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-rw-r--r--Documentation/git-log.txt54
1 files changed, 50 insertions, 4 deletions
diff --git a/Documentation/git-log.txt b/Documentation/git-log.txt
index 20e6d21a74..2b8ac5ff88 100644
--- a/Documentation/git-log.txt
+++ b/Documentation/git-log.txt
@@ -15,9 +15,12 @@ DESCRIPTION
-----------
Shows the commit logs.
-The command takes options applicable to the `git rev-list`
+:git-log: 1
+include::rev-list-description.txt[]
+
+The command takes options applicable to the linkgit:git-rev-list[1]
command to control what is shown and how, and options applicable to
-the `git diff-*` commands to control how the changes
+the linkgit:git-diff[1] command to control how the changes
each commit introduces are shown.
@@ -111,8 +114,51 @@ include::rev-list-options.txt[]
include::pretty-formats.txt[]
-COMMON DIFF OPTIONS
--------------------
+DIFF FORMATTING
+---------------
+
+By default, `git log` does not generate any diff output. The options
+below can be used to show the changes made by each commit.
+
+Note that unless one of `-c`, `--cc`, or `-m` is given, merge commits
+will never show a diff, even if a diff format like `--patch` is
+selected, nor will they match search options like `-S`. The exception is
+when `--first-parent` is in use, in which merges are treated like normal
+single-parent commits (this can be overridden by providing a
+combined-diff option or with `--no-diff-merges`).
+
+-c::
+ With this option, diff output for a merge commit
+ shows the differences from each of the parents to the merge result
+ simultaneously instead of showing pairwise diff between a parent
+ and the result one at a time. Furthermore, it lists only files
+ which were modified from all parents.
+
+--cc::
+ This flag implies the `-c` option and further compresses the
+ patch output by omitting uninteresting hunks whose contents in
+ the parents have only two variants and the merge result picks
+ one of them without modification.
+
+--combined-all-paths::
+ This flag causes combined diffs (used for merge commits) to
+ list the name of the file from all parents. It thus only has
+ effect when -c or --cc are specified, and is likely only
+ useful if filename changes are detected (i.e. when either
+ rename or copy detection have been requested).
+
+-m::
+ This flag makes the merge commits show the full diff like
+ regular commits; for each merge parent, a separate log entry
+ and diff is generated. An exception is that only diff against
+ the first parent is shown when `--first-parent` option is given;
+ in that case, the output represents the changes the merge
+ brought _into_ the then-current branch.
+
+--diff-merges=off::
+--no-diff-merges::
+ Disable output of diffs for merge commits (default). Useful to
+ override `-m`, `-c`, or `--cc`.
:git-log: 1
include::diff-options.txt[]