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package main
import (
"context"
_ "embed"
"errors"
"fmt"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"github.com/gotk3/gotk3/gdk"
"github.com/gotk3/gotk3/glib"
"github.com/gotk3/gotk3/gtk"
"github.com/oxplot/pdfrankenstein/session"
)
const (
progName = "PDFrankenstein"
)
var (
cleanCSS *gtk.CssProvider
dirtyCSS *gtk.CssProvider
//go:embed splash.svg
splash []byte
//go:embed icon.svg
appIcon []byte
//go:embed loading.svg
loadingImgBytes []byte
loadingPix *gdk.Pixbuf
//go:embed nothumb.svg
noThumbImgBytes []byte
noThumbPix *gdk.Pixbuf
)
func shrinkHome(path string) string {
home, err := os.UserHomeDir()
if err != nil {
return path
}
dir, file := filepath.Split(path)
if strings.HasPrefix(dir, home) {
return filepath.Join("~"+dir[len(home):], file)
}
return path
}
var (
annotSinceLastSave bool
sessMu sync.Mutex
sess *session.Session
cancelLoad func()
mainWin *gtk.Window
mainStack *gtk.Stack
openBut *gtk.Button
saveBut *gtk.Button
closeBut *gtk.Button
hdrBar *gtk.HeaderBar
pageFlow *gtk.FlowBox
pageImages []*gtk.Image
pageLabels []*gtk.Label
openFilePath string
)
func showErrMsg(title string, msg string) {
d, err := gtk.DialogNew()
if err != nil {
log.Fatalf("unable to create dialog: %s", err)
}
defer d.Destroy()
d.SetTitle(title)
d.SetModal(true)
d.SetTransientFor(mainWin)
b, err := d.AddButton("Close", gtk.RESPONSE_OK)
if err != nil {
log.Fatalf("unable to create dialog button: %s", err)
}
b.SetMarginTop(10)
b.SetMarginBottom(10)
b.SetMarginStart(10)
b.SetMarginEnd(10)
l, err := gtk.LabelNew(msg)
if err != nil {
log.Fatalf("unable to create dialog label: %s", err)
}
l.SetMarginTop(10)
l.SetMarginBottom(10)
l.SetMarginStart(10)
l.SetMarginEnd(10)
con, err := d.GetContentArea()
if err != nil {
log.Fatalf("unable to get dialog content area: %s", err)
}
con.Add(l)
d.ShowAll()
_ = d.Run()
d.Close()
}
func loadThumbs(ctx context.Context, loadThumb func(p int) (string, error)) {
cnt := len(pageImages)
for i := 0; i < cnt; i++ {
select {
case <-ctx.Done():
return
default:
}
path, err := loadThumb(i)
if err != nil {
log.Printf("failed to load thumbnail: %s", err)
func(img *gtk.Image, path string) {
glib.IdleAdd(func() {
img.SetFromPixbuf(noThumbPix)
})
}(pageImages[i], path)
} else {
func(img *gtk.Image, path string) {
glib.IdleAdd(func() {
img.SetFromFile(path)
})
}(pageImages[i], path)
}
}
}
func addCSS(w gtk.IWidget, css *gtk.CssProvider) {
ctx, err := w.ToWidget().GetStyleContext()
if err != nil {
log.Fatalf("unable to get style context: %s", err)
}
ctx.AddProvider(css, gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
}
func removeCSS(w gtk.IWidget, css *gtk.CssProvider) {
ctx, err := w.ToWidget().GetStyleContext()
if err != nil {
log.Fatalf("unable to get style context: %s", err)
}
ctx.RemoveProvider(css)
}
func clearAnnotation(page int) {
d, err := gtk.DialogNewWithButtons("Clear page annotations?", mainWin, gtk.DIALOG_MODAL,
[]any{"Clear", gtk.RESPONSE_OK},
[]any{"Keep", gtk.RESPONSE_CANCEL})
if err != nil {
log.Fatalf("unable to create confirmation dialog: %s", err)
