config/Option: convert to strictly-typed enum

32 files changed, 149 insertions, 128 deletions

diff --git a/src/AudioConfig.cxx b/src/AudioConfig.cxx
index ef1f96ee9..8ee17f301 100644
--- a/src/AudioConfig.cxx
+++ b/src/AudioConfig.cxx
@@ -39,7 +39,7 @@ getOutputAudioFormat(AudioFormat inAudioFormat)
 
 void initAudioConfig(void)
 {
-	const struct config_param *param = config_get_param(CONF_AUDIO_OUTPUT_FORMAT);
+	const struct config_param *param = config_get_param(ConfigOption::AUDIO_OUTPUT_FORMAT);
 
 	if (param == nullptr)
 		return;
diff --git a/src/Listen.cxx b/src/Listen.cxx
index 05a2bdd4d..c360b9650 100644
--- a/src/Listen.cxx
+++ b/src/Listen.cxx
@@ -103,9 +103,9 @@ listen_systemd_activation(Error &error_r)
 bool
 listen_global_init(EventLoop &loop, Partition &partition, Error &error)
 {
-	int port = config_get_positive(CONF_PORT, DEFAULT_PORT);
+	int port = config_get_positive(ConfigOption::PORT, DEFAULT_PORT);
 	const struct config_param *param =
-		config_get_param(CONF_BIND_TO_ADDRESS);
+		config_get_param(ConfigOption::BIND_TO_ADDRESS);
 
 	listen_socket = new ClientListener(loop, partition);
 
diff --git a/src/LogInit.cxx b/src/LogInit.cxx
index b154bcec4..f0f00495f 100644
--- a/src/LogInit.cxx
+++ b/src/LogInit.cxx
@@ -139,14 +139,14 @@ log_init(bool verbose, bool use_stdout, Error &error)
 
 	if (verbose)
 		SetLogThreshold(LogLevel::DEBUG);
-	else if ((param = config_get_param(CONF_LOG_LEVEL)) != nullptr)
+	else if ((param = config_get_param(ConfigOption::LOG_LEVEL)) != nullptr)
 		SetLogThreshold(parse_log_level(param->value.c_str(),
 						param->line));
 
 	if (use_stdout) {
 		return true;
 	} else {
-		param = config_get_param(CONF_LOG_FILE);
+		param = config_get_param(ConfigOption::LOG_FILE);
 		if (param == nullptr) {
 #ifdef HAVE_SYSLOG
 			/* no configuration: default to syslog (if
@@ -164,7 +164,7 @@ log_init(bool verbose, bool use_stdout, Error &error)
 			return true;
 #endif
 		} else {
-			out_path = config_get_path(CONF_LOG_FILE, error);
+			out_path = config_get_path(ConfigOption::LOG_FILE, error);
 			return !out_path.IsNull() &&
 				log_init_file(param->line, error);
 		}
diff --git a/src/Main.cxx b/src/Main.cxx
index c7304f117..9b7679369 100644
--- a/src/Main.cxx
+++ b/src/Main.cxx
@@ -141,12 +141,12 @@ static StateFile *state_file;
 static bool
 glue_daemonize_init(const struct options *options, Error &error)
 {
-	auto pid_file = config_get_path(CONF_PID_FILE, error);
+	auto pid_file = config_get_path(ConfigOption::PID_FILE, error);
 	if (pid_file.IsNull() && error.IsDefined())
 		return false;
 
-	daemonize_init(config_get_string(CONF_USER, nullptr),
-		       config_get_string(CONF_GROUP, nullptr),
+	daemonize_init(config_get_string(ConfigOption::USER, nullptr),
+		       config_get_string(ConfigOption::GROUP, nullptr),
 		       std::move(pid_file));
 
 	if (options->kill)
@@ -160,7 +160,7 @@ glue_daemonize_init(const struct options *options, Error &error)
 static bool
 glue_mapper_init(Error &error)
 {
-	auto playlist_dir = config_get_path(CONF_PLAYLIST_DIR, error);
+	auto playlist_dir = config_get_path(ConfigOption::PLAYLIST_DIR, error);
 	if (playlist_dir.IsNull() && error.IsDefined())
 		return false;
 
@@ -255,7 +255,7 @@ glue_sticker_init(void)
 {
 #ifdef ENABLE_SQLITE
 	Error error;
-	auto sticker_file = config_get_path(CONF_STICKER_FILE, error);
+	auto sticker_file = config_get_path(ConfigOption::STICKER_FILE, error);
 	if (sticker_file.IsNull()) {
 		if (error.IsDefined())
 			FatalError(error);
@@ -270,7 +270,7 @@ glue_sticker_init(void)
 static bool
 glue_state_file_init(Error &error)
 {
-	auto path_fs = config_get_path(CONF_STATE_FILE, error);
+	auto path_fs = config_get_path(ConfigOption::STATE_FILE, error);
 	if (path_fs.IsNull()) {
 		if (error.IsDefined())
 			return false;
@@ -286,8 +286,9 @@ glue_state_file_init(Error &error)
 #endif
 	}
 
