Merge pull request 'feature/table-of-content-docx' (#2) from jonathan/cpolis:feature/table-of-content-docx into devel

Reviewed-on: #2

cmd/backend/create_toc.lua

@@ -0,0 +1,36 @@
+
+-- Helper function: remove all image inlines from a list of inlines.
+local function remove_images(inlines)
+  local result = {}
+  for _, item in ipairs(inlines) do
+    if item.t ~= "Image" then
+      table.insert(result, item)
+    end
+  end
+  return result
+end
+
+-- Build a bullet list representing the table of contents.
+local function build_toc(doc)
+  local toc_items = {}
+  for _, block in ipairs(doc.blocks) do
+    if block.t == "Header" then
+      local clean_inlines = remove_images(block.content)
+      local header_text = pandoc.utils.stringify(clean_inlines)
+      if header_text ~= "" then
+        local link = pandoc.Link(clean_inlines, "#" .. block.identifier)
+        table.insert(toc_items, { link })
+      end
+    end
+  end
+  return pandoc.BulletList(toc_items)
+end
+
+-- The Pandoc function runs after the document is fully constructed.
+function Pandoc(doc)
+  local toc = build_toc(doc)
+  -- Insert the TOC at the very beginning of the document.
+  table.insert(doc.blocks, 1, toc)
+  return doc
+end
+

cmd/backend/docx.go

@@ -20,8 +20,9 @@ func ConvertToMarkdown(c *Config, filename string) ([]byte, error) {
 	}
 	defer os.RemoveAll(tmpDir)
 
+	// --toc
 	articleFileName := filepath.Join(os.TempDir(), fmt.Sprint(uuid.New(), ".md"))
-	cmd := exec.Command("pandoc", "-s", "-f", "docx", "-t", "commonmark_x", "-o", articleFileName, "--extract-media", tmpDir, filename) // TODO: Is writing to a file necessary?
+	cmd := exec.Command("pandoc", "-s", "--lua-filter=cmd/backend/create_toc.lua", "-f", "docx", "-t", "commonmark_x", "-o", articleFileName, "--extract-media", tmpDir, filename) // TODO: Is writing to a file necessary?
 	cmd.Stderr = &stderr
 	if err = cmd.Run(); err != nil {
 		return nil, fmt.Errorf("error converting docx to markdown: %v: %v", err, stderr.String())
@@ -33,6 +34,9 @@ func ConvertToMarkdown(c *Config, filename string) ([]byte, error) {
 		return nil, fmt.Errorf("error reading markdown file: %v", err)
 	}
 
+	re := regexp.MustCompile(`\{width=[^}]+height=[^}]+\}`)
+	articleContent = re.ReplaceAll(articleContent, []byte(""))
+
 	imageNames, err := filepath.Glob(filepath.Join(tmpDir, "media", "*"))
 	if err != nil {
 		return nil, fmt.Errorf("error getting docx images from temporary directory: %v", err)