kconfig: Print reverse dependencies in groups

[carl9170fw.git] / config / expr.c

diff --git a/config/expr.c b/config/expr.c
index f8cb886eef9cabe9be8b6d4b55980c8e010f86eb..49376e12fa303df54ff84caa39863534a32657f5 100644 (file)
--- a/config/expr.c
+++ b/config/expr.c
@@ -94,7 +94,7 @@ struct expr *expr_copy(const struct expr *org)
                e->right.expr = expr_copy(org->right.expr);
                break;
        default:
-               printf("can't copy type %d\n", e->type);
+               fprintf(stderr, "can't copy type %d\n", e->type);
                free(e);
                e = NULL;
                break;
@@ -127,7 +127,7 @@ void expr_free(struct expr *e)
                expr_free(e->right.expr);
                break;
        default:
-               printf("how to free type %d?\n", e->type);
+               fprintf(stderr, "how to free type %d?\n", e->type);
                break;
        }
        free(e);
@@ -1179,7 +1179,9 @@ struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2)
        return expr_get_leftmost_symbol(ret);
 }
 
-void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken)
+void expr_print(struct expr *e,
+               void (*fn)(void *, struct symbol *, const char *),
+               void *data, int prevtoken)
 {
        if (!e) {
                fn(data, NULL, "y");
@@ -1313,3 +1315,33 @@ void expr_gstr_print(struct expr *e, struct gstr *gs)
 {
        expr_print(e, expr_print_gstr_helper, gs, E_NONE);
 }
+
+/*
+ * Transform the top level "||" tokens into newlines and prepend each
+ * line with a minus. This makes expressions much easier to read.
+ * Suitable for reverse dependency expressions.
+ */
+static void expr_print_revdep(struct expr *e,
+                             void (*fn)(void *, struct symbol *, const char *),
+                             void *data, tristate pr_type, const char **title)
+{
+       if (e->type == E_OR) {
+               expr_print_revdep(e->left.expr, fn, data, pr_type, title);
+               expr_print_revdep(e->right.expr, fn, data, pr_type, title);
+       } else if (expr_calc_value(e) == pr_type) {
+               if (*title) {
+                       fn(data, NULL, *title);
+                       *title = NULL;
+               }
+
+               fn(data, NULL, "  - ");
+               expr_print(e, fn, data, E_NONE);
+               fn(data, NULL, "\n");
+       }
+}
+
+void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
+                           tristate pr_type, const char *title)
+{
+       expr_print_revdep(e, expr_print_gstr_helper, gs, pr_type, &title);
+}