From 29bfce969abc90a507dbdd6716304a509a0e4da9 Mon Sep 17 00:00:00 2001
From: gonejack <igonejack@gmail.com>
Date: Sat, 10 Apr 2021 09:45:29 +0800
Subject: [PATCH] Fix missing thumbnail on MacOS

---
 epub.go |  4 +++-
 pkg.go  | 17 ++++++++++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/epub.go b/epub.go
index 2211feb..b6fc217 100644
--- a/epub.go
+++ b/epub.go
@@ -32,6 +32,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 
@@ -309,6 +310,7 @@ func (e *Epub) SetCover(internalImagePath string, internalCSSPath string) {
 	}
 
 	e.cover.imageFilename = filepath.Base(internalImagePath)
+	e.pkg.setCover(e.cover.imageFilename)
 
 	// Use default cover stylesheet if one isn't provided
 	if internalCSSPath == "" {
@@ -436,7 +438,7 @@ func addMedia(source string, internalFilename string, mediaFileFormat string, me
 
 	mediaMap[internalFilename] = source
 
-	return filepath.Join(
+	return path.Join(
 		"..",
 		mediaFolderName,
 		internalFilename,
diff --git a/pkg.go b/pkg.go
index 6bfeb17..345134b 100644
--- a/pkg.go
+++ b/pkg.go
@@ -44,6 +44,7 @@ const (
 type pkg struct {
 	xml          *pkgRoot
 	authorMeta   *pkgMeta
+	coverMeta    *pkgMeta
 	modifiedMeta *pkgMeta
 }
 
@@ -98,6 +99,8 @@ type pkgMeta struct {
 	Scheme   string `xml:"scheme,attr,omitempty"`
 	ID       string `xml:"id,attr,omitempty"`
 	Data     string `xml:",chardata"`
+	Name     string `xml:"name,attr,omitempty"`
+	Content  string `xml:"content,attr,omitempty"`
 }
 
 // The <metadata> element
@@ -107,10 +110,10 @@ type pkgMetadata struct {
 	// Ex: <dc:title>Your title here</dc:title>
 	Title string `xml:"dc:title"`
 	// Ex: <dc:language>en</dc:language>
-	Language string `xml:"dc:language"`
+	Language    string `xml:"dc:language"`
 	Description string `xml:"dc:description,omitempty"`
-	Creator  *pkgCreator
-	Meta     []pkgMeta `xml:"meta"`
+	Creator     *pkgCreator
+	Meta        []pkgMeta `xml:"meta"`
 }
 
 // The <spine> element
@@ -182,6 +185,14 @@ func (p *pkg) setAuthor(author string) {
 	p.xml.Metadata.Meta = updateMeta(p.xml.Metadata.Meta, p.authorMeta)
 }
 
+func (p *pkg) setCover(coverRef string) {
+	p.coverMeta = &pkgMeta{
+		Name:    "cover",
+		Content: coverRef,
+	}
+	p.xml.Metadata.Meta = updateMeta(p.xml.Metadata.Meta, p.coverMeta)
+}
+
 func (p *pkg) setIdentifier(identifier string) {
 	p.xml.Metadata.Identifier.Data = identifier
 }