Fixing config values for pruning_history (#2918)

parity/cli/mod.rs

@@ -445,6 +445,20 @@ mod tests {
 		assert_eq!(args.flag_chain, "xyz".to_owned());
 	}
 
+	#[test]
+	fn should_use_config_if_cli_is_missing() {
+		let mut config = Config::default();
+		let mut footprint = Footprint::default();
+		footprint.pruning_history = Some(128);
+		config.footprint = Some(footprint);
+
+		// when
+		let args = Args::parse_with_config(&["parity"], config).unwrap();
+
+		// then
+		assert_eq!(args.flag_pruning_history, 128);
+	}
+
 	#[test]
 	fn should_parse_full_config() {
 		// given

parity/cli/usage.txt

@@ -225,7 +225,7 @@ Footprint Options:
                            auto - use the method most recently synced or
                            default to fast if none synced (default: {flag_pruning}).
   --pruning-history NUM    Set a number of recent states to keep when pruning
-                           is active. [default: {flag_pruning_history}].
+                           is active. (default: {flag_pruning_history}).
   --cache-size-db MB       Override database cache size (default: {flag_cache_size_db}).
   --cache-size-blocks MB   Specify the prefered size of the blockchain cache in
                            megabytes (default: {flag_cache_size_blocks}).