From 212ad944209a928dbf79faa124de77be5c84532e Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:00:47 -0700
Subject: t7006: modernize calls to unset

These tests break &&-chaining to deal with broken "unset"
implementations. Instead, they should just use sane_unset.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index ed7575d..c0a3135 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -402,7 +402,7 @@ test_core_pager_subdir    expect_success test_must_fail \
 					 'git -p apply </dev/null'
 
 test_expect_success TTY 'command-specific pager' '
-	unset PAGER GIT_PAGER;
+	sane_unset PAGER GIT_PAGER &&
 	echo "foo:initial" >expect &&
 	>actual &&
 	git config --unset core.pager &&
@@ -412,7 +412,7 @@ test_expect_success TTY 'command-specific pager' '
 '
 
 test_expect_success TTY 'command-specific pager overrides core.pager' '
-	unset PAGER GIT_PAGER;
+	sane_unset PAGER GIT_PAGER &&
 	echo "foo:initial" >expect &&
 	>actual &&
 	git config core.pager "exit 1"
-- 
cgit v0.10.2-6-g49f6


From d960c47a881c613a71b1b7c8aab3a06fd91ca70a Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:01:15 -0700
Subject: test-lib: add helper functions for config

There are a few common tasks when working with configuration
variables in tests; this patch aims to make them a little
easier to write and less error-prone.

When setting a variable, you should typically make sure to
clean it up after the test is finished, so as not to pollute
other tests. Like:

   test_when_finished 'git config --unset foo.bar' &&
   git config foo.bar baz

This patch lets you just write:

  test_config foo.bar baz

When clearing a variable that does not exist, git-config
will report a specific non-zero error code. Meaning that
tests which call "git config --unset" often either rely on
the prior tests having actually set it, or must use
test_might_fail. With this patch, the previous:

  test_might_fail git config --unset foo.bar

becomes:

  test_unconfig foo.bar

Not only is this easier to type, but it is more robust; it
will correctly detect errors from git-config besides "key
was not set".

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/test-lib.sh b/t/test-lib.sh
index df25f17..395bf60 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -357,6 +357,24 @@ test_chmod () {
 	git update-index --add "--chmod=$@"
 }
 
+# Unset a configuration variable, but don't fail if it doesn't exist.
+test_unconfig () {
+	git config --unset-all "$@"
+	config_status=$?
+	case "$config_status" in
+	5) # ok, nothing to unset
+		config_status=0
+		;;
+	esac
+	return $config_status
+}
+
+# Set git config, automatically unsetting it after the test is over.
+test_config () {
+	test_when_finished "test_unconfig '$1'" &&
+	git config "$@"
+}
+
 # Use test_set_prereq to tell that a particular prerequisite is available.
 # The prerequisite can later be checked for in two ways:
 #
-- 
cgit v0.10.2-6-g49f6


From 8d68a6d59378760c6bd5c7e0af75fe71c6ed78e7 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:02:06 -0700
Subject: t7006: use test_config helpers

In some cases, this is just making the test script a little
shorter and easier to read. However, there are several
places where we didn't take proper precautions against
polluting downstream tests with our config; this fixes them,
too.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index c0a3135..2ac729f 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -13,7 +13,7 @@ cleanup_fail() {
 
 test_expect_success 'setup' '
 	sane_unset GIT_PAGER GIT_PAGER_IN_USE &&
-	test_might_fail git config --unset core.pager &&
+	test_unconfig core.pager &&
 
 	PAGER="cat >paginated.out" &&
 	export PAGER &&
@@ -94,21 +94,19 @@ test_expect_success TTY 'no pager with --no-pager' '
 
 test_expect_success TTY 'configuration can disable pager' '
 	rm -f paginated.out &&
-	test_might_fail git config --unset pager.grep &&
+	test_unconfig pager.grep &&
 	test_terminal git grep initial &&
 	test -e paginated.out &&
 
 	rm -f paginated.out &&
-	git config pager.grep false &&
-	test_when_finished "git config --unset pager.grep" &&
+	test_config pager.grep false &&
 	test_terminal git grep initial &&
 	! test -e paginated.out
 '
 
 test_expect_success TTY 'git config uses a pager if configured to' '
 	rm -f paginated.out &&
-	git config pager.config true &&
-	test_when_finished "git config --unset pager.config" &&
+	test_config pager.config true &&
 	test_terminal git config --list &&
 	test -e paginated.out
 '
@@ -116,8 +114,7 @@ test_expect_success TTY 'git config uses a pager if configured to' '
 test_expect_success TTY 'configuration can enable pager (from subdir)' '
 	rm -f paginated.out &&
 	mkdir -p subdir &&
-	git config pager.bundle true &&
-	test_when_finished "git config --unset pager.bundle" &&
+	test_config pager.bundle true &&
 
 	git bundle create test.bundle --all &&
 	rm -f paginated.out subdir/paginated.out &&
@@ -150,7 +147,7 @@ test_expect_success 'tests can detect color' '
 
 test_expect_success 'no color when stdout is a regular file' '
 	rm -f colorless.log &&
-	git config color.ui auto ||
+	test_config color.ui auto ||
 	cleanup_fail &&
 
 	git log >colorless.log &&
@@ -159,7 +156,7 @@ test_expect_success 'no color when stdout is a regular file' '
 
 test_expect_success TTY 'color when writing to a pager' '
 	rm -f paginated.out &&
-	git config color.ui auto ||
+	test_config color.ui auto ||
 	cleanup_fail &&
 
 	(
@@ -172,7 +169,7 @@ test_expect_success TTY 'color when writing to a pager' '
 
 test_expect_success 'color when writing to a file intended for a pager' '
 	rm -f colorful.log &&
-	git config color.ui auto ||
+	test_config color.ui auto ||
 	cleanup_fail &&
 
 	(
@@ -221,7 +218,7 @@ test_default_pager() {
 
 	$test_expectation SIMPLEPAGER,TTY "$cmd - default pager is used by default" "
 		sane_unset PAGER GIT_PAGER &&
-		test_might_fail git config --unset core.pager &&
+		test_unconfig core.pager &&
 		rm -f default_pager_used ||
 		cleanup_fail &&
 
@@ -244,7 +241,7 @@ test_PAGER_overrides() {
 
 	$test_expectation TTY "$cmd - PAGER overrides default pager" "
 		sane_unset GIT_PAGER &&
-		test_might_fail git config --unset core.pager &&
+		test_unconfig core.pager &&
 		rm -f PAGER_used ||
 		cleanup_fail &&
 
@@ -277,7 +274,7 @@ test_core_pager() {
 
 		PAGER=wc &&
 		export PAGER &&
-		git config core.pager 'wc >core.pager_used' &&
+		test_config core.pager 'wc >core.pager_used' &&
 		$full_command &&
 		${if_local_config}test -e core.pager_used
 	"
@@ -307,7 +304,7 @@ test_pager_subdir_helper() {
 		PAGER=wc &&
 		stampname=\$(pwd)/core.pager_used &&
 		export PAGER stampname &&
-		git config core.pager 'wc >\"\$stampname\"' &&
+		test_config core.pager 'wc >\"\$stampname\"' &&
 		mkdir sub &&
 		(
 			cd sub &&
@@ -324,7 +321,7 @@ test_GIT_PAGER_overrides() {
 		rm -f GIT_PAGER_used ||
 		cleanup_fail &&
 
-		git config core.pager wc &&
+		test_config core.pager wc &&
 		GIT_PAGER='wc >GIT_PAGER_used' &&
 		export GIT_PAGER &&
 		$full_command &&
@@ -405,8 +402,8 @@ test_expect_success TTY 'command-specific pager' '
 	sane_unset PAGER GIT_PAGER &&
 	echo "foo:initial" >expect &&
 	>actual &&
-	git config --unset core.pager &&
-	git config pager.log "sed s/^/foo:/ >actual" &&
+	test_unconfig core.pager &&
+	test_config pager.log "sed s/^/foo:/ >actual" &&
 	test_terminal git log --format=%s -1 &&
 	test_cmp expect actual
 '
@@ -415,8 +412,8 @@ test_expect_success TTY 'command-specific pager overrides core.pager' '
 	sane_unset PAGER GIT_PAGER &&
 	echo "foo:initial" >expect &&
 	>actual &&
-	git config core.pager "exit 1"
-	git config pager.log "sed s/^/foo:/ >actual" &&
+	test_config core.pager "exit 1"
+	test_config pager.log "sed s/^/foo:/ >actual" &&
 	test_terminal git log --format=%s -1 &&
 	test_cmp expect actual
 '
@@ -425,7 +422,7 @@ test_expect_success TTY 'command-specific pager overridden by environment' '
 	GIT_PAGER="sed s/^/foo:/ >actual" && export GIT_PAGER &&
 	>actual &&
 	echo "foo:initial" >expect &&
-	git config pager.log "exit 1" &&
+	test_config pager.log "exit 1" &&
 	test_terminal git log --format=%s -1 &&
 	test_cmp expect actual
 '
-- 
cgit v0.10.2-6-g49f6


From 2e6c012e10fd866eb3259de3a929e0296daabbaf Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:02:29 -0700
Subject: setup_pager: set GIT_PAGER_IN_USE

We have always set a global "spawned_pager" variable when we
start the pager. This lets us make the auto-color decision
later in the program as as "we are outputting to a terminal,
or to a pager which can handle colors".

Commit 6e9af86 added support for the GIT_PAGER_IN_USE
environment variable. An external program calling git (e.g.,
git-svn) could set this variable to indicate that it had
already started the pager, and that the decision about
auto-coloring should take that into account.

However, 6e9af86 failed to do the reverse, which is to tell
external programs when git itself has started the pager.
Thus a git command implemented as an external script that
has the pager turned on (e.g., "git -p stash show") would
not realize it was going to a pager, and would suppress
colors.

This patch remedies that; we always set GIT_PAGER_IN_USE
when we start the pager, and the value is respected by both
this program and any spawned children.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/pager.c b/pager.c
index dac358f..975955b 100644
--- a/pager.c
+++ b/pager.c
@@ -11,8 +11,6 @@
  * something different on Windows.
  */
 
-static int spawned_pager;
-
 #ifndef WIN32
 static void pager_preexec(void)
 {
@@ -78,7 +76,7 @@ void setup_pager(void)
 	if (!pager)
 		return;
 
-	spawned_pager = 1; /* means we are emitting to terminal */
+	setenv("GIT_PAGER_IN_USE", "true", 1);
 
 	/* spawn the pager */
 	pager_argv[0] = pager;
@@ -109,10 +107,6 @@ void setup_pager(void)
 int pager_in_use(void)
 {
 	const char *env;
-
-	if (spawned_pager)
-		return 1;
-
 	env = getenv("GIT_PAGER_IN_USE");
 	return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
 }
diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 2ac729f..4884e1b 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -181,6 +181,17 @@ test_expect_success 'color when writing to a file intended for a pager' '
 	colorful colorful.log
 '
 
+test_expect_success TTY 'colors are sent to pager for external commands' '
+	test_config alias.externallog "!git log" &&
+	test_config color.ui auto &&
+	(
+		TERM=vt100 &&
+		export TERM &&
+		test_terminal git -p externallog
+	) &&
+	colorful paginated.out
+'
+
 # Use this helper to make it easy for the caller of your
 # terminal-using function to specify whether it should fail.
 # If you write
-- 
cgit v0.10.2-6-g49f6


From f1c9626105d5e4962a5ccaa4620114d03f32ad02 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:03:12 -0700
Subject: diff: refactor COLOR_DIFF from a flag into an int

This lets us store more than just a bit flag for whether we
want color; we can also store whether we want automatic
colors. This can be useful for making the automatic-color
decision closer to the point of use.

This mostly just involves replacing DIFF_OPT_* calls with
manipulations of the flag. The biggest exception is that
calls to DIFF_OPT_TST must check for "o->use_color > 0",
which lets an "unknown" value (i.e., the default) stay at
"no color". In the previous code, a value of "-1" was not
propagated at all.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/merge.c b/builtin/merge.c
index 325891e..7209edf 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -390,8 +390,6 @@ static void finish(const unsigned char *new_head, const char *msg)
 		opts.output_format |=
 			DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 		opts.detect_rename = DIFF_DETECT_RENAME;
-		if (diff_use_color_default > 0)
-			DIFF_OPT_SET(&opts, COLOR_DIFF);
 		if (diff_setup_done(&opts) < 0)
 			die(_("diff_setup_done failed"));
 		diff_tree_sha1(head, new_head, "", &opts);
diff --git a/combine-diff.c b/combine-diff.c
index be67cfc..c588c79 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -702,9 +702,8 @@ static void show_combined_header(struct combine_diff_path *elem,
 	int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
 	const char *a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
 	const char *b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
-	int use_color = DIFF_OPT_TST(opt, COLOR_DIFF);
-	const char *c_meta = diff_get_color(use_color, DIFF_METAINFO);
-	const char *c_reset = diff_get_color(use_color, DIFF_RESET);
+	const char *c_meta = diff_get_color_opt(opt, DIFF_METAINFO);
+	const char *c_reset = diff_get_color_opt(opt, DIFF_RESET);
 	const char *abb;
 	int added = 0;
 	int deleted = 0;
@@ -964,7 +963,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 		show_combined_header(elem, num_parent, dense, rev,
 				     mode_differs, 1);
 		dump_sline(sline, cnt, num_parent,
-			   DIFF_OPT_TST(opt, COLOR_DIFF), result_deleted);
+			   opt->use_color, result_deleted);
 	}
 	free(result);
 