-	unsigned interval = config_get_unsigned(CONF_STATE_FILE_INTERVAL,
-						StateFile::DEFAULT_INTERVAL);
+	const unsigned interval =
+		config_get_unsigned(ConfigOption::STATE_FILE_INTERVAL,
+				    StateFile::DEFAULT_INTERVAL);
 
 	state_file = new StateFile(std::move(path_fs), interval,
 				   *instance->partition,
@@ -324,7 +325,7 @@ initialize_decoder_and_player(void)
 	const struct config_param *param;
 
 	size_t buffer_size;
-	param = config_get_param(CONF_AUDIO_BUFFER_SIZE);
+	param = config_get_param(ConfigOption::AUDIO_BUFFER_SIZE);
 	if (param != nullptr) {
 		char *test;
 		long tmp = strtol(param->value.c_str(), &test, 10);
@@ -345,7 +346,7 @@ initialize_decoder_and_player(void)
 				 (unsigned long)buffer_size);
 
 	float perc;
-	param = config_get_param(CONF_BUFFER_BEFORE_PLAY);
+	param = config_get_param(ConfigOption::BUFFER_BEFORE_PLAY);
 	if (param != nullptr) {
 		char *test;
 		perc = strtod(param->value.c_str(), &test);
@@ -363,7 +364,7 @@ initialize_decoder_and_player(void)
 		buffered_before_play = buffered_chunks;
 
 	const unsigned max_length =
-		config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
+		config_get_positive(ConfigOption::MAX_PLAYLIST_LENGTH,
 				    DEFAULT_PLAYLIST_MAX_LENGTH);
 
 	instance->partition = new Partition(*instance,
@@ -503,7 +504,8 @@ int mpd_main(int argc, char *argv[])
 	}
 #endif
 
-	const unsigned max_clients = config_get_positive(CONF_MAX_CONN, 10);
+	const unsigned max_clients =
+		config_get_positive(ConfigOption::MAX_CONN, 10);
 	instance->client_list = new ClientList(max_clients);
 
 	initialize_decoder_and_player();
@@ -630,14 +632,14 @@ static int mpd_main_after_fork(struct options options)
 	instance->partition->outputs.SetReplayGainMode(replay_gain_get_real_mode(instance->partition->playlist.queue.random));
 
 #ifdef ENABLE_DATABASE
-	if (config_get_bool(CONF_AUTO_UPDATE, false)) {
+	if (config_get_bool(ConfigOption::AUTO_UPDATE, false)) {
 #ifdef ENABLE_INOTIFY
 		if (instance->storage != nullptr &&
 		    instance->update != nullptr)
 			mpd_inotify_init(*instance->event_loop,
 					 *instance->storage,
 					 *instance->update,
-					 config_get_unsigned(CONF_AUTO_UPDATE_DEPTH,
+					 config_get_unsigned(ConfigOption::AUTO_UPDATE_DEPTH,
 							     INT_MAX));
 #else
 		FormatWarning(main_domain,
diff --git a/src/Permission.cxx b/src/Permission.cxx
index c14830ac7..b6ff39bdb 100644
--- a/src/Permission.cxx
+++ b/src/Permission.cxx
@@ -92,7 +92,7 @@ void initPermissions(void)
 	permission_default = PERMISSION_READ | PERMISSION_ADD |
 	    PERMISSION_CONTROL | PERMISSION_ADMIN;
 
-	param = config_get_param(CONF_PASSWORD);
+	param = config_get_param(ConfigOption::PASSWORD);
 
 	if (param) {
 		permission_default = 0;
@@ -118,7 +118,7 @@ void initPermissions(void)
 		} while ((param = param->next) != nullptr);
 	}
 
-	param = config_get_param(CONF_DEFAULT_PERMS);
+	param = config_get_param(ConfigOption::DEFAULT_PERMS);
 
 	if (param)
 		permission_default = parsePermissions(param->value.c_str());
diff --git a/src/PlaylistFile.cxx b/src/PlaylistFile.cxx
index 65974fb55..f77d1930f 100644
--- a/src/PlaylistFile.cxx
+++ b/src/PlaylistFile.cxx
@@ -53,11 +53,12 @@ bool playlist_saveAbsolutePaths = DEFAULT_PLAYLIST_SAVE_ABSOLUTE_PATHS;
 void
 spl_global_init(void)
 {
-	playlist_max_length = config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
-						  DEFAULT_PLAYLIST_MAX_LENGTH);
+	playlist_max_length =
+		config_get_positive(ConfigOption::MAX_PLAYLIST_LENGTH,
+				    DEFAULT_PLAYLIST_MAX_LENGTH);
 
 	playlist_saveAbsolutePaths =
-		config_get_bool(CONF_SAVE_ABSOLUTE_PATHS,
+		config_get_bool(ConfigOption::SAVE_ABSOLUTE_PATHS,
 				DEFAULT_PLAYLIST_SAVE_ABSOLUTE_PATHS);
 }
 
diff --git a/src/ReplayGainConfig.cxx b/src/ReplayGainConfig.cxx
index 8d1f83404..b8a907cdc 100644
--- a/src/ReplayGainConfig.cxx
+++ b/src/ReplayGainConfig.cxx
@@ -81,7 +81,8 @@ replay_gain_set_mode_string(const char *p)
 
 void replay_gain_global_init(void)
 {
-	const struct config_param *param = config_get_param(CONF_REPLAYGAIN);
+	const struct config_param *param =
+		config_get_param(ConfigOption::REPLAYGAIN);
 
 	if (param != nullptr &&
 	    !replay_gain_set_mode_string(param->value.c_str())) {
@@ -89,7 +90,7 @@ void replay_gain_global_init(void)
 				 param->value.c_str(), param->line);
 	}
 
-	param = config_get_param(CONF_REPLAYGAIN_PREAMP);
+	param = config_get_param(ConfigOption::REPLAYGAIN_PREAMP);
 
 	if (param) {
 		char *test;
@@ -110,7 +111,7 @@ void replay_gain_global_init(void)
 		replay_gain_preamp = pow(10, f / 20.0);
 	}
 
-	param = config_get_param(CONF_REPLAYGAIN_MISSING_PREAMP);
+	param = config_get_param(ConfigOption::REPLAYGAIN_MISSING_PREAMP);
 
 	if (param) {
 		char *test;
@@ -131,7 +132,8 @@ void replay_gain_global_init(void)
 		replay_gain_missing_preamp = pow(10, f / 20.0);
 	}
 
-	replay_gain_limit = config_get_bool(CONF_REPLAYGAIN_LIMIT, DEFAULT_REPLAYGAIN_LIMIT);
+	replay_gain_limit = config_get_bool(ConfigOption::REPLAYGAIN_LIMIT,
+					    DEFAULT_REPLAYGAIN_LIMIT);
 }
 
 ReplayGainMode
diff --git a/src/client/ClientGlobal.cxx b/src/client/ClientGlobal.cxx
index b084839bc..078fd0981 100644
--- a/src/client/ClientGlobal.cxx
+++ b/src/client/ClientGlobal.cxx
@@ -31,15 +31,15 @@ size_t client_max_output_buffer_size;
 
 void client_manager_init(void)
 {
-	client_timeout = config_get_positive(CONF_CONN_TIMEOUT,
+	client_timeout = config_get_positive(ConfigOption::CONN_TIMEOUT,
 					     CLIENT_TIMEOUT_DEFAULT);
 	client_max_command_list_size =
-		config_get_positive(CONF_MAX_COMMAND_LIST_SIZE,
+		config_get_positive(ConfigOption::MAX_COMMAND_LIST_SIZE,
 				    CLIENT_MAX_COMMAND_LIST_DEFAULT / 1024)
 		* 1024;
 
 	client_max_output_buffer_size =
-		config_get_positive(CONF_MAX_OUTPUT_BUFFER_SIZE,
+		config_get_positive(ConfigOption::MAX_OUTPUT_BUFFER_SIZE,
 				    CLIENT_MAX_OUTPUT_BUFFER_SIZE_DEFAULT / 1024)
 		* 1024;
 }
diff --git a/src/config/ConfigFile.cxx b/src/config/ConfigFile.cxx
index 258482db9..e3b47bae6 100644
--- a/src/config/ConfigFile.cxx
+++ b/src/config/ConfigFile.cxx
@@ -175,7 +175,7 @@ ReadConfigFile(ConfigData &config_data, FILE *fp, Error &error)
 		   "repeatable" flag */
 
 		const ConfigOption o = ParseConfigOptionName(name);
-		if (o == CONF_MAX) {
+		if (o == ConfigOption::MAX) {
 			error.Format(config_file_domain,
 				     "unrecognized parameter in config file at "
 				     "line %i: %s\n", count, name);
diff --git a/src/config/ConfigOption.hxx b/src/config/ConfigOption.hxx
index 1c177acf0..c3f4c9aad 100644
--- a/src/config/ConfigOption.hxx
+++ b/src/config/ConfigOption.hxx
@@ -22,68 +22,78 @@
 
 #include "Compiler.h"
 
-enum ConfigOption {
-	CONF_MUSIC_DIR,
-	CONF_PLAYLIST_DIR,
-	CONF_FOLLOW_INSIDE_SYMLINKS,
-	CONF_FOLLOW_OUTSIDE_SYMLINKS,
-	CONF_DB_FILE,
-	CONF_STICKER_FILE,
-	CONF_LOG_FILE,
-	CONF_PID_FILE,
-	CONF_STATE_FILE,
-	CONF_STATE_FILE_INTERVAL,
-	CONF_RESTORE_PAUSED,
-	CONF_USER,
-	CONF_GROUP,
-	CONF_BIND_TO_ADDRESS,
-	CONF_PORT,
-	CONF_LOG_LEVEL,
-	CONF_ZEROCONF_NAME,
-	CONF_ZEROCONF_ENABLED,
-	CONF_PASSWORD,
-	CONF_DEFAULT_PERMS,
-	CONF_AUDIO_OUTPUT,
-	CONF_AUDIO_OUTPUT_FORMAT,
-	CONF_MIXER_TYPE,
-	CONF_REPLAYGAIN,
-	CONF_REPLAYGAIN_PREAMP,
-	CONF_REPLAYGAIN_MISSING_PREAMP,
-	CONF_REPLAYGAIN_LIMIT,
-	CONF_VOLUME_NORMALIZATION,
-	CONF_SAMPLERATE_CONVERTER,
-	CONF_AUDIO_BUFFER_SIZE,
-	CONF_BUFFER_BEFORE_PLAY,
-	CONF_HTTP_PROXY_HOST,
-	CONF_HTTP_PROXY_PORT,
-	CONF_HTTP_PROXY_USER,
-	CONF_HTTP_PROXY_PASSWORD,
-	CONF_CONN_TIMEOUT,
-	CONF_MAX_CONN,
-	CONF_MAX_PLAYLIST_LENGTH,
-	CONF_MAX_COMMAND_LIST_SIZE,
-	CONF_MAX_OUTPUT_BUFFER_SIZE,
-	CONF_FS_CHARSET,
-	CONF_ID3V1_ENCODING,
-	CONF_METADATA_TO_USE,
-	CONF_SAVE_ABSOLUTE_PATHS,
-	CONF_DECODER,
-	CONF_INPUT,
-	CONF_GAPLESS_MP3_PLAYBACK,
-	CONF_PLAYLIST_PLUGIN,
-	CONF_AUTO_UPDATE,
-	CONF_AUTO_UPDATE_DEPTH,
-	CONF_DESPOTIFY_USER,
-	CONF_DESPOTIFY_PASSWORD,
-	CONF_DESPOTIFY_HIGH_BITRATE,
-	CONF_AUDIO_FILTER,
-	CONF_DATABASE,
-	CONF_NEIGHBORS,
-	CONF_MAX
+#if defined(WIN32) && CLANG_OR_GCC_VERSION(4,7)
+/* "INPUT" is declared by winuser.h */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshadow"
+#endif
+
+enum class ConfigOption {
+	MUSIC_DIR,
+	PLAYLIST_DIR,
+	FOLLOW_INSIDE_SYMLINKS,
+	FOLLOW_OUTSIDE_SYMLINKS,
+	DB_FILE,
+	STICKER_FILE,
+	LOG_FILE,
+	PID_FILE,
+	STATE_FILE,
+	STATE_FILE_INTERVAL,
+	RESTORE_PAUSED,
+	USER,
+	GROUP,
+	BIND_TO_ADDRESS,
+	PORT,
+	LOG_LEVEL,
+	ZEROCONF_NAME,
+	ZEROCONF_ENABLED,
+	PASSWORD,
+	DEFAULT_PERMS,
+	AUDIO_OUTPUT,
+	AUDIO_OUTPUT_FORMAT,
+	MIXER_TYPE,
+	REPLAYGAIN,
+	REPLAYGAIN_PREAMP,
+	REPLAYGAIN_MISSING_PREAMP,
+	REPLAYGAIN_LIMIT,
+	VOLUME_NORMALIZATION,
+	SAMPLERATE_CONVERTER,
+	AUDIO_BUFFER_SIZE,
+	BUFFER_BEFORE_PLAY,
+	HTTP_PROXY_HOST,
+	HTTP_PROXY_PORT,
+	HTTP_PROXY_USER,
+	HTTP_PROXY_PASSWORD,
+	CONN_TIMEOUT,
+	MAX_CONN,
+	MAX_PLAYLIST_LENGTH,
+	MAX_COMMAND_LIST_SIZE,
+	MAX_OUTPUT_BUFFER_SIZE,
+	FS_CHARSET,
+	ID3V1_ENCODING,
+	METADATA_TO_USE,
+	SAVE_ABSOLUTE_PATHS,
+	DECODER,
+	INPUT,
+	GAPLESS_MP3_PLAYBACK,
+	PLAYLIST_PLUGIN,
+	AUTO_UPDATE,
+	AUTO_UPDATE_DEPTH,
+	DESPOTIFY_USER,
+	DESPOTIFY_PASSWORD,
+	DESPOTIFY_HIGH_BITRATE,
+	AUDIO_FILTER,
+	DATABASE,
+	NEIGHBORS,
+	MAX
 };
 
