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index 3aa38097e6350a02c50873d5c670e108003fab22..735cf07b20e17e29d96f701d97768ae610aea590 100644 (file)
--parents::
--parents::
- Print the parents of the commit.
+ Print the parents of the commit. Also enables parent
+ rewriting, see 'History Simplification' below.
--children::
--children::
- Print the children of the commit.
+ Print the children of the commit. Also enables parent
+ rewriting, see 'History Simplification' below.
ifdef::git-rev-list[]
--timestamp::
ifdef::git-rev-list[]
--timestamp::
o---x---a---a branch A
-----------------------------------------------------------------------
+
o---x---a---a branch A
-----------------------------------------------------------------------
+
-you would get an output line this:
+you would get an output like this:
+
-----------------------------------------------------------------------
$ git rev-list --left-right --boundary --pretty=oneline A...B
+
-----------------------------------------------------------------------
$ git rev-list --left-right --boundary --pretty=oneline A...B
This implies the '--topo-order' option by default, but the
'--date-order' option may also be specified.
This implies the '--topo-order' option by default, but the
'--date-order' option may also be specified.
+ifndef::git-rev-list[]
Diff Formatting
~~~~~~~~~~~~~~~
Diff Formatting
~~~~~~~~~~~~~~~
-t::
Show the tree objects in the diff output. This implies '-r'.
-t::
Show the tree objects in the diff output. This implies '-r'.
+endif::git-rev-list[]
Commit Limiting
~~~~~~~~~~~~~~~
Commit Limiting
~~~~~~~~~~~~~~~
Stop when a given path disappears from the tree.
Stop when a given path disappears from the tree.
---full-history::
-
- Show also parts of history irrelevant to current state of a given
- path. This turns off history simplification, which removed merges
- which didn't change anything at all at some child. It will still actually
- simplify away merges that didn't change anything at all into either
- child.
-
--no-merges::
Do not print commits with more than one parent.
--no-merges::
Do not print commits with more than one parent.
this causes the output to have two extra lines of information
taken from the reflog. By default, 'commit@\{Nth}' notation is
used in the output. When the starting commit is specified as
this causes the output to have two extra lines of information
taken from the reflog. By default, 'commit@\{Nth}' notation is
used in the output. When the starting commit is specified as
-'commit@{now}', output also uses 'commit@\{timestamp}' notation
+'commit@\{now}', output also uses 'commit@\{timestamp}' notation
instead. Under '\--pretty=oneline', the commit message is
prefixed with this information on the same line.
instead. Under '\--pretty=oneline', the commit message is
prefixed with this information on the same line.
-
-Cannot be combined with '\--reverse'.
+This option cannot be combined with '\--reverse'.
See also linkgit:git-reflog[1].
--merge::
See also linkgit:git-reflog[1].
--merge::
Output uninteresting commits at the boundary, which are usually
not shown.
Output uninteresting commits at the boundary, which are usually
not shown.
+--
+
+History Simplification
+~~~~~~~~~~~~~~~~~~~~~~
+
+When optional paths are given, 'git-rev-list' simplifies commits with
+various strategies, according to the options you have selected.
+
+Suppose you specified `foo` as the <paths>. We shall call commits
+that modify `foo` !TREESAME, and the rest TREESAME. (In a diff
+filtered for `foo`, they look different and equal, respectively.)
+
+In the following, we will always refer to the same example history to
+illustrate the differences between simplification settings. We assume
+that you are filtering for a file `foo` in this commit graph:
+-----------------------------------------------------------------------
+ .-A---M---N---O---P
+ / / / / /
+ I B C D E
+ \ / / / /
+ `-------------'
+-----------------------------------------------------------------------
+The horizontal line of history A--P is taken to be the first parent of
+each merge. The commits are:
+
+* `I` is the initial commit, in which `foo` exists with contents
+ "asdf", and a file `quux` exists with contents "quux". Initial
+ commits are compared to an empty tree, so `I` is !TREESAME.
+
+* In `A`, `foo` contains just "foo".
+
+* `B` contains the same change as `A`. Its merge `M` is trivial and
+ hence TREESAME to all parents.