diff --git a/diff.c b/diff.c
index 9038f19..cd5ad75 100644
--- a/diff.c
+++ b/diff.c
@@ -583,11 +583,10 @@ static void emit_rewrite_diff(const char *name_a,
 			      struct diff_options *o)
 {
 	int lc_a, lc_b;
-	int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
 	const char *name_a_tab, *name_b_tab;
-	const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
-	const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
-	const char *reset = diff_get_color(color_diff, DIFF_RESET);
+	const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
+	const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
+	const char *reset = diff_get_color(o->use_color, DIFF_RESET);
 	static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
 	const char *a_prefix, *b_prefix;
 	char *data_one, *data_two;
@@ -623,7 +622,7 @@ static void emit_rewrite_diff(const char *name_a,
 	size_two = fill_textconv(textconv_two, two, &data_two);
 
 	memset(&ecbdata, 0, sizeof(ecbdata));
-	ecbdata.color_diff = color_diff;
+	ecbdata.color_diff = o->use_color > 0;
 	ecbdata.found_changesp = &o->found_changes;
 	ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
 	ecbdata.opt = o;
@@ -1004,7 +1003,7 @@ static void free_diff_words_data(struct emit_callback *ecbdata)
 
 const char *diff_get_color(int diff_use_color, enum color_diff ix)
 {
-	if (diff_use_color)
+	if (diff_use_color > 0)
 		return diff_colors[ix];
 	return "";
 }
@@ -1786,11 +1785,10 @@ static int is_conflict_marker(const char *line, int marker_size, unsigned long l
 static void checkdiff_consume(void *priv, char *line, unsigned long len)
 {
 	struct checkdiff_t *data = priv;
-	int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
 	int marker_size = data->conflict_marker_size;
-	const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
-	const char *reset = diff_get_color(color_diff, DIFF_RESET);
-	const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
+	const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
+	const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
+	const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
 	char *err;
 	char *line_prefix = "";
 	struct strbuf *msgbuf;
@@ -2135,7 +2133,7 @@ static void builtin_diff(const char *name_a,
 		memset(&xecfg, 0, sizeof(xecfg));
 		memset(&ecbdata, 0, sizeof(ecbdata));
 		ecbdata.label_path = lbl;
-		ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
+		ecbdata.color_diff = o->use_color > 0;
 		ecbdata.found_changesp = &o->found_changes;
 		ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
 		if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
@@ -2183,7 +2181,7 @@ static void builtin_diff(const char *name_a,
 					break;
 				}
 			}
-			if (DIFF_OPT_TST(o, COLOR_DIFF)) {
+			if (o->use_color > 0) {
 				struct diff_words_style *st = ecbdata.diff_words->style;
 				st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
 				st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
@@ -2833,7 +2831,7 @@ static void run_diff_cmd(const char *pgm,
 		 */
 		fill_metainfo(msg, name, other, one, two, o, p,
 			      &must_show_header,
-			      DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
+			      o->use_color > 0 && !pgm);
 		xfrm_msg = msg->len ? msg->buf : NULL;
 	}
 
@@ -2999,8 +2997,7 @@ void diff_setup(struct diff_options *options)
 
 	options->change = diff_change;
 	options->add_remove = diff_addremove;
-	if (diff_use_color_default > 0)
-		DIFF_OPT_SET(options, COLOR_DIFF);
+	options->use_color = diff_use_color_default;
 	options->detect_rename = diff_detect_rename_default;
 
 	if (diff_no_prefix) {
@@ -3374,24 +3371,24 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 	else if (!strcmp(arg, "--follow"))
 		DIFF_OPT_SET(options, FOLLOW_RENAMES);
 	else if (!strcmp(arg, "--color"))
-		DIFF_OPT_SET(options, COLOR_DIFF);
+		options->use_color = 1;
 	else if (!prefixcmp(arg, "--color=")) {
 		int value = git_config_colorbool(NULL, arg+8, -1);
 		if (value == 0)
-			DIFF_OPT_CLR(options, COLOR_DIFF);
+			options->use_color = 0;
 		else if (value > 0)
-			DIFF_OPT_SET(options, COLOR_DIFF);
+			options->use_color = 1;
 		else
 			return error("option `color' expects \"always\", \"auto\", or \"never\"");
 	}
 	else if (!strcmp(arg, "--no-color"))
-		DIFF_OPT_CLR(options, COLOR_DIFF);
+		options->use_color = 0;
 	else if (!strcmp(arg, "--color-words")) {
-		DIFF_OPT_SET(options, COLOR_DIFF);
+		options->use_color = 1;
 		options->word_diff = DIFF_WORDS_COLOR;
 	}
 	else if (!prefixcmp(arg, "--color-words=")) {
-		DIFF_OPT_SET(options, COLOR_DIFF);
+		options->use_color = 1;
 		options->word_diff = DIFF_WORDS_COLOR;
 		options->word_regex = arg + 14;
 	}
@@ -3404,7 +3401,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 		if (!strcmp(type, "plain"))
 			options->word_diff = DIFF_WORDS_PLAIN;
 		else if (!strcmp(type, "color")) {
-			DIFF_OPT_SET(options, COLOR_DIFF);
+			options->use_color = 1;
 			options->word_diff = DIFF_WORDS_COLOR;
 		}
 		else if (!strcmp(type, "porcelain"))
diff --git a/diff.h b/diff.h
index 6d303c1..04a9ad7 100644
--- a/diff.h
+++ b/diff.h
@@ -58,7 +58,7 @@ typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data)
 #define DIFF_OPT_SILENT_ON_REMOVE    (1 <<  5)
 #define DIFF_OPT_FIND_COPIES_HARDER  (1 <<  6)
 #define DIFF_OPT_FOLLOW_RENAMES      (1 <<  7)
-#define DIFF_OPT_COLOR_DIFF          (1 <<  8)
+/* (1 <<  8) unused */
 /* (1 <<  9) unused */
 #define DIFF_OPT_HAS_CHANGES         (1 << 10)
 #define DIFF_OPT_QUICK               (1 << 11)
@@ -101,6 +101,7 @@ struct diff_options {
 	const char *single_follow;
 	const char *a_prefix, *b_prefix;
 	unsigned flags;
+	int use_color;
 	int context;
 	int interhunkcontext;
 	int break_opt;
@@ -159,7 +160,7 @@ enum color_diff {
 };
 const char *diff_get_color(int diff_use_color, enum color_diff ix);
 #define diff_get_color_opt(o, ix) \
-	diff_get_color(DIFF_OPT_TST((o), COLOR_DIFF), ix)
+	diff_get_color((o)->use_color, ix)
 
