DAMMIT

ox-md does not syntax-highlight source blocks, and trips over
definition lists.

2 files changed, 66 insertions, 4 deletions

diff --git a/repo/www/helpers.py b/repo/www/helpers.py
index dbab622..34f274f 100644
--- a/repo/www/helpers.py
+++ b/repo/www/helpers.py
@@ -3,7 +3,8 @@ from dataclasses import dataclass, field
 from itertools import chain
 from os import environ, path
 from pathlib import Path
-from subprocess import run
+from subprocess import CalledProcessError, run
+from tempfile import NamedTemporaryFile
 from typing import Dict, Iterator, Union
 
 
@@ -57,6 +58,42 @@ def deserialize_directories(directories):
     }
 
 
+class _NullPreprocessor:
+    def __init__(self, source_path):
+        self._source_path = source_path
+
+    def __enter__(self):
+        self.output = self._source_path
+        return self
+
+    def __exit__(self, *args):
+        pass
+
+class _OrgPreprocessor:
+    def __init__(self, source_path):
+        self._source_path = source_path
+
+    def __enter__(self):
+        self._output = NamedTemporaryFile(mode='w+', suffix='.md')
+        try:
+            run((
+                'emacs', '-Q', '--batch', '--load', 'preprocess-org.el',
+                '--eval', f'(preprocess-org "{self._source_path}")'
+            ), check=True, stdout=self._output)
+        except CalledProcessError:
+            self._output.close()
+            raise
+
+        self.output = self._output.name
+        return self
+
+    def __exit__(self, *args):
+        self._output.close()
+
+_PREPROCESSORS = defaultdict(lambda: _NullPreprocessor,
+                             (('org', _OrgPreprocessor),))
+
+
 _PathArg = Union[Path, str, bytes]
 
 @dataclass
@@ -69,8 +106,7 @@ class PandocRunner:
 
     def run(self, page, include_after=(), metadata=None):
         cmd = (
-            'pandoc', '-s', page, '-o', self.output,
-            '--template', self.template,
+            'pandoc', '-s', '-o', self.output, '--template', self.template,
             *chain(*(('--lua-filter', f) for f in self.filters)),
             *chain(*(('--css', s) for s in self.stylesheets)),
             *chain(*(('--include-after-body', f) for f in include_after))
@@ -85,7 +121,13 @@ class PandocRunner:
             ))
 
         environ['LUA_PATH'] = '.cache/?.lua;;'
-        run(cmd, check=True)
+
+        _, ext = path.splitext(page)
+        preprocessor = _PREPROCESSORS[ext[1:]]
+
+        with preprocessor(page) as preproc:
+            cmd = cmd + (preproc.output,)
+            run(cmd, check=True)
 
 
 def generate_crumbs(target):
diff --git a/repo/www/preprocess-org.el b/repo/www/preprocess-org.el
new file mode 100644
index 0000000..f7be936
--- /dev/null
+++ b/repo/www/preprocess-org.el
@@ -0,0 +1,20 @@
+(defun preprocess-org (input)
+  (with-temp-buffer
+    (insert-file-contents input)
+    (org-mode)
+    (while (re-search-forward org-heading-regexp nil t)
+      (save-excursion
+        (save-match-data
+          (when-let ((tags (org-get-tags (point))))
+            (insert "\n#+begin_tags\n")
+            (dolist (tag tags)
+              (insert "- " tag "\n"))
+            (insert "#+end_tags\n")))))
+  (let ((org-export-with-properties t)
+        (org-export-with-section-numbers nil)
+        (org-export-with-sub-superscripts '{})
+        (org-export-with-tags nil)
+        (org-export-with-title nil)
+        (org-export-with-toc nil))
+    (org-md-export-as-markdown))    
+  (princ (buffer-string))))