Add txt2tags-to-Markdown conversion

CHANGELOG.md

@@ -1,3 +1,4 @@
+* Format entries with Markdown, rendered by markdown-it-py. Legacy txt2tags entries are converted to Markdown automatically, the editor highlights Markdown syntax, and the format/insert buttons now insert Markdown (@jendrikseipp).
 * Fix segfault on Wayland when setting the window icon (#806, @sjg20)
 
 # 2.42 (2025-12-28)

README.md

@@ -18,6 +18,7 @@ Needed for running RedNotebook:
   * GtkSourceView (3.0+): https://wiki.gnome.org/Projects/GtkSourceView
   * Python (3.8+): https://www.python.org
   * PyYAML (3.10+): https://pyyaml.org
+  * markdown-it-py, mdit-py-plugins and linkify-it-py: https://github.com/executablebooks/markdown-it-py
   * WebKitGTK (2.16+): https://webkitgtk.org (only on Linux and macOS)
   * PyEnchant for spell checking (1.6+): https://pypi.org/project/pyenchant/ (optional)
 

debian/control

@@ -27,6 +27,9 @@ Depends: ${python3:Depends},
          gir1.2-pango-1.0,
          gir1.2-webkit2-4.1 | gir1.2-webkit2-4.0,
          python3-gi,
+         python3-linkify-it,
+         python3-markdown-it,
+         python3-mdit-py-plugins,
          python3-yaml
 Recommends: python3-enchant
 Description: Modern desktop diary and personal journaling tool

dev/whitelist.py

@@ -51,3 +51,37 @@ def __getattr__(self, _):
 Dummy().error_par
 Dummy().goodbye_par
 Dummy().example_entry
+
+# markdownmarkup renderer methods are dispatched dynamically by token type.
+Dummy().blockquote_close
+Dummy().blockquote_open
+Dummy().bullet_list_close
+Dummy().bullet_list_open
+Dummy().code_block
+Dummy().code_inline
+Dummy().em_close
+Dummy().em_open
+Dummy().hardbreak
+Dummy().heading_close
+Dummy().heading_open
+Dummy().hr
+Dummy().html_block
+Dummy().html_inline
+Dummy().link_close
+Dummy().link_open
+Dummy().list_item_close
+Dummy().list_item_open
+Dummy().math_block
+Dummy().math_inline
+Dummy().ordered_list_close
+Dummy().ordered_list_open
+Dummy().paragraph_close
+Dummy().paragraph_open
+Dummy().rn_color
+Dummy().s_close
+Dummy().s_open
+Dummy().softbreak
+Dummy().strong_close
+Dummy().strong_open
+Dummy().th_close
+Dummy().tr_close

rednotebook/data.py

@@ -41,11 +41,11 @@
 and add them to the 'Tags' section on the left panel.
 
 This pattern DOES NOT control the styling of hashtags in the text.
-To control this behaviour refer to rednotebook/files/t2t.lang
+To control this behaviour refer to rednotebook/files/markdown.lang
 (regexes) and rednotebook/files/rednotebook-highlight-style.xml (styles).
 
 If you make changes to this pattern, is very likely you will have to
-make changes to /rednotebook/files/t2t.lang
+make changes to /rednotebook/files/markdown.lang
 """
 HASHTAG = re.compile(HASHTAG_PATTERN, flags=re.IGNORECASE)