kiln/frontmatter.go

package main

import "bytes"

var (
	frontmatterOpen  = []byte("---")
	frontmatterClose = []byte("\n---")
)

func extractFrontmatter(b []byte) (frontmatter, content []byte) {
	if !bytes.HasPrefix(b, frontmatterOpen) {
		return nil, b
	}
	fm := b[len(frontmatterOpen):]
	if len(fm) != 0 && fm[0] != '\n' {
		return nil, b
	}
	i := bytes.Index(fm, frontmatterClose)
	if i == -1 {
		i = len(fm)
	}
	return fm[:i], b[len(frontmatterOpen)+len(fm):]
}