}
if d.Run() == gtk.RESPONSE_OK {
sessMu.Lock()
sess.Clear(page)
sessMu.Unlock()
pageLabels[page].SetText(strconv.Itoa(page + 1))
removeCSS(pageLabels[page], dirtyCSS)
}
d.Close()
d.Destroy()
}
func open(path string) {
var err error
if path == "" {
ofd, err := gtk.FileChooserDialogNewWith1Button(
"Open PDF File",
mainWin,
gtk.FILE_CHOOSER_ACTION_OPEN,
"Open",
gtk.RESPONSE_OK,
)
if err != nil {
log.Fatalf("failed to open file chooser: %s", err)
}
defer ofd.Destroy()
filter, err := gtk.FileFilterNew()
if err != nil {
log.Fatalf("failed to create file filter: %s", err)
}
filter.AddMimeType("application/pdf")
filter.SetName("PDF Document")
ofd.SetLocalOnly(true)
ofd.AddFilter(filter)
if ofd.Run() != gtk.RESPONSE_OK {
return
}
path = ofd.GetFilename()
ofd.Close()
}
mainWin.SetSensitive(false)
defer mainWin.SetSensitive(true)
sessMu.Lock()
sess, err = session.New(path)
sessMu.Unlock()
if err != nil {
log.Printf("failed to open '%s': %s", path, err)
glib.IdleAdd(func() { showErrMsg("Cannot load file", err.Error()) })
return
}
openFilePath = path
dir, file := filepath.Split(shrinkHome(path))
hdrBar.SetTitle(file)
hdrBar.SetSubtitle(dir)
openBut.Hide()
saveBut.Show()
closeBut.Show()
// Populate the UI with pages
pageImages = make([]*gtk.Image, sess.PageCount())
pageLabels = make([]*gtk.Label, sess.PageCount())
for i := range pageImages {
o, err := gtk.OverlayNew()
if err != nil {
log.Fatal("Unable to create overlay")
}
// Page thumb
img, err := gtk.ImageNewFromPixbuf(loadingPix)
if err != nil {
log.Fatalf("failed to create image asset: %s", err)
}
img.Show()
pageImages[i] = img
eb, err := gtk.EventBoxNew()
if err != nil {
log.Fatalf("unable to create event box: %s", err)
}
eb.SetHAlign(gtk.ALIGN_START)
eb.Add(img)
eb.AddEvents(int(gdk.BUTTON_PRESS_MASK))
func(page int) {
eb.Connect("button-press-event", func() {
annotate(page)
})
}(i)
eb.Show()
o.Add(eb)
// Page Label
l, err := gtk.LabelNew(strconv.Itoa(i + 1))
if err != nil {
log.Fatalf("unable to create label: %s", err)
}
addCSS(l, cleanCSS)
pageLabels[i] = l
l.Show()
eb, err = gtk.EventBoxNew()
if err != nil {
log.Fatalf("unable to create event box: %s", err)
}
eb.Show()
eb.SetHAlign(gtk.ALIGN_START)
eb.SetVAlign(gtk.ALIGN_END)
eb.SetMarginBottom(3)
eb.SetMarginStart(3)
eb.Add(l)
eb.AddEvents(int(gdk.BUTTON_PRESS_MASK))
func(page int) {
eb.Connect("button-press-event", func() {
sessMu.Lock()
annotated := sess.IsAnnotated(page)
sessMu.Unlock()
if annotated {
clearAnnotation(page)
}
})
}(i)
o.AddOverlay(eb)
o.Show()
pageFlow.Add(o)
}
var ctx context.Context
ctx, cancelLoad = context.WithCancel(context.Background())
go loadThumbs(ctx, func(p int) (string, error) {
sessMu.Lock()
defer sessMu.Unlock()
if sess == nil || sess.IsClosed() {
return "", errors.New("session is nil/closed")
}
return sess.Thumbnail(p)
})
mainStack.SetVisibleChildName("pages")
}
func annotate(page int) {
mainWin.SetSensitive(false)
mainStack.SetVisibleChildName("continue-in-inkscape")
go func() {
sessMu.Lock()
changed, err := sess.Annotate(page)
sessMu.Unlock()
glib.IdleAdd(func() {
mainWin.SetSensitive(true)
