From 0f6b334b6715253b030c4e783b88e911b6e53e56 Mon Sep 17 00:00:00 2001
From: Sven Dowideit <SvenDowideit@home.org.au>
Date: Wed, 9 Sep 2015 10:03:38 +1000
Subject: Source file based relative linking

ala GitHub repository markdown for both md files and non-md files

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>
---
 helpers/content_renderer.go | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'helpers/content_renderer.go')

diff --git a/helpers/content_renderer.go b/helpers/content_renderer.go
index 00997900d..81386e03b 100644
--- a/helpers/content_renderer.go
+++ b/helpers/content_renderer.go
@@ -19,12 +19,18 @@ import (
 
 	"github.com/miekg/mmark"
 	"github.com/russross/blackfriday"
+	jww "github.com/spf13/jwalterweatherman"
 	"github.com/spf13/viper"
 )
 
+type LinkResolverFunc func(ref string) (string, error)
+type FileResolverFunc func(ref string) (string, error)
+
 // Wraps a blackfriday.Renderer, typically a blackfriday.Html
 // Enabling Hugo to customise the rendering experience
 type HugoHtmlRenderer struct {
+	FileResolver FileResolverFunc
+	LinkResolver LinkResolverFunc
 	blackfriday.Renderer
 }
 
@@ -38,6 +44,33 @@ func (renderer *HugoHtmlRenderer) BlockCode(out *bytes.Buffer, text []byte, lang
 	}
 }
 
+func (renderer *HugoHtmlRenderer) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
+	if renderer.LinkResolver == nil || bytes.HasPrefix(link, []byte("{@{@HUGOSHORTCODE")) {
+		// Use the blackfriday built in Link handler
+		renderer.Renderer.Link(out, link, title, content)
+	} else {
+		newLink, err := renderer.LinkResolver(string(link))
+		if err != nil {
+			newLink = string(link)
+			jww.ERROR.Printf("LinkResolver: %s", err)
+		}
+		renderer.Renderer.Link(out, []byte(newLink), title, content)
+	}
+}
+func (renderer *HugoHtmlRenderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) {
+	if renderer.FileResolver == nil || bytes.HasPrefix(link, []byte("{@{@HUGOSHORTCODE")) {
+		// Use the blackfriday built in Image handler
+		renderer.Renderer.Image(out, link, title, alt)
+	} else {
+		newLink, err := renderer.FileResolver(string(link))
+		if err != nil {
+			newLink = string(link)
+			jww.ERROR.Printf("FileResolver: %s", err)
+		}
+		renderer.Renderer.Image(out, []byte(newLink), title, alt)
+	}
+}
+
 // Wraps a mmark.Renderer, typically a mmark.html
 // Enabling Hugo to customise the rendering experience
 type HugoMmarkHtmlRenderer struct {
-- 
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