[PATCH] kbuild: implement the `mainmenu' directive

[Arnaud Lacombe <lacombar@gmail.com>]

note: the prompt is voluntarily still a bare `const char *'. It may need
to be represented in a more detailled way, say a `struct property'.

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>

---
 scripts/kconfig/lkc.h   |    2 ++
 scripts/kconfig/menu.c  |   23 +++++++++++++++++++++++
 scripts/kconfig/zconf.y |    9 ++++++++-
 3 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index bdf71bd..f00854f 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -94,6 +94,8 @@ static inline void xfwrite(const void *str, size_t len, size_t count, FILE *out)
 void kconfig_load(void);
 
 /* menu.c */
+void mainmenu_set_prompt(char *);
+const char *mainmenu_get_prompt(void);
 void _menu_init(void);
 void menu_warn(struct menu *menu, const char *fmt, ...);
 struct menu *menu_add_menu(void);
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 4fb5902..6aa219e 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -38,6 +38,29 @@ static void prop_warn(struct property *prop, const char *fmt, ...)
 	va_end(ap);
 }
 
+static const char *mainmenu_prompt = NULL;
+
+void mainmenu_set_prompt(char *prompt)
+{
+	if (mainmenu_prompt != NULL)
+		fprintf(stderr, "%s:%d:warning: mainmenu redefined\n",
+		    current_file->name, zconf_lineno());
+
+	if (isspace(*prompt)) {
+		fprintf(stderr, "%s:%d:warning: leading whitespace ignored\n",
+		    current_file->name, zconf_lineno());
+		while (isspace(*prompt))
+			prompt++;
+	}
+
+	mainmenu_prompt = prompt;
+}
+
+const char *mainmenu_get_prompt(void)
+{
+	return mainmenu_prompt;
+}
+
 void _menu_init(void)
 {
 	current_entry = current_menu = &rootmenu;
diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index 23dfd3b..18c9a28 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -111,7 +111,7 @@ stmt_list:
 	| stmt_list common_stmt
 	| stmt_list choice_stmt
 	| stmt_list menu_stmt
-	| stmt_list T_MAINMENU prompt nl
+	| stmt_list mainmenu_stmt
 	| stmt_list end			{ zconf_error("unexpected end statement"); }
 	| stmt_list T_WORD error T_EOL	{ zconf_error("unknown statement \"%s\"", $2); }
 	| stmt_list option_name error T_EOL
@@ -342,6 +342,13 @@ if_block:
 	| if_block choice_stmt
 ;
 
+/* mainmenu entry */
+
+mainmenu_stmt: T_MAINMENU prompt nl
+{
+	mainmenu_set_prompt($2);
+};
+
 /* menu entry */
 
 menu: T_MENU prompt T_EOL
-- 
1.7.2.30.gc37d7.dirty