[PATCH v3 1/1] kconfig: menuconfig make "selected by:" readable

[Petr Vorel <pvorel@suse.cz>]

rev_dep expressions can get rather unwieldy, especially if a symbol is
selected by more than a handful of other symbols. Ie, it's possible to
have near endless expressions like:
   A && B && !C || D || F && (G || H) || [...]

Chop these expressions into actually readable chunks:
   - A && B && !C
   - D
   - F && (G || H)
   - [...]

Ie, transform the top level "||" tokens into newlines and prepend each
line with a minus. This makes the "Selected by:" blurb much easier to
read.

This also prevents trimming too long lines.

Based on patch from Paul Bolle.

Reported-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
 scripts/kconfig/expr.c | 16 +++++++++++++---
 scripts/kconfig/menu.c |  2 +-
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index cbf4996dd9c1..4b4309b59349 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -1070,6 +1070,8 @@ struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2)
 	return expr_get_leftmost_symbol(ret);
 }
 
+static int print_level = 0;
+
 void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken)
 {
 	if (!e) {
@@ -1077,8 +1079,11 @@ void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *
 		return;
 	}
 
-	if (expr_compare_type(prevtoken, e->type) > 0)
+	if (expr_compare_type(prevtoken, e->type) > 0) {
+		print_level++;
 		fn(data, NULL, "(");
+	}
+
 	switch (e->type) {
 	case E_SYMBOL:
 		if (e->left.sym->name)
@@ -1126,7 +1131,10 @@ void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *
 		break;
 	case E_OR:
 		expr_print(e->left.expr, fn, data, E_OR);
-		fn(data, NULL, " || ");
+		if (print_level == 0)
+			fn(data, NULL, "\n  - ");
+		else
+			fn(data, NULL, " || ");
 		expr_print(e->right.expr, fn, data, E_OR);
 		break;
 	case E_AND:
@@ -1156,8 +1164,10 @@ void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *
 		break;
 	  }
 	}
-	if (expr_compare_type(prevtoken, e->type) > 0)
+	if (expr_compare_type(prevtoken, e->type) > 0) {
+		print_level--;
 		fn(data, NULL, ")");
+	}
 }
 
 static void expr_print_file_helper(void *data, struct symbol *sym, const char *str)
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index e9357931b47d..3daf7b81637f 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -675,7 +675,7 @@ 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(sym->rev_dep.expr, r);
 		str_append(r, "\n");
 	}
-- 
2.11.0