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7dfd69cdc5
* chore: make the linter happier * chore: remove reference to maligned linter in .golangci.yml
100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
package templates
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import (
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"encoding/json"
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"fmt"
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"strings"
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"unicode"
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"github.com/naoina/toml"
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"gopkg.in/yaml.v2"
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)
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func extractFrontMatter(input string) (map[string]interface{}, string, error) {
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// get the bounds of the first non-empty line
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var firstLineStart, firstLineEnd int
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lineEmpty := true
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for i, b := range input {
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if b == '\n' {
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firstLineStart = firstLineEnd
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if firstLineStart > 0 {
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firstLineStart++ // skip newline character
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}
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firstLineEnd = i
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if !lineEmpty {
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break
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}
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continue
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}
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lineEmpty = lineEmpty && unicode.IsSpace(b)
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}
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firstLine := input[firstLineStart:firstLineEnd]
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// see what kind of front matter there is, if any
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var closingFence string
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var fmParser func([]byte) (map[string]interface{}, error)
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switch firstLine {
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case yamlFrontMatterFenceOpen:
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fmParser = yamlFrontMatter
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closingFence = yamlFrontMatterFenceClose
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case tomlFrontMatterFenceOpen:
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fmParser = tomlFrontMatter
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closingFence = tomlFrontMatterFenceClose
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case jsonFrontMatterFenceOpen:
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fmParser = jsonFrontMatter
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closingFence = jsonFrontMatterFenceClose
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default:
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// no recognized front matter; whole document is body
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return nil, input, nil
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}
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// find end of front matter
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fmEndFenceStart := strings.Index(input[firstLineEnd:], "\n"+closingFence)
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if fmEndFenceStart < 0 {
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return nil, "", fmt.Errorf("unterminated front matter")
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}
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fmEndFenceStart += firstLineEnd + 1 // add 1 to account for newline
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// extract and parse front matter
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frontMatter := input[firstLineEnd:fmEndFenceStart]
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fm, err := fmParser([]byte(frontMatter))
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if err != nil {
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return nil, "", err
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}
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// the rest is the body
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body := input[fmEndFenceStart+len(closingFence):]
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return fm, body, nil
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}
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func yamlFrontMatter(input []byte) (map[string]interface{}, error) {
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m := make(map[string]interface{})
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err := yaml.Unmarshal(input, &m)
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return m, err
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}
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func tomlFrontMatter(input []byte) (map[string]interface{}, error) {
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m := make(map[string]interface{})
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err := toml.Unmarshal(input, &m)
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return m, err
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}
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func jsonFrontMatter(input []byte) (map[string]interface{}, error) {
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input = append([]byte{'{'}, input...)
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input = append(input, '}')
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m := make(map[string]interface{})
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err := json.Unmarshal(input, &m)
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return m, err
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}
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type parsedMarkdownDoc struct {
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Meta map[string]interface{} `json:"meta,omitempty"`
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Body string `json:"body,omitempty"`
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}
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const (
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yamlFrontMatterFenceOpen, yamlFrontMatterFenceClose = "---", "---"
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tomlFrontMatterFenceOpen, tomlFrontMatterFenceClose = "+++", "+++"
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jsonFrontMatterFenceOpen, jsonFrontMatterFenceClose = "{", "}"
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)
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