Fix crash and add support for content in <div> (#9)

* fix #8: better regex to remove html entities
* add opf and ncx debug
* make epub content retrieval more flexible
* fix epub content retrieval: also support html files with <div>

.github/workflows/ci.yaml

@@ -21,9 +21,29 @@ jobs:
     - name: build
       run: go build
 
+  test:
+    strategy:
+      matrix:
+        version: [1.24.9]
+        os: [ubuntu-latest]
+    name: Test
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Set up Go ${{ matrix.os }}
+      uses: actions/setup-go@v6
+      with:
+        go-version: '${{ matrix.version }}'
+      id: go
+
+    - name: checkout
+      uses: actions/checkout@v5
+
+    - name: test
+      run: go test -cover ./...
+      
 
   golangci:
-    name: lint
+    name: Lintercheck
     runs-on: ubuntu-latest
     steps:
       - uses: actions/setup-go@v6

CODE_OF_CONDUCT.md

@@ -0,0 +1,18 @@
+# CODE_OF_CONDUCT.md (compact model)
+
+Purpose: Maintain a collaborative, harassment-free environment focused
+on shipping quality software.
+
+Standards:  Be  respectful;  assume  good intent;  no  harassment;  no
+discrimination; keep critiques technical.
+
+Scope: All project spaces (issues, PRs, forums, events).
+
+Reporting: Email tom AT vondein DOT org. Acknowledge within 72 hours.
+
+Enforcement:    Two    maintainers     review,    one    recuses    on
+conflict. Sanctions range from warning  to removal. Summary posted (no
+personal details).
+
+Escalation: If you believe maintainers  handled a report in bad faith,
+escalate to our foundation committee (link) for independent review.

CONTRIBUTING.md

@@ -0,0 +1,94 @@
+## Project Goals
+
+The idea behind this  project is to build a small TUI  tool to be able
+to just take a look into some  epub file without the need to leave the
+shell. It has to be fast enough  to just peak into an ebook and should
+be small and easy to understand.
+
+There will be no GUI, no web interface, no public API of some sort, no
+builtin interpreter.  It is not intended  to build a full  blown ebook
+reader.
+
+The  programming  language  used  for  this  project  will  always  be
+[GOLANG](https://go.dev/)  with  the  exception of  the  documentation
+([Perl POD](https://perldoc.perl.org/perlpod)) and the Makefile.
+
+# Contributing
+
+You can contribute to this project in various ways:
+
+## Open an issue
+
+If you encounter  a problem or don't understand how  the program works
+or if you think the documentation is unclear, please don't hesitate to
+open an issue.
+
+Please add as much information about the case as possible, such as:
+
+- Your environment (operating system etc)
+- program version
+- Input data. Please replace sensitive information with mock data!
+- Actual program output.
+- Expected program output.
+- Error message - if any.
+
+Be aware  that I  am working on  this (and some  other) project  in my
+spare  time which  is scarce.   Therefore  please don't  expect me  to
+respond to  your query within  hours or even  days. Be patient,  but I
+WILL respond.
+
+## Pull Requests
+
+Code and documentation help is  always much appreciated! Please follow
+thes guidelines to successfully contribute:
+
+-  Every  pull   request  shall  be  based   on  latest  `development`
+  branch. `main` is only used for releases.
+  
+- Execute the  unit tests before committing: `make  test`. There shall
+  be no errors.
+  
+- Strive  to be  backwards compatible  so that  users who  are already
+  using the program  don't have to change their habits  - unless it is
+  really neccessary.
+
+- Try to add a unit test for your addition.
+
+- Don't ever change existing unit tests!
+
+- Add a meaningful and comprehensive rationale about your contribution:
+  - Why do you think it might be useful for others?
+  - What did you actually change or add?
+  - Is there an open issue which  this PR fixes and if so, please link
+    to that issue.
+
+- [Re-]format your code with `gofmt -s`.
+
+- Avoid unneccesary dependencies, especially for very small functions.
+
+- **If** a  new dependency is being added, it  must be compatible with
+  our [license agreement](LICENSE).
+  
+- You  need to accept  that the  code or documentation  you contribute
+  will be redistributed under the  terms of said license agreement. If
+  your  contribution  is  considerably  large  or  if  you  contribute
+  regularly, then  feel free  to add  your name and  if you  want your
+  email    address     to    the    *AUTHORS*    section     of    the
+  manual page.
+
+- Adhere to the above mentioned project goals.
+
+-  If  you are  unsure if  your addition or  change will  be accepted,
+  better ask before starting coding. Open an issue about your proposal
+  and let's  discuss it! That way  we avoid doing unnessesary  work on
+  both sides.
+    
+Each pull  request will be  carefully reviewed and  if it is  a useful
+addition  it  will  be  accepted. However,  please  be  prepared  that
+sometimes a  PR will be  rejected.  The reasons  may vary and  will be
+documented.   Perhaps the  above guidelines  are not  matched, or  the
+addition seems  to be not so  useful from my perspective,  maybe there
+are  too  much  changes  or  there  might  be  changes  I  don't  even
+understand.
+
+But whatever happens: your contribution is always welcome!

