initial somewhat working version of wiki links

github/github.py

@@ -5,6 +5,8 @@
 from trac.env import IEnvironmentSetupParticipant
 from trac.util.translation import _
 from trac.db import Table, Column, Index
+from trac.wiki import IWikiSyntaxProvider
+from genshi.builder import tag
 from hook import CommitHook
 
 import simplejson
@@ -13,7 +15,8 @@
 from git import Git
 
 class GithubPlugin(Component):
-    implements(IRequestHandler, IRequestFilter, IEnvironmentSetupParticipant)
+    implements(IRequestHandler, IRequestFilter, IEnvironmentSetupParticipant,
+            IWikiSyntaxProvider)
 
 
     key           = Option('github', 'apitoken',      '', doc = """Your GitHub API Token found here: https://github.com/account, """)
@@ -92,6 +95,34 @@ def _upgrade_db(self, db):
 
         self.env.log.debug("inserted %d mappings into svn_revmap" % insert_count)
 
+    # IWikiSyntaxProvider methods
+    def get_wiki_syntax(self):
+        yield (r"r\d+",  #svn revision links ("r1432")
+            lambda formatter, ns, match:
+                self._format_changeset_link(formatter, 'svn', ns, match))
+        yield (r"[0-9a-fA-F]{5,40}", #git hashes ("eb390eca04394")
+            lambda formatter, ns, match:
+                self._format_changeset_link(formatter, 'git', ns, match))
+
+
+    #pre_process_request deals with link resolution
+    def get_link_resolvers(self):
+        return []
+
+    def _format_changeset_link(self, formatter, rev_type, ns, match):
+        self.env.log.debug("_format_changeset_link called")
+        self.env.log.debug("formatter is %s" % formatter)
+        self.env.log.debug("rev_type is %s" % rev_type)
+        self.env.log.debug("ns is %s" % ns)
+        self.env.log.debug("match is %s" % match)
+        git_hash = match.group(0)
+        if rev_type == 'svn':
+            svn_rev = match.group(0).replace('r','',1)
+            self.env.log.debug("found svn link; using revision %s" % svn_rev)
+            git_hash = self._get_git_hash(svn_rev)
+        if git_hash:
+            return tag.a(match.group(0), href="%s/%s" % (formatter.href.changeset(), git_hash), class_="fake_changeset")
+        return match.group(0)
 
     # IRequestHandler methods
     def match_request(self, req):