[PATCH] config: support mixed-case aliases

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To support mixed-case aliases like:

  bM = branch -M
  bD = branch -D

add an argument to git_config_with_options() to block the tolower()
calls on key characters.

Signed-off-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
---
 The static variable is somewhat disturbing, but it's the most obvious
 choice to avoid refactoring config.c heavily.  What do you think?

 alias.c                |  2 +-
 builtin/config.c       |  8 ++++----
 cache.h                |  2 +-
 config.c               | 13 ++++++++++---
 t/t1300-repo-config.sh |  7 +++++++
 5 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/alias.c b/alias.c
index eb9f08b..c428592 100644
--- a/alias.c
+++ b/alias.c
@@ -18,7 +18,7 @@ char *alias_lookup(const char *alias)
 {
 	alias_key = alias;
 	alias_val = NULL;
-	git_config(alias_lookup_cb, NULL);
+	git_config_with_options(alias_lookup_cb, NULL, NULL, 1, 1);
 	return alias_val;
 }
 
diff --git a/builtin/config.c b/builtin/config.c
index 19ffcaf..633b38a 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -218,7 +218,7 @@ static int get_value(const char *key_, const char *regex_)
 	}
 
 	git_config_with_options(collect_config, &values,
-				given_config_file, respect_includes);
+				given_config_file, respect_includes, 0);
 
 	ret = !values.nr;
 
@@ -302,7 +302,7 @@ static void get_color(const char *def_color)
 	get_color_found = 0;
 	parsed_color[0] = '\0';
 	git_config_with_options(git_get_color_config, NULL,
-				given_config_file, respect_includes);
+				given_config_file, respect_includes, 0);
 
 	if (!get_color_found && def_color)
 		color_parse(def_color, "command line", parsed_color);
@@ -330,7 +330,7 @@ static int get_colorbool(int print)
 	get_colorbool_found = -1;
 	get_diff_color_found = -1;
 	git_config_with_options(git_get_colorbool_config, NULL,
-				given_config_file, respect_includes);
+				given_config_file, respect_includes, 0);
 
 	if (get_colorbool_found < 0) {
 		if (!strcmp(get_colorbool_slot, "color.diff"))
@@ -438,7 +438,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 		check_argc(argc, 0, 0);
 		if (git_config_with_options(show_all_config, NULL,
 					    given_config_file,
-					    respect_includes) < 0) {
+					    respect_includes, 0) < 0) {
 			if (given_config_file)
 				die_errno("unable to read config file '%s'",
 					  given_config_file);
diff --git a/cache.h b/cache.h
index 820aa05..27d201e 100644
--- a/cache.h
+++ b/cache.h
@@ -1161,7 +1161,7 @@ extern void git_config_push_parameter(const char *text);
 extern int git_config_from_parameters(config_fn_t fn, void *data);
 extern int git_config(config_fn_t fn, void *);
 extern int git_config_with_options(config_fn_t fn, void *,
-				   const char *filename, int respect_includes);
+				const char *filename, int respect_includes, int respect_mixedcase);
 extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
 extern int git_parse_ulong(const char *, unsigned long *);
 extern int git_config_int(const char *, const char *);
diff --git a/config.c b/config.c
index 7a85ebd..53ad448 100644
--- a/config.c
+++ b/config.c
@@ -23,6 +23,7 @@ typedef struct config_file {
 static config_file *cf;
 
 static int zlib_compression_seen;
+static int allow_mixedcase_keys;
 
 #define MAX_INCLUDE_DEPTH 10
 static const char include_depth_advice[] =
@@ -270,7 +271,9 @@ static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 			break;
 		if (!iskeychar(c))
 			break;
-		strbuf_addch(name, tolower(c));
+		if (!allow_mixedcase_keys)
+			c = tolower(c);
+		strbuf_addch(name, c);
 	}
 
 	while (c == ' ' || c == '\t')
@@ -1005,7 +1008,8 @@ int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 }
 
 int git_config_with_options(config_fn_t fn, void *data,
-			    const char *filename, int respect_includes)
+			const char *filename, int respect_includes,
+			int respect_mixedcase)
 {
 	char *repo_config = NULL;
 	int ret;
@@ -1018,6 +1022,9 @@ int git_config_with_options(config_fn_t fn, void *data,
 		data = &inc;
 	}
 
+	/* For mixed-case aliases */
+	allow_mixedcase_keys = respect_mixedcase ? 1 : 0;
+
 	/*
 	 * If we have a specific filename, use it. Otherwise, follow the
 	 * regular lookup sequence.
@@ -1034,7 +1041,7 @@ int git_config_with_options(config_fn_t fn, void *data,
 
 int git_config(config_fn_t fn, void *data)
 {
-	return git_config_with_options(fn, data, NULL, 1);
+	return git_config_with_options(fn, data, NULL, 1, 0);
 }
 
 /*
diff --git a/t/t1300-repo-config.sh b/t/t1300-repo-config.sh
index c4a7d84..db661a9 100755
--- a/t/t1300-repo-config.sh
+++ b/t/t1300-repo-config.sh
@@ -1021,6 +1021,13 @@ test_expect_success 'git -c works with aliases of builtins' '
 	test_cmp expect actual
 '
 
+test_expect_success 'git -c works with mixed-case aliases of builtins' '
+	git config alias.checkConfig "-c foo.check=bar config foo.check" &&
+	echo bar >expect &&
+	git checkConfig >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'git -c does not split values on equals' '
 	echo "value with = in it" >expect &&
 	git -c core.foo="value with = in it" config core.foo >actual &&
-- 
1.8.3.1.436.gbdff0e3.dirty

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