conf: log unused/unknown block parameters

NEWS

@@ -3,6 +3,7 @@ ver 0.16 (20??/??/??)
   - removed support for legacy mixer configuration
 * commands:
   - added new "status" line with more precise "elapsed time"
+* log unused/unknown block parameters
 
 
 ver 0.15 (2009/06/23)

src/conf.c

@@ -188,6 +188,35 @@ void config_global_init(void)
 {
 }
 
+static void
+config_param_check(gpointer data, G_GNUC_UNUSED gpointer user_data)
+{
+	struct config_param *param = data;
+
+	if (!param->used)
+		/* this whole config_param was not queried at all -
+		   the feature might be disabled at compile time?
+		   Silently ignore it here. */
+		return;
+
+	for (unsigned i = 0; i < param->num_block_params; i++) {
+		struct block_param *bp = &param->block_params[i];
+
+		if (!bp->used)
+			g_warning("option '%s' on line %i was not recognized",
+				  bp->name, bp->line);
+	}
+}
+
+void config_global_check(void)
+{
+	for (unsigned i = 0; i < G_N_ELEMENTS(config_entries); ++i) {
+		struct config_entry *entry = &config_entries[i];
+
+		g_slist_foreach(entry->params, config_param_check, NULL);
+	}
+}
+
 void
 config_add_block_param(struct config_param * param, const char *name,
 		       const char *value, int line)

src/conf.h

@@ -100,6 +100,12 @@ struct config_param {
 void config_global_init(void);
 void config_global_finish(void);
 
+/**
+ * Call this function after all configuration has been evaluated.  It
+ * checks for unused parameters, and logs warnings.
+ */
+void config_global_check(void);
+
 void config_read_file(const char *file);
 
 /* don't free the returned value

src/main.c

@@ -322,6 +322,8 @@ int main(int argc, char *argv[])
 
 	state_file_init(config_get_path(CONF_STATE_FILE));
 
+	config_global_check();
+
 	/* run the main loop */
 
 	g_main_loop_run(main_loop);