fix XML parsing (#2)

- Use antchfx/xmlquery for easier XML parsing. No more regexp wrangling and the result is much more reliable over a variety of ebooks. Much good.
- fix chapter selection, look for `<?xml[...]` which is much more reliable
- add option `-x` to dump the XML ebook source for debugging

cmd/config.go

@@ -16,7 +16,7 @@ import (
 )
 
 const (
-	Version string = `v0.0.2`
+	Version string = `v0.0.3`
 	Usage   string = `Usage epuppy [options] <epub file>
 
 Options:
@@ -25,6 +25,7 @@ Options:
 -n --line-numbers        add line numbers
 -c --config <file>       use config <file>
 -t --txt                 dump readable content to STDOUT
+-x --xml                 dump source xml to STDOUT
 -d --debug               enable debugging
 -h --help                show help message
 -v --version             show program version`
@@ -37,6 +38,7 @@ type Config struct {
 	Darkmode      bool         `koanf:"dark"`           // -D
 	LineNumbers   bool         `koanf:"line-numbers"`   // -n
 	Dump          bool         `koanf:"txt"`            // -t
+	XML           bool         `koanf:"xml"`            // -x
 	Config        string       `koanf:"config"`         // -c
 	ColorDark     ColorSetting `koanf:"colordark"`      // comes from config file only
 	ColorLight    ColorSetting `koanf:"colorlight"`     // comes from config file only
@@ -66,6 +68,7 @@ func InitConfig(output io.Writer) (*Config, error) {
 	flagset.BoolP("store-progress", "s", false, "store reading progress")
 	flagset.BoolP("line-numbers", "n", false, "add line numbers")
 	flagset.BoolP("txt", "t", false, "dump readable content to STDOUT")
+	flagset.BoolP("xml", "x", false, "dump xml to STDOUT")
 	flagset.StringP("config", "c", "", "read config from file")
 
 	if err := flagset.Parse(os.Args[1:]); err != nil {

cmd/view.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"path/filepath"
 	"strings"
@@ -33,17 +32,11 @@ func ViewText(conf *Config) (int, error) {
 }
 
 func ViewEpub(conf *Config) (int, error) {
-	book, err := epub.Open(conf.Document)
+	book, err := epub.Open(conf.Document, conf.XML)
 	if err != nil {
 		return 0, err
 	}
 
-	defer func() {
-		if err := book.Close(); err != nil {
-			log.Fatal(err)
-		}
-	}()
-
 	buf := strings.Builder{}
 	head := strings.Builder{}
 
@@ -59,9 +52,20 @@ func ViewEpub(conf *Config) (int, error) {
 		head.WriteString(" ")
 	}
 
-	// FIXME:  since the  switch to  book.Files() in  epub.Open() this
+	fetchByContent(conf, &buf, book)
-	// returns invalid chapter numbering
+
+	if conf.Dump {
+		return fmt.Println(buf.String())
+	}
+
+	return Pager(conf, head.String(), buf.String())
+}
+
+// FIXME:  since the  switch to  book.Files() in  epub.Open() this
+// returns invalid chapter numbering
+func fetchByContent(conf *Config, buf *strings.Builder, book *epub.Book) bool {
 	chapter := 1
+	var gotbody bool
 
 	for _, content := range book.Content {
 		if len(content.Body) > 0 {
@@ -81,13 +85,10 @@ func ViewEpub(conf *Config) (int, error) {
 
 			buf.WriteString("\r\n\r\n\r\n\r\n")
 			chapter++
+
+			gotbody = true
 		}
-
 	}
 
