Refactor PDF content rendering: improve list indentation logic, add numbered code block rendering with gutter, and update text wrapping alignment.

.idea/workspace.xml

@@ -4,20 +4,12 @@
     <option name="autoReloadType" value="ALL" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="c64f46d5-641a-468c-8fc1-94edec1f2deb" name="Changes" comment="Initial commit: added Markdown to IHK Chemnitz PDF converter with core structure and features, including YAML config, Goldmark parser, and PDF renderer.">
+    <list default="true" id="c64f46d5-641a-468c-8fc1-94edec1f2deb" name="Changes" comment="Remove outdated `toc_pages.txt`, add new Go modules for IHK Chemnitz PDF rendering including diagrams, tables, and TOC functionality.">
-      <change afterPath="$PROJECT_DIR$/it-berufe-handreichung-vo2020-data(1).pdf" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/MarkdownToIHKChemnits" beforeDir="false" afterPath="$PROJECT_DIR$/MarkdownToIHKChemnits" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/config.go" beforeDir="false" afterPath="$PROJECT_DIR$/config.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/img-000.png" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/img-001.png" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/img-002.png" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/img-003.png" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/main.go" beforeDir="false" afterPath="$PROJECT_DIR$/main.go" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/markdown_parser.go" beforeDir="false" afterPath="$PROJECT_DIR$/markdown_parser.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/pdf_renderer.go" beforeDir="false" afterPath="$PROJECT_DIR$/pdf_renderer.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pdf_content.go" beforeDir="false" afterPath="$PROJECT_DIR$/pdf_content.go" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/projektarbeit.pdf" beforeDir="false" afterPath="$PROJECT_DIR$/projektarbeit.pdf" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/report.md" beforeDir="false" afterPath="$PROJECT_DIR$/report.md" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/toc_pages.txt" beforeDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -101,7 +93,9 @@
   </component>
   <component name="VcsManagerConfiguration">
     <MESSAGE value="Initial commit: added Markdown to IHK Chemnitz PDF converter with core structure and features, including YAML config, Goldmark parser, and PDF renderer." />
-    <option name="LAST_COMMIT_MESSAGE" value="Initial commit: added Markdown to IHK Chemnitz PDF converter with core structure and features, including YAML config, Goldmark parser, and PDF renderer." />
+    <MESSAGE value="Remove outdated IHK guideline text and refactor PDF renderer for improved modularity, DIN 5008 compliance, and glossary/abbreviation support." />
+    <MESSAGE value="Remove outdated `toc_pages.txt`, add new Go modules for IHK Chemnitz PDF rendering including diagrams, tables, and TOC functionality." />
+    <option name="LAST_COMMIT_MESSAGE" value="Remove outdated `toc_pages.txt`, add new Go modules for IHK Chemnitz PDF rendering including diagrams, tables, and TOC functionality." />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>

markdown_parser.go

@@ -119,8 +119,8 @@ func RenderAST(doc ast.Node, content []byte, r *IHKRenderer) error {
 				}
 				// Fall through: render as plain code block on error
 			}
-			// Render non-diagram code blocks as monospace paragraphs
+			// Render as a numbered code block (gutter + monospace body).
-			r.RenderParagraphSpans([]InlineSpan{{Text: code, Code: true}})
+			r.RenderCodeBlock(lang, code)
 			return ast.WalkSkipChildren, nil
 
 		// ── Images ────────────────────────────────────────────────────────────

pdf_content.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/go-pdf/fpdf"
 )
@@ -89,13 +90,28 @@ func (r *IHKRenderer) RenderListItem(spans []InlineSpan, ordered bool, index, in
 	r.pdf.SetFont("Helvetica", "", dinFontBody)
 
 	lm, _, _, _ := r.pdf.GetMargins()
-	indentMM := float64(indent+1) * 8.0
+
-	r.pdf.SetX(lm + indentMM)
+	// 3 mm base indent + 5 mm per nesting level (reduced from previous 8 mm per level)
+	indentMM := 3.0 + float64(indent)*5.0
 
 	prefix := "• "
 	if ordered {
 		prefix = strconv.Itoa(index) + ". "
 	}
+	prefixW := r.pdf.GetStringWidth(prefix) + 1.0
+
+	// textX is where the item text starts; wrapped lines must align here too.
+	textX := lm + indentMM + prefixW
+	textW := r.usableWidth() - indentMM - prefixW
+
+	// Temporarily move the left margin to textX so that MultiCell wraps
+	// continuation lines flush with the text, not back to the page margin.
+	r.pdf.SetLeftMargin(textX)
+	defer r.pdf.SetLeftMargin(lm)
+
+	// Render bullet/number; CellFormat advances X to textX automatically.
+	r.pdf.SetX(lm + indentMM)
+	r.pdf.CellFormat(prefixW, dinLineHtBody, r.tr(prefix), "", 0, "L", false, 0, "")
 
 	hasFormatting := false
 	for _, s := range spans {
@@ -105,15 +121,13 @@ func (r *IHKRenderer) RenderListItem(spans []InlineSpan, ordered bool, index, in
 		}
 	}
 