+#if defined(WIN32) && CLANG_OR_GCC_VERSION(4,7)
+#pragma GCC diagnostic pop
+#endif
+
 /**
- * @return #CONF_MAX if not found
+ * @return #ConfigOption::MAX if not found
  */
 gcc_pure
 enum ConfigOption
diff --git a/src/config/ConfigPath.cxx b/src/config/ConfigPath.cxx
index c10b3a1d5..fe42fdf60 100644
--- a/src/config/ConfigPath.cxx
+++ b/src/config/ConfigPath.cxx
@@ -70,7 +70,7 @@ GetHome(Error &error)
 static AllocatedPath
 GetConfiguredHome(Error &error)
 {
-	const char *user = config_get_string(CONF_USER, nullptr);
+	const char *user = config_get_string(ConfigOption::USER, nullptr);
 	return user != nullptr
 		? GetHome(user, error)
 		: GetHome(error);
diff --git a/src/config/ConfigTemplates.cxx b/src/config/ConfigTemplates.cxx
index 1949a5ff1..8f01d4104 100644
--- a/src/config/ConfigTemplates.cxx
+++ b/src/config/ConfigTemplates.cxx
@@ -84,7 +84,7 @@ const ConfigTemplate config_templates[] = {
 
 static constexpr unsigned n_config_templates = ARRAY_SIZE(config_templates);
 
-static_assert(n_config_templates == unsigned(CONF_MAX),
+static_assert(n_config_templates == unsigned(ConfigOption::MAX),
 	      "Wrong number of config_templates");
 
 ConfigOption
@@ -94,5 +94,5 @@ ParseConfigOptionName(const char *name)
 		if (strcmp(config_templates[i].name, name) == 0)
 			return ConfigOption(i);
 
-	return CONF_MAX;
+	return ConfigOption::MAX;
 }
diff --git a/src/config/Data.hxx b/src/config/Data.hxx
index af1da956f..56e7d2553 100644
--- a/src/config/Data.hxx
+++ b/src/config/Data.hxx
@@ -27,7 +27,7 @@
 struct config_param;
 
 struct ConfigData {
-	std::array<config_param *, std::size_t(CONF_MAX)> params;
+	std::array<config_param *, std::size_t(ConfigOption::MAX)> params;
 
 	void Clear();
 };
diff --git a/src/db/Configured.cxx b/src/db/Configured.cxx
index 7bdd10b56..5d53e5951 100644
--- a/src/db/Configured.cxx
+++ b/src/db/Configured.cxx
@@ -32,8 +32,8 @@ Database *
 CreateConfiguredDatabase(EventLoop &loop, DatabaseListener &listener,
 			 Error &error)
 {
-	const struct config_param *param = config_get_param(CONF_DATABASE);
-	const struct config_param *path = config_get_param(CONF_DB_FILE);
+	const auto *param = config_get_param(ConfigOption::DATABASE);
+	const auto *path = config_get_param(ConfigOption::DB_FILE);
 
 	if (param != nullptr && path != nullptr) {
 		error.Format(config_domain,
diff --git a/src/db/update/Walk.cxx b/src/db/update/Walk.cxx
index b1aa4af6a..6442e6d23 100644
--- a/src/db/update/Walk.cxx
+++ b/src/db/update/Walk.cxx
@@ -57,11 +57,11 @@ UpdateWalk::UpdateWalk(EventLoop &_loop, DatabaseListener &_listener,
 {
 #ifndef WIN32
 	follow_inside_symlinks =
-		config_get_bool(CONF_FOLLOW_INSIDE_SYMLINKS,
+		config_get_bool(ConfigOption::FOLLOW_INSIDE_SYMLINKS,
 				DEFAULT_FOLLOW_INSIDE_SYMLINKS);
 
 	follow_outside_symlinks =
-		config_get_bool(CONF_FOLLOW_OUTSIDE_SYMLINKS,
+		config_get_bool(ConfigOption::FOLLOW_OUTSIDE_SYMLINKS,
 				DEFAULT_FOLLOW_OUTSIDE_SYMLINKS);
 #endif
 }
diff --git a/src/decoder/DecoderList.cxx b/src/decoder/DecoderList.cxx
index c5b8ff5fb..56cc83eba 100644
--- a/src/decoder/DecoderList.cxx
+++ b/src/decoder/DecoderList.cxx
@@ -132,7 +132,8 @@ void decoder_plugin_init_all(void)
 	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i) {
 		const DecoderPlugin &plugin = *decoder_plugins[i];
 		const struct config_param *param =
-			config_find_block(CONF_DECODER, "plugin", plugin.name);
+			config_find_block(ConfigOption::DECODER, "plugin",
+					  plugin.name);
 