README.md

@@ -1,3 +1,8 @@
+[![Actions](https://github.com/tlinden/epuppy/actions/workflows/ci.yaml/badge.svg)](https://github.com/tlinden/epuppy/actions)
+[![License](https://img.shields.io/badge/license-GPL-blue.svg)](https://github.com/tlinden/epuppy/blob/master/LICENSE)
+[![Go Report Card](https://goreportcard.com/badge/github.com/tlinden/epuppy)](https://goreportcard.com/report/github.com/tlinden/epuppy)
+
+
 # epuppy - terminal epub reader
 
 This is a little TUI epub ebook reader. This is a work in progress and
@@ -6,6 +11,13 @@ may not work for all EPUB files yet. It uses a modified version of the
 unmaintained but the best I could find to parse EPUBs. Find it in the
 `pkg/epub/` directory.
 
+The idea behind this tool is to be able to just take a look into some
+epub file without the need to leave the shell. And it had to be fast
+enough to just peak into an ebook. However, it is possible to actually
+read epub ebooks with epuppy but I'd encourage you to buy a hardware
+ebook reader with an e-ink display. It's better for your eyes in the
+long run.
+
 ## Screenshots
 
 - Viewing an ebook in dark mode
@@ -20,6 +32,66 @@ unmaintained but the best I could find to parse EPUBs. Find it in the
 - Showing the help
 ![Screenshot](https://github.com/TLINDEN/epuppy/blob/main/.github/assets/help.png)
 
+## Usage
+
+To read an ebook, just give a filename as argument to `epuppy`.
+
+Add  the option  `-s` to  store and  use a  previously stored  reading
+progress.
+
+Sometimes you may be unhappy with the colors. Depending on your
+terminal style you can enable dark mode with `-D`, light mode is the
+default. You can also configure custom colors in a config file in
+`$HOME/.config/epuppy/confit.toml`:
+
+```toml
+# color setting for dark mode
+colordark = {
+  body = "#ffffff",
+  title = "#7cfc00",
+  chapter = "#ffff00"
+}
+
+# color setting for light mode
+colorlight = {
+  body = "#000000",
+  title = "#8470ff",
+  chapter = "#00008b"
+}
+
+# always use dark mode
+dark = true
+```
+
+There are also cases where your current terminal just doesn't have the
+capabilites for this stuff. I stumbled upon such a case during an SSH
+session from my Android phone to a FreeBSD server. For this you can
+either just disable colors with `-N` or by setting the environment
+variable `$NO_COLOR` to 1. Or you can just dump the text of the ebook
+and pipe it to some pager, e.g.:
+
+```default
+epuppy -t someebook.epub | less
+```
+
+There are also a couple of debug options etc, all options:
+
+```default
+Usage epuppy [options] <epub file>
+
+Options:
+-D --dark                enable dark mode
+-s --store-progress      remember reading position
+-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
+-N --no-color            disable colors (or use $NO_COLOR env var)
+-d --debug               enable debugging
+-h --help                show help message
+-v --version             show program version
+```
+
 ## Installation
 
 The tool does not have any dependencies.  Just download the binary for
@@ -76,4 +148,4 @@ version 3.
 
 # Author
 
-Copyleft (c) 2024 Thomas von Dein
+Copyleft (c) 2025 Thomas von Dein

cmd/colors.go

@@ -1,3 +1,19 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package cmd
 
 import (

cmd/config.go

@@ -1,3 +1,19 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package cmd
 
 import (
@@ -16,31 +32,40 @@ import (
 )
 
 const (
-	Version string = `v0.0.2`
+	Version string = `v0.0.5`
-	Usage   string = `Usage epuppy [options] <epub file>
+	Usage   string = `This is epuppy, a terminal ui ebook viewer.
+
+Usage: epuppy [options] <epub file>
 
 Options:
 -D --dark                enable dark mode
--s --store-progress      store and use previous (experimental)
+-s --store-progress      remember reading position
 -n --line-numbers        add line numbers
 -c --config <file>       use config <file>
+-i --cover-image         display cover image
+-t --txt                 dump readable content to STDOUT
+-x --xml                 dump source xml to STDOUT
+-N --no-color            disable colors (or use $NO_COLOR env var)
 -d --debug               enable debugging
 -h --help                show help message
--v --version             show program version
+-v --version             show program version`
-`
 )
 
 type Config struct {
-	Showversion   bool         `koanf:"version"`        // -v
+	Showversion     bool         `koanf:"version"`        // -v
-	Debug         bool         `koanf:"debug"`          // -d
+	Debug           bool         `koanf:"debug"`          // -d
-	StoreProgress bool         `koanf:"store-progress"` // -s
+	StoreProgress   bool         `koanf:"store-progress"` // -s
-	Darkmode      bool         `koanf:"dark"`           // -D
+	Darkmode        bool         `koanf:"dark"`           // -D
-	LineNumbers   bool         `koanf:"line-numbers"`   // -n
+	LineNumbers     bool         `koanf:"line-numbers"`   // -n
-	Config        string       `koanf:"config"`         // -c
+	Dump            bool         `koanf:"txt"`            // -t
-	ColorDark     ColorSetting `koanf:"colordark"`      // comes from config file only
+	XML             bool         `koanf:"xml"`            // -x
-	ColorLight    ColorSetting `koanf:"colorlight"`     // comes from config file only
+	NoColor         bool         `koanf:"no-color"`       // -n
-
+	Config          string       `koanf:"config"`         // -c
-	Colors          Colors // generated from user config file or internal defaults, respects dark mode
+	ColorDark       ColorSetting `koanf:"colordark"`      // comes from config file only
+	ColorLight      ColorSetting `koanf:"colorlight"`     // comes from config file only
+	ShowHelp        bool         `koanf:"help"`
+	ShowCover       bool         `koanf:"cover-image"` // -i
+	Colors          Colors       // generated from user config file or internal defaults, respects dark mode
 	Document        string
 	InitialProgress int // lines
 }
@@ -55,7 +80,6 @@ func InitConfig(output io.Writer) (*Config, error) {
 		if err != nil {
 			log.Fatalf("failed to print to output: %s", err)
 		}
-		os.Exit(0)
 	}
 
