mirror of https://github.com/cheat/cheat.git
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package sheet
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import (
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"fmt"
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"runtime"
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"strings"
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"gopkg.in/yaml.v2"
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)
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// Parse parses cheatsheet frontmatter
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func parse(markdown string) (frontmatter, string, error) {
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// determine the appropriate line-break for the platform
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linebreak := "\n"
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if runtime.GOOS == "windows" {
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linebreak = "\r\n"
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}
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// specify the frontmatter delimiter
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delim := fmt.Sprintf("---%s", linebreak)
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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 fm, markdown, 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 fm, markdown, 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 fm, markdown, fmt.Errorf("failed to unmarshal frontmatter: %v", err)
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}
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return fm, parts[2], nil
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}
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