Add dump feature, enhance code quality (#1)

pkg/epub/book.go

@@ -5,6 +5,7 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
+	"log"
 	"path"
 )
 
@@ -34,8 +35,8 @@ func (p *Book) Files() []string {
 }
 
 // Close close file reader
-func (p *Book) Close() {
-	p.fd.Close()
+func (p *Book) Close() error {
+	return p.fd.Close()
 }
 
 // -----------------------------------------------------------------------------
@@ -48,7 +49,13 @@ func (p *Book) readXML(n string, v interface{}) error {
 	if err != nil {
 		return nil
 	}
-	defer fd.Close()
+
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
 	dec := xml.NewDecoder(fd)
 
 	if err := dec.Decode(v); err != nil {
@@ -63,7 +70,11 @@ func (p *Book) readBytes(n string) ([]byte, error) {
 	if err != nil {
 		return nil, nil
 	}
-	defer fd.Close()
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
 
 	data, err := io.ReadAll(fd)
 	if err != nil {

pkg/epub/content.go

@@ -42,7 +42,6 @@ func (c *Content) String(content []byte) error {
 	txt = cleanmarkup.ReplaceAllString(txt, "")
 	txt = cleanentities.ReplaceAllString(txt, " ")
 	txt = cleancomments.ReplaceAllString(txt, "")
-
 	txt = strings.TrimSpace(txt)
 
 	c.Body = cleanspace.ReplaceAllString(txt, "")

pkg/epub/epub_test.go

@@ -1,6 +1,7 @@
 package epub
 
 import (
+	"log"
 	"testing"
 )
 
@@ -9,7 +10,13 @@ func TestEpub(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer bk.Close()
+
+	defer func() {
+		if err := bk.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
 }
 
 func open(t *testing.T, f string) (*Book, error) {
@@ -17,7 +24,12 @@ func open(t *testing.T, f string) (*Book, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer bk.Close()
+
+	defer func() {
+		if err := bk.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
 
 	t.Logf("files: %+v", bk.Files())
 	t.Logf("book: %+v", bk)

pkg/epub/open.go

@@ -2,6 +2,7 @@ package epub
 
 import (
 	"archive/zip"
+	"log"
 	"strings"
 )
 
@@ -12,7 +13,11 @@ func Open(fn string) (*Book, error) {
 		return nil, err
 	}
 
-	defer fd.Close()
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
 
 	bk := Book{fd: fd}
 	mt, err := bk.readBytes("mimetype")