Erweiterung von Kurt Jungs gopdf, das leider nicht weiterentwickelt wird https://github.com/jung-kurt/gofpdf
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package main
// This command demonstrates the use of ghotscript to reduce the size
// of generated PDFs. This is based on a comment made by farkerhaiku:
// https://github.com/jung-kurt/gofpdf/issues/57#issuecomment-185843315
import (
"fmt"
"os"
"os/exec"
"github.com/jung-kurt/gofpdf"
)
func report(fileStr string, err error) {
if err == nil {
var info os.FileInfo
info, err = os.Stat(fileStr)
if err == nil {
fmt.Printf("%s: OK, size %d\n", fileStr, info.Size())
} else {
fmt.Printf("%s: bad stat\n", fileStr)
}
} else {
fmt.Printf("%s: %s\n", fileStr, err)
}
}
func newPdf() (pdf *gofpdf.Fpdf) {
pdf = gofpdf.New("P", "mm", "A4", "../../font")
pdf.SetCompression(false)
pdf.AddFont("Calligrapher", "", "calligra.json")
pdf.AddPage()
pdf.SetFont("Calligrapher", "", 35)
pdf.Cell(0, 10, "Enjoy new fonts with FPDF!")
return
}
func full(name string) {
report(name, newPdf().OutputFileAndClose(name))
}
func min(name string) {
cmd := exec.Command("gs", "-sDEVICE=pdfwrite",
"-dCompatibilityLevel=1.4",
"-dPDFSETTINGS=/screen", "-dNOPAUSE", "-dQUIET",
"-dBATCH", "-sOutputFile="+name, "-")
inPipe, err := cmd.StdinPipe()
if err == nil {
errChan := make(chan error, 1)
go func() {
errChan <- cmd.Start()
}()
err = newPdf().Output(inPipe)
if err == nil {
report(name, <-errChan)
} else {
report(name, err)
}
} else {
report(name, err)
}
}
func main() {
full("full.pdf")
min("min.pdf")
}