 		if (param == nullptr)
 			param = &empty;
diff --git a/src/decoder/plugins/MadDecoderPlugin.cxx b/src/decoder/plugins/MadDecoderPlugin.cxx
index 07e9bd02b..6e6feabc1 100644
--- a/src/decoder/plugins/MadDecoderPlugin.cxx
+++ b/src/decoder/plugins/MadDecoderPlugin.cxx
@@ -109,7 +109,7 @@ mad_fixed_to_24_buffer(int32_t *dest, const struct mad_synth *synth,
 static bool
 mp3_plugin_init(gcc_unused const config_param &param)
 {
-	gapless_playback = config_get_bool(CONF_GAPLESS_MP3_PLAYBACK,
+	gapless_playback = config_get_bool(ConfigOption::GAPLESS_MP3_PLAYBACK,
 					   DEFAULT_GAPLESS_MP3_PLAYBACK);
 	return true;
 }
diff --git a/src/filter/FilterConfig.cxx b/src/filter/FilterConfig.cxx
index 6ceecd581..be2547751 100644
--- a/src/filter/FilterConfig.cxx
+++ b/src/filter/FilterConfig.cxx
@@ -35,7 +35,8 @@ static bool
 filter_chain_append_new(Filter &chain, const char *template_name, Error &error)
 {
 	const struct config_param *cfg =
-		config_find_block(CONF_AUDIO_FILTER, "name", template_name);
+		config_find_block(ConfigOption::AUDIO_FILTER, "name",
+				  template_name);
 	if (cfg == nullptr) {
 		error.Format(config_domain,
 			     "filter template not found: %s",
diff --git a/src/fs/Config.cxx b/src/fs/Config.cxx
index 6975152ca..623736c54 100644
--- a/src/fs/Config.cxx
+++ b/src/fs/Config.cxx
@@ -35,7 +35,7 @@ ConfigureFS(Error &error)
 #ifdef HAVE_FS_CHARSET
 	const char *charset = nullptr;
 
-	charset = config_get_string(CONF_FS_CHARSET, nullptr);
+	charset = config_get_string(ConfigOption::FS_CHARSET, nullptr);
 	if (charset == nullptr) {
 #ifdef WIN32
 		/* Glib claims that file system encoding is always utf-8
diff --git a/src/input/Init.cxx b/src/input/Init.cxx
index 9fbef934e..0debf6d43 100644
--- a/src/input/Init.cxx
+++ b/src/input/Init.cxx
@@ -43,7 +43,8 @@ input_stream_global_init(Error &error)
 		assert(plugin->open != nullptr);
 
 		const struct config_param *param =
-			config_find_block(CONF_INPUT, "plugin", plugin->name);
+			config_find_block(ConfigOption::INPUT, "plugin",
+					  plugin->name);
 		if (param == nullptr) {
 			param = &empty;
 		} else if (!param->GetBlockValue("enabled", true))
diff --git a/src/input/plugins/CurlInputPlugin.cxx b/src/input/plugins/CurlInputPlugin.cxx
index 114f03f3c..bdfcaf647 100644
--- a/src/input/plugins/CurlInputPlugin.cxx
+++ b/src/input/plugins/CurlInputPlugin.cxx
@@ -564,10 +564,10 @@ input_curl_init(const config_param &param, Error &error)
 
 	if (proxy == nullptr) {
 		/* deprecated proxy configuration */
-		proxy = config_get_string(CONF_HTTP_PROXY_HOST, nullptr);
-		proxy_port = config_get_positive(CONF_HTTP_PROXY_PORT, 0);
-		proxy_user = config_get_string(CONF_HTTP_PROXY_USER, nullptr);
-		proxy_password = config_get_string(CONF_HTTP_PROXY_PASSWORD,
+		proxy = config_get_string(ConfigOption::HTTP_PROXY_HOST, nullptr);
+		proxy_port = config_get_positive(ConfigOption::HTTP_PROXY_PORT, 0);
+		proxy_user = config_get_string(ConfigOption::HTTP_PROXY_USER, nullptr);
+		proxy_password = config_get_string(ConfigOption::HTTP_PROXY_PASSWORD,
 						   "");
 	}
 
diff --git a/src/lib/despotify/DespotifyUtils.cxx b/src/lib/despotify/DespotifyUtils.cxx
index e62994c6a..c72715ace 100644
--- a/src/lib/despotify/DespotifyUtils.cxx
+++ b/src/lib/despotify/DespotifyUtils.cxx
@@ -124,9 +124,9 @@ mpd_despotify_get_session()
 		return g_session;
 
 	const char *const user =
-		config_get_string(CONF_DESPOTIFY_USER, nullptr);
+		config_get_string(ConfigOption::DESPOTIFY_USER, nullptr);
 	const char *const passwd =
-		config_get_string(CONF_DESPOTIFY_PASSWORD, nullptr);
+		config_get_string(ConfigOption::DESPOTIFY_PASSWORD, nullptr);
 
