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5288bd0c1c
- Fix error in `frontmatter.Parse` which would cause a `panic` when encountering malformed frontmatter - Add a unit-test to cover the above
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package frontmatter
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import (
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"fmt"
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"strings"
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"gopkg.in/yaml.v1"
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)
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// Frontmatter encapsulates cheatsheet frontmatter data
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type Frontmatter struct {
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Tags []string
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Syntax string
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}
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// Parse parses cheatsheet frontmatter
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func Parse(markdown string) (string, Frontmatter, error) {
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// specify the frontmatter delimiter
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delim := "---"
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// initialize a frontmatter struct
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var fm Frontmatter
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// if the markdown does not contain frontmatter, pass it through unmodified
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if !strings.HasPrefix(markdown, delim) {
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return strings.TrimSpace(markdown), fm, nil
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}
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// otherwise, split the frontmatter and cheatsheet text
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parts := strings.SplitN(markdown, delim, 3)
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// return an error if the frontmatter parses into the wrong number of parts
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if len(parts) != 3 {
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return markdown, fm, fmt.Errorf("failed to delimit frontmatter")
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}
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// return an error if the YAML cannot be unmarshalled
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if err := yaml.Unmarshal([]byte(parts[1]), &fm); err != nil {
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return markdown, fm, fmt.Errorf("failed to unmarshal frontmatter: %v", err)
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}
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return strings.TrimSpace(parts[2]), fm, nil
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}
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