css start

cms.py

@@ -37,10 +37,12 @@ FOOTER_PAGE = "footer"  # Baustein: wird unter den Inhalt jeder Seite gesetzt
 
 # ---------------------------------------------------------------- markdown
 
-def md_to_html(text):
+def md_to_html(text, headings=None):
     """Minimaler Markdown->HTML-Konverter:
     Ueberschriften, **fett**, *kursiv*, `code`, [Links](url),
     Listen, Code-Bloecke, > Zitate, --- Trennlinien, Absaetze.
+    Ueberschriften bekommen id-Anker; in headings (Liste) werden
+    optional (anker, text) aller Ueberschriften gesammelt.
     """
     lines = text.replace("\r\n", "\n").split("\n")
     out = []
@@ -48,6 +50,7 @@ def md_to_html(text):
     in_code = False
     in_list = False
     list_tag = None
+    used_ids = {}
 
     def inline(s):
         s = re.sub(r"`([^`]+)`", r"<code>\1</code>", s)
@@ -89,11 +92,28 @@ def md_to_html(text):
             i += 1
             continue
 
+        # Rohe HTML-Zeilen (z.B. <div>, <svg>) unveraendert durchreichen
+        if stripped.startswith("<"):
+            close_list()
+            out.append(stripped)
+            i += 1
+            continue
+
         m = re.match(r"^(#{1,6})\s+(.*)$", stripped)
         if m:
             close_list()
             level = len(m.group(1))
-            out.append("<h%d>%s</h%d>" % (level, inline(_escape(m.group(2))), level))
+            text_h = m.group(2)
+            hid = _slugify(text_h)
+            if hid in used_ids:
+                used_ids[hid] += 1
+                hid = "%s-%d" % (hid, used_ids[hid])
+            else:
+                used_ids[hid] = 0
+            if headings is not None:
+                headings.append((hid, text_h))
+            out.append('<h%d id="%s">%s</h%d>'
+                       % (level, hid, inline(_escape(text_h)), level))
             i += 1
             continue
 
@@ -136,7 +156,7 @@ def md_to_html(text):
         close_list()
         para = [stripped]
         while (i + 1 < len(lines) and lines[i + 1].strip()
-               and not re.match(r"^(#{1,6}\s|[-*+]\s|\d+\.\s|>|```|-{3,}$)",
+               and not re.match(r"^(#{1,6}\s|[-*+]\s|\d+\.\s|>|```|-{3,}$|<)",
                                 lines[i + 1].strip())):
             i += 1
             para.append(lines[i].strip())
@@ -151,6 +171,23 @@ def _escape(s):
     return (s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;"))
 
 
+def _slugify(s):
+    """Ueberschriftentext -> HTML-id (ankertauglich, klein, ohne Sonderzeichen)."""
+    s = s.lower()
+    for k, v in (("ä", "ae"), ("ö", "oe"), ("ü", "ue"), ("ß", "ss")):
+        s = s.replace(k, v)
+    s = re.sub(r"[^a-z0-9]+", "-", s).strip("-")
+    return s or "abschnitt"
+
+
+def heading_nav(headings):
+    """Baut die Anker-Linkliste (Text-Links auf die Ueberschriften der Seite)."""
+    if not headings:
+        return ""
+    return "".join('<a href="#%s">%s</a>' % (hid, _escape(text))
+                   for hid, text in headings)
+
+
 # ------------------------------------------------------------------- seiten
 
 def parse_md(raw):
@@ -208,10 +245,18 @@ def block_html(slug):
 
 def render_page(raw, template, header_html="", footer_html=""):
     meta, body = parse_md(raw)
-    html = md_to_html(body)
+    headings = []
+    html = md_to_html(body, headings)
+    anker_html = heading_nav(headings)
     page = (template
             .replace("{{titel}}", _escape(meta.get("titel", "")))
             .replace("{{inhalt}}", html))
+    if "{{anker}}" in template:
+        page = page.replace("{{anker}}", anker_html)
+    elif anker_html and "{{header}}" in template:
+        # Template ohne {{anker}}-Platzhalter: Anker ans Ende des Headers
+        page = page.replace("{{header}}",
+                            header_html + '\n<nav class="anker-nav">' + anker_html + "</nav>")
     if "{{header}}" in template:
         page = page.replace("{{header}}", header_html)
     elif header_html and "<body>" in page: