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revisions.txt: fix and clarify <rev>^{<type>} 

If possible, <rev> will be dereferenced even if it is not a tag type
(e.g., commit dereferenced to a tree).

Signed-off-by: Richard Hansen <rhansen@bbn.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Richard Hansen 2013-09-04 15:04:33 -04:00 committed by Junio C Hamano
parent 930f302cdb
commit abdb54a1d2
1 changed files with 8 additions and 4 deletions
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12
Documentation/revisions.txt
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@ -111,10 +111,14 @@ some output processing may assume ref names in UTF-8.
'<rev>{caret}\{<type>\}', e.g. 'v0.99.8{caret}\{commit\}'::
A suffix '{caret}' followed by an object type name enclosed in
brace pair means the object
could be a tag, and dereference the tag recursively until an
object of that type is found or the object cannot be
dereferenced anymore (in which case, barf). '<rev>{caret}0'
brace pair means dereference the object at '<rev>' recursively until
an object of type '<type>' is found or the object cannot be
dereferenced anymore (in which case, barf).
For example, if '<rev>' is a commit-ish, '<rev>{caret}\{commit\}'
describes the corresponding commit object.
Similarly, if '<rev>' is a tree-ish, '<rev>{caret}\{tree\}'
describes the corresponding tree object.
'<rev>{caret}0'
is a short-hand for '<rev>{caret}\{commit\}'.
+
'rev{caret}\{object\}' can be used to make sure 'rev' names an