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package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"rescribe.xyz/gofpdf"
"rescribe.xyz/utils/pkg/hocr"
)
// see notebook for rationale; experimental
func pxToPt(i int) float64 {
return float64(i) / 5
}
func lineText(l hocr.OcrLine) string {
// TODO: handle cases of OcrLine being where the text is, and OcrChar being where the text is
var t string
for _, w := range l.Words {
if len(t) > 0 {
t += " "
}
t += w.Text
}
return t
}
func walker(pdf *gofpdf.Fpdf) filepath.WalkFunc {
return func(path string, info os.FileInfo, err error) error {
if info.IsDir() {
return nil
}
if !strings.HasSuffix(path, ".hocr") {
return nil
}
// TODO: have errors returned include the file path of the error
file, err := ioutil.ReadFile(path)
if err != nil {
return err
}
h, err := hocr.Parse(file)
if err != nil {
return err
}
// TODO: get page dimensions from image dimensions
pdf.AddPageFormat("P", gofpdf.SizeType{Wd: pxToPt(1414), Ht: pxToPt(2500)})
//pdf.SetTextRenderingMode(gofpdf.TextRenderingModeInvisible)
// TODO: add page image
for _, l := range h.Lines {
coords, err := hocr.BoxCoords(l.Title)
if err != nil {
return err
}
pdf.SetXY(pxToPt(coords[0]), pxToPt(coords[1]))
// TODO: html escape text
pdf.CellFormat(pxToPt(coords[2]), pxToPt(coords[3]), hocr.LineText(l), "", 0, "T", false, 0, "")
}
return nil
}
}
func main() {
// TODO: handle best
// TODO: take flags to do colour or binarised
// TODO: probably also take flags to resize / change quality in due course
flag.Usage = func() {
fmt.Fprintln(flag.CommandLine.Output(), "Usage: pdfbook hocrdir out.pdf")
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() != 2 {
flag.Usage()
return
}
// TODO: this will go in pdf.go in due course, potentially with a
// type which covers gofpdf.Fpdf, and an interface, so that
// the backend can be switched out like aws.go
pdf := gofpdf.New("P", "pt", "A4", "")
// Even though it's invisible, we need to add a font which can do UTF-8 so text is correctly rendered
// TODO: find a font that's closer to the average dimensions of the
// text we're dealing with, and put it somewhere sensible
pdf.AddUTF8Font("dejavu", "", "DejaVuSansCondensed.ttf")
pdf.SetFont("dejavu", "", 10)
pdf.SetAutoPageBreak(false, float64(0))
err := filepath.Walk(flag.Arg(0), walker(pdf))
if err != nil {
log.Fatalln("Failed to walk", flag.Arg(0), err)
}
err = pdf.OutputFileAndClose(flag.Arg(1))
if err != nil {
log.Fatalln("Failed to save", flag.Arg(1), err)
}
}
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