[PATCH v6 2/6] repo: support category requests in repo info

["Eslam reda ragheb via GitGitGadget" <gitgitgadget@gmail.com>]

From: Eslam reda ragheb <eslam.reda.div@gmail.com>

Teach repo info to accept category names (for example, layout)
and expand them to matching key.* entries in request order.

Explicit keys keep their existing behavior; unknown keys or
categories still report clear errors.

Signed-off-by: Eslam reda ragheb <eslam.reda.div@gmail.com>
---
 builtin/repo.c | 38 +++++++++++++++++++++++++++++++++-----
 1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/builtin/repo.c b/builtin/repo.c
index e687d833b4..f614298199 100644
--- a/builtin/repo.c
+++ b/builtin/repo.c
@@ -96,6 +96,33 @@ static get_value_fn *get_value_fn_for_key(const char *key)
 	return found ? found->get_value : NULL;
 }
 
+static void print_field(enum output_format format, const char *key,
+			const char *value);
+
+static int print_category_fields(const char *category,
+				 struct repo_info *info,
+				 enum output_format format,
+				 struct strbuf *valbuf)
+{
+	int found = 0;
+	size_t category_len = strlen(category);
+
+	for (size_t i = 0; i < ARRAY_SIZE(repo_info_fields); i++) {
+		const struct field *field = &repo_info_fields[i];
+
+		if (!starts_with(field->key, category) ||
+		    field->key[category_len] != '.')
+			continue;
+
+		strbuf_reset(valbuf);
+		field->get_value(info, valbuf);
+		print_field(format, field->key, valbuf->buf);
+		found = 1;
+	}
+
+	return found;
+}
+
 static void print_field(enum output_format format, const char *key,
 			const char *value)
 {
@@ -126,14 +153,15 @@ static int print_fields(int argc, const char **argv,
 
 		get_value = get_value_fn_for_key(key);
 
-		if (!get_value) {
-			ret = error(_("key '%s' not found"), key);
+		if (get_value) {
+			strbuf_reset(&valbuf);
+			get_value(info, &valbuf);
+			print_field(format, key, valbuf.buf);
 			continue;
 		}
 
-		strbuf_reset(&valbuf);
-		get_value(info, &valbuf);
-		print_field(format, key, valbuf.buf);
+		if (!print_category_fields(key, info, format, &valbuf))
+			ret = error(_("key '%s' not found"), key);
 	}
 
 	strbuf_release(&valbuf);
-- 
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