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() }() newPdf().Output(inPipe) report(name, <-errChan) } else { report(name, err) } } func main() { full("full.pdf") min("min.pdf") }