package sheet import ( "fmt" "runtime" "strings" "gopkg.in/yaml.v3" ) // Parse parses cheatsheet frontmatter func parse(markdown string) (frontmatter, string, error) { // determine the appropriate line-break for the platform linebreak := "\n" if runtime.GOOS == "windows" { linebreak = "\r\n" } // specify the frontmatter delimiter delim := fmt.Sprintf("---%s", linebreak) // initialize a frontmatter struct var fm frontmatter // if the markdown does not contain frontmatter, pass it through unmodified if !strings.HasPrefix(markdown, delim) { return fm, markdown, nil } // otherwise, split the frontmatter and cheatsheet text parts := strings.SplitN(markdown, delim, 3) // return an error if the frontmatter parses into the wrong number of parts if len(parts) != 3 { return fm, markdown, fmt.Errorf("failed to delimit frontmatter") } // return an error if the YAML cannot be unmarshalled if err := yaml.Unmarshal([]byte(parts[1]), &fm); err != nil { return fm, markdown, fmt.Errorf("failed to unmarshal frontmatter: %v", err) } return fm, parts[2], nil }