 	if (user == nullptr || passwd == nullptr) {
 		LogDebug(despotify_domain,
@@ -140,7 +140,7 @@ mpd_despotify_get_session()
 	}
 
 	const bool high_bitrate =
-		config_get_bool(CONF_DESPOTIFY_HIGH_BITRATE, true);
+		config_get_bool(ConfigOption::DESPOTIFY_HIGH_BITRATE, true);
 	g_session = despotify_init_client(callback, nullptr,
 					  high_bitrate, true);
 	if (!g_session) {
diff --git a/src/neighbor/Glue.cxx b/src/neighbor/Glue.cxx
index e5d67f962..57383b1d5 100644
--- a/src/neighbor/Glue.cxx
+++ b/src/neighbor/Glue.cxx
@@ -59,7 +59,7 @@ CreateNeighborExplorer(EventLoop &loop, NeighborListener &listener,
 bool
 NeighborGlue::Init(EventLoop &loop, NeighborListener &listener, Error &error)
 {
-	for (const config_param *param = config_get_param(CONF_NEIGHBORS);
+	for (const auto *param = config_get_param(ConfigOption::NEIGHBORS);
 	     param != nullptr; param = param->next) {
 		NeighborExplorer *explorer =
 			CreateNeighborExplorer(loop, listener, *param, error);
diff --git a/src/output/Init.cxx b/src/output/Init.cxx
index 4a1217196..c4e4a1880 100644
--- a/src/output/Init.cxx
+++ b/src/output/Init.cxx
@@ -108,7 +108,7 @@ audio_output_mixer_type(const config_param &param)
 
 	/* fall back to the global "mixer_type" setting (also
 	   deprecated) */
-	return mixer_type_parse(config_get_string(CONF_MIXER_TYPE,
+	return mixer_type_parse(config_get_string(ConfigOption::MIXER_TYPE,
 						  "hardware"));
 }
 
@@ -191,7 +191,7 @@ AudioOutput::Configure(const config_param &param, Error &error)
 
 	/* create the normalization filter (if configured) */
 
-	if (config_get_bool(CONF_VOLUME_NORMALIZATION, false)) {
+	if (config_get_bool(ConfigOption::VOLUME_NORMALIZATION, false)) {
 		Filter *normalize_filter =
 			filter_new(&normalize_filter_plugin, config_param(),
 				   IgnoreError());
diff --git a/src/output/MultipleOutputs.cxx b/src/output/MultipleOutputs.cxx
index ba4423f77..83a8b98c9 100644
--- a/src/output/MultipleOutputs.cxx
+++ b/src/output/MultipleOutputs.cxx
@@ -74,7 +74,7 @@ LoadOutput(EventLoop &event_loop, MixerListener &mixer_listener,
 void
 MultipleOutputs::Configure(EventLoop &event_loop, PlayerControl &pc)
 {
-	for (const config_param *param = config_get_param(CONF_AUDIO_OUTPUT);
+	for (const auto *param = config_get_param(ConfigOption::AUDIO_OUTPUT);
 	     param != nullptr; param = param->next) {
 		auto output = LoadOutput(event_loop, mixer_listener,
 					 pc, *param);
diff --git a/src/pcm/ConfiguredResampler.cxx b/src/pcm/ConfiguredResampler.cxx
index db1f8d526..bf6ea58ee 100644
--- a/src/pcm/ConfiguredResampler.cxx
+++ b/src/pcm/ConfiguredResampler.cxx
@@ -53,7 +53,7 @@ bool
 pcm_resampler_global_init(Error &error)
 {
 	const char *converter =
-		config_get_string(CONF_SAMPLERATE_CONVERTER, "");
+		config_get_string(ConfigOption::SAMPLERATE_CONVERTER, "");
 
 	if (strcmp(converter, "internal") == 0)
 		return true;
diff --git a/src/playlist/PlaylistRegistry.cxx b/src/playlist/PlaylistRegistry.cxx
index a1c0cd37a..a5a5319fc 100644
--- a/src/playlist/PlaylistRegistry.cxx
+++ b/src/playlist/PlaylistRegistry.cxx
@@ -81,9 +81,9 @@ playlist_list_global_init(void)
 
 	for (unsigned i = 0; playlist_plugins[i] != nullptr; ++i) {
 		const struct playlist_plugin *plugin = playlist_plugins[i];
-		const struct config_param *param =
-			config_find_block(CONF_PLAYLIST_PLUGIN, "name",
-					  plugin->name);
+		const auto *param =
+			config_find_block(ConfigOption::PLAYLIST_PLUGIN,
+					  "name", plugin->name);
 		if (param == nullptr)
 			param = &empty;
 		else if (!param->GetBlockValue("enabled", true))
diff --git a/src/queue/PlaylistState.cxx b/src/queue/PlaylistState.cxx
index b19a948e4..c2dbd02b5 100644
--- a/src/queue/PlaylistState.cxx
+++ b/src/queue/PlaylistState.cxx
@@ -195,7 +195,7 @@ playlist_state_restore(const char *line, TextFile &file,
 			current = 0;
 