 
 extern const char mime_boundary_leader[];
diff --git a/graph.c b/graph.c
index 2f6893d..556834a 100644
--- a/graph.c
+++ b/graph.c
@@ -347,7 +347,7 @@ static struct commit_list *first_interesting_parent(struct git_graph *graph)
 
 static unsigned short graph_get_current_column_color(const struct git_graph *graph)
 {
-	if (!DIFF_OPT_TST(&graph->revs->diffopt, COLOR_DIFF))
+	if (graph->revs->diffopt.use_color <= 0)
 		return column_colors_max;
 	return graph->default_column_color;
 }
diff --git a/log-tree.c b/log-tree.c
index e945701..9ba8fb2 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -31,7 +31,7 @@ static char decoration_colors[][COLOR_MAXLEN] = {
 
 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
 {
-	if (decorate_use_color)
+	if (decorate_use_color > 0)
 		return decoration_colors[ix];
 	return "";
 }
@@ -77,7 +77,7 @@ int parse_decorate_color_config(const char *var, const int ofs, const char *valu
  * for showing the commit sha1, use the same check for --decorate
  */
 #define decorate_get_color_opt(o, ix) \
-	decorate_get_color(DIFF_OPT_TST((o), COLOR_DIFF), ix)
+	decorate_get_color((o)->use_color, ix)
 
 static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
 {
diff --git a/wt-status.c b/wt-status.c
index 9f4e0ba..da4bce5 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -681,7 +681,7 @@ static void wt_status_print_verbose(struct wt_status *s)
 	 * will have checked isatty on stdout).
 	 */
 	if (s->fp != stdout)
-		DIFF_OPT_CLR(&rev.diffopt, COLOR_DIFF);
+		rev.diffopt.use_color = 0;
 	run_diff_index(&rev, 1);
 }
 
-- 
cgit v0.10.2-6-g49f6


From e269eb7946d0a4ba6a4e175133b5479446ac04a5 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:03:48 -0700
Subject: git_config_colorbool: refactor stdout_is_tty handling

Usually this function figures out for itself whether stdout
is a tty. However, it has an extra parameter just to allow
git-config to override the auto-detection for its
--get-colorbool option.

Instead of an extra parameter, let's just use a global
variable. This makes calling easier in the common case, and
will make refactoring the colorbool code much simpler.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/branch.c b/builtin/branch.c
index 3142daa..b15fee5 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -71,7 +71,7 @@ static int parse_branch_color_slot(const char *var, int ofs)
 static int git_branch_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "color.branch")) {
-		branch_use_color = git_config_colorbool(var, value, -1);
+		branch_use_color = git_config_colorbool(var, value);
 		return 0;
 	}
 	if (!prefixcmp(var, "color.branch.")) {
diff --git a/builtin/commit.c b/builtin/commit.c
index e1af9b1..295803a 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1144,7 +1144,7 @@ static int git_status_config(const char *k, const char *v, void *cb)
 		return 0;
 	}
 	if (!strcmp(k, "status.color") || !strcmp(k, "color.status")) {
-		s->use_color = git_config_colorbool(k, v, -1);
+		s->use_color = git_config_colorbool(k, v);
 		return 0;
 	}
 	if (!prefixcmp(k, "status.color.") || !prefixcmp(k, "color.status.")) {
diff --git a/builtin/config.c b/builtin/config.c
index 211e118..5505ced 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -303,24 +303,17 @@ static void get_color(const char *def_color)
 	fputs(parsed_color, stdout);
 }
 
-static int stdout_is_tty;
 static int get_colorbool_found;
 static int get_diff_color_found;
 static int git_get_colorbool_config(const char *var, const char *value,
 		void *cb)
 {
-	if (!strcmp(var, get_colorbool_slot)) {
-		get_colorbool_found =
-			git_config_colorbool(var, value, stdout_is_tty);
-	}
-	if (!strcmp(var, "diff.color")) {
-		get_diff_color_found =
-			git_config_colorbool(var, value, stdout_is_tty);
-	}
-	if (!strcmp(var, "color.ui")) {
-		git_use_color_default = git_config_colorbool(var, value, stdout_is_tty);
-		return 0;
-	}
+	if (!strcmp(var, get_colorbool_slot))
+		get_colorbool_found = git_config_colorbool(var, value);
+	else if (!strcmp(var, "diff.color"))
+		get_diff_color_found = git_config_colorbool(var, value);
+	else if (!strcmp(var, "color.ui"))
+		git_use_color_default = git_config_colorbool(var, value);
 	return 0;
 }
 