 	// parse commandline flags
@@ -64,6 +88,11 @@ func InitConfig(output io.Writer) (*Config, error) {
 	flagset.BoolP("dark", "D", false, "enable dark mode")
 	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.BoolP("no-color", "N", false, "disable colors")
+	flagset.BoolP("cover-image", "i", false, "show cover image")
+	flagset.BoolP("help", "h", false, "show help")
 	flagset.StringP("config", "c", "", "read config from file")
 
 	if err := flagset.Parse(os.Args[1:]); err != nil {
@@ -112,8 +141,10 @@ func InitConfig(output io.Writer) (*Config, error) {
 	if len(flagset.Args()) > 0 {
 		conf.Document = flagset.Args()[0]
 	} else {
-		flagset.Usage()
+		if !conf.Showversion && !conf.ShowHelp {
-		os.Exit(1)
+			flagset.Usage()
+			os.Exit(1)
+		}
 	}
 
 	if conf.Debug {
@@ -134,6 +165,11 @@ func InitConfig(output io.Writer) (*Config, error) {
 		},
 		conf)
 
+	// disable colors if requested by command line
+	if conf.NoColor {
+		_ = os.Setenv("NO_COLOR", "1")
+	}
+
 	return conf, nil
 }
 

cmd/pager.go

@@ -1,3 +1,19 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package cmd
 
 // pager setup using bubbletea
@@ -5,10 +21,13 @@ package cmd
 // https://github.com/charmbracelet/bubbletea/tree/main/examples/pager
 
 import (
+	"bytes"
 	"fmt"
+	"image"
 	"os"
 	"strings"
 
+	"github.com/blacktop/go-termimg"
 	"github.com/charmbracelet/bubbles/help"
 	"github.com/charmbracelet/bubbles/key"
 	"github.com/charmbracelet/bubbles/viewport"
@@ -43,22 +62,25 @@ type Meta struct {
 	lines           int
 	currentline     int
 	initialprogress int
-	document        string
 }
 
 type keyMap struct {
-	Up    key.Binding
+	Up       key.Binding
-	Down  key.Binding
+	Down     key.Binding
-	Left  key.Binding
+	Left     key.Binding
-	Right key.Binding
+	Right    key.Binding
-	Help  key.Binding
+	Help     key.Binding
-	Quit  key.Binding
+	Quit     key.Binding
+	ToggleUI key.Binding
+	Pad      key.Binding
 }
 
 func (k keyMap) FullHelp() [][]key.Binding {
 	return [][]key.Binding{
-		{k.Up, k.Down, k.Left, k.Right}, // first column
+		// every item is one column
-		{k.Help, k.Quit},                // second column
+		{k.Up, k.Down, k.Left, k.Right},
+		{k.Pad}, // fake key, we use it as spacing between columns
+		{k.Help, k.Quit, k.ToggleUI},
 	}
 }
 
@@ -67,6 +89,10 @@ func (k keyMap) ShortHelp() []key.Binding {
 }
 
 var keys = keyMap{
+	Pad: key.NewBinding(
+		key.WithKeys("__"),
+		key.WithHelp("  ", ""),
+	),
 	Up: key.NewBinding(
 		key.WithKeys("up", "k"),
 		key.WithHelp("↑", "move up"),
@@ -76,11 +102,11 @@ var keys = keyMap{
 		key.WithHelp("↓", "move down"),
 	),
 	Left: key.NewBinding(
-		key.WithKeys("left", "h"),
+		key.WithKeys("left"),
 		key.WithHelp("←", "decrease text width"),
 	),
 	Right: key.NewBinding(
-		key.WithKeys("right", "l"),
+		key.WithKeys("right"),
 		key.WithHelp("→", "increase text width"),
 	),
 	Help: key.NewBinding(
@@ -91,6 +117,10 @@ var keys = keyMap{
 		key.WithKeys("q", "esc", "ctrl+c"),
 		key.WithHelp("q", "quit"),
 	),
+	ToggleUI: key.NewBinding(
+		key.WithKeys("h"),
+		key.WithHelp("h", "toggle ui"),
+	),
 }
 
 type Doc struct {
@@ -102,8 +132,10 @@ type Doc struct {
 	lastwidth    int
 	margin       int
 	marginMod    bool
+	hideUi       bool
 	meta         *Meta
 	config       *Config
+	Cover        *termimg.ImageWidget
 
 	keys keyMap
 	help help.Model
@@ -136,6 +168,8 @@ func (m Doc) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				m.margin -= MarginStep
 				m.marginMod = true
 			}
+		case key.Matches(msg, m.keys.ToggleUI):
+			m.hideUi = !m.hideUi
 		}
 
 	case tea.WindowSizeMsg:
@@ -152,9 +186,7 @@ func (m Doc) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.viewport = viewport.New(msg.Width, msg.Height-verticalMarginHeight)
 			m.viewport.YPosition = headerHeight
 
-			m.viewport.SetContent(wordwrap.String(m.content, m.initialwidth))
+			m.Rewrap()
-			m.viewport.ScrollDown(m.meta.initialprogress)
-
 			m.ready = true
 		} else {
 			m.viewport.Width = msg.Width
@@ -171,15 +203,40 @@ func (m Doc) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, tea.Batch(cmds...)
 }
 
