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34 lines
1007 B
Go
34 lines
1007 B
Go
package pages
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import (
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"bytes"
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"regexp"
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"github.com/osteele/gojekyll/templates"
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yaml "gopkg.in/yaml.v2"
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)
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// ReadFrontMatter reads the front matter from a document.
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func ReadFrontMatter(sourcePtr *[]byte) (frontMatter templates.VariableMap, err error) {
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var (
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source = *sourcePtr
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start = 0
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)
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// Replace Windows linefeeds. This allows the following regular expressions to work.
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source = bytes.Replace(source, []byte("\r\n"), []byte("\n"), -1)
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if match := frontMatterMatcher.FindSubmatchIndex(source); match != nil {
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start = match[1]
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if err = yaml.Unmarshal(source[match[2]:match[3]], &frontMatter); err != nil {
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return
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}
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} else if match := emptyFontMatterMatcher.FindSubmatchIndex(source); match != nil {
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start = match[1]
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}
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// This fixes the line numbers, so that template errors show with the correct line.
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// TODO find a less hack-ey solution
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*sourcePtr = append(
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regexp.MustCompile(`[^\n\r]+`).ReplaceAllLiteral(source[:start], []byte{}),
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source[start:]...)
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return
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}
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