-	if conf.Dump {
+	return gotbody
-		return fmt.Println(buf.String())
-	}
-
-	return Pager(conf, head.String(), buf.String())
 }

go.mod

@@ -6,6 +6,7 @@ toolchain go1.24.9
 
 require (
 	github.com/alecthomas/repr v0.5.2
+	github.com/antchfx/xmlquery v1.5.0
 	github.com/knadh/koanf/parsers/toml v0.1.0
 	github.com/knadh/koanf/providers/file v1.2.0
 	github.com/knadh/koanf/providers/posflag v1.0.1
@@ -35,14 +36,17 @@ require (
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	golang.org/x/sys v0.37.0 // indirect
-	golang.org/x/text v0.3.8 // indirect
+	golang.org/x/text v0.30.0 // indirect
 )
 
 require (
+	github.com/antchfx/xpath v1.3.5 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/knadh/koanf/maps v0.1.2 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
+	golang.org/x/net v0.33.0 // indirect
 )

go.sum

@@ -1,5 +1,9 @@
 github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
 github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/antchfx/xmlquery v1.5.0 h1:uAi+mO40ZWfyU6mlUBxRVvL6uBNZ6LMU4M3+mQIBV4c=
+github.com/antchfx/xmlquery v1.5.0/go.mod h1:lJfWRXzYMK1ss32zm1GQV3gMIW/HFey3xDZmkP1SuNc=
+github.com/antchfx/xpath v1.3.5 h1:PqbXLC3TkfeZyakF5eeh3NTWEbYl4VHNVeufANzDbKQ=
+github.com/antchfx/xpath v1.3.5/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/aymanbagabas/go-udiff v0.2.0 h1:TK0fH4MteXUDspT88n8CKzvK0X9O2xu9yQjWpi6yML8=
@@ -28,6 +32,9 @@ github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S
 github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
 github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
 github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/knadh/koanf/maps v0.1.2 h1:RBfmAW5CnZT+PJ1CVc1QSJKf4Xu9kxfQgYVQSu8hpbo=
 github.com/knadh/koanf/maps v0.1.2/go.mod h1:npD/QZY3V6ghQDdcQzl1W4ICNVTkohC8E73eI2xW4yI=
 github.com/knadh/koanf/parsers/toml v0.1.0 h1:S2hLqS4TgWZYj4/7mI5m1CQQcWurxUz6ODgOub/6LCI=
@@ -73,15 +80,80 @@ github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKs
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
+golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
 golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
 golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
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 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
 golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
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 golang.org/x/term v0.36.0 h1:zMPR+aF8gfksFprF/Nc/rd1wRS1EI6nDBGyWAvDzx2Q=
 golang.org/x/term v0.36.0/go.mod h1:Qu394IJq6V6dCBRgwqshf3mPF85AqzYEzofzRdZkWss=
-golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/epub/book.go

@@ -16,8 +16,7 @@ type Book struct {
 	Container Container `json:"-"`
 	Mimetype  string    `json:"-"`
 	Content   []Content
-
+	fd        *zip.ReadCloser
-	fd *zip.ReadCloser
 }
 
 // Open open resource file
@@ -34,11 +33,6 @@ func (p *Book) Files() []string {
 	return fns
 }
 
-// Close close file reader
-func (p *Book) Close() error {
-	return p.fd.Close()
-}
-
 // -----------------------------------------------------------------------------
 func (p *Book) filename(n string) string {
 	return path.Join(path.Dir(p.Container.Rootfile.Path), n)

pkg/epub/content.go

@@ -1,19 +1,16 @@
 package epub
 
 import (
-	"encoding/xml"
-	"fmt"
 	"regexp"
 	"strings"
+
+	"github.com/antchfx/xmlquery"
 )
 
 var (
-	cleantitle    = regexp.MustCompile(`(?s)<head>.*</head>`)
+	cleanentitles = regexp.MustCompile(`&.+;`)
-	cleanmarkup   = regexp.MustCompile(`<[^<>]+>`)
+	empty         = regexp.MustCompile(`(?s)^[\s ]*$`)
-	cleanentities = regexp.MustCompile(`&.+;`)
+	newlines      = regexp.MustCompile(`[\r\n]+`)
-	cleancomments = regexp.MustCompile(`/*.*/`)
-	cleanspace    = regexp.MustCompile(`^\s*`)
-	cleanh1       = regexp.MustCompile(`<h[1-6].*</h[1-6]>`)
 )
 