-// re-calculate word wrapping, also add left margin
+// re-calculate word wrapping, add left margin, recalculate line count
 func (m *Doc) Rewrap() {
+	var content string
+
+	// width has changed, either  because the terminal size changed or
+	// because the user added some margin
 	if m.lastwidth != m.viewport.Width || m.marginMod {
-		m.viewport.SetContent(wordwrap.String(m.content, m.viewport.Width-(m.margin*2)))
+		content = wordwrap.String(m.content, m.viewport.Width-(m.margin*2))
 		m.lastwidth = m.viewport.Width
 		m.marginMod = false
 
 		m.viewport.Style = viewstyle.MarginLeft(m.margin)
 	}
+
+	// bootstrapping, initialize with default width
+	if !m.ready {
+		content = wordwrap.String(m.content, m.initialwidth)
+	}
+
+	// wrapping has changed, update viewport and line count
+	if content != "" {
+		if m.Cover != nil {
+			cover, _ := m.Cover.Render()
+			m.viewport.SetContent(cover + "\n\n" + content)
+		} else {
+			m.viewport.SetContent(content)
+		}
+		m.meta.lines = len(strings.Split(content, "\n"))
+	}
+
+	// during bootstrapping: jump to last remembered position, if any
+	if !m.ready {
+		m.viewport.ScrollDown(m.meta.initialprogress)
+	}
 }
 
 func (m Doc) View() string {
@@ -188,14 +245,17 @@ func (m Doc) View() string {
 	}
 
 	// update current line for later saving
-	// FIXME: doesn't work correctly yet
+	m.meta.currentline = int(float64(m.meta.lines) * m.viewport.ScrollPercent())
-	m.meta.currentline = int(float64(m.viewport.TotalLineCount()) * m.viewport.ScrollPercent())
 
 	var helpView string
 	if m.help.ShowAll {
 		helpView = "\n" + m.help.View(m.keys)
 	}
 
+	if m.hideUi {
+		return fmt.Sprintf("%s\n%s", m.viewport.View(), helpView)
+	}
+
 	return fmt.Sprintf("%s\n%s\n%s%s", m.headerView(), m.viewport.View(), m.footerView(), helpView)
 }
 
@@ -219,7 +279,15 @@ func max(a, b int) int {
 	return b
 }
 
-func Pager(conf *Config, title, message string) (int, error) {
+type Ebook struct {
+	Config    *Config
+	Title     string
+	Body      string
+	Cover     []byte
+	MediaType string
+}
+
+func Pager(book *Ebook) (int, error) {
 	width := 80
 	scrollto := 0
 
@@ -230,41 +298,53 @@ func Pager(conf *Config, title, message string) (int, error) {
 		}
 	}
 
-	if conf.StoreProgress {
+	if book.Config.StoreProgress {
-		scrollto = conf.InitialProgress
+		scrollto = book.Config.InitialProgress
 	}
 
-	if conf.LineNumbers {
+	if book.Config.LineNumbers {
 		catn := ""
-		for idx, line := range strings.Split(message, "\n") {
+		for idx, line := range strings.Split(book.Body, "\n") {
-			catn += fmt.Sprintf("%d: %s\n", idx, line)
+			catn += fmt.Sprintf("%4d: %s\n", idx, line)
 		}
-		message = catn
+		book.Body = catn
 	}
 
 	meta := Meta{
 		initialprogress: scrollto,
-		lines:           len(strings.Split(message, "\n")),
+		lines:           len(strings.Split(book.Body, "\n")),
+	}
+
+	doc := Doc{
+		content:      book.Body,
+		title:        book.Title,
+		initialwidth: width,
+		meta:         &meta,
+		config:       book.Config,
+		keys:         keys,
+	}
+
+	if book.MediaType != "" && book.Config.ShowCover {
+		img, _, err := image.Decode(bytes.NewReader(book.Cover))
+		if err != nil {
+			return 0, fmt.Errorf("failed to load cover image: %w", err)
+		}
+
+		doc.Cover = termimg.NewImageWidgetFromImage(img)
+		doc.Cover.SetSize(width, width).SetProtocol(termimg.Auto)
 	}
 
 	p := tea.NewProgram(
-		Doc{
+		doc,
-			content:      message,
-			title:        title,
-			initialwidth: width,
-			meta:         &meta,
-			config:       conf,
-			keys:         keys,
-		},
 		tea.WithAltScreen(),       // use the full size of the terminal in its "alternate screen buffer"
 		tea.WithMouseCellMotion(), // turn on mouse support so we can track the mouse wheel
 	)
 
 	if _, err := p.Run(); err != nil {
-		return 0, fmt.Errorf("could not run pager:", err)
+		return 0, fmt.Errorf("could not run pager: %w", err)
 	}
 
-	if conf.Debug {
+	if book.Config.Debug {
 		fmt.Printf("scrollto: %d, last: %d, diff: %d\n",
 			scrollto, meta.currentline, scrollto-meta.currentline)
 	}

cmd/root.go

@@ -1,3 +1,19 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package cmd
 
 import (
@@ -27,6 +43,15 @@ func Execute(output io.Writer) int {
 		return 0
 	}
 
+	if conf.ShowHelp {
+		_, err := fmt.Fprintln(output, Usage)
+		if err != nil {
+			return Die(fmt.Errorf("failed to print to output: %s", err))
+		}
+
+		return 0
+	}
+
 	if conf.StoreProgress {
 		progress, err := GetProgress(conf)
 		if err == nil {

cmd/store.go

@@ -1,9 +1,26 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package cmd
 
 import (
 	"bufio"
 	"errors"
 	"fmt"
+	"log"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -21,20 +38,28 @@ func StoreProgress(conf *Config, progress int) error {
 	cfgpath := conf.GetConfigDir()
 
 	if err := Mkdir(cfgpath); err != nil {
-		return err
+		return fmt.Errorf("failed to mkdir config path %s: %w", cfgpath, err)
 	}
 
 	filename := filepath.Join(cfgpath, Slug(conf.Document))
 
 	fd, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to open state file %s: %w", filename, err)
 	}
-	defer fd.Close()
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
 
