`summary`
	does. The `diff` format shows an inline diff of the changed
	contents of the submodule. Defaults to `short`.

`diff.wordRegex`::
	A POSIX Extended Regular Expression used to determine what is a "word"
	when performing word-by-word difference calculations.  Character
	sequences that match the regular expression are "words", all other
	characters are *ignorable* whitespace.

`diff.<driver>.command`::
	The custom diff driver command.  See linkgit:gitattributes[5]
	for details.

`diff.<driver>.trustExitCode`::
	If this boolean value is set to `true` then the
	`diff.<driver>.command` command is expected to return exit code
	0 if it considers the input files to be equal or 1 if it
	considers them to be different, like `diff`(1).
	If it is set to `false`, which is the default, then the command
	is expected to return exit code 0 regardless of equality.
	Any other exit code causes Git to report a fatal error.

`diff.<driver>.xfuncname`::
	The regular expression that the diff driver should use to
	recognize the hunk header.  A built-in pattern may also be used.
	See linkgit:gitattributes[5] for details.

`diff.<driver>.binary`::
	Set this option to `true` to make the diff driver treat files as
	binary.  See linkgit:gitattributes[5] for details.

`diff.<driver>.textconv`::
	The command that the diff driver should call to generate the
	text-converted version of a file.  The result of the
	conversion is used to generate a human-readable diff.  See
	linkgit:gitattributes[5] for details.

`diff.<driver>.wordRegex`::
	The regular expression that the diff driver should use to
	split words in a line.  See linkgit:gitattributes[5] for
	details.

`diff.<driver>.cachetextconv`::
	Set this option to `true` to make the diff driver cache the text
	conversion outputs.  See linkgit:gitattributes[5] for details.

`diff.indentHeuristic`::
	Set this option to `false` to disable the default heuristics
	that shift diff hunk boundaries to make patches easier to read.

`diff.algorithm`::
	Choose a diff algorithm.  The variants are as follows:
+
--
`default`;;
`myers`;;
	The basic greedy diff algorithm. Currently, this is the default.
`minimal`;;
	Spend extra time to make sure the smallest possible diff is
	produced.
`patience`;;
	Use "patience diff" algorithm when generating patches.
`histogram`;;
	This algorithm extends the patience algorithm to "support
	low-occurrence common elements".
--
+

`diff.wsErrorHighlight`::
	Highlight whitespace errors in the `context`, `old` or `new`
	lines of the diff.  Multiple values are separated by comma,
	`none` resets previous values, `default` reset the list to
	`new` and `all` is a shorthand for `old,new,context`.  The
	whitespace errors are colored with `color.diff.whitespace`.
	The command line option `--ws-error-highlight=<kind>`
	overrides this setting.

`diff.colorMoved`::
	If set to either a valid _<mode>_ or a `true` value, moved lines
	in a diff are colored differently.
ifdef::git-diff[]
	For details of valid modes see `--color-moved`.
endif::git-diff[]
ifndef::git-diff[]
	For details of valid modes see `--color-moved` in linkgit:git-diff[1].
endif::git-diff[]
	If simply set to `true` the default color mode will be used. When
	set to `false`, moved lines are not colored.

`diff.colorMovedWS`::
	When moved lines are colored using e.g. the `diff.colorMoved` setting,
	this option controls the mode how spaces are treated.
	For details of valid modes see `--color-moved-ws` in linkgit:git-diff[1].