Function get_file_attributes

commands.cpp:383–432

returns filter and diff attributes as a pair

// returns filter and diff attributes as a pair
static std::pair<std::string, std::string> get_file_attributes (const std::string& filename)
{
	// git check-attr filter diff -- filename
	std::vector<std::string>	command;
	command.push_back("git");
	command.push_back("check-attr");
	command.push_back("filter");
	command.push_back("diff");
	command.push_back("--");
	command.push_back(filename);

	std::stringstream		output;
	if (!successful_exit(exec_command(command, output))) {
		throw Error("'git check-attr' failed - is this a Git repository?");
	}

	std::string			filter_attr;
	std::string			diff_attr;

	std::string			line;
	// Example output:
	// filename: filter: git-crypt
	// filename: diff: git-crypt
	while (std::getline(output, line)) {
		// filename might contain ": ", so parse line backwards
		// filename: attr_name: attr_value
		//         ^name_pos  ^value_pos
		const std::string::size_type	value_pos(line.rfind(": "));
		if (value_pos == std::string::npos || value_pos == 0) {
			continue;
		}
		const std::string::size_type	name_pos(line.rfind(": ", value_pos - 1));
		if (name_pos == std::string::npos) {
			continue;
		}

		const std::string		attr_name(line.substr(name_pos + 2, value_pos - (name_pos + 2)));
		const std::string		attr_value(line.substr(value_pos + 2));

		if (attr_value != "unspecified" && attr_value != "unset" && attr_value != "set") {
			if (attr_name == "filter") {
				filter_attr = attr_value;
			} else if (attr_name == "diff") {
				diff_attr = attr_value;
			}
		}
	}

	return std::make_pair(filter_attr, diff_attr);
}

// returns filter and diff attributes as a pair
static std::pair<std::string, std::string> get_file_attributes (const std::string& filename, std::ostream& check_attr_stdin, std::istream& check_attr_stdout)