add an option to extract specified component

src/cli/extract.cpp

@@ -633,7 +633,7 @@ bool print_file_info(const extract_options & o, const setup::info & info) {
 	if(!o.quiet && multiple_sections) {
 		std::cout << '\n';
 	}
-	
+
 	if(o.list_languages) {
 		if(o.silent) {
 			BOOST_FOREACH(const setup::language_entry & language, info.languages) {
@@ -768,7 +768,13 @@ processed_entries filter_entries(const extract_options & o, const setup::info &
 		} else if(o.language_only) {
 			continue; // Ignore language-agnostic dirs
 		}
-		
+
+		if(!directory.components.empty()) {
+			if(!o.component.empty() && !setup::expression_match(o.component, directory.components)) {
+				continue;
+			}
+		}
+
 		std::string path = o.filenames.convert(directory.name);
 		if(path.empty()) {
 			continue; // Don't know what to do with this
@@ -813,7 +819,13 @@ processed_entries filter_entries(const extract_options & o, const setup::info &
 		} else if(o.language_only) {
 			continue; // Ignore language-agnostic files
 		}
-		
+
+		if (!file.components.empty()) {
+			if (!o.component.empty() && !setup::expression_match(o.component, file.components)) {
+				continue;
+			}
+		}
+
 		std::string path = o.filenames.convert(file.destination);
 		if(path.empty()) {
 			continue; // Internal file, not extracted

src/cli/extract.hpp

@@ -77,6 +77,7 @@ struct extract_options {
 	
 	bool extract_unknown; //!< Try to extract unknown Inno Setup versions
 	
+	std::string component; //!< Extract only files for this component
 	bool extract_temp; //!< Extract temporary files
 	bool language_only; //!< Extract files not associated with any language
 	std::string language; //!< Extract only files for this language

src/cli/main.cpp

@@ -165,6 +165,7 @@ int main(int argc, char * argv[]) {
 	
 	po::options_description filter("Filters");
 	filter.add_options()
+		("component", po::value<std::string>(), "Extract only files for this component")
 		("exclude-temp,m", "Don't extract temporary files")
 		("language", po::value<std::string>(), "Extract only files for this language")
 		("language-only", "Only extract language-specific files")
@@ -355,6 +356,12 @@ int main(int argc, char * argv[]) {
 		}
 		o.language_only = (options.count("language-only") != 0);
 	}
+	{
+		po::variables_map::const_iterator i = options.find("component");
+		if(i != options.end()) {
+			o.component = i->second.as<std::string>();
+		}
+	}
 	{
 		po::variables_map::const_iterator i = options.find("include");
 		if(i != options.end()) {