Add split-output to cli

cmd/covergen/main.go

@@ -26,6 +26,7 @@ var customer = pflag.StringP("customer", "c", "", "Customer name for cover")
 var numberPrefix = pflag.String("number-prefix", "offerte", "Prefix to use for number")
 var color = pflag.String("color", "random", "Selects a color to use for the grid highlight. Valid choices: ['random', 'red', 'blue', 'yellow', 'green']")
 var output = pflag.StringP("output", "o", "cover.pdf", "File to output to")
+var output2 = pflag.StringP("output-back", "b", "", "Output front and back separately")
 
 func init() {
 	log.Logger = zerolog.New(zerolog.ConsoleWriter{Out: os.Stderr, TimeFormat: time.RFC3339}).With().Timestamp().Logger()
@@ -69,13 +70,15 @@ func main() {
 	}
 
 	*customer = strings.ReplaceAll(*customer, "\\n", "\n")
-
+	settings := covergen.CoverSettings{
-	pdf, err := covergen.GenerateInvoice(covergen.CoverSettings{
 		Number:       *number,
 		NumberPrefix: *numberPrefix,
 		CustomerName: *customer,
 		HLColor:      chosenColor,
-	})
+	}
+
+	if *output2 == "" {
+		pdf, err := covergen.GenerateInvoice(settings)
 
 		if err != nil {
 			log.Fatal().Err(err).Msg("Failed to render invoice")
@@ -84,4 +87,22 @@ func main() {
 		if err := pdf.OutputFileAndClose(*output); err != nil {
 			log.Fatal().Err(err).Msg("Failed to write invoice to disk")
 		}
+	} else {
+		front, err := covergen.GenerateFrontCover(settings)
+		if err != nil {
+			log.Fatal().Err(err).Msg("Failed to render front")
+		}
+		if err := front.OutputFileAndClose(*output); err != nil {
+			log.Fatal().Err(err).Msg("Failed to write front to disk")
+		}
+
+		back, err := covergen.GenerateBackCover(settings)
+		if err != nil {
+			log.Fatal().Err(err).Msg("Failed to render back")
+		}
+		if err := back.OutputFileAndClose(*output2); err != nil {
+			log.Fatal().Err(err).Msg("Failed to write back to disk")
+		}
+	}
+
 }

pkg/covergen/render.go

@@ -6,7 +6,6 @@ import (
 	"strings"
 
 	"github.com/go-pdf/fpdf"
-	"github.com/rs/zerolog/log"
 )
 
 const margin = 20
@@ -44,17 +43,58 @@ type CoverSettings struct {
 }
 
 func GenerateInvoice(settings CoverSettings) (*fpdf.Fpdf, error) {
+	pdf, err := GenerateFrontCover(settings)
+	if err != nil {
+		return nil, err
+	}
+
+	pdf.AddPage()
+	drawCustomerName(pdf, settings)
+
+	if pdf.Err() {
+		return nil, pdf.Error()
+	}
+
+	return pdf, nil
+}
+
+func GenerateFrontCover(settings CoverSettings) (*fpdf.Fpdf, error) {
+	pdf, err := generateBaseInvoice(settings)
+	if err != nil {
+		return nil, err
+	}
+
+	drawInvoiceNumber(pdf, settings)
+	drawMiwebbLink(pdf)
+
+	if pdf.Err() {
+		return nil, pdf.Error()
+	}
+
+	return pdf, nil
+}
+
+func GenerateBackCover(settings CoverSettings) (*fpdf.Fpdf, error) {
+	pdf, err := generateBaseInvoice(settings)
+	if err != nil {
+		return nil, err
+	}
+
+	return pdf, err
+}
+
+func generateBaseInvoice(settings CoverSettings) (*fpdf.Fpdf, error) {
 	pdf := fpdf.New("P", scaleUnit, "A4", "")
 
 	if err := addEmbeddedFont(pdf, "Mark Medium", "", "Mark-Medium"); err != nil {
-		log.Fatal().Err(err).Msg("Error adding font")
+		return nil, fmt.Errorf("error adding font: %w", err)
 	}
 	if err := addEmbeddedFont(pdf, "Mark Light", "", "Mark-Light"); err != nil {
-		log.Fatal().Err(err).Msg("Error adding font")
+		return nil, fmt.Errorf("error adding font: %w", err)
 	}
-	miwebbLogo, err := addEmbeddedLogo(pdf, miwebbLogoName, miwebbLogoPath)
+	miwebbLogo, err := addEmbeddedLogo(pdf, miwebbLogoName, "miwebb.white.png")
 	if err != nil {
-		log.Fatal().Err(err).Msg("Error adding logo")
+		return nil, fmt.Errorf("error adding logo: %w", err)
 	}
 
 	pdf.SetMargins(margin, margin, margin)
@@ -67,21 +107,16 @@ func GenerateInvoice(settings CoverSettings) (*fpdf.Fpdf, error) {
 		pdf.Image(miwebbLogoName, margin-5, margin, miwebbLogo.Width()*logoScale, miwebbLogo.Height()*logoScale, false, "", 0, "")
 	})
 
-	pdf.AddPage()
-
-	drawCustomerName(pdf, settings)
-	drawInvoiceNumber(pdf, settings)
-	drawMiwebbLink(pdf)
-
 	pdf.AddPage()
 	drawCustomerName(pdf, settings)
 
 	if pdf.Err() {
-		return nil, pdf.Error()
+		return nil, fmt.Errorf("error generating invoice: %w", pdf.Error())
 	}
 
 	return pdf, nil
 }
+
 func drawInvoiceNumber(pdf *fpdf.Fpdf, settings CoverSettings) {
 	_, pageHeight := pdf.GetPageSize()