 		if (state == PlayerState::PLAY &&
-		    config_get_bool(CONF_RESTORE_PAUSED, false))
+		    config_get_bool(ConfigOption::RESTORE_PAUSED, false))
 			/* the user doesn't want MPD to auto-start
 			   playback after startup; fall back to
 			   "pause" */
diff --git a/src/storage/Configured.cxx b/src/storage/Configured.cxx
index b0585c750..adb5c7dc5 100644
--- a/src/storage/Configured.cxx
+++ b/src/storage/Configured.cxx
@@ -44,7 +44,7 @@ CreateConfiguredStorageUri(EventLoop &event_loop, const char *uri,
 static AllocatedPath
 GetConfiguredMusicDirectory(Error &error)
 {
-	AllocatedPath path = config_get_path(CONF_MUSIC_DIR, error);
+	AllocatedPath path = config_get_path(ConfigOption::MUSIC_DIR, error);
 	if (path.IsNull() && !error.IsDefined())
 		path = GetUserMusicDir();
 
@@ -68,7 +68,7 @@ CreateConfiguredStorage(EventLoop &event_loop, Error &error)
 {
 	assert(!error.IsDefined());
 
-	auto uri = config_get_string(CONF_MUSIC_DIR, nullptr);
+	auto uri = config_get_string(ConfigOption::MUSIC_DIR, nullptr);
 	if (uri != nullptr && uri_has_scheme(uri))
 		return CreateConfiguredStorageUri(event_loop, uri, error);
 
@@ -78,5 +78,5 @@ CreateConfiguredStorage(EventLoop &event_loop, Error &error)
 bool
 IsStorageConfigured()
 {
-	return config_get_string(CONF_MUSIC_DIR, nullptr) != nullptr;
+	return config_get_string(ConfigOption::MUSIC_DIR, nullptr) != nullptr;
 }
diff --git a/src/tag/TagConfig.cxx b/src/tag/TagConfig.cxx
index 49e6105cc..df40c2bc0 100644
--- a/src/tag/TagConfig.cxx
+++ b/src/tag/TagConfig.cxx
@@ -35,7 +35,8 @@
 void
 TagLoadConfig()
 {
-	const char *value = config_get_string(CONF_METADATA_TO_USE, nullptr);
+	const char *value = config_get_string(ConfigOption::METADATA_TO_USE,
+					      nullptr);
 	if (value == nullptr)
 		return;
 
diff --git a/src/tag/TagId3.cxx b/src/tag/TagId3.cxx
index 2d64924d3..ade1fd007 100644
--- a/src/tag/TagId3.cxx
+++ b/src/tag/TagId3.cxx
@@ -99,7 +99,8 @@ import_id3_string(bool is_id3v1, const id3_ucs4_t *ucs4)
 	/* use encoding field here? */
 	const char *encoding;
 	if (is_id3v1 &&
-	    (encoding = config_get_string(CONF_ID3V1_ENCODING, nullptr)) != nullptr) {
+	    (encoding = config_get_string(ConfigOption::ID3V1_ENCODING,
+					  nullptr)) != nullptr) {
 		id3_latin1_t *isostr = id3_ucs4_latin1duplicate(ucs4);
 		if (gcc_unlikely(isostr == nullptr))
 			return nullptr;
diff --git a/src/zeroconf/ZeroconfGlue.cxx b/src/zeroconf/ZeroconfGlue.cxx
index 499b55000..f00395e7c 100644
--- a/src/zeroconf/ZeroconfGlue.cxx
+++ b/src/zeroconf/ZeroconfGlue.cxx
@@ -44,7 +44,7 @@ ZeroconfInit(gcc_unused EventLoop &loop)
 {
 	const char *serviceName;
 
-	zeroconfEnabled = config_get_bool(CONF_ZEROCONF_ENABLED,
+	zeroconfEnabled = config_get_bool(ConfigOption::ZEROCONF_ENABLED,
 					  DEFAULT_ZEROCONF_ENABLED);
 	if (!zeroconfEnabled)
 		return;
@@ -56,7 +56,8 @@ ZeroconfInit(gcc_unused EventLoop &loop)
 		return;
 	}
 
-	serviceName = config_get_string(CONF_ZEROCONF_NAME, SERVICE_NAME);
+	serviceName = config_get_string(ConfigOption::ZEROCONF_NAME,
+					SERVICE_NAME);
 
 #ifdef HAVE_AVAHI
 	AvahiInit(loop, serviceName);