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package post
import (
"fmt"
"io"
"text/template"
)
// PreprocessFunctions are functions which can be used by posts themselves to
// interleave dynamic content into their bodies. Usually this is used for
// properly constructing URLs, but also for things like displaying images.
type PreprocessFunctions struct {
// BlogURL returns the given string, rooted to the blog's base url (which
// may or may not include path components itself).
//
// The given path should not have a leading slash.
BlogURL func(path string) string
// AssetURL returns the URL of the asset with the given ID.
AssetURL func(id string) string
// PostURL returns the URL of the post with the given ID.
PostURL func(id string) string
// StaticURL returns the URL of a file being served from the static
// directory. The given path should _not_ include the prefixed 'static/'
// path element.
StaticURL func(path string) string
// Image returns a string which should be inlined into the post body in
// order to display an.
//
// The first argument to Image _must_ be the ID of an image asset. The
// second argument _may_ be a description of the image which will be used as
// alt text, or possibly displayed to the user with the image.
Image func(args ...string) (string, error)
}
// PreprocessBody interprets the Post's Body as a text template which may use
// any of the functions found in PreprocessFunctions (all must be set). It
// executes the template and writes the result to the given writer.
func (p Post) PreprocessBody(into io.Writer, funcs PreprocessFunctions) error {
tpl := template.New("")
tpl.Funcs(template.FuncMap{
"BlogURL": funcs.BlogURL,
"AssetURL": funcs.AssetURL,
"PostURL": funcs.PostURL,
"StaticURL": funcs.StaticURL,
"Image": funcs.Image,
})
tpl, err := tpl.Parse(p.Body)
if err != nil {
return fmt.Errorf("parsing post body as template: %w", err)
}
if err := tpl.Execute(into, nil); err != nil {
return fmt.Errorf("executing post body as template: %w", err)
}
return nil
}
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