-	_, err = fd.WriteString(fmt.Sprintf("%d\n", progress))
+	if err := fd.Truncate(0); err != nil {
+		return fmt.Errorf("failed to truncate state file %s: %w", filename, err)
+	}
+
+	_, err = fmt.Fprintf(fd, "%d\n", progress)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to write to state file %s: %w", filename, err)
 	}
 
 	return nil
@@ -49,7 +74,11 @@ func GetProgress(conf *Config) (int64, error) {
 	if err != nil {
 		return 0, nil // ignore errors and return no progress
 	}
-	defer fd.Close()
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
 
 	scanner := bufio.NewScanner(fd)
 	var line string

cmd/view.go

@@ -1,3 +1,19 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package cmd
 
 import (
@@ -6,6 +22,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/alecthomas/repr"
 	"github.com/tlinden/epuppy/pkg/epub"
 )
 
@@ -24,15 +41,27 @@ func ViewText(conf *Config) (int, error) {
 		return 0, err
 	}
 
-	return Pager(conf, conf.Document, string(data))
+	if conf.Dump {
+		return fmt.Println(string(data))
+	}
+
+	return Pager(&Ebook{
+		Config: conf,
+		Title:  conf.Document,
+		Body:   string(data),
+	})
 }
 
 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 book.Close()
+
+	if conf.Debug {
+		repr.Println(book.Files())
+		repr.Println(book.Ncx)
+	}
 
 	buf := strings.Builder{}
 	head := strings.Builder{}
@@ -49,9 +78,28 @@ 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())
+	}
+
+	if conf.Debug {
+		return 0, nil
+	}
+
+	return Pager(&Ebook{
+		Config:    conf,
+		Title:     head.String(),
+		Body:      buf.String(),
+		Cover:     book.CoverImage,
+		MediaType: book.CoverMediaType,
+	})
+}
+
+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 {
@@ -61,11 +109,20 @@ func ViewEpub(conf *Config) (int, error) {
 
 			}
 			buf.WriteString("\r\n\r\n")
-			buf.WriteString(conf.Colors.Body.Render(content.Body))
+
+			if conf.Dump {
+				// avoid excess whitespaces when printing to stdout
+				buf.WriteString(content.Body)
+			} else {
+				buf.WriteString(conf.Colors.Body.Render(content.Body))
+			}
+
 			buf.WriteString("\r\n\r\n\r\n\r\n")
 			chapter++
+
+			gotbody = true
 		}
 	}
 
-	return Pager(conf, head.String(), buf.String())
+	return gotbody
 }

go.mod

@@ -5,16 +5,23 @@ go 1.24.0
 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
 	github.com/knadh/koanf/v2 v2.3.0
+	github.com/muesli/reflow v0.3.0
 	github.com/spf13/pflag v1.0.10
+	golang.org/x/term v0.36.0
 )
 
 require (
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
-	github.com/charmbracelet/bubbles v0.21.0 // indirect
+	github.com/charmbracelet/bubbles v0.21.0
-	github.com/charmbracelet/bubbletea v1.3.10 // indirect
+	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
-	github.com/charmbracelet/lipgloss v1.1.0 // indirect
+	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/charmbracelet/x/ansi v0.10.1 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
 	github.com/charmbracelet/x/term v0.2.1 // indirect
@@ -28,23 +35,27 @@ require (
 	github.com/muesli/termenv v0.16.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	golang.org/x/sync v0.11.0 // 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/alecthomas/repr v0.5.2 // indirect
+	github.com/antchfx/xpath v1.3.5 // indirect
+	github.com/blacktop/go-termimg v0.1.20 // indirect
+	github.com/charmbracelet/x/mosaic v0.0.0-20250702191427-5bdfc8f2e4ff // 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/knadh/koanf/parsers/toml v0.1.0 // indirect
+	github.com/makeworld-the-better-one/dither/v2 v2.4.0 // indirect
-	github.com/knadh/koanf/providers/file v1.2.0 // indirect
+	github.com/mattn/go-sixel v0.0.5 // indirect
-	github.com/knadh/koanf/providers/posflag v1.0.1 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
-	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
-	github.com/muesli/reflow v0.3.0 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
-	golang.org/x/term v0.36.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/soniakeys/quant v1.0.0 // indirect
+	golang.org/x/image v0.25.0 // indirect
+	golang.org/x/net v0.44.0 // indirect
+	golang.org/x/tools v0.37.0 // indirect
 )

