kconfig: add an option to determine a menu's visibility

This option is aimed to add the possibility to control a menu's visibility
without adding dependency to the expression to all the submenu.

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index 184eb6a..e57826c 100644 (file)
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -164,6 +164,7 @@ struct menu {
        struct menu *list;
        struct symbol *sym;
        struct property *prompt;
+       struct expr *visibility;
        struct expr *dep;
        unsigned int flags;
        char *help;

diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 753cdbd..3f7240d 100644 (file)
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -107,6 +107,7 @@ void menu_end_menu(void);
 void menu_add_entry(struct symbol *sym);
 void menu_end_entry(void);
 void menu_add_dep(struct expr *dep);
+void menu_add_visibility(struct expr *dep);
 struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *expr, struct expr *dep);
 struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep);
 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep);

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 7e83aef..b9d9aa1 100644 (file)
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -152,6 +152,12 @@ struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr
        return menu_add_prop(type, prompt, NULL, dep);
 }
 
+void menu_add_visibility(struct expr *expr)
+{
+       current_entry->visibility = expr_alloc_and(current_entry->visibility,
+           expr);
+}
+
 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
 {
        menu_add_prop(type, NULL, expr, dep);
@@ -410,6 +416,11 @@ bool menu_is_visible(struct menu *menu)
        if (!menu->prompt)
                return false;
 
+       if (menu->visibility) {
+               if (expr_calc_value(menu->visibility) == no)
+                       return no;
+       }
+
        sym = menu->sym;
        if (sym) {
                sym_calc_value(sym);

diff --git a/scripts/kconfig/zconf.gperf b/scripts/kconfig/zconf.gperf
index d8bc742..c9e690e 100644 (file)
--- a/scripts/kconfig/zconf.gperf
+++ b/scripts/kconfig/zconf.gperf
@@ -38,6 +38,7 @@ hex,          T_TYPE,         TF_COMMAND, S_HEX
 string,                T_TYPE,         TF_COMMAND, S_STRING
 select,                T_SELECT,       TF_COMMAND
 range,         T_RANGE,        TF_COMMAND
+visible,       T_VISIBLE,      TF_COMMAND
 option,                T_OPTION,       TF_COMMAND
 on,            T_ON,           TF_PARAM
 modules,       T_OPT_MODULES,  TF_OPTION

diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index 2abd3c7..49fb4ab 100644 (file)
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -36,7 +36,7 @@ static struct menu *current_menu, *current_entry;
 #define YYERROR_VERBOSE
 #endif
 %}
-%expect 28
+%expect 30
 
 %union
 {
@@ -68,6 +68,7 @@ static struct menu *current_menu, *current_entry;
 %token <id>T_DEFAULT
 %token <id>T_SELECT
 %token <id>T_RANGE
+%token <id>T_VISIBLE
 %token <id>T_OPTION
 %token <id>T_ON
 %token <string> T_WORD
@@ -123,7 +124,7 @@ stmt_list:
 ;
 
 option_name:
-       T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_OPTIONAL | T_RANGE | T_DEFAULT
+       T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_OPTIONAL | T_RANGE | T_DEFAULT | T_VISIBLE
 ;
 
 common_stmt:
@@ -359,7 +360,7 @@ menu: T_MENU prompt T_EOL
        printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
 };
 
-menu_entry: menu depends_list
+menu_entry: menu visibility_list depends_list
 {
        $$ = menu_add_menu();
 };
@@ -430,6 +431,19 @@ depends: T_DEPENDS T_ON expr T_EOL
        printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
 };
 
+/* visibility option */
+
+visibility_list:
+         /* empty */
+       | visibility_list visible
+       | visibility_list T_EOL
+;
+
+visible: T_VISIBLE if_expr
+{
+       menu_add_visibility($2);
+};
+
 /* prompt statement */
 
 prompt_stmt_opt:
@@ -526,6 +540,7 @@ static const char *zconf_tokenname(int token)
        case T_IF:              return "if";
        case T_ENDIF:           return "endif";
        case T_DEPENDS:         return "depends";
+       case T_VISIBLE:         return "visible";
        }
        return "<token>";
 }