 // Content nav-point content
@@ -26,25 +23,30 @@ type Content struct {
 }
 
 func (c *Content) String(content []byte) error {
-	title := Title{}
+	// parse XML, look for title and <p>.*</p> stuff
-
+	doc, err := xmlquery.Parse(
-	err := xml.Unmarshal(content, &title)
+		strings.NewReader(
+			cleanentitles.ReplaceAllString(string(content), " ")))
 	if err != nil {
-		if !strings.HasPrefix(err.Error(), "XML syntax error") {
+		panic(err)
-			return fmt.Errorf("XML parser error %w", err)
+	}
+
+	// extract the title
+	for _, item := range xmlquery.Find(doc, "//title") {
+		c.Title = strings.TrimSpace(item.InnerText())
+	}
+
+	// extract all  paragraphs, ignore any formatting  and re-fill the
+	// paragraph,  that is, we  replaces all newlines inside  with one
+	// space.
+	txt := strings.Builder{}
+	for _, item := range xmlquery.Find(doc, "//p") {
+		if !empty.MatchString(item.InnerText()) {
+			txt.WriteString(newlines.ReplaceAllString(item.InnerText(), " ") + "\n\n")
 		}
 	}
 
-	c.Title = strings.TrimSpace(title.Content)
+	c.Body = strings.TrimSpace(txt.String())
-
-	txt := cleantitle.ReplaceAllString(string(content), "")
-	txt = cleanh1.ReplaceAllString(txt, "")
-	txt = cleanmarkup.ReplaceAllString(txt, "")
-	txt = cleanentities.ReplaceAllString(txt, " ")
-	txt = cleancomments.ReplaceAllString(txt, "")
-	txt = strings.TrimSpace(txt)
-
-	c.Body = cleanspace.ReplaceAllString(txt, "")
 	c.XML = content
 
 	if len(c.Body) == 0 {

pkg/epub/epub_test.go

@@ -1,36 +1,22 @@
 package epub
 
 import (
-	"log"
 	"testing"
 )
 
 func TestEpub(t *testing.T) {
-	bk, err := open(t, "test.epub")
+	_, err := open(t, "test.epub")
 	if err != nil {
 		t.Fatal(err)
 	}
-
-	defer func() {
-		if err := bk.Close(); err != nil {
-			log.Fatal(err)
-		}
-	}()
-
 }
 
 func open(t *testing.T, f string) (*Book, error) {
-	bk, err := Open(f)
+	bk, err := Open(f, false)
 	if err != nil {
 		return nil, err
 	}
 
-	defer func() {
-		if err := bk.Close(); err != nil {
-			log.Fatal(err)
-		}
-	}()
-
 	t.Logf("files: %+v", bk.Files())
 	t.Logf("book: %+v", bk)
 

pkg/epub/ncx.go

@@ -7,8 +7,9 @@ type Ncx struct {
 
 // NavPoint nav point
 type NavPoint struct {
-	Text   string     `xml:"navLabel>text" json:"text"`
+	Text    string     `xml:"navLabel>text" json:"text"`
-	Points []NavPoint `xml:"navPoint" json:"points"`
+	Content Content    `xml:"content" json:"content"`
+	Points  []NavPoint `xml:"navPoint" json:"points"`
 }
 
 type Title struct {

pkg/epub/open.go

@@ -2,12 +2,14 @@ package epub
 
 import (
 	"archive/zip"
+	"fmt"
 	"log"
+	"os"
 	"strings"
 )
 
 // Open open a epub file
-func Open(fn string) (*Book, error) {
+func Open(fn string, dumpxml bool) (*Book, error) {
 	fd, err := zip.OpenReader(fn)
 	if err != nil {
 		return nil, err
@@ -55,14 +57,21 @@ func Open(fn string) (*Book, error) {
 		}
 
 		ct := Content{Src: file}
-
+		if strings.Contains(string(content), "<?xml") {
-		if strings.Contains(string(content), "DOCTYPE") {
 			if err := ct.String(content); err != nil {
 				return &bk, err
 			}
 		}
 
 		bk.Content = append(bk.Content, ct)
+
+		if dumpxml {
+			fmt.Println(string(ct.XML))
+		}
+	}
+
+	if dumpxml {
+		os.Exit(0)
 	}
 
 	return &bk, nil