go.sum

@@ -1,175 +1,45 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 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/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/antchfx/xmlquery v1.5.0 h1:uAi+mO40ZWfyU6mlUBxRVvL6uBNZ6LMU4M3+mQIBV4c=
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/antchfx/xmlquery v1.5.0/go.mod h1:lJfWRXzYMK1ss32zm1GQV3gMIW/HFey3xDZmkP1SuNc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/antchfx/xpath v1.3.5 h1:PqbXLC3TkfeZyakF5eeh3NTWEbYl4VHNVeufANzDbKQ=
-github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/antchfx/xpath v1.3.5/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
-github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
-github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
-github.com/aws/aws-sdk-go-v2 v1.9.2/go.mod h1:cK/D0BBs0b/oWPIcX/Z/obahJK1TT7IPVjy53i/mX/4=
-github.com/aws/aws-sdk-go-v2/config v1.8.3/go.mod h1:4AEiLtAb8kLs7vgw2ZV3p2VZ1+hBavOc84hqxVNpCyw=
-github.com/aws/aws-sdk-go-v2/credentials v1.4.3/go.mod h1:FNNC6nQZQUuyhq5aE5c7ata8o9e4ECGmS4lAXC7o1mQ=
-github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.6.0/go.mod h1:gqlclDEZp4aqJOancXK6TN24aKhT0W0Ae9MHk3wzTMM=
-github.com/aws/aws-sdk-go-v2/internal/ini v1.2.4/go.mod h1:ZcBrrI3zBKlhGFNYWvju0I3TR93I7YIgAfy82Fh4lcQ=
-github.com/aws/aws-sdk-go-v2/service/appconfig v1.4.2/go.mod h1:FZ3HkCe+b10uFZZkFdvf98LHW21k49W8o8J366lqVKY=
-github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.3.2/go.mod h1:72HRZDLMtmVQiLG2tLfQcaWLCssELvGl+Zf2WVxMmR8=
-github.com/aws/aws-sdk-go-v2/service/sso v1.4.2/go.mod h1:NBvT9R1MEF+Ud6ApJKM0G+IkPchKS7p7c2YPKwHmBOk=
-github.com/aws/aws-sdk-go-v2/service/sts v1.7.2/go.mod h1:8EzeIqfWt2wWT4rJVu3f21TfrhJ8AEMzVybRNSb/b4g=
-github.com/aws/smithy-go v1.8.0/go.mod h1:SObp3lf9smib00L/v3U2eAKG8FyQ7iLrJnQiAmR5n+E=
 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/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/aymanbagabas/go-udiff v0.2.0 h1:TK0fH4MteXUDspT88n8CKzvK0X9O2xu9yQjWpi6yML8=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/aymanbagabas/go-udiff v0.2.0/go.mod h1:RE4Ex0qsGkTAJoQdQQCA0uG+nAzJO/pI/QwceO5fgrA=
-github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/blacktop/go-termimg v0.1.20 h1:+EAUc3c9hwE/fUYaqRV1BSLvAlOuLySgLTEBzxGbYK4=
-github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/blacktop/go-termimg v0.1.20/go.mod h1:nwxrOjfFcBjtS358oIGBLfscSLnCpNdRlMVRxsnZwMU=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/charmbracelet/bubbles v0.21.0 h1:9TdC97SdRVg/1aaXNVWfFH3nnLAwOXr8Fn6u6mfQdFs=
 github.com/charmbracelet/bubbles v0.21.0/go.mod h1:HF+v6QUR4HkEpz62dx7ym2xc71/KBHg+zKwJtMw+qtg=
-github.com/charmbracelet/bubbletea v1.3.4 h1:kCg7B+jSCFPLYRA52SDZjr51kG/fMUEoPoZrkaDHyoI=
-github.com/charmbracelet/bubbletea v1.3.4/go.mod h1:dtcUCyCGEX3g9tosuYiut3MXgY/Jsv9nKVdibKKRRXo=
 github.com/charmbracelet/bubbletea v1.3.10 h1:otUDHWMMzQSB0Pkc87rm691KZ3SWa4KUlvF9nRvCICw=
 github.com/charmbracelet/bubbletea v1.3.10/go.mod h1:ORQfo0fk8U+po9VaNvnV95UPWA1BitP1E0N6xJPlHr4=
 github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc h1:4pZI35227imm7yK2bGPcfpFEmuY1gc2YSTShr4iJBfs=
 github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc/go.mod h1:X4/0JoqgTIPSFcRA/P6INZzIuyqdFY5rm8tb41s9okk=
 github.com/charmbracelet/lipgloss v1.1.0 h1:vYXsiLHVkK7fp74RkV7b2kq9+zDLoEU4MZoFqR/noCY=
 github.com/charmbracelet/lipgloss v1.1.0/go.mod h1:/6Q8FR2o+kj8rz4Dq0zQc3vYf7X+B0binUUBwA0aL30=
-github.com/charmbracelet/x/ansi v0.8.0 h1:9GTq3xq9caJW8ZrBTe0LIe2fvfLR/bYXKTx2llXn7xE=
-github.com/charmbracelet/x/ansi v0.8.0/go.mod h1:wdYl/ONOLHLIVmQaxbIYEC/cRKOQyjTkowiI4blgS9Q=
 github.com/charmbracelet/x/ansi v0.10.1 h1:rL3Koar5XvX0pHGfovN03f5cxLbCF2YvLeyz7D2jVDQ=
 github.com/charmbracelet/x/ansi v0.10.1/go.mod h1:3RQDQ6lDnROptfpWuUVIUG64bD2g2BgntdxH0Ya5TeE=
 github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd h1:vy0GVL4jeHEwG5YOXDmi86oYw2yuYUGqz6a8sLwg0X8=
 github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
+github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91 h1:payRxjMjKgx2PaCWLZ4p3ro9y97+TVLZNaRZgJwSVDQ=
+github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
+github.com/charmbracelet/x/mosaic v0.0.0-20250702191427-5bdfc8f2e4ff h1:OVBKPzoa0k5ZVMoor27BReRZxER1IEDtLHXkRjaHElg=
+github.com/charmbracelet/x/mosaic v0.0.0-20250702191427-5bdfc8f2e4ff/go.mod h1:5qLP4S++M5quSc/xbvWWW8vKkgKwOqOT/IVhAas26XI=
 github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
 github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
-github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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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 v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
-golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
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 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/tools v0.0.0-20190907020128-2ca718005c18/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
-golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
-golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/tools v0.37.0 h1:DVSRzp7FwePZW356yEAChSdNcQo6Nsp+fex1SUW09lE=
+golang.org/x/tools v0.37.0/go.mod h1:MBN5QPQtLMHVdvsbtarmTNukZDdgwdwlO5qGacAzF0w=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20190404172233-64821d5d2107/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
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-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
-google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
-google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
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-google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
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-gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d/go.mod h1:cuepJuh7vyXfUyUwEgHQXw849cJrilpS5NeIjOWESAw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

