hgit rev-list support

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hgit rev-list support

From: Chris Mason <[e-mail]>

Update hgit rev-list support, make it a special case of hgit rev-tree

Print newest commit first
Add the ability to specify the max number of commits to print (-n or --max-nr=)
Match git feature of stopping at a given commit (hgit rev-list start_commit sto\p_commit)

manifest hash: b9bbd5e95dae771ebef89f8f4102e458052b1835
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contrib/hgit

@@ -128,7 +128,7 b' def catfile(args, ui, repo):'
 # telling you which commits are reachable from the supplied ones via
 # a bitmask based on arg position.
 # you can specify a commit to stop at by starting the sha1 with ^
-def revtree(args, repo):
+def revtree(args, repo, full="tree", maxnr=0):
     # calculate and return the reachability bitmask for sha
     def is_reachable(ar, reachable, sha):
         if len(ar) == 0:
@@ -143,6 +143,7 b' def revtree(args, repo):'
     reachable = []
     stop_sha1 = []
     want_sha1 = []
+    count = 0
 
     # figure out which commits they are asking for and which ones they
     # want us to stop on
@@ -153,6 +154,7 b' def revtree(args, repo):'
             want_sha1.append(s)
         elif args[i] != 'HEAD':
             want_sha1.append(args[i])
+
     # calculate the graph for the supplied commits
     for i in range(len(want_sha1)):
         reachable.append({});
@@ -169,12 +171,19 b' def revtree(args, repo):'
                     visit.append(p)
                 if p in stop_sha1:
                     break
+
     # walk the repository looking for commits that are in our
     # reachability graph
-    for i in range(repo.changelog.count()):
+    for i in range(repo.changelog.count()-1, -1, -1):
         n = repo.changelog.node(i)
         mask = is_reachable(want_sha1, reachable, n)
         if mask:
+            if not full:
+                print hg.hex(n)
+            elif full is "commit":
+                print hg.hex(n)
+                catcommit(repo, n, '  ')
+            else:
             changes = repo.changelog.read(n)
             (p1, p2) = repo.changelog.parents(n)
             (h, h1, h2) = map(hg.hex, (n, p1, p2))
@@ -189,20 +198,26 b' def revtree(args, repo):'
             if i2 != -1 and mask > 0:
                 print "%s:%s " % (h2, mask),
             print ""
+            if maxnr and count >= maxnr:
+                break
+            count += 1
 
 # git rev-list tries to order things by date, and has the ability to stop
 # at a given commit without walking the whole repo.  TODO add the stop
 # parameter
 def revlist(args, repo):
     doptions = {}
-    opts = [('c', 'commit', None, 'commit')]
+    opts = [('c', 'commit', None, 'commit'),
+            ('n', 'max-nr', 0, 'max-nr')]
     args = fancyopts.fancyopts(args, opts, doptions,
                                'hg rev-list')
-    for i in range(repo.changelog.count()):
-        n = repo.changelog.node(i)
-        print hg.hex(n)
         if doptions['commit']:
-            catcommit(repo, n, '  ')
+        full = "commit"
+    else:
+        full = None
+    for i in range(1, len(args)):
+        args[i] = '^' + args[i]
+    revtree(args, repo, full, doptions['max-nr'])
 
 def catchterm(*args):
     raise SignalInterrupt