Subject: [PATCH v9 0/2] builtin/config.c: support `--type=<type>` as preferred alias for `--type`

From: Taylor Blau <[email-masked]>
Date: Wed, 18 Apr 2018 14:43:28 -0700

Hi,

Attached is my final re-roll of the series to add `--type=<type>` as a
supported replacement for `--<type>`.

Since the last time, I have changed the following:

  * OPT_CALLBACK_VALUE no longer takes a function pointer, and instead
    assumes option_parse_type().

  * No longer rely on 'type' as a global from within
    option_parse_type(), instead pass it through opt->value. (NB: it is
    never NULL, and thus always safe to *(opt->value).)

Thanks to all who reviewed this series in its many iterations. I am very
happy with how it turned out, and was fortunate to receive feedback and
eventual consensus on the interface.

Thanks,
Taylor

Taylor Blau (2):
  builtin/config.c: treat type specifiers singularly
  builtin/config.c: support `--type=<type>` as preferred alias for
    `--type`

 Documentation/git-config.txt |  71 +++++++++++++-----------
 builtin/config.c             | 102 +++++++++++++++++++++++++----------
 t/t1300-repo-config.sh       |  63 ++++++++++++++++++++++
 3 files changed, 177 insertions(+), 59 deletions(-)

Inter-diff (since v8):

diff --git a/builtin/config.c b/builtin/config.c
index 7184c09582..bd7a8d0ce7 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -61,9 +61,9 @@ static int show_origin;
 #define TYPE_PATH		4
 #define TYPE_EXPIRY_DATE	5

-#define OPT_CALLBACK_VALUE(s, l, h, f, i) \
-	{ OPTION_CALLBACK, (s), (l), NULL, NULL, (h), PARSE_OPT_NOARG | \
-	PARSE_OPT_NONEG, (f), (i) }
+#define OPT_CALLBACK_VALUE(s, l, v, h, i) \
+	{ OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
+	PARSE_OPT_NONEG, option_parse_type, (i) }

 static struct option builtin_config_options[];

@@ -71,7 +71,7 @@ static int option_parse_type(const struct option *opt, const char *arg,
 			     int unset)
 {
 	if (unset) {
-		type = 0;
+		*((int *) opt->value) = 0;
 		return 0;
 	}

@@ -95,7 +95,8 @@ static int option_parse_type(const struct option *opt, const char *arg,
 			die(_("unrecognized --type argument, %s"), arg);
 	}

-	if (type != 0 && type != new_type) {
+	int *to_type = opt->value;
+	if (*to_type && *to_type != new_type) {
 		/*
 		 * Complain when there is a new type not equal to the old type.
 		 * This allows for combinations like '--int --type=int' and
@@ -107,7 +108,7 @@ static int option_parse_type(const struct option *opt, const char *arg,
 		usage_with_options(builtin_config_usage,
 			builtin_config_options);
 	}
-	type = new_type;
+	*to_type = new_type;

 	return 0;
 }
@@ -135,12 +136,12 @@ static struct option builtin_config_options[] = {
 	OPT_BIT(0, "get-color", &actions, N_("find the color configured: slot [default]"), ACTION_GET_COLOR),
 	OPT_BIT(0, "get-colorbool", &actions, N_("find the color setting: slot [stdout-is-tty]"), ACTION_GET_COLORBOOL),
 	OPT_GROUP(N_("Type")),
-	OPT_CALLBACK('t', "type", NULL, "", N_("value is given this type"), option_parse_type),
-	OPT_CALLBACK_VALUE(0, "bool", N_("value is \"true\" or \"false\""), option_parse_type, TYPE_BOOL),
-	OPT_CALLBACK_VALUE(0, "int", N_("value is decimal number"), option_parse_type, TYPE_INT),
-	OPT_CALLBACK_VALUE(0, "bool-or-int", N_("value is --bool or --int"), option_parse_type, TYPE_BOOL_OR_INT),
-	OPT_CALLBACK_VALUE(0, "path", N_("value is a path (file or directory name)"), option_parse_type, TYPE_PATH),
-	OPT_CALLBACK_VALUE(0, "expiry-date", N_("value is an expiry date"), option_parse_type, TYPE_EXPIRY_DATE),
+	OPT_CALLBACK('t', "type", &type, "", N_("value is given this type"), option_parse_type),
+	OPT_CALLBACK_VALUE(0, "bool", &type, N_("value is \"true\" or \"false\""), TYPE_BOOL),
+	OPT_CALLBACK_VALUE(0, "int", &type, N_("value is decimal number"), TYPE_INT),
+	OPT_CALLBACK_VALUE(0, "bool-or-int", &type, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
+	OPT_CALLBACK_VALUE(0, "path", &type, N_("value is a path (file or directory name)"), TYPE_PATH),
+	OPT_CALLBACK_VALUE(0, "expiry-date", &type, N_("value is an expiry date"), TYPE_EXPIRY_DATE),
 	OPT_GROUP(N_("Other")),
 	OPT_BOOL('z', "null", &end_null, N_("terminate values with NUL byte")),
 	OPT_BOOL(0, "name-only", &omit_values, N_("show variable names only")),

--
2.17.0