main.go

@@ -1,3 +1,19 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
 package main
 
 import (

main_test.go

@@ -0,0 +1,38 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"testing"
+
+	"github.com/rogpeppe/go-internal/testscript"
+)
+
+// see https://bitfieldconsulting.com/golang/test-scripts
+
+func TestMain(m *testing.M) {
+	testscript.Main(m, map[string]func(){
+		"epuppy": main,
+	})
+}
+
+func TestEpuppy(t *testing.T) {
+	testscript.Run(t, testscript.Params{
+		Dir: "t",
+	})
+}

mkrel.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright © 2024 Thomas von Dein
+# Copyright © 2025 Thomas von Dein
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

pkg/epub/README.md

@@ -0,0 +1,21 @@
+# epub module
+
+This is a modified version of the [epub
+module](https://github.com/kapmahc/epub/). I fixed a couple of issues
+and I added code to retrieve the actual epub content, which the
+original module doesn't implement. Since the last update on that
+module was 9 years ago (as I write this), it doesn't make sense to
+send a PR. And it also makes no sense to me to publish it separately.
+
+
+# ORIGINAL README
+
+## epub
+A pure go implementation of epub file format.
+
+
+
+### Documents
+- <http://idpf.org/epub>
+- <http://www.cnblogs.com/Alex80/p/5127104.html>
+- <http://www.cnblogs.com/diligenceday/p/4999315.html>

pkg/epub/book.go

@@ -5,18 +5,21 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
+	"log"
 	"path"
 )
 
 // Book epub book
 type Book struct {
-	Ncx       Ncx       `json:"ncx"`
+	Ncx            Ncx       `json:"ncx"`
-	Opf       Opf       `json:"opf"`
+	Opf            Opf       `json:"opf"`
-	Container Container `json:"-"`
+	Container      Container `json:"-"`
-	Mimetype  string    `json:"-"`
+	Mimetype       string    `json:"-"`
-	Content   []Content
+	Content        []Content
-
+	fd             *zip.ReadCloser
-	fd *zip.ReadCloser
+	CoverImage     []byte
+	CoverFile      string
+	CoverMediaType string
 }
 
 // Open open resource file
@@ -33,11 +36,6 @@ func (p *Book) Files() []string {
 	return fns
 }
 
-// Close close file reader
-func (p *Book) Close() {
-	p.fd.Close()
-}
-
 // -----------------------------------------------------------------------------
 func (p *Book) filename(n string) string {
 	return path.Join(path.Dir(p.Container.Rootfile.Path), n)
@@ -48,7 +46,13 @@ 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 +67,11 @@ 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/container.go

@@ -1,11 +1,11 @@
 package epub
 
-//Container META-INF/container.xml file
+// Container META-INF/container.xml file
 type Container struct {
 	Rootfile Rootfile `xml:"rootfiles>rootfile" json:"rootfile"`
 }
 
-//Rootfile root file
+// Rootfile root file
 type Rootfile struct {
 	Path string `xml:"full-path,attr" json:"path"`
 	Type string `xml:"media-type,attr" json:"type"`

pkg/epub/content.go

@@ -1,19 +1,17 @@
 package epub
 
 import (
-	"encoding/xml"
-	"fmt"
 	"regexp"
 	"strings"
+
+	"github.com/antchfx/xmlquery"
 )
 
 var (
-	cleantitle    = regexp.MustCompile(`(?s)<head>.*</head>`)
+	cleanentitles = regexp.MustCompile(`&[a-z]+;`)
+	empty         = regexp.MustCompile(`(?s)^[\s ]*$`)
+	newlines      = regexp.MustCompile(`[\r\n]+`)
 	cleanmarkup   = regexp.MustCompile(`<[^<>]+>`)
-	cleanentities = regexp.MustCompile(`&.+;`)
-	cleancomments = regexp.MustCompile(`/*.*/`)
-	cleanspace    = regexp.MustCompile(`^\s*`)
-	cleanh1       = regexp.MustCompile(`<h[1-6].*</h[1-6]>`)
 )
 
 // Content nav-point content
@@ -25,27 +23,46 @@ type Content struct {
 	XML   []byte
 }
 
