFileInfo{}
	headerMatches := []syntaxFileInfo{}
	syntaxFile := ""
	foundDef := false
	var header *highlight.Header
	// search for the syntax file in the user's custom syntax files
	for _, f := range config.ListRealRuntimeFiles(config.RTSyntax) {
		if f.Name() == "default" {
			continue
		}

		data, err := f.Data()
		if err != nil {
			screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
			continue
		}

		header, err = highlight.MakeHeaderYaml(data)
		if err != nil {
			screen.TermMessage("Error parsing header for syntax file " + f.Name() + ": " + err.Error())
			continue
		}

		matchedFileType := false
		matchedFileName := false
		matchedFileHeader := false

		if ft == "unknown" || ft == "" {
			if header.MatchFileName(b.Path) {
				matchedFileName = true
			}
			if len(fnameMatches) == 0 && header.MatchFileHeader(b.lines[0].data) {
				matchedFileHeader = true
			}
		} else if header.FileType == ft {
			matchedFileType = true
		}