@@ -510,9 +503,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 	}
 	else if (actions == ACTION_GET_COLORBOOL) {
 		if (argc == 1)
-			stdout_is_tty = git_config_bool("command line", argv[0]);
-		else if (argc == 0)
-			stdout_is_tty = isatty(1);
+			color_stdout_is_tty = git_config_bool("command line", argv[0]);
 		return get_colorbool(argc != 0);
 	}
 
diff --git a/builtin/grep.c b/builtin/grep.c
index 871afaa..c17d7de 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -316,7 +316,7 @@ static int grep_config(const char *var, const char *value, void *cb)
 	}
 
 	if (!strcmp(var, "color.grep"))
-		opt->color = git_config_colorbool(var, value, -1);
+		opt->color = git_config_colorbool(var, value);
 	else if (!strcmp(var, "color.grep.context"))
 		color = opt->color_context;
 	else if (!strcmp(var, "color.grep.filename"))
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index facc63a..e6650b4 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -573,7 +573,7 @@ static int git_show_branch_config(const char *var, const char *value, void *cb)
 	}
 
 	if (!strcmp(var, "color.showbranch")) {
-		showbranch_use_color = git_config_colorbool(var, value, -1);
+		showbranch_use_color = git_config_colorbool(var, value);
 		return 0;
 	}
 
diff --git a/color.c b/color.c
index 3db214c..67affa4 100644
--- a/color.c
+++ b/color.c
@@ -2,6 +2,7 @@
 #include "color.h"
 
 int git_use_color_default = 0;
+int color_stdout_is_tty = -1;
 
 /*
  * The list of available column colors.
@@ -157,7 +158,7 @@ bad:
 	die("bad color value '%.*s' for variable '%s'", value_len, value, var);
 }
 
-int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
+int git_config_colorbool(const char *var, const char *value)
 {
 	if (value) {
 		if (!strcasecmp(value, "never"))
@@ -177,9 +178,9 @@ int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 
 	/* any normal truth value defaults to 'auto' */
  auto_color:
-	if (stdout_is_tty < 0)
-		stdout_is_tty = isatty(1);
-	if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
+	if (color_stdout_is_tty < 0)
+		color_stdout_is_tty = isatty(1);
+	if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
 		char *term = getenv("TERM");
 		if (term && strcmp(term, "dumb"))
 			return 1;
@@ -190,7 +191,7 @@ int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 int git_color_default_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "color.ui")) {
-		git_use_color_default = git_config_colorbool(var, value, -1);
+		git_use_color_default = git_config_colorbool(var, value);
 		return 0;
 	}
 
diff --git a/color.h b/color.h
index 68a926a..a190a25 100644
--- a/color.h
+++ b/color.h
@@ -58,11 +58,17 @@ extern const char *column_colors_ansi[];
 extern const int column_colors_ansi_max;
 
 /*
+ * Generally the color code will lazily figure this out itself, but
+ * this provides a mechanism for callers to override autodetection.
+ */
+extern int color_stdout_is_tty;
+
+/*
  * Use this instead of git_default_config if you need the value of color.ui.
  */
 int git_color_default_config(const char *var, const char *value, void *cb);
 
-int git_config_colorbool(const char *var, const char *value, int stdout_is_tty);
+int git_config_colorbool(const char *var, const char *value);
 void color_parse(const char *value, const char *var, char *dst);
 void color_parse_mem(const char *value, int len, const char *var, char *dst);
 __attribute__((format (printf, 3, 4)))
diff --git a/diff.c b/diff.c
index cd5ad75..1f87f23 100644
--- a/diff.c
+++ b/diff.c
@@ -137,7 +137,7 @@ static int git_config_rename(const char *var, const char *value)
 int git_diff_ui_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
-		diff_use_color_default = git_config_colorbool(var, value, -1);
+		diff_use_color_default = git_config_colorbool(var, value);
 		return 0;
 	}
 	if (!strcmp(var, "diff.renames")) {
@@ -3373,7 +3373,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 	else if (!strcmp(arg, "--color"))
 		options->use_color = 1;
 	else if (!prefixcmp(arg, "--color=")) {
-		int value = git_config_colorbool(NULL, arg+8, -1);
+		int value = git_config_colorbool(NULL, arg+8);
 		if (value == 0)
 			options->use_color = 0;
 		else if (value > 0)
diff --git a/parse-options.c b/parse-options.c
index 73bd28a..12a5b25 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -620,7 +620,7 @@ int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 
 	if (!arg)
 		arg = unset ? "never" : (const char *)opt->defval;
-	value = git_config_colorbool(NULL, arg, -1);
+	value = git_config_colorbool(NULL, arg);
 	if (value < 0)
 		return opterror(opt,
 			"expects \"always\", \"auto\", or \"never\"", 0);
-- 
cgit v0.10.2-6-g49f6


From daa0c3d9717624a62ce669252be832db12658ec0 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:04:23 -0700
Subject: color: delay auto-color decision until point of use

When we read a color value either from a config file or from
the command line, we use git_config_colorbool to convert it
from the tristate always/never/auto into a single yes/no
boolean value.

This has some timing implications with respect to starting
a pager.

If we start (or decide not to start) the pager before
checking the colorbool, everything is fine. Either isatty(1)
will give us the right information, or we will properly
check for pager_in_use().

However, if we decide to start a pager after we have checked
the colorbool, things are not so simple. If stdout is a tty,
then we will have already decided to use color. However, the
user may also have configured color.pager not to use color
with the pager. In this case, we need to actually turn off
color. Unfortunately, the pager code has no idea which color
variables were turned on (and there are many of them
throughout the code, and they may even have been manipulated
after the colorbool selection by something like "--color" on
the command line).

This bug can be seen any time a pager is started after
config and command line options are checked. This has
affected "git diff" since 89d07f7 (diff: don't run pager if
user asked for a diff style exit code, 2007-08-12). It has
also affect the log family since 1fda91b (Fix 'git log'
early pager startup error case, 2010-08-24).

This patch splits the notion of parsing a colorbool and
actually checking the configuration. The "use_color"
variables now have an additional possible value,
GIT_COLOR_AUTO. Users of the variable should use the new
"want_color()" wrapper, which will lazily determine and
cache the auto-color decision.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/branch.c b/builtin/branch.c
index b15fee5..d6d3c7d 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -88,7 +88,7 @@ static int git_branch_config(const char *var, const char *value, void *cb)
 
 static const char *branch_get_color(enum color_branch ix)
 {
-	if (branch_use_color > 0)
+	if (want_color(branch_use_color))
 		return branch_colors[ix];
 	return "";
 }
diff --git a/builtin/config.c b/builtin/config.c
index 5505ced..3a09296 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -330,6 +330,8 @@ static int get_colorbool(int print)
 			get_colorbool_found = git_use_color_default;
 	}
 
