interhg extension allows you to change changelog text like InterWiki.

hgext/interhg.py

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+# interhg.py - interhg
+#
+# Copyright 2007 OHASHI Hideya <[e-mail]>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+#
+# The `interhg' Mercurial extension allows you to change changelog and
+# summary text just like InterWiki way.
+#
+# To enable this extension:
+#
+#   [extensions]
+#   interhg =
+#
+# This is an example to link to a bug tracking system.
+#
+#   [interhg]
+#   pat1 = s/issue(\d+)/ <a href="http:\/\/bts\/issue\1">issue\1<\/a> /
+#
+# You can add patterns to use pat2, pat3, ...
+# For exapmle.
+#
+#   pat2 = s/(^|\s)#(\d+)\b/ <b>#\2<\/b> /
+
+import re
+from mercurial.hgweb import hgweb_mod
+from mercurial import templater
+
+orig_escape = templater.common_filters["escape"]
+
+interhg_table = []
+
+def interhg_escape(x):
+    escstr = orig_escape(x)
+    for pat in interhg_table:
+        regexp = pat[0]
+        format = pat[1]
+        escstr = regexp.sub(format, escstr)
+    return escstr
+
+templater.common_filters["escape"] = interhg_escape
+
+orig_refresh = hgweb_mod.hgweb.refresh
+
+def interhg_refresh(self):
+    interhg_table[:] = []
+    num = 1
+    while True:
+        key = 'pat%d' % num
+        pat = self.config('interhg', key)
+        if pat == None:
+            break
+        pat = pat[2:-1]
+        span = re.search(r'[^\\]/', pat).span()
+        regexp = pat[:span[0] + 1]
+        format = pat[span[1]:]
+        format = re.sub(r'\\/', '/', format)
+        regexp = re.compile(regexp)
+        interhg_table.append((regexp, format))
+        num += 1
+    return orig_refresh(self)
+
+hgweb_mod.hgweb.refresh = interhg_refresh