Add Typogrify dash config

docs/settings.rst

@@ -264,6 +264,16 @@ Basic settings
    ``pre`` and ``code`` tags. This requires that Typogrify version 2.0.4 or
    later is installed
 
+.. data:: TYPOGRIFY_DASHES = 'default'
+
+   How should Typogrify set up the smartypants filter to interpret multiple
+   hyphen-minus characters? A single ASCII hyphen-minus characters is always
+   rendered as a hyphen. By ``default`` only em-dashes would be generated, by
+   typing double hyphens. The ``oldschool``-style would cause both en-dashes
+   and em-dashes to be rendered, by typing 2 and 3 hyphen-minus characters,
+   respectively. The ``oldschool_inverted`` setting causes them to be
+   interpreted the other way around.
+
 .. data:: SUMMARY_MAX_LENGTH = 50
 
    When creating a short summary of an article, this will be the default length

pelican/readers.py

@@ -604,6 +604,12 @@ class Readers(FileStampDataCacher):
             from typogrify.filters import typogrify
             import smartypants
 
+            typogrify_dashes = self.settings['TYPOGRIFY_DASHES']
+            if typogrify_dashes == 'oldschool':
+                smartypants.Attr.default = smartypants.Attr.set2
+            elif typogrify_dashes == 'oldschool_inverted':
+                smartypants.Attr.default = smartypants.Attr.set3
+
             # Tell `smartypants` to also replace " HTML entities with
             # smart quotes. This is necessary because Docutils has already
             # replaced double quotes with said entities by the time we run

pelican/settings.py

@@ -142,6 +142,7 @@ DEFAULT_CONFIG = {
     'ARTICLE_PERMALINK_STRUCTURE': '',
     'TYPOGRIFY': False,
     'TYPOGRIFY_IGNORE_TAGS': [],
+    'TYPOGRIFY_DASHES': 'default',
     'SUMMARY_MAX_LENGTH': 50,
     'PLUGIN_PATHS': [],
     'PLUGINS': [],