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// Copyright 2021 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
package main
import (
"bufio"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strings"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/app"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/dialog"
"fyne.io/fyne/v2/layout"
"fyne.io/fyne/v2/theme"
"fyne.io/fyne/v2/widget"
)
// copyStdoutToChan creates a pipe to copy anything written
// to the file also to a rune channel.
func copyStdoutToChan() (chan rune, error) {
c := make(chan rune)
origFile := os.Stdout
r, w, err := os.Pipe()
if err != nil {
return c, fmt.Errorf("Error creating pipe for file redirection: %v", err)
}
os.Stdout = w
bufReader := bufio.NewReader(r)
go func() {
defer func() {
close(c)
w.Close()
os.Stdout = origFile
}()
for {
r, _, err := bufReader.ReadRune()
if err != nil && err != io.EOF {
return
}
c <- r
if err == io.EOF {
return
}
}
}()
return c, nil
}
// copyStderrToChan creates a pipe to copy anything written
// to the file also to a rune channel.
// TODO: would be nice to merge this with copyStdoutToChan,
// but a naive version using *os.File didn't work.
func copyStderrToChan() (chan rune, error) {
c := make(chan rune)
origFile := os.Stderr
r, w, err := os.Pipe()
if err != nil {
return c, fmt.Errorf("Error creating pipe for file redirection: %v", err)
}
os.Stderr = w
bufReader := bufio.NewReader(r)
go func() {
defer func() {
close(c)
w.Close()
os.Stderr = origFile
}()
for {
r, _, err := bufReader.ReadRune()
if err != nil && err != io.EOF {
return
}
c <- r
if err == io.EOF {
return
}
}
}()
return c, nil
}
// startGui starts the gui process
func startGui(log log.Logger, cmd string, training string, tessdir string) error {
myApp := app.New()
myWindow := myApp.NewWindow("Rescribe OCR")
myWindow.Resize(fyne.NewSize(800, 400))
var gobtn *widget.Button
var fullContent *fyne.Container
dir := widget.NewLabel("")
dirIcon := widget.NewIcon(theme.FolderIcon())
folderBtn := widget.NewButtonWithIcon("Choose folder", theme.FolderOpenIcon(), func() {
dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
if err == nil && uri != nil {
dir.SetText(uri.Path())
dirIcon.SetResource(theme.FolderIcon())
myWindow.SetContent(fullContent)
gobtn.Enable()
}
}, myWindow)
})
pdfBtn := widget.NewButtonWithIcon("Choose PDF", theme.DocumentIcon(), func() {
dialog.ShowFileOpen(func(uri fyne.URIReadCloser, err error) {
if err == nil && uri != nil {
uri.Close()
dir.SetText(uri.URI().Path())
dirIcon.SetResource(theme.DocumentIcon())
myWindow.SetContent(fullContent)
gobtn.Enable()
}
}, myWindow)
})
gbookBtn := widget.NewButtonWithIcon("Get Google Book", theme.SearchIcon(), func() {
// TODO
})
progressBar := widget.NewProgressBar()
logarea := widget.NewMultiLineEntry()
logarea.Disable()
// TODO: have the button be pressed if enter is pressed
gobtn = widget.NewButtonWithIcon("Start OCR", theme.UploadIcon(), func() {
if dir.Text == "" {
return
}
gobtn.Disable()
gobtn.SetText("Processing...")
progressBar.SetValue(0.5)
stdout, err := copyStdoutToChan()
if err != nil {
fmt.Fprintf(os.Stderr, "Error copying stdout to chan: %v\n", err)
return
}
// update log area with stdout in a concurrent goroutine
go func() {
for r := range stdout {
logarea.SetText(logarea.Text + string(r))
logarea.CursorRow = strings.Count(logarea.Text, "\n")
// TODO: set text on progress bar to latest line printed using progressBar.TextFormatter, rather than just using a whole multiline entry like this
// TODO: parse the stdout and set progressBar based on that
}
}()
stderr, err := copyStderrToChan()
if err != nil {
fmt.Fprintf(os.Stderr, "Error copying stderr to chan: %v\n", err)
return
}
// update log area with stderr in a concurrent goroutine
go func() {
for r := range stderr {
logarea.SetText(logarea.Text + string(r))
logarea.CursorRow = strings.Count(logarea.Text, "\n")
// TODO: set text on progress bar, or a label below it, to latest line printed, rather than just using a whole multiline entry like this
}
}()
err = startProcess(log, cmd, dir.Text, filepath.Base(dir.Text), training, dir.Text, tessdir)
if err != nil {
// add a newline before this printing as another message from stdout
// or stderr may well be half way through printing
logarea.SetText(logarea.Text + fmt.Sprintf("\nError executing process: %v\n", err))
logarea.CursorRow = strings.Count(logarea.Text, "\n")
progressBar.SetValue(0.0)
gobtn.SetText("Process OCR")
gobtn.Enable()
return
}
progressBar.SetValue(1.0)
gobtn.SetText("Process OCR")
gobtn.Enable()
})
gobtn.Disable()
choices := container.New(layout.NewGridLayout(3), folderBtn, pdfBtn, gbookBtn)
chosen := container.New(layout.NewBorderLayout(nil, nil, dirIcon, nil), dirIcon, dir)
fullContent = container.NewVBox(choices, chosen, gobtn, progressBar, logarea)
startContent := container.NewVBox(choices, gobtn, progressBar, logarea)
myWindow.SetContent(startContent)
myWindow.Show()
myApp.Run()
return nil
}
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