Implement option for tab size

README.md

@@ -49,6 +49,7 @@ marginTop = 50    # Margin at the top edge of each page.
 marginRight = 25  # ... on the right edge of each page.
 marginBottom = 50 # ... on the bottom edge of each page.
 marginLeft = 25   # ... on the left edge of each page.
+tabSize = 4       # Replaces tabs with this many spaces.
 keepPDF = true    # When true, does not delete generated PDF after print.
 
 [printer]
@@ -64,3 +65,4 @@ contestID = "..."           # The 24 character hex ID of the contest goes here.
 ## To-dos
 
 - [x] Windows support
+- [ ] Improve tab-to-spaces behavior

config.go

@@ -14,6 +14,7 @@ type Config struct {
 		MarginRight  float64
 		MarginBottom float64
 		MarginLeft   float64
+		TabSize      int
 		KeepPDF      bool
 	}
 	Printer struct {

pdf.go

@@ -4,6 +4,7 @@ import (
 	_ "embed"
 	"fmt"
 	"log"
+	"strings"
 
 	"github.com/signintech/gopdf"
 )
@@ -40,7 +41,7 @@ func (b PDFBuilder) Build(name string, pr Print) error {
 
 	linesperpage -= len(headerlines) + 2
 
-	lines, err := pdf.SplitText(pr.Content, pagesize.W-pdf.MarginLeft()-pdf.MarginRight())
+	lines, err := pdf.SplitText(b.tabToSpaces(pr.Content), pagesize.W-pdf.MarginLeft()-pdf.MarginRight())
 	if err != nil {
 		return err
 	}
@@ -95,6 +96,10 @@ func (b PDFBuilder) newLine(pdf *gopdf.GoPdf) {
 	pdf.SetNewXY(pdf.GetY()+float64(b.cfg.Printd.LineHeight), pdf.MarginLeft(), float64(b.cfg.Printd.LineHeight))
 }
 
+func (b PDFBuilder) tabToSpaces(t string) string {
+	return strings.ReplaceAll(t, "\t", strings.Repeat(" ", b.cfg.Printd.TabSize))
+}
+
 var (
 	gopdfPageSizes = map[PageSize]*gopdf.Rect{
 		PageA4:     gopdf.PageSizeA4,