+
+* `C` does not change `foo`, but its merge `N` changes it to "foobar",
+ so it is not TREESAME to any parent.
+
+* `D` sets `foo` to "baz". Its merge `O` combines the strings from
+ `N` and `D` to "foobarbaz"; i.e., it is not TREESAME to any parent.
+
+* `E` changes `quux` to "xyzzy", and its merge `P` combines the
+ strings to "quux xyzzy". Despite appearing interesting, `P` is
+ TREESAME to all parents.
+
+'rev-list' walks backwards through history, including or excluding
+commits based on whether '\--full-history' and/or parent rewriting
+(via '\--parents' or '\--children') are used. The following settings
+are available.
+
+Default mode::
+
+ Commits are included if they are not TREESAME to any parent
+ (though this can be changed, see '\--sparse' below). If the
+ commit was a merge, and it was TREESAME to one parent, follow
+ only that parent. (Even if there are several TREESAME
+ parents, follow only one of them.) Otherwise, follow all
+ parents.
++
+This results in:
++
+-----------------------------------------------------------------------
+ .-A---N---O
+ / /
+ I---------D
+-----------------------------------------------------------------------
++
+Note how the rule to only follow the TREESAME parent, if one is
+available, removed `B` from consideration entirely. `C` was
+considered via `N`, but is TREESAME. Root commits are compared to an
+empty tree, so `I` is !TREESAME.
++
+Parent/child relations are only visible with --parents, but that does
+not affect the commits selected in default mode, so we have shown the
+parent lines.
+
+--full-history without parent rewriting::
+
+ This mode differs from the default in one point: always follow
+ all parents of a merge, even if it is TREESAME to one of them.
+ Even if more than one side of the merge has commits that are
+ included, this does not imply that the merge itself is! In
+ the example, we get
++
+-----------------------------------------------------------------------
+ I A B N D O
+-----------------------------------------------------------------------
++
+`P` and `M` were excluded because they are TREESAME to a parent. `E`,
+`C` and `B` were all walked, but only `B` was !TREESAME, so the others
+do not appear.
++
+Note that without parent rewriting, it is not really possible to talk
+about the parent/child relationships between the commits, so we show
+them disconnected.
+
+--full-history with parent rewriting::
+
+ Ordinary commits are only included if they are !TREESAME
+ (though this can be changed, see '\--sparse' below).
++
+Merges are always included. However, their parent list is rewritten:
+Along each parent, prune away commits that are not included
+themselves. This results in
++
+-----------------------------------------------------------------------
+ .-A---M---N---O---P
+ / / / / /
+ I B / D /
+ \ / / / /
+ `-------------'
+-----------------------------------------------------------------------
++
+Compare to '\--full-history' without rewriting above. Note that `E`
+was pruned away because it is TREESAME, but the parent list of P was
+rewritten to contain `E`'s parent `I`. The same happened for `C` and
+`N`. Note also that `P` was included despite being TREESAME.
+
+In addition to the above settings, you can change whether TREESAME
+affects inclusion:
+
--dense::
--dense::
+
+ Commits that are walked are included if they are not TREESAME
+ to any parent.
+
--sparse::
--sparse::
-When optional paths are given, the default behaviour ('--dense') is to
-only output commits that changes at least one of them, and also ignore
-merges that do not touch the given paths.
+ All commits that are walked are included.
++
+Note that without '\--full-history', this still simplifies merges: if
+one of the parents is TREESAME, we follow only that one, so the other
+sides of the merge are never walked.
-Use the '--sparse' flag to makes the command output all eligible commits
-(still subject to count and age limitation), but apply merge
-simplification nevertheless.
ifdef::git-rev-list[]
ifdef::git-rev-list[]
+Bisection Helpers
+~~~~~~~~~~~~~~~~~
+
--bisect::
Limit output to the one commit object which is roughly halfway between
--bisect::
Limit output to the one commit object which is roughly halfway between
`--bisect-vars` had been used alone.
endif::git-rev-list[]
`--bisect-vars` had been used alone.
endif::git-rev-list[]
---
Commit Ordering
~~~~~~~~~~~~~~~
Commit Ordering
~~~~~~~~~~~~~~~