Merge branch 'ew/diff'

* ew/diff:
  templates/hooks--update: replace diffstat calls with git diff --stat
  diff: do not use configuration magic at the core-level
  Update diff-options and config documentation.
  diff.c: --no-color to defeat diff.color configuration.
  diff.c: respect diff.renames config option

Documentation/config.txt

@@ -110,10 +110,31 @@ apply.whitespace::
 	Tells `git-apply` how to handle whitespaces, in the same way
 	as the '--whitespace' option. See gitlink:git-apply[1].
 
+diff.color::
+	When true (or `always`), always use colors in patch.
+	When false (or `never`), never.  When set to `auto`, use
+	colors only when the output is to the terminal.
+
+diff.color.<slot>::
+	Use customized color for diff colorization.  `<slot>`
+	specifies which part of the patch to use the specified
+	color, and is one of `plain` (context text), `meta`
+	(metainformation), `frag` (hunk header), `old` (removed
+	lines), or `new` (added lines).  The value for these
+	configuration variables can be one of: `normal`, `bold`,
+	`dim`, `ul`, `blink`, `reverse`, `reset`, `black`,
+	`red`, `green`, `yellow`, `blue`, `magenta`, `cyan`, or
+	`white`.
+
 diff.renameLimit::
 	The number of files to consider when performing the copy/rename
 	detection; equivalent to the git diff option '-l'.
 
+diff.renames::
+	Tells git to detect renames.  If set to any boolean value, it
+	will enable basic rename detection.  If set to "copies" or
+	"copy", it will detect copies, as well.
+
 format.headers::
 	Additional email headers to include in a patch to be submitted
 	by mail.  See gitlink:git-format-patch[1].

Documentation/diff-options.txt

@@ -4,18 +4,21 @@
 -u::
 	Synonym for "-p".
 
+--raw::
+	Generate the raw format.
+
 --patch-with-raw::
-	Generate patch but keep also the default raw diff output.
+	Synonym for "-p --raw".
 
 --stat::
-	Generate a diffstat instead of a patch.
+	Generate a diffstat.
 
 --summary::
 	Output a condensed summary of extended header information
 	such as creations, renames and mode changes.
 
 --patch-with-stat::
-	Generate patch and prepend its diffstat.
+	Synonym for "-p --stat".
 
 -z::
 	\0 line termination on output
@@ -26,10 +29,25 @@
 --name-status::
 	Show only names and status of changed files.
 
+--color::
+	Show colored diff.
+
+--no-color::
+	Turn off colored diff, even when the configuration file
+	gives the default to color output.
+
+--no-renames::
+	Turn off rename detection, even when the configuration
+	file gives the default to do so.
+
 --full-index::
 	Instead of the first handful characters, show full
 	object name of pre- and post-image blob on the "index"
-	line when generating a patch format output.	
+	line when generating a patch format output.
+
+--binary::
+	In addition to --full-index, output "binary diff" that
+	can be applied with "git apply".
 
 --abbrev[=<n>]::
 	Instead of showing the full 40-byte hexadecimal object

builtin-diff-files.c

@@ -18,7 +18,7 @@ int cmd_diff_files(int argc, const char **argv, char **envp)
 	struct rev_info rev;
 	int silent = 0;
 
-	git_config(git_diff_config);
+	git_config(git_default_config); /* no "diff" UI options */
 	init_revisions(&rev);
 	rev.abbrev = 0;
 

builtin-diff-index.c

@@ -15,7 +15,7 @@ int cmd_diff_index(int argc, const char **argv, char **envp)
 	int cached = 0;
 	int i;
 
-	git_config(git_diff_config);
+	git_config(git_default_config); /* no "diff" UI options */
 	init_revisions(&rev);
 	rev.abbrev = 0;
 

builtin-diff-stages.c

@@ -61,7 +61,7 @@ int cmd_diff_stages(int ac, const char **av, char **envp)
 	const char *prefix = setup_git_directory();
 	const char **pathspec = NULL;
 
-	git_config(git_diff_config);
+	git_config(git_default_config); /* no "diff" UI options */
 	read_cache();
 	diff_setup(&diff_options);
 	while (1 < ac && av[1][0] == '-') {

builtin-diff-tree.c

@@ -67,7 +67,7 @@ int cmd_diff_tree(int argc, const char **argv, char **envp)
 	static struct rev_info *opt = &log_tree_opt;
 	int read_stdin = 0;
 
-	git_config(git_diff_config);
+	git_config(git_default_config); /* no "diff" UI options */
 	nr_sha1 = 0;
 	init_revisions(opt);
 	opt->abbrev = 0;

builtin-diff.c

@@ -250,7 +250,7 @@ int cmd_diff(int argc, const char **argv, char **envp)
 	 * Other cases are errors.
 	 */
 