+// parse XML, look for title and <p>.*</p> stuff
 func (c *Content) String(content []byte) error {
-	title := Title{}
+	doc, err := xmlquery.Parse(
-
+		strings.NewReader(
-	err := xml.Unmarshal(content, &title)
+			cleanentitles.ReplaceAllString(string(content), " ")))
 	if err != nil {
-		if !strings.HasPrefix(err.Error(), "XML syntax error") {
+		return err
-			return fmt.Errorf("XML parser error %w", err)
+	}
+
+	if c.Title == "" {
+		// extract the title
+		for _, item := range xmlquery.Find(doc, "//title") {
+			c.Title = strings.TrimSpace(item.InnerText())
 		}
 	}
 
-	c.Title = strings.TrimSpace(title.Content)
+	// extract all  paragraphs, ignore any formatting  and re-fill the
+	// paragraph,  that is, we  replace all newlines inside  with one
+	// space.
+	txt := strings.Builder{}
+	var have_p bool
+	for _, item := range xmlquery.Find(doc, "//p") {
+		if !empty.MatchString(item.InnerText()) {
+			have_p = true
+			txt.WriteString(newlines.ReplaceAllString(item.InnerText(), " ") + "\n\n")
+		}
+	}
 
-	txt := cleantitle.ReplaceAllString(string(content), "")
+	if !have_p {
-	txt = cleanh1.ReplaceAllString(txt, "")
+		// try  <div></div>, which some  ebooks use, so get  all divs,
-	txt = cleanmarkup.ReplaceAllString(txt, "")
+		// remove markup and paragraphify the parts
-	txt = cleanentities.ReplaceAllString(txt, " ")
+		for _, item := range xmlquery.Find(doc, "//div") {
-	txt = cleancomments.ReplaceAllString(txt, "")
+			if !empty.MatchString(item.InnerText()) {
+				cleaned := cleanmarkup.ReplaceAllString(item.InnerText(), "")
+				txt.WriteString(newlines.ReplaceAllString(cleaned, " ") + "\n\n")
+			}
+		}
+	}
 
-	txt = strings.TrimSpace(txt)
+	c.Body = strings.TrimSpace(txt.String())
-
-	c.Body = cleanspace.ReplaceAllString(txt, "")
 	c.XML = content
 
 	if len(c.Body) == 0 {

pkg/epub/epub_test.go

@@ -5,19 +5,17 @@ import (
 )
 
 func TestEpub(t *testing.T) {
-	bk, err := open(t, "test.epub")
+	_, err := open(t, "test.epub")
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer bk.Close()
 }
 
 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 bk.Close()
 
 	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

@@ -2,17 +2,26 @@ package epub
 
 import (
 	"archive/zip"
+	"fmt"
+	"log"
+	"os"
 	"strings"
+
+	"github.com/alecthomas/repr"
 )
 
 // 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
 	}
 
-	defer fd.Close()
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
 
 	bk := Book{fd: fd}
 	mt, err := bk.readBytes("mimetype")
@@ -38,27 +47,66 @@ func Open(fn string) (*Book, error) {
 			if err != nil {
 				return &bk, err
 			}
+		}
 
-			break
+		if mf.ID == "cover-image" {
+			bk.CoverFile = mf.Href
+			bk.CoverMediaType = mf.MediaType
 		}
 	}
 
-	for _, file := range bk.Files() {
+	type section struct {
-		content, err := bk.readBytes(file)
+		file, title string
+	}
+
+	sections := []section{}
+
+	if len(bk.Ncx.Points) > 0 {
+		for _, block := range bk.Ncx.Points {
+			sections = append(sections,
+				section{
+					file:  "OEBPS/" + block.Content.Src,
+					title: block.Text,
+				})
+		}
+	} else {
+		for _, file := range bk.Files() {
+			sections = append(sections,
+				section{
+					file: file,
+				})
+		}
+	}
+
+	for _, section := range sections {
+		content, err := bk.readBytes(section.file)
 		if err != nil {
 			return &bk, err
 		}
 
-		ct := Content{Src: file}
+		if strings.Contains(section.file, bk.CoverFile) {
+			bk.CoverImage = content
+		}
 
-		if strings.Contains(string(content), "DOCTYPE") {
+		ct := Content{Src: section.file, Title: section.title}
+
+		if strings.Contains(string(content), "<?xml") || strings.Contains(string(content), "<!DOCTYPE") {
 			if err := ct.String(content); err != nil {
 				return &bk, err
 			}
 		}
 
+		if dumpxml {
+			fmt.Println(string(ct.XML))
+		}
+
 		bk.Content = append(bk.Content, ct)
 	}
 
+	if dumpxml {
+		repr.Println(sections)
+		os.Exit(0)
+	}
+
 	return &bk, nil
 }

pkg/epub/opf.go

@@ -1,13 +1,13 @@
 package epub
 
-//Opf content.opf
+// Opf content.opf
 type Opf struct {
 	Metadata Metadata   `xml:"metadata" json:"metadata"`
 	Manifest []Manifest `xml:"manifest>item" json:"manifest"`
 	Spine    Spine      `xml:"spine" json:"spine"`
 }
 
-//Metadata metadata
+// Metadata metadata
 type Metadata struct {
 	Title       []string     `xml:"title" json:"title"`
 	Language    []string     `xml:"language" json:"language"`
@@ -53,7 +53,7 @@ type Metafield struct {
 	Content string `xml:"content,attr" json:"content"`
 }
 
-//Manifest manifest
+// Manifest manifest
 type Manifest struct {
 	ID           string `xml:"id,attr" json:"id"`
 	Href         string `xml:"href,attr" json:"href"`

t/basic.txtar

@@ -0,0 +1,7 @@
+# no args shall fail
+! exec epuppy
+
+# help
+exec epuppy -h
+stdout 'This is epuppy'
+