all: few behavioural regression fixes

Wildcard matching with no names should match all packages only for
info and search applet. "apk del" would otherwise try to delete
everything, etc.

Fix also interactive mode to ask questions only if we are actually
changing something.

src/apk_package.h

@@ -42,6 +42,7 @@ struct apk_provider;
 #define APK_DEP_CONFLICTS		0x04
 #define APK_FOREACH_INSTALLED		0x10
 #define APK_FOREACH_MARKED		0x20
+#define APK_FOREACH_NULL_MATCHES_ALL	0x40
 #define APK_FOREACH_GENID_MASK		0xffffff00
 
 struct apk_sign_ctx {

src/commit.c

@@ -259,7 +259,7 @@ int apk_solver_commit_changeset(struct apk_database *db,
 				"disk space will be freed." :
 				"additional disk space will be used.");
 		}
-		if (changeset->changes->num > 0 &&
+		if (changeset->num_total_changes > 0 &&
 		    (apk_flags & APK_INTERACTIVE)) {
 			printf("Do you want to continue [Y/n]? ");
 			fflush(stdout);

src/database.c

@@ -2741,6 +2741,8 @@ void apk_name_foreach_matching(struct apk_database *db, struct apk_string_array
 	};
 
 	if (filter == NULL || filter->num == 0) {
+		if (!(match & APK_FOREACH_NULL_MATCHES_ALL))
+			return;
 		apk_string_array_init(&mctx.filter);
 		goto all;
 	}

src/info.c

@@ -399,7 +399,9 @@ static int info_main(void *ctx, struct apk_database *db, struct apk_string_array
 
 	if (args->num > 0) {
 		/* Print info on given names */
-		apk_name_foreach_matching(db, args, apk_foreach_genid(), print_name_info, ctx);
+		apk_name_foreach_matching(
+			db, args, APK_FOREACH_NULL_MATCHES_ALL | apk_foreach_genid(),
+			print_name_info, ctx);
 	} else {
 		/* Print all installed packages */
 		list_for_each_entry(ipkg, &db->installed.packages, installed_pkgs_list)

src/search.c

@@ -157,7 +157,9 @@ static int search_main(void *pctx, struct apk_database *db, struct apk_string_ar
 			*pmatch = tmp;
 		}
 	}
-	apk_name_foreach_matching(db, args, apk_foreach_genid(), print_result, ctx);
+	apk_name_foreach_matching(
+		db, args, APK_FOREACH_NULL_MATCHES_ALL | apk_foreach_genid(),
+		print_result, ctx);
 	return 0;
 }
 

src/ver.c

@@ -174,7 +174,8 @@ static int ver_main(void *pctx, struct apk_database *db, struct apk_string_array
 	if (apk_verbosity > 0)
 		printf("%-42sAvailable:\n", "Installed:");
 
-	apk_name_foreach_matching(db, args, apk_foreach_genid(),
+	apk_name_foreach_matching(
+		db, args, APK_FOREACH_NULL_MATCHES_ALL | apk_foreach_genid(),
 		ver_print_package_status, ctx);
 
 	return 0;