+	get_colorbool_found = want_color(get_colorbool_found);
+
 	if (print) {
 		printf("%s\n", get_colorbool_found ? "true" : "false");
 		return 0;
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index e6650b4..4b726fa 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -26,14 +26,14 @@ static const char **default_arg;
 
 static const char *get_color_code(int idx)
 {
-	if (showbranch_use_color)
+	if (want_color(showbranch_use_color))
 		return column_colors_ansi[idx % column_colors_ansi_max];
 	return "";
 }
 
 static const char *get_color_reset_code(void)
 {
-	if (showbranch_use_color)
+	if (want_color(showbranch_use_color))
 		return GIT_COLOR_RESET;
 	return "";
 }
diff --git a/color.c b/color.c
index 67affa4..8586417 100644
--- a/color.c
+++ b/color.c
@@ -166,7 +166,7 @@ int git_config_colorbool(const char *var, const char *value)
 		if (!strcasecmp(value, "always"))
 			return 1;
 		if (!strcasecmp(value, "auto"))
-			goto auto_color;
+			return GIT_COLOR_AUTO;
 	}
 
 	if (!var)
@@ -177,7 +177,11 @@ int git_config_colorbool(const char *var, const char *value)
 		return 0;
 
 	/* any normal truth value defaults to 'auto' */
- auto_color:
+	return GIT_COLOR_AUTO;
+}
+
+static int check_auto_color(void)
+{
 	if (color_stdout_is_tty < 0)
 		color_stdout_is_tty = isatty(1);
 	if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
@@ -188,6 +192,18 @@ int git_config_colorbool(const char *var, const char *value)
 	return 0;
 }
 
+int want_color(int var)
+{
+	static int want_auto = -1;
+
+	if (var == GIT_COLOR_AUTO) {
+		if (want_auto < 0)
+			want_auto = check_auto_color();
+		return want_auto;
+	}
+	return var > 0;
+}
+
 int git_color_default_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "color.ui")) {
diff --git a/color.h b/color.h
index a190a25..b413e0e 100644
--- a/color.h
+++ b/color.h
@@ -49,6 +49,16 @@ struct strbuf;
 #define GIT_COLOR_NIL "NIL"
 
 /*
+ * The first three are chosen to match common usage in the code, and what is
+ * returned from git_config_colorbool. The "auto" value can be returned from
+ * config_colorbool, and will be converted by want_color() into either 0 or 1.
+ */
+#define GIT_COLOR_UNKNOWN -1
+#define GIT_COLOR_NEVER  0
+#define GIT_COLOR_ALWAYS 1
+#define GIT_COLOR_AUTO   2
+
+/*
  * This variable stores the value of color.ui
  */
 extern int git_use_color_default;
@@ -69,6 +79,7 @@ extern int color_stdout_is_tty;
 int git_color_default_config(const char *var, const char *value, void *cb);
 
 int git_config_colorbool(const char *var, const char *value);
+int want_color(int var);
 void color_parse(const char *value, const char *var, char *dst);
 void color_parse_mem(const char *value, int len, const char *var, char *dst);
 __attribute__((format (printf, 3, 4)))
diff --git a/diff.c b/diff.c
index 1f87f23..0496cdc 100644
--- a/diff.c
+++ b/diff.c
@@ -622,7 +622,7 @@ static void emit_rewrite_diff(const char *name_a,
 	size_two = fill_textconv(textconv_two, two, &data_two);
 
 	memset(&ecbdata, 0, sizeof(ecbdata));
-	ecbdata.color_diff = o->use_color > 0;
+	ecbdata.color_diff = want_color(o->use_color);
 	ecbdata.found_changesp = &o->found_changes;
 	ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
 	ecbdata.opt = o;
@@ -1003,7 +1003,7 @@ static void free_diff_words_data(struct emit_callback *ecbdata)
 
 const char *diff_get_color(int diff_use_color, enum color_diff ix)
 {
-	if (diff_use_color > 0)
+	if (want_color(diff_use_color))
 		return diff_colors[ix];
 	return "";
 }
@@ -2133,7 +2133,7 @@ static void builtin_diff(const char *name_a,
 		memset(&xecfg, 0, sizeof(xecfg));
 		memset(&ecbdata, 0, sizeof(ecbdata));
 		ecbdata.label_path = lbl;
-		ecbdata.color_diff = o->use_color > 0;
+		ecbdata.color_diff = want_color(o->use_color);
 		ecbdata.found_changesp = &o->found_changes;
 		ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
 		if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
@@ -2181,7 +2181,7 @@ static void builtin_diff(const char *name_a,
 					break;
 				}
 			}
-			if (o->use_color > 0) {
+			if (want_color(o->use_color)) {
 				struct diff_words_style *st = ecbdata.diff_words->style;
 				st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
 				st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
@@ -2831,7 +2831,7 @@ static void run_diff_cmd(const char *pgm,
 		 */
 		fill_metainfo(msg, name, other, one, two, o, p,
 			      &must_show_header,
-			      o->use_color > 0 && !pgm);
+			      want_color(o->use_color) && !pgm);
 		xfrm_msg = msg->len ? msg->buf : NULL;
 	}
 
@@ -3374,12 +3374,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 		options->use_color = 1;
 	else if (!prefixcmp(arg, "--color=")) {
 		int value = git_config_colorbool(NULL, arg+8);
-		if (value == 0)
-			options->use_color = 0;
-		else if (value > 0)
-			options->use_color = 1;
-		else
+		if (value < 0)
 			return error("option `color' expects \"always\", \"auto\", or \"never\"");
+		options->use_color = value;
 	}
 	else if (!strcmp(arg, "--no-color"))
 		options->use_color = 0;
diff --git a/graph.c b/graph.c
index 556834a..7358416 100644
--- a/graph.c
+++ b/graph.c
@@ -347,7 +347,7 @@ static struct commit_list *first_interesting_parent(struct git_graph *graph)
 
 static unsigned short graph_get_current_column_color(const struct git_graph *graph)
 {
-	if (graph->revs->diffopt.use_color <= 0)
+	if (!want_color(graph->revs->diffopt.use_color))
 		return column_colors_max;
 	return graph->default_column_color;
 }
diff --git a/grep.c b/grep.c
index d03d9e2..e52654b 100644
--- a/grep.c
+++ b/grep.c
@@ -430,7 +430,7 @@ static int word_char(char ch)
 static void output_color(struct grep_opt *opt, const void *data, size_t size,
 			 const char *color)
 {
-	if (opt->color && color && color[0]) {
+	if (want_color(opt->color) && color && color[0]) {
 		opt->output(opt, color, strlen(color));
 		opt->output(opt, data, size);
 		opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
diff --git a/log-tree.c b/log-tree.c
index 9ba8fb2..95d6d40 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -31,7 +31,7 @@ static char decoration_colors[][COLOR_MAXLEN] = {
 
 static const char *decorate_get_color(int decorate_use_color, enum decoration_type ix)
 {
-	if (decorate_use_color > 0)
+	if (want_color(decorate_use_color))
 		return decoration_colors[ix];
 	return "";
 }
diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 4884e1b..4582336 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -167,6 +167,18 @@ test_expect_success TTY 'color when writing to a pager' '
 	colorful paginated.out
 '
 