-	uw := r.usableWidth() - indentMM
 	if !hasFormatting {
-		text := prefix
+		text := ""
 		for _, s := range spans {
 			text += s.Text
 		}
-		r.pdf.MultiCell(uw, dinLineHtBody, r.tr(text), "", "L", false)
+		r.pdf.MultiCell(textW, dinLineHtBody, r.tr(text), "", "L", false)
 	} else {
-		r.pdf.Write(dinLineHtBody, r.tr(prefix))
 		for _, span := range spans {
 			style := fontStyle(span.Bold, span.Italic)
 			if span.Code {
@@ -254,6 +268,72 @@ func (r *IHKRenderer) RenderImage(path string, caption string) {
 	r.pdf.Ln(dinSpaceAfterParagraph)
 }
 
+// Code block layout constants.
+const (
+	codeFont    = 9.0  // pt — Courier, smaller than body text
+	codeLineHt  = 4.5  // mm ≈ 9 pt × 1.3 line spacing
+	codeGutterW = 11.0 // mm — column reserved for line numbers
+)
+
+// RenderCodeBlock renders a fenced code block with a line-number gutter.
+//
+// Layout:
+//
+//	┌──────┬──────────────────────────────────┐
+//	│   1  │  package main                    │
+//	│   2  │                                  │
+//	│   3  │  func main() { … }               │
+//	└──────┴──────────────────────────────────┘
+//
+// The language label is shown in small italic text above the block.
+// Lines that exceed the printable width are clipped — code should be
+// formatted to reasonable lengths before conversion.
+func (r *IHKRenderer) RenderCodeBlock(lang, code string) {
+	lines := strings.Split(strings.TrimRight(code, "\n"), "\n")
+	if len(lines) == 0 {
+		return
+	}
+
+	r.pdf.Ln(dinSpaceAfterParagraph)
+
+	// Language label — top-right, italic, grey
+	if lang != "" {
+		r.pdf.SetFont("Helvetica", "I", dinFontCaption)
+		r.pdf.SetTextColor(100, 100, 100)
+		r.pdf.CellFormat(0, dinLineHtCaption, r.tr(lang), "", 1, "R", false, 0, "")
+		r.pdf.SetTextColor(0, 0, 0)
+	}
+
+	lm, _, _, bm := r.pdf.GetMargins()
+	_, pageH := r.pdf.GetPageSize()
+	uw := r.usableWidth()
+	codeW := uw - codeGutterW
+
+	r.pdf.SetFont("Courier", "", codeFont)
+
+	for i, line := range lines {
+		// Start a new page if this line would fall below the bottom margin.
+		if r.pdf.GetY()+codeLineHt > pageH-bm {
+			r.pdf.AddPage()
+		}
+
+		// Gutter: darker grey, right-aligned line number.
+		r.pdf.SetFillColor(218, 218, 218)
+		r.pdf.SetX(lm)
+		r.pdf.CellFormat(codeGutterW, codeLineHt,
+			fmt.Sprintf("%4d  ", i+1), "", 0, "R", true, 0, "")
+
+		// Code line: lighter grey, left-aligned, small leading space.
+		r.pdf.SetFillColor(246, 246, 246)
+		r.pdf.CellFormat(codeW, codeLineHt,
+			r.tr(" "+line), "", 1, "L", true, 0, "")
+	}
+
+	// Reset colours so subsequent content is unaffected.
+	r.pdf.SetFillColor(255, 255, 255)
+	r.pdf.Ln(dinSpaceAfterParagraph)
+}
+
 // fontStyle returns the fpdf font style string for a given bold/italic combination.
 func fontStyle(bold, italic bool) string {
 	switch {

report.md

@@ -48,7 +48,7 @@ manuelle Sorgfalt bei jedem Absatz.
 Ziel ist ein Go-Tool, das **Markdown** in PDF umwandelt und dabei alle
 formalen Anforderungen der IHK Chemnitz erfüllt. Es soll:
 
-- die Prüfungsvorbereitung erleichtern,
+- die Prüfungsvorbereitung erleichtern, die Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen unddie Qualität der Dokumente *einheitlich* sicherstellen und
 - die Qualität der Dokumente *einheitlich* sicherstellen und
 - den Prozess vollständig automatisieren.