mainStack.SetVisibleChildName("pages")
if err != nil {
showErrMsg("Cannot annotate file", err.Error())
return
}
if changed {
annotSinceLastSave = true
pageLabels[page].SetText(fmt.Sprintf("%d : clear", page+1))
addCSS(pageLabels[page], dirtyCSS)
}
})
}()
}
func closeFile() bool {
sessMu.Lock()
if sess == nil || sess.IsClosed() {
sessMu.Unlock()
return true
}
sessMu.Unlock()
if annotSinceLastSave {
d, err := gtk.DialogNewWithButtons("Your changes will be lost!", mainWin, gtk.DIALOG_MODAL,
[]any{"Close anyway", gtk.RESPONSE_OK},
[]any{"Keep editing", gtk.RESPONSE_CANCEL})
if err != nil {
log.Fatalf("unable to create confirmation dialog: %s", err)
}
defer d.Destroy()
defer d.Close()
if d.Run() != gtk.RESPONSE_OK {
return false
}
}
pageFlow.GetChildren().Foreach(func(i any) {
if c, ok := i.(gtk.IWidget); ok {
pageFlow.Remove(c)
}
})
annotSinceLastSave = false
resetUIToStart()
sessMu.Lock()
if sess != nil {
cancelLoad()
sess.Close()
}
sessMu.Unlock()
openFilePath = ""
return true
}
func resetUIToStart() {
hdrBar.SetTitle("")
hdrBar.SetSubtitle("")
openBut.Show()
saveBut.Hide()
closeBut.Hide()
mainStack.SetVisibleChildName("splash")
}
func save() {
ofd, err := gtk.FileChooserDialogNewWith1Button(
"Save",
mainWin,
gtk.FILE_CHOOSER_ACTION_SAVE,
"Save",
gtk.RESPONSE_OK,
)
if err != nil {
log.Fatalf("failed to open file chooser: %s", err)
}
defer ofd.Destroy()
ofd.SetLocalOnly(true)
filter, err := gtk.FileFilterNew()
if err != nil {
log.Fatalf("failed to create file filter: %s", err)
}
filter.SetName("PDF documents")
filter.AddPattern("*.pdf")
filter.AddPattern("*.PDF")
ofd.AddFilter(filter)
ofd.SetFilename(openFilePath)
if ofd.Run() != gtk.RESPONSE_OK {
return
}
path := ofd.GetFilename()
ofd.Close()
if !strings.HasSuffix(strings.ToLower(path), ".pdf") {
path += ".pdf"
}
sessMu.Lock()
err = sess.Save(path)
sessMu.Unlock()
if err != nil {
glib.IdleAdd(func() { showErrMsg("Cannot save file", err.Error()) })
return
}
annotSinceLastSave = false
}
func initUI() error {
var err error
gtk.Init(nil)
// Assets
loadingPix, err = gdk.PixbufNewFromBytesOnly(loadingImgBytes)
if err != nil {
return fmt.Errorf("failed to create loading pixbuf: %s", err)
}
noThumbPix, err = gdk.PixbufNewFromBytesOnly(noThumbImgBytes)
if err != nil {
return fmt.Errorf("failed to create no thumb pixbuf: %s", err)
}
cleanCSS, err = gtk.CssProviderNew()
if err != nil {
return fmt.Errorf("failed to create css provider: %s", err)
}
cleanCSS.LoadFromData(
`label{border-radius:3px;padding:2px 6px;background:@theme_bg_color;opacity:0.8}`)
dirtyCSS, err = gtk.CssProviderNew()
if err != nil {
return fmt.Errorf("failed to create css provider: %s", err)
}
dirtyCSS.LoadFromData(`label{color:white;background:orange;opacity:1}`)
// Main window
mainWin, err = gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
return fmt.Errorf("failed to create main window: %s", err)
}
mainWin.Connect("delete-event", func() bool {
return !closeFile()
})
mainWin.Connect("destroy", func() {
gtk.MainQuit()
})
dragTarget, err := gtk.TargetEntryNew("text/uri-list", gtk.TARGET_OTHER_APP, 0)