+test_expect_success TTY 'colors are suppressed by color.pager' '
+	rm -f paginated.out &&
+	test_config color.ui auto &&
+	test_config color.pager false &&
+	(
+		TERM=vt100 &&
+		export TERM &&
+		test_terminal git log
+	) &&
+	! colorful paginated.out
+'
+
 test_expect_success 'color when writing to a file intended for a pager' '
 	rm -f colorful.log &&
 	test_config color.ui auto ||
diff --git a/wt-status.c b/wt-status.c
index da4bce5..f2016dc 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -26,7 +26,9 @@ static char default_wt_status_colors[][COLOR_MAXLEN] = {
 
 static const char *color(int slot, struct wt_status *s)
 {
-	const char *c = s->use_color > 0 ? s->color_palette[slot] : "";
+	const char *c = "";
+	if (want_color(s->use_color))
+		c = s->color_palette[slot];
 	if (slot == WT_STATUS_ONBRANCH && color_is_nil(c))
 		c = s->color_palette[WT_STATUS_HEADER];
 	return c;
-- 
cgit v0.10.2-6-g49f6


From c659f55b31bb928688afd4ddfd94f8bea978ff1a Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:04:56 -0700
Subject: config: refactor get_colorbool function

For "git config --get-colorbool color.foo", we use a custom
callback that looks not only for the key that the user gave
us, but also for "diff.color" (for backwards compatibility)
and "color.ui" (as a fallback).

For the former, we use a custom variable to store the
diff.color value. For the latter, though, we store it in the
main "git_use_color_default" variable, turning on color.ui
for any other parts of git that respect this value.

In practice, this doesn't cause any bugs, because git-config
runs without caring about git_use_color_default, and then
exits. But it crosses module boundaries in an unusual and
confusing way, and it makes refactoring color handling
harder than it needs to be.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/config.c b/builtin/config.c
index 3a09296..0b4ecac 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -305,6 +305,7 @@ static void get_color(const char *def_color)
 
 static int get_colorbool_found;
 static int get_diff_color_found;
+static int get_color_ui_found;
 static int git_get_colorbool_config(const char *var, const char *value,
 		void *cb)
 {
@@ -313,7 +314,7 @@ static int git_get_colorbool_config(const char *var, const char *value,
 	else if (!strcmp(var, "diff.color"))
 		get_diff_color_found = git_config_colorbool(var, value);
 	else if (!strcmp(var, "color.ui"))
-		git_use_color_default = git_config_colorbool(var, value);
+		get_color_ui_found = git_config_colorbool(var, value);
 	return 0;
 }
 
@@ -327,7 +328,7 @@ static int get_colorbool(int print)
 		if (!strcmp(get_colorbool_slot, "color.diff"))
 			get_colorbool_found = get_diff_color_found;
 		if (get_colorbool_found < 0)
-			get_colorbool_found = git_use_color_default;
+			get_colorbool_found = get_color_ui_found;
 	}
 
 	get_colorbool_found = want_color(get_colorbool_found);
-- 
cgit v0.10.2-6-g49f6


From 3e1dd17a8958cc5fe47a7ca01c9da8f6fae9cb0b Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:05:08 -0700
Subject: diff: don't load color config in plumbing

The diff config callback is split into two functions: one
which loads "ui" config, and one which loads "basic" config.
The former chains to the latter, as the diff UI config is a
superset of the plumbing config.

The color.diff variable is only loaded in the UI config.
However, the basic config actually chains to
git_color_default_config, which loads color.ui. This doesn't
actually cause any bugs, because the plumbing diff code does
not actually look at the value of color.ui.

However, it is somewhat nonsensical, and it makes it
difficult to refactor the color code. It probably came about
because there is no git_color_config to load only color
config, but rather just git_color_default_config, which
loads color config and chains to git_default_config.

This patch splits out the color-specific portion of
git_color_default_config so that the diff UI config can call
it directly. This is perhaps better explained by the
chaining of callbacks. Before we had:

  git_diff_ui_config
    -> git_diff_basic_config
      -> git_color_default_config
        -> git_default_config

Now we have:

  git_diff_ui_config
    -> git_color_config
    -> git_diff_basic_config
      -> git_default_config

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/color.c b/color.c
index 8586417..ec96fe1 100644
--- a/color.c
+++ b/color.c
@@ -204,13 +204,21 @@ int want_color(int var)
 	return var > 0;
 }
 
-int git_color_default_config(const char *var, const char *value, void *cb)
+int git_color_config(const char *var, const char *value, void *cb)
 {
 	if (!strcmp(var, "color.ui")) {
 		git_use_color_default = git_config_colorbool(var, value);
 		return 0;
 	}
 
+	return 0;
+}
+
+int git_color_default_config(const char *var, const char *value, void *cb)
+{
+	if (git_color_config(var, value, cb) < 0)
+		return -1;
+
 	return git_default_config(var, value, cb);
 }
 
diff --git a/color.h b/color.h
index b413e0e..3e515f2 100644
--- a/color.h
+++ b/color.h
@@ -74,8 +74,10 @@ extern const int column_colors_ansi_max;
 extern int color_stdout_is_tty;
 
 /*
- * Use this instead of git_default_config if you need the value of color.ui.
+ * Use the first one if you need only color config; the second is a convenience
+ * if you are just going to change to git_default_config, too.
  */
+int git_color_config(const char *var, const char *value, void *cb);
 int git_color_default_config(const char *var, const char *value, void *cb);
 
 int git_config_colorbool(const char *var, const char *value);
diff --git a/diff.c b/diff.c
index 0496cdc..052e42a 100644
--- a/diff.c
+++ b/diff.c
@@ -164,6 +164,9 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 	if (!strcmp(var, "diff.ignoresubmodules"))
 		handle_ignore_submodules_arg(&default_diff_options, value);
 
+	if (git_color_config(var, value, cb) < 0)
+		return -1;
+
 	return git_diff_basic_config(var, value, cb);
 }
 
@@ -212,7 +215,7 @@ int git_diff_basic_config(const char *var, const char *value, void *cb)
 	if (!prefixcmp(var, "submodule."))
 		return parse_submodule_config_option(var, value);
 
-	return git_color_default_config(var, value, cb);
+	return git_default_config(var, value, cb);
 }
 
 static char *quote_two(const char *one, const char *two)
-- 
cgit v0.10.2-6-g49f6


From c9bfb953489e559d513c1627150aa16f8d42d6c5 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 17 Aug 2011 22:05:35 -0700
Subject: want_color: automatically fallback to color.ui

All of the "do we want color" flags default to -1 to
indicate that we don't have any color configured. This value
is handled in one of two ways:

  1. In porcelain, we check early on whether the value is
     still -1 after reading the config, and set it to the
     value of color.ui (which defaults to 0).

