Move extlinks into the main Sage code

so ? does not require the documentation configuration to be present

src/doc/common/conf.py

@@ -1,6 +1,7 @@
 import sys, os, sphinx
 from sage.env import SAGE_DOC_SRC, SAGE_DOC, SAGE_SRC, THEBE_DIR, SAGE_SHARE
 import sage.version
+from sage.misc.sagedoc import extlinks
 import dateutil.parser
 from six import iteritems
 
@@ -149,21 +150,6 @@ def set_intersphinx_mappings(app):
             app.config.intersphinx_mapping[src] = dst
 
 
-pythonversion = sys.version.split(' ')[0]
-# Python and Sage trac ticket shortcuts. For example, :trac:`7549` .
-
-# Sage trac ticket shortcuts. For example, :trac:`7549` .
-extlinks = {
-    'python': ('https://docs.python.org/release/'+pythonversion+'/%s', ''),
-    'trac': ('https://trac.sagemath.org/%s', 'trac ticket #'),
-    'wikipedia': ('https://en.wikipedia.org/wiki/%s', 'Wikipedia article '),
-    'arxiv': ('https://arxiv.org/abs/%s', 'Arxiv '),
-    'oeis': ('https://oeis.org/%s', 'OEIS sequence '),
-    'doi': ('https://doi.org/%s', 'doi:'),
-    'pari': ('https://pari.math.u-bordeaux.fr/dochtml/help/%s', 'pari:'),
-    'mathscinet': ('https://www.ams.org/mathscinet-getitem?mr=%s', 'MathSciNet ')
-    }
-
 # By default document are not master.
 multidocs_is_master = True
 

src/sage/misc/sagedoc.py

@@ -461,6 +461,20 @@ def process_dollars(s):
             s = s[:m.start()] + "$" + s[m.end():]
     return s
 
+
+# Sage trac ticket shortcuts. For example, :trac:`7549` .
+pythonversion = sys.version.split(' ')[0]
+extlinks = {
+    'python': ('https://docs.python.org/release/'+pythonversion+'/%s', ''),
+    'trac': ('https://trac.sagemath.org/%s', 'trac ticket #'),
+    'wikipedia': ('https://en.wikipedia.org/wiki/%s', 'Wikipedia article '),
+    'arxiv': ('https://arxiv.org/abs/%s', 'Arxiv '),
+    'oeis': ('https://oeis.org/%s', 'OEIS sequence '),
+    'doi': ('https://doi.org/%s', 'doi:'),
+    'pari': ('https://pari.math.u-bordeaux.fr/dochtml/help/%s', 'pari:'),
+    'mathscinet': ('https://www.ams.org/mathscinet-getitem?mr=%s', 'MathSciNet ')
+}
+
 def process_extlinks(s, embedded=False):
     r"""nodetex
 
@@ -494,10 +508,6 @@ def process_extlinks(s, embedded=False):
     """
     if embedded:
         return s
-    oldpath = sys.path
-    sys.path = [os.path.join(SAGE_DOC_SRC, 'common')] + oldpath
-    from conf import extlinks
-    sys.path = oldpath
     for key in extlinks:
         while True:
             m = re.search(':%s:`([^`]*)`' % key, s)