[PATCH] kconfig: clean-up reverse dependency help implementation

From: Masahiro Yamada
Date: Tue Feb 20 2018 - 03:20:35 EST


This commit splits out the special E_OR handling ('-' instead of '||')
into a dedicated helper expr_print_revdev().

Restore the original expr_print() prior to commit 1ccb27143360
("kconfig: make "Selected by:" and "Implied by:" readable").

This makes sense because:

- We need to chop those expressions only when printing the reverse
dependency, and only when E_OR is encountered

- Otherwise, it should be printed as before, so fall back to
expr_print()

This also improves the behavior; for a single line, it was previously
displayed in the same line as "Selected by", like this:

Selected by: A [=n] && B [=n]

This will be displayed in a new line, consistently:

Selected by:
- A [=n] && B [=n]

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---

scripts/kconfig/expr.c | 36 +++++++++++++++++++++---------------
scripts/kconfig/menu.c | 6 ++----
2 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index d453819..cd3a8f5 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -1179,7 +1179,9 @@ struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2)
return expr_get_leftmost_symbol(ret);
}

-static void __expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken, bool revdep)
+void expr_print(struct expr *e,
+ void (*fn)(void *, struct symbol *, const char *),
+ void *data, int prevtoken)
{
if (!e) {
fn(data, NULL, "y");
@@ -1234,14 +1236,9 @@ static void __expr_print(struct expr *e, void (*fn)(void *, struct symbol *, con
fn(data, e->right.sym, e->right.sym->name);
break;
case E_OR:
- if (revdep && e->left.expr->type != E_OR)
- fn(data, NULL, "\n - ");
- __expr_print(e->left.expr, fn, data, E_OR, revdep);
- if (revdep)
- fn(data, NULL, "\n - ");
- else
- fn(data, NULL, " || ");
- __expr_print(e->right.expr, fn, data, E_OR, revdep);
+ expr_print(e->left.expr, fn, data, E_OR);
+ fn(data, NULL, " || ");
+ expr_print(e->right.expr, fn, data, E_OR);
break;
case E_AND:
expr_print(e->left.expr, fn, data, E_AND);
@@ -1274,11 +1271,6 @@ static void __expr_print(struct expr *e, void (*fn)(void *, struct symbol *, con
fn(data, NULL, ")");
}

-void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken)
-{
- __expr_print(e, fn, data, prevtoken, false);
-}
-
static void expr_print_file_helper(void *data, struct symbol *sym, const char *str)
{
xfwrite(str, strlen(str), 1, data);
@@ -1329,7 +1321,21 @@ void expr_gstr_print(struct expr *e, struct gstr *gs)
* 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)
+{
+ if (e->type == E_OR) {
+ expr_print_revdep(e->left.expr, fn, data);
+ expr_print_revdep(e->right.expr, fn, data);
+ } else {
+ 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)
{
- __expr_print(e, expr_print_gstr_helper, gs, E_NONE, true);
+ expr_print_revdep(e, expr_print_gstr_helper, gs);
}
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 9922285..7e70be3 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -827,16 +827,14 @@ static void get_symbol_str(struct gstr *r, struct symbol *sym,

get_symbol_props_str(r, sym, P_SELECT, _(" Selects: "));
if (sym->rev_dep.expr) {
- str_append(r, _(" Selected by: "));
+ str_append(r, _(" Selected by: \n"));
expr_gstr_print_revdep(sym->rev_dep.expr, r);
- str_append(r, "\n");
}

get_symbol_props_str(r, sym, P_IMPLY, _(" Implies: "));
if (sym->implied.expr) {
- str_append(r, _(" Implied by: "));
+ str_append(r, _(" Implied by: \n"));
expr_gstr_print_revdep(sym->implied.expr, r);
- str_append(r, "\n");
}

str_append(r, "\n\n");
--
2.7.4