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patches/find-touching-from-seq.diff
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*** modified file 'bzrlib/commands.py'
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--- bzrlib/commands.py 
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+++ bzrlib/commands.py 
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@@ -610,11 +610,13 @@
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     hidden = True
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     takes_args = ["filename"]
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     def run(self, filename):
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+        from bzrlib.log import find_touching_revisions
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         b = Branch(filename, lock_mode='r')
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         inv = b.read_working_inventory()
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         file_id = inv.path2id(b.relpath(filename))
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-        for revno, revision_id, what in bzrlib.log.find_touching_revisions(b, file_id):
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-            print "%6d %s" % (revno, what)
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+        rh = b.revision_history()
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+        for revision_id, what in find_touching_revisions(b, file_id, rh):
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+            print "%-40s %s" % (revision_id, what)
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 class cmd_ls(Command):
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*** modified file 'bzrlib/log.py'
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--- bzrlib/log.py 
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+++ bzrlib/log.py 
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@@ -17,7 +17,7 @@
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-def find_touching_revisions(branch, file_id):
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+def find_touching_revisions(branch, file_id, revisions):
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     """Yield a description of revisions which affect the file_id.
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     Each returned element is (revno, revision_id, description)
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@@ -25,13 +25,20 @@
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     This is the list of revisions where the file is either added,
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     modified, renamed or deleted.
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-    TODO: Perhaps some way to limit this to only particular revisions,
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-    or to traverse a non-mainline set of revisions?
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+    branch
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+        Branch to examine
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+
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+    file_id
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+        File to consider
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+
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+    revisions
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+        Sequence of revisions to search, can be
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+        branch.revision_history() or a filtered version of that
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+        or some sequence of non-mailine revisions.
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     """
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     last_ie = None
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     last_path = None
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-    revno = 1
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-    for revision_id in branch.revision_history():
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+    for revision_id in revisions:
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         this_inv = branch.get_revision_inventory(revision_id)
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         if file_id in this_inv:
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             this_ie = this_inv[file_id]
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@@ -46,19 +53,19 @@
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             # not present in either
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             pass
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         elif this_ie and not last_ie:
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-            yield revno, revision_id, "added " + this_path
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+            yield revision_id, "added " + this_path
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         elif not this_ie and last_ie:
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             # deleted here
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-            yield revno, revision_id, "deleted " + last_path
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+            yield revision_id, "deleted " + last_path
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         elif this_path != last_path:
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-            yield revno, revision_id, ("renamed %s => %s" % (last_path, this_path))
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+            yield revision_id, ("renamed %s => %s" % (last_path, this_path))
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         elif (this_ie.text_size != last_ie.text_size
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               or this_ie.text_sha1 != last_ie.text_sha1):
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-            yield revno, revision_id, "modified " + this_path
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+            yield revision_id, "modified " + this_path
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         last_ie = this_ie
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         last_path = this_path
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-        revno += 1
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+
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 def show_log(branch,
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