post-checkout hook, tests, and docs

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 019a39f2bf7253f3938d87a21a5467e37e33a2e0..228ccaf10ab6bf7e4a3909d31ac31afbd2361d8c 100644 (file)
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -4,6 +4,13 @@
 -u::
        Synonym for "-p".
 
+-U<n>::
+       Shorthand for "--unified=<n>".
+
+--unified=<n>::
+       Generate diffs with <n> lines of context instead of
+       the usual three. Implies "-p".
+
 --raw::
        Generate the raw format.
 
@@ -36,7 +43,9 @@
        Synonym for "-p --stat".
 
 -z::
-       \0 line termination on output
+       NUL-line termination on output.  This affects the --raw
+       output field terminator.  Also output from commands such
+       as "git-log" will be delimited with NUL between commits.
 
 --name-only::
        Show only names of changed files.
@@ -86,7 +95,7 @@
        Detect renames.
 
 -C::
-       Detect copies as well as renames.
+       Detect copies as well as renames.  See also `--find-copies-harder`.
 
 --diff-filter=[ACDMRTUXB*]::
        Select only files that are Added (`A`), Copied (`C`),
@@ -100,12 +109,13 @@
        that matches other criteria, nothing is selected.
 
 --find-copies-harder::
-       For performance reasons, by default, -C option finds copies only 
-       if the original file of the copy was modified in the same 
+       For performance reasons, by default, `-C` option finds copies only
+       if the original file of the copy was modified in the same
        changeset.  This flag makes the command
        inspect unmodified files as candidates for the source of
        copy.  This is a very expensive operation for large
-       projects, so use it with caution.
+       projects, so use it with caution.  Giving more than one
+       `-C` option has the same effect.
 
 -l<num>::
        -M and -C options require O(n^2) processing time where n
@@ -140,6 +150,9 @@
 -a::
        Shorthand for "--text".
 
+--ignore-space-at-eol::
+       Ignore changes in white spaces at EOL.
+
 --ignore-space-change::
        Ignore changes in amount of white space.  This ignores white
        space at line end, and consider all other sequences of one or
@@ -156,5 +169,21 @@
 -w::
        Shorthand for "--ignore-all-space".
 
+--exit-code::
+       Make the program exit with codes similar to diff(1).
+       That is, it exits with 1 if there were differences and
+       0 means no differences.
+
+--quiet::
+       Disable all output of the program. Implies --exit-code.
+
+--ext-diff::
+       Allow an external diff helper to be executed. If you set an
+       external diff driver with gitlink:gitattributes(5), you need
+       to use this option with gitlink:git-log(1) and friends.
+
+--no-ext-diff::
+       Disallow external diff drivers.
+
 For more detailed explanation on these common options, see also
 link:diffcore.html[diffcore documentation].