2014-03-14: only write the bugslist and forks index files when they changed.

only write the bugslist and forks index files when they changed.

diff --git a/staticsite.py b/staticsite.py
--- a/staticsite.py
+++ b/staticsite.py
@@ -637,7 +637,7 @@ def contentequals(filepath, content):
     try: 
         with open(filepath) as f: 
             return f.read() == content
-    except OSError: return not content
+    except OSError: return not content # equal, if the content is empty
     except IOError: return False # file does not exist. Empty != not existing.
     # TODO: check: return True if content is None?
 
@@ -1134,9 +1134,11 @@ def writeforks(ui, repo, target, name):
         forkdir = getforkdir(target, forkname)
         if not os.path.isdir(os.path.join(target, forkdir)):
             os.makedirs(os.path.join(target, forkdir))
-        with open(os.path.join(target, forkdir, "index.html"), "w") as f:
-            f.write(
-                getforkdata(ui, repo, target, name, forkname, forkuri))
+        forkindex = os.path.join(target, forkdir, "index.html")
+        forkcontent = getforkdata(ui, repo, target, name, forkname, forkuri)
+        if not contentequals(forkindex, forkcontent):
+            with open(forkindex, "w") as f:
+                f.write(forkcontent)
 
 def writecommitsforchlist(ui, repo, target, name, chlist, force=False):
     """Write all not yet existing commit files."""
@@ -1202,10 +1204,12 @@ def writebugs(ui, repo, target, name):
     for bug in resolvedbugs:
         content += "<li><a href=\"" + bug.fullid + ".html\">" + bug.shortid + "</a> - " + htmlescape(bug.description) + "</li>\n"
     content += "</ul>\n"
-    with open(bugslist, "w") as f:
-        f.write(templates["head"].replace("{reponame}", "<a href='../'>"+name+"</a>").replace("{title}", name).replace("{nav}", "").replace("{relpath}", "../"))
-        f.write(content)
-        f.write(templates["foot"].replace("{reponame}", "<a href='../'>"+name+"</a>"))
+    html = templates["head"].replace("{reponame}", "<a href='../'>"+name+"</a>").replace("{title}", name).replace("{nav}", "").replace("{relpath}", "../")
+    html += content
+    html += templates["foot"].replace("{reponame}", "<a href='../'>"+name+"</a>")
+    if not contentequals(bugslist, html):
+        with open(bugslist, "w") as f:
+            f.write(html)
     # write all bug details
     for bug in openbugs + resolvedbugs:
         bugsfile = os.path.join(bugdir, bug.fullid + ".html")