add experimental support for a new menuconfig submenu "Package features".

allows selection between multiple packages providing the same feature, which affects dependencies of other packages.
will be used e.g. for choosing between DirectFB and X.org for libraries like GTK2

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18056 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/package-dumpinfo.mk

@@ -22,7 +22,7 @@ define Config
   preconfig_$$(1) += $(1)
 endef
 
-define Dumpinfo
+define Dumpinfo/Package
 $(info Package: $(1)
 $(if $(MENU),Menu: $(MENU)
 )$(if $(SUBMENU),Submenu: $(SUBMENU)
@@ -52,4 +52,30 @@ $(Package/$(1)/config)
 )$(foreach pc,$(preconfig_$(1)),
 $(Preconfig/$(pc))))
 endef
+
+define Feature/Default
+  TARGET_NAME:=
+  TARGET_TITLE:=
+  PRIORITY:=
+  NAME:=
+endef
+
+define Feature
+  $(eval $(Feature/Default))
+  $(eval $(Feature/$(1)))
+  $(if $(DUMP),$(call Dumpinfo/Feature,$(1)))
+endef
+
+define Dumpinfo/Feature
+$(info Feature: $(TARGET_NAME)_$(1)
+Target-Name: $(TARGET_NAME)
+Target-Title: $(TARGET_TITLE)
+Feature-Name: $(NAME)
+$(if $(PRIORITY),Feature-Priority: $(PRIORITY)
+)Feature-Description:
+$(Feature/$(1)/description)
+@@
+)
+endef
+
 endif

include/package.mk

@@ -176,7 +176,7 @@ endif
   $(call shexport,Package/$(1)/config)
 
   $(if $(DUMP), \
-    $(Dumpinfo), \
+    $(Dumpinfo/Package), \
     $(foreach target, \
       $(if $(Package/$(1)/targets),$(Package/$(1)/targets), \
         $(if $(PKG_TARGETS),$(PKG_TARGETS), ipkg $(if $(CONFIG_DEBUG_DIR),debug)) \

scripts/metadata.pl

@@ -533,6 +533,30 @@ sub print_package_config_category($) {
 	undef $category{$cat};
 }
 
+sub print_package_features() {
+	keys %features > 0 or return;
+	print "menu \"Package features\"\n";
+	foreach my $n (keys %features) {
+		my @features = sort { $b->{priority} <=> $a->{priority} or $a->{title} cmp $b->{title} } @{$features{$n}};
+		print <<EOF;
+choice
+	prompt "$features[0]->{target_title}"
+	default FEATURE_$features[0]->{name}
+EOF
+
+		foreach my $feature (@features) {
+			print <<EOF;
+	config FEATURE_$feature->{name}
+		bool "$feature->{title}"
+		help
+$feature->{description}
+EOF
+		}
+		print "endchoice\n"
+	}
+	print "endmenu\n\n";
+}
+
 sub gen_package_config() {
 	parse_package_metadata($ARGV[0]) or exit 1;
 	print "menuconfig UCI_PRECONFIG\n\tbool \"Image configuration\"\n" if %preconfig;
@@ -549,6 +573,7 @@ sub gen_package_config() {
 EOF
 		}
 	}
+	print_package_features();
 	print_package_config_category 'Base system';
 	foreach my $cat (keys %category) {
 		print_package_config_category $cat;

scripts/metadata.pm

@@ -2,13 +2,14 @@ package metadata;
 use base 'Exporter';
 use strict;
 use warnings;
-our @EXPORT = qw(%package %srcpackage %category %subdir %preconfig clear_packages parse_package_metadata get_multiline);
+our @EXPORT = qw(%package %srcpackage %category %subdir %preconfig %features clear_packages parse_package_metadata get_multiline);
 
 our %package;
 our %preconfig;
 our %srcpackage;
 our %category;
 our %subdir;
+our %features;
 
 sub get_multiline {
 	my $fh = shift;
@@ -28,11 +29,13 @@ sub clear_packages() {
 	%package = ();
 	%srcpackage = ();
 	%category = ();
+	%features = ();
 }
 
 sub parse_package_metadata($) {
 	my $file = shift;
 	my $pkg;
+	my $feature;
 	my $makefile;
 	my $preconfig;
 	my $subdir;
@@ -55,6 +58,7 @@ sub parse_package_metadata($) {
 		};
 		next unless $src;
 		/^Package:\s*(.+?)\s*$/ and do {
+			undef $feature;
 			$pkg = {};
 			$pkg->{src} = $src;
 			$pkg->{makefile} = $makefile;
@@ -69,6 +73,24 @@ sub parse_package_metadata($) {
 			$package{$1} = $pkg;
 			push @{$srcpackage{$src}}, $pkg;
 		};
+		/^Feature:\s*(.+?)\s*$/ and do {
+			undef $pkg;
+			$feature = {};
+			$feature->{name} = $1;
+			$feature->{priority} = 0;
+		};
+		$feature and do {
+			/^Target-Name:\s*(.+?)\s*$/ and do {
+				$features{$1} or $features{$1} = [];
+				push @{$features{$1}}, $feature;
+			};
+			/^Target-Title:\s*(.+?)\s*$/ and $feature->{target_title} = $1;
+			/^Feature-Priority:\s*(\d+)\s*$/ and $feature->{priority} = $1;
+			/^Feature-Name:\s*(.+?)\s*$/ and $feature->{title} = $1;
+			/^Feature-Description:/ and $feature->{description} = get_multiline(\*FILE, "\t\t\t");
+			next;
+		};
+		next unless $pkg;
 		/^Version: \s*(.+)\s*$/ and $pkg->{version} = $1;
 		/^Title: \s*(.+)\s*$/ and $pkg->{title} = $1;
 		/^Menu: \s*(.+)\s*$/ and $pkg->{menu} = $1;