-	git_config(git_diff_config);
+	git_config(git_diff_ui_config);
 	init_revisions(&rev);
 
 	argc = setup_revisions(argc, argv, &rev, NULL);

builtin-log.c

@@ -47,7 +47,7 @@ int cmd_whatchanged(int argc, const char **argv, char **envp)
 {
 	struct rev_info rev;
 
-	git_config(git_diff_config);
+	git_config(git_diff_ui_config);
 	init_revisions(&rev);
 	rev.diff = 1;
 	rev.diffopt.recursive = 1;
@@ -62,7 +62,7 @@ int cmd_show(int argc, const char **argv, char **envp)
 {
 	struct rev_info rev;
 
-	git_config(git_diff_config);
+	git_config(git_diff_ui_config);
 	init_revisions(&rev);
 	rev.diff = 1;
 	rev.diffopt.recursive = 1;
@@ -79,7 +79,7 @@ int cmd_log(int argc, const char **argv, char **envp)
 {
 	struct rev_info rev;
 
-	git_config(git_diff_config);
+	git_config(git_diff_ui_config);
 	init_revisions(&rev);
 	rev.always_show_header = 1;
 	cmd_log_init(argc, argv, envp, &rev);
@@ -108,7 +108,7 @@ static int git_format_config(const char *var, const char *value)
 	if (!strcmp(var, "diff.color")) {
 		return 0;
 	}
-	return git_diff_config(var, value);
+	return git_diff_ui_config(var, value);
 }
 
 

diff.c

@@ -13,6 +13,7 @@
 
 static int use_size_cache;
 
+static int diff_detect_rename_default = 0;
 static int diff_rename_limit_default = -1;
 static int diff_use_color_default = 0;
 
@@ -101,7 +102,13 @@ static const char *parse_diff_color_value(const char *value, const char *var)
 	die("bad config value '%s' for variable '%s'", value, var);
 }
 
-int git_diff_config(const char *var, const char *value)
+/*
+ * These are to give UI layer defaults.
+ * The core-level commands such as git-diff-files should
+ * never be affected by the setting of diff.renames
+ * the user happens to have in the configuration file.
+ */
+int git_diff_ui_config(const char *var, const char *value)
 {
 	if (!strcmp(var, "diff.renamelimit")) {
 		diff_rename_limit_default = git_config_int(var, value);
@@ -126,6 +133,16 @@ int git_diff_config(const char *var, const char *value)
 			diff_use_color_default = git_config_bool(var, value);
 		return 0;
 	}
+	if (!strcmp(var, "diff.renames")) {
+		if (!value)
+			diff_detect_rename_default = DIFF_DETECT_RENAME;
+		else if (!strcasecmp(value, "copies") ||
+			 !strcasecmp(value, "copy"))
+			diff_detect_rename_default = DIFF_DETECT_COPY;
+		else if (git_config_bool(var,value))
+			diff_detect_rename_default = DIFF_DETECT_RENAME;
+		return 0;
+	}
 	if (!strncmp(var, "diff.color.", 11)) {
 		int slot = parse_diff_color_slot(var, 11);
 		diff_colors[slot] = parse_diff_color_value(value, var);
@@ -1437,6 +1454,7 @@ void diff_setup(struct diff_options *options)
 	options->change = diff_change;
 	options->add_remove = diff_addremove;
 	options->color_diff = diff_use_color_default;
+	options->detect_rename = diff_detect_rename_default;
 }
 
 int diff_setup_done(struct diff_options *options)
@@ -1619,10 +1637,14 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 	}
 	else if (!strcmp(arg, "--color"))
 		options->color_diff = 1;
+	else if (!strcmp(arg, "--no-color"))
+		options->color_diff = 0;
 	else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
 		options->xdl_opts |= XDF_IGNORE_WHITESPACE;
 	else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
 		options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
+	else if (!strcmp(arg, "--no-renames"))
+		options->detect_rename = 0;
 	else
 		return 0;
 	return 1;

diff.h

@@ -123,7 +123,7 @@ extern int diff_scoreopt_parse(const char *opt);
 #define DIFF_SETUP_USE_CACHE		2
 #define DIFF_SETUP_USE_SIZE_CACHE	4
 
-extern int git_diff_config(const char *var, const char *value);
+extern int git_diff_ui_config(const char *var, const char *value);
 extern void diff_setup(struct diff_options *);
 extern int diff_opt_parse(struct diff_options *, const char **, int);
 extern int diff_setup_done(struct diff_options *);

templates/hooks--update

@@ -60,7 +60,7 @@ then
 			echo "Changes since $prev:"
 			git rev-list --pretty $prev..$3 | $short
 			echo ---
-			git diff $prev..$3 | diffstat -p1
+			git diff --stat $prev..$3
 			echo ---
 		fi
 		;;
@@ -75,7 +75,7 @@ else
 	base=$(git-merge-base "$2" "$3")
 	case "$base" in
 	"$2")
-		git diff "$3" "^$base" | diffstat -p1
+		git diff --stat "$3" "^$base"
 		echo
 		echo "New commits:"
 		;;