if err != nil {
return fmt.Errorf("failed to create drag target: %s", err)
}
mainWin.DragDestSet(gtk.DEST_DEFAULT_ALL, []gtk.TargetEntry{*dragTarget}, gdk.ACTION_COPY)
mainWin.Connect("drag-data-received", func(_ *gtk.Window, _ *gdk.DragContext, x, y int, s *gtk.SelectionData, m int, t uint) {
uri := strings.SplitN(string(s.GetData()), "\r", 2)[0]
if !strings.HasPrefix(uri, "file://") {
return
}
if closeFile() {
open(strings.TrimPrefix(uri, "file://"))
}
})
iconPix, err := gdk.PixbufNewFromBytesOnly(appIcon)
if err != nil {
return fmt.Errorf("failed to create main icon pixbuf: %s", err)
}
mainWin.SetIcon(iconPix)
mainWin.Iconify()
mainWin.SetDefaultSize(640, 400)
hdrBar, err = gtk.HeaderBarNew()
if err != nil {
return fmt.Errorf("failed to create main header bar: %s", err)
}
hdrBar.SetDecorationLayout("icon:menu,minimize,close")
hdrBar.SetShowCloseButton(true)
mainWin.SetTitlebar(hdrBar)
mainStack, err = gtk.StackNew()
if err != nil {
return fmt.Errorf("failed to create main stack: %s", err)
}
mainWin.Add(mainStack)
// Main buttons
saveBut, err = gtk.ButtonNewWithLabel("Save")
if err != nil {
return fmt.Errorf("failed to create save button: %s", err)
}
saveBut.Connect("clicked", func() { save() })
closeBut, err = gtk.ButtonNewWithLabel("Close")
if err != nil {
return fmt.Errorf("failed to create close button: %s", err)
}
closeBut.Connect("clicked", func() { closeFile() })
openBut, err = gtk.ButtonNewWithLabel("Open PDF File")
if err != nil {
return fmt.Errorf("failed to create open button: %s", err)
}
openBut.Connect("clicked", func() { open("") })
hdrBar.Add(openBut)
hdrBar.Add(saveBut)
hdrBar.PackEnd(closeBut)
// Add splash
splashPix, err := gdk.PixbufNewFromBytesOnly(splash)
if err != nil {
return fmt.Errorf("failed to create pixbuf for splash: %s", err)
}
splashImg, err := gtk.ImageNewFromPixbuf(splashPix)
if err != nil {
return fmt.Errorf("failed to create image for splash: %s", err)
}
mainStack.AddNamed(splashImg, "splash")
mainStack.SetVisibleChildName("splash")
// Add continue in inkscape message
l, err := gtk.LabelNew("Continue in Inkscape.\nOnce done, save, close and return here.")
if err != nil {
return fmt.Errorf("unable to create label: %s", err)
}
mainStack.AddNamed(l, "continue-in-inkscape")
// Add page flow
pageFlow, err = gtk.FlowBoxNew()
if err != nil {
return fmt.Errorf("failed to create flowbox: %s", err)
}
pageFlow.SetSelectionMode(gtk.SELECTION_NONE)
pageFlow.SetMarginTop(10)
pageFlow.SetMarginBottom(10)
pageFlow.SetMarginStart(10)
pageFlow.SetMarginEnd(10)
scr, err := gtk.ScrolledWindowNew(nil, nil)
if err != nil {
return fmt.Errorf("failed to create scrolled window: %s", err)
}
scr.Add(pageFlow)
mainStack.AddNamed(scr, "pages")
mainWin.ShowAll()
resetUIToStart()
return nil
}
func run() error {
if err := initUI(); err != nil {
return fmt.Errorf("failed to initialize UI: %s", err)
}
if len(os.Args) > 1 {
glib.IdleAdd(func() { open(os.Args[1]) })
}
gtk.Main()
return nil
}
func main() {
log.SetFlags(0)
log.SetPrefix(strings.ToLower(progName) + ": ")
if err := run(); err != nil {
log.Fatal(err)
}
}