[PATCH 1 of 3 RFC v2] web: provide diffstat summary to the changeset page

[Steven Brown]

# HG changeset patch
# User Steven Brown <StevenGBrown at gmail.com>
# Date 1305809487 -28800
# Node ID de31c212265a9a89b67451e72dec11f2fb280968
# Parent  a75e0f4ba0ab91277b654416d93abd12aa50b940
web: provide diffstat summary to the changeset page

Add the diffstat keyword to the filenodelink template.

diff --git a/mercurial/hgweb/webcommands.py b/mercurial/hgweb/webcommands.py
--- a/mercurial/hgweb/webcommands.py
+++ b/mercurial/hgweb/webcommands.py
@@ -257,11 +257,13 @@
 
     files = []
     parity = paritygen(web.stripecount)
+    diffstats = webutil.diffstatfunc(web.repo, ctx)
     for f in ctx.files():
         template = f in ctx and 'filenodelink' or 'filenolink'
         files.append(tmpl(template,
                           node=ctx.hex(), file=f,
-                          parity=parity.next()))
+                          parity=parity.next(),
+                          diffstat=lambda **x: diffstats(x['file'])))
 
     parity = paritygen(web.stripecount)
     style = web.config('web', 'style', 'paper')
diff --git a/mercurial/hgweb/webutil.py b/mercurial/hgweb/webutil.py
--- a/mercurial/hgweb/webutil.py
+++ b/mercurial/hgweb/webutil.py
@@ -7,7 +7,7 @@
 # GNU General Public License version 2 or any later version.
 
 import os, copy
-from mercurial import match, patch, scmutil, error, ui
+from mercurial import match, patch, scmutil, error, ui, util
 from mercurial.node import hex, nullid
 
 def up(p):
@@ -211,6 +211,18 @@
     yield tmpl('diffblock', parity=parity.next(),
                lines=prettyprintlines(''.join(block)))
 
+def diffstatfunc(repo, ctx):
+    ''''Return a function that provides the diffstat histogram for a file.'''
+
+    hist = {}
+    def func(filename):
+        if not hist:
+            lines = util.iterlines(ctx.diff())
+            diffopts = patch.diffopts(repo.ui, untrusted=True)
+            hist.update(patch.diffstatdict(lines, git=diffopts.git))
+        return hist.get(filename)
+    return func
+
 class sessionvars(object):
     def __init__(self, vars, start='?'):
         self.start = start
diff --git a/mercurial/patch.py b/mercurial/patch.py
--- a/mercurial/patch.py
+++ b/mercurial/patch.py
@@ -1736,8 +1736,11 @@
         yield (filename, adds, removes, isbinary)
 
 def diffstat(lines, width=80, git=False):
+    stats = list(diffstatdata(lines))
+    return _diffstat(stats, width, git)
+
+def _diffstat(stats, width=80, git=False):
     output = []
-    stats = list(diffstatdata(lines))
 
     maxtotal, maxname = 0, 0
     totaladds, totalremoves = 0, 0
@@ -1805,3 +1808,13 @@
         else:
             yield (line, '')
         yield ('\n', '')
+
+def diffstatdict(lines, **kw):
+    '''Return a dictionary of file names to diffstat histograms.'''
+
+    stats = list(diffstatdata(lines))
+    hist = {}
+    for stat, line in zip(stats, _diffstat(stats, **kw).splitlines()):
+        filename = stat[0]
+        hist[filename] = line[1 + len(filename):].lstrip()[1:]
+    return hist