  2. In plumbing, it stays untouched as -1, and want_color
     defaults it to off.

This works fine, but means that every porcelain has to check
and reassign its color flag. Now that want_color gives us a
place to put this check in a single spot, we can do that,
simplifying the calling code.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/branch.c b/builtin/branch.c
index d6d3c7d..73d4170 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -673,9 +673,6 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
 	git_config(git_branch_config, NULL);
 
-	if (branch_use_color == -1)
-		branch_use_color = git_use_color_default;
-
 	track = git_branch_track;
 
 	head = resolve_ref("HEAD", head_sha1, 0, NULL);
diff --git a/builtin/commit.c b/builtin/commit.c
index 295803a..9763146 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1237,10 +1237,6 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 
 	if (s.relative_paths)
 		s.prefix = prefix;
-	if (s.use_color == -1)
-		s.use_color = git_use_color_default;
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
 
 	switch (status_format) {
 	case STATUS_FORMAT_SHORT:
@@ -1394,15 +1390,10 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 	git_config(git_commit_config, &s);
 	determine_whence(&s);
 
-	if (s.use_color == -1)
-		s.use_color = git_use_color_default;
 	argc = parse_and_validate_options(argc, argv, builtin_commit_usage,
 					  prefix, &s);
-	if (dry_run) {
-		if (diff_use_color_default == -1)
-			diff_use_color_default = git_use_color_default;
+	if (dry_run)
 		return dry_run_commit(argc, argv, prefix, &s);
-	}
 	index_file = prepare_index(argc, argv, prefix, 0);
 
 	/* Set up everything for writing the commit object.  This includes
diff --git a/builtin/diff.c b/builtin/diff.c
index 69cd5ee..1118689 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -277,9 +277,6 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 	gitmodules_config();
 	git_config(git_diff_ui_config, NULL);
 
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
 	init_revisions(&rev, prefix);
 
 	/* If this is a no-index diff, just run it and exit there. */
diff --git a/builtin/grep.c b/builtin/grep.c
index c17d7de..18522ca 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -883,8 +883,6 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	strcpy(opt.color_sep, GIT_COLOR_CYAN);
 	opt.color = -1;
 	git_config(grep_config, &opt);
-	if (opt.color == -1)
-		opt.color = git_use_color_default;
 
 	/*
 	 * If there is no -- then the paths must exist in the working
diff --git a/builtin/log.c b/builtin/log.c
index 5c2af59..d760ee0 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -359,9 +359,6 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 
 	git_config(git_log_config, NULL);
 
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
 	init_revisions(&rev, prefix);
 	rev.diff = 1;
 	rev.simplify_history = 0;
@@ -446,9 +443,6 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 
 	git_config(git_log_config, NULL);
 
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
 	init_pathspec(&match_all, NULL);
 	init_revisions(&rev, prefix);
 	rev.diff = 1;
@@ -524,9 +518,6 @@ int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 
 	git_config(git_log_config, NULL);
 
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
 	init_revisions(&rev, prefix);
 	init_reflog_walk(&rev.reflog_info);
 	rev.verbose_header = 1;
@@ -549,9 +540,6 @@ int cmd_log(int argc, const char **argv, const char *prefix)
 
 	git_config(git_log_config, NULL);
 
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
 	init_revisions(&rev, prefix);
 	rev.always_show_header = 1;
 	memset(&opt, 0, sizeof(opt));
diff --git a/builtin/merge.c b/builtin/merge.c
index 7209edf..b75ae01 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1031,10 +1031,6 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 
 	git_config(git_merge_config, NULL);
 
-	/* for color.ui */
-	if (diff_use_color_default == -1)
-		diff_use_color_default = git_use_color_default;
-
 	if (branch_mergeoptions)
 		parse_branch_merge_options(branch_mergeoptions);
 	argc = parse_options(argc, argv, prefix, builtin_merge_options,
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index 4b726fa..4b480d7 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -685,9 +685,6 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 
 	git_config(git_show_branch_config, NULL);
 
-	if (showbranch_use_color == -1)
-		showbranch_use_color = git_use_color_default;
-
 	/* If nothing is specified, try the default first */
 	if (ac == 1 && default_num) {
 		ac = default_num;
diff --git a/color.c b/color.c
index ec96fe1..e8e2681 100644
--- a/color.c
+++ b/color.c
@@ -1,7 +1,7 @@
 #include "cache.h"
 #include "color.h"
 
-int git_use_color_default = 0;
+static int git_use_color_default = 0;
 int color_stdout_is_tty = -1;
 
 /*
@@ -196,12 +196,15 @@ int want_color(int var)
 {
 	static int want_auto = -1;
 
+	if (var < 0)
+		var = git_use_color_default;
+
 	if (var == GIT_COLOR_AUTO) {
 		if (want_auto < 0)
 			want_auto = check_auto_color();
 		return want_auto;
 	}
-	return var > 0;
+	return var;
 }
 
 int git_color_config(const char *var, const char *value, void *cb)
diff --git a/color.h b/color.h
index 3e515f2..9a8495b 100644
--- a/color.h
+++ b/color.h
@@ -58,11 +58,6 @@ struct strbuf;
 #define GIT_COLOR_ALWAYS 1
 #define GIT_COLOR_AUTO   2
 
-/*
- * This variable stores the value of color.ui
- */
-extern int git_use_color_default;
-
 /* A default list of colors to use for commit graphs and show-branch output */
 extern const char *column_colors_ansi[];
 extern const int column_colors_ansi_max;
-- 
cgit v0.10.2-6-g49f6