mirror of
https://github.com/danog/gojekyll.git
synced 2024-11-30 08:48:59 +01:00
114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
package main
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import (
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"fmt"
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"path"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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. "github.com/osteele/gojekyll/helpers"
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)
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// PermalinkStyles defines built-in styles from https://jekyllrb.com/docs/permalinks/#builtinpermalinkstyles
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var PermalinkStyles = map[string]string{
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"date": "/:categories/:year/:month/:day/:title.html",
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"pretty": "/:categories/:year/:month/:day/:title/",
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"ordinal": "/:categories/:year/:y_day/:title.html",
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"none": "/:categories/:title.html",
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}
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// permalinkDateVariables maps Jekyll permalink template variable names
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// to time.Format layout strings
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var permalinkDateVariables = map[string]string{
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"month": "01",
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"imonth": "1",
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"day": "02",
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"i_day": "2",
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"hour": "15",
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"minute": "04",
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"second": "05",
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"year": "2006",
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"short_year": "06",
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}
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var templateVariableMatcher = regexp.MustCompile(`:\w+\b`)
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// See https://jekyllrb.com/docs/permalinks/#template-variables
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func (p *pageFields) permalinkTemplateVariables() map[string]string {
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var (
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collectionName string
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path = p.relpath
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ext = filepath.Ext(path)
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outputExt = ext
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root = PathWithoutExtension(path)
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name = filepath.Base(root)
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title = p.frontMatter.String("title", name)
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)
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switch {
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case p.site.IsMarkdown(path):
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outputExt = ".html"
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case p.site.IsSassPath(path):
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outputExt = ".css"
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}
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if val, found := p.frontMatter["collection"]; found {
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collectionName = val.(string)
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prefix := "_" + collectionName + "/"
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if !strings.HasPrefix(path, prefix) {
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panic(fmt.Errorf("Expected %s to start with %s", path, prefix))
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}
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root = root[len(prefix):]
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}
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vs := map[string]string{
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"collection": collectionName,
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"name": Slugify(name),
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"path": "/" + root,
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"title": title,
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"slug": Slugify(name),
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// TODO categories
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// The following isn't documented, but is evident
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"output_ext": outputExt,
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}
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d := time.Now() // TODO read from frontMatter or use file modtime
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for name, f := range permalinkDateVariables {
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vs[name] = d.Format(f)
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}
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return vs
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}
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func (p *pageFields) expandPermalink() (s string, err error) {
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pattern := p.frontMatter.String("permalink", ":path:output_ext")
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if p, found := PermalinkStyles[pattern]; found {
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pattern = p
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}
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templateVariables := p.permalinkTemplateVariables()
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// The ReplaceAllStringFunc callback signals errors via panic.
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// Turn them into return values.
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defer func() {
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if r := recover(); r != nil {
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if e, ok := r.(error); ok {
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err = e
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} else {
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panic(r)
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}
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}
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}()
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s = templateVariableMatcher.ReplaceAllStringFunc(pattern, func(m string) string {
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varname := m[1:]
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value, found := templateVariables[varname]
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if !found {
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panic(fmt.Errorf("unknown variable %s in permalink template %s", varname, pattern))
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}
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return value
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})
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return path.Clean(s), nil
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}
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// The permalink is computed once instead of on demand, so that subsequent
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// access needn't check for an error.
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func (p *pageFields) initPermalink() (err error) {
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p.permalink, err = p.expandPermalink()
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return
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}
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