cam: options: Add support for repeatable options

Add a flag to indicate if an option can be repeatable. If an option is
repeatable it must be accessed thru the array interface, even if it's
only specified once by the user.

Also update the usage generator to indicate which options are
repeatable.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/cam/options.cpp

@@ -97,7 +97,11 @@ bool OptionsBase<T>::parseValue(const T &opt, const Option &option,
 		break;
 	}
 
-	values_[opt] = value;
+	if (option.isArray)
+		values_[opt].addValue(value);
+	else
+		values_[opt] = value;
+
 	return true;
 }
 
@@ -129,7 +133,7 @@ bool KeyValueParser::addOption(const char *name, OptionType type,
 		return false;
 
 	optionsMap_[name] = Option({ 0, type, name, argument, nullptr,
-				     help, nullptr });
+				     help, nullptr, false });
 	return true;
 }
 
@@ -339,7 +343,7 @@ std::vector<OptionValue> OptionValue::toArray() const
 
 bool OptionsParser::addOption(int opt, OptionType type, const char *help,
 			      const char *name, OptionArgument argument,
-			      const char *argumentName)
+			      const char *argumentName, bool array)
 {
 	/*
 	 * Options must have at least a short or long name, and a text message.
@@ -357,16 +361,16 @@ bool OptionsParser::addOption(int opt, OptionType type, const char *help,
 		return false;
 
 	options_.push_back(Option({ opt, type, name, argument, argumentName,
-				    help, nullptr }));
+				    help, nullptr, array }));
 	optionsMap_[opt] = &options_.back();
 	return true;
 }
 
 bool OptionsParser::addOption(int opt, KeyValueParser *parser, const char *help,
-			      const char *name)
+			      const char *name, bool array)
 {
 	if (!addOption(opt, OptionKeyValue, help, name, ArgumentRequired,
-		       "key=value[,key=value,...]"))
+		       "key=value[,key=value,...]", array))
 		return false;
 
 	options_.back().keyValueParser = parser;
@@ -464,6 +468,8 @@ void OptionsParser::usage()
 			length += 1 + strlen(option.argumentName);
 		if (option.argument == ArgumentOptional)
 			length += 2;
+		if (option.isArray)
+			length += 4;
 
 		if (length > indent)
 			indent = length;
@@ -497,6 +503,9 @@ void OptionsParser::usage()
 				argument += "]";
 		}
 
+		if (option.isArray)
+			argument += " ...";
+
 		std::cerr << std::setw(indent) << std::left << argument;
 
 		for (const char *help = option.help, *end = help; end; ) {