You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
1.2 KiB
51 lines
1.2 KiB
// Copyright 2020 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package markdown
|
|
|
|
import (
|
|
"errors"
|
|
"strings"
|
|
|
|
"gopkg.in/yaml.v2"
|
|
)
|
|
|
|
func isYAMLSeparator(line string) bool {
|
|
line = strings.TrimSpace(line)
|
|
for i := 0; i < len(line); i++ {
|
|
if line[i] != '-' {
|
|
return false
|
|
}
|
|
}
|
|
return len(line) > 2
|
|
}
|
|
|
|
// ExtractMetadata consumes a markdown file, parses YAML frontmatter,
|
|
// and returns the frontmatter metadata separated from the markdown content
|
|
func ExtractMetadata(contents string, out interface{}) (string, error) {
|
|
var front, body []string
|
|
lines := strings.Split(contents, "\n")
|
|
for idx, line := range lines {
|
|
if idx == 0 {
|
|
// First line has to be a separator
|
|
if !isYAMLSeparator(line) {
|
|
return "", errors.New("frontmatter must start with a separator line")
|
|
}
|
|
continue
|
|
}
|
|
if isYAMLSeparator(line) {
|
|
front, body = lines[1:idx], lines[idx+1:]
|
|
break
|
|
}
|
|
}
|
|
|
|
if len(front) == 0 {
|
|
return "", errors.New("could not determine metadata")
|
|
}
|
|
|
|
if err := yaml.Unmarshal([]byte(strings.Join(front, "\n")), out); err != nil {
|
|
return "", err
|
|
}
|
|
return strings.Join(body, "\n"), nil
|
|
}
|
|
|