master: add cmd line option to dump default config

master/src/cli.rs

@@ -63,6 +63,7 @@ pub fn parse() -> Result<Cli, Error> {
     );
     opts.optopt("p", "port", &port_help, "PORT");
     opts.optopt("c", "config", "config path", "PATH");
+    opts.optflag("", "dump-config", "print default config");
     opts.optopt("s", "stats-format", "stats format string", "FMT");
     opts.optopt("I", "stats-interval", "stats interval", "SECONDS");
 
@@ -78,6 +79,11 @@ pub fn parse() -> Result<Cli, Error> {
         process::exit(0);
     }
 
+    if matches.opt_present("dump-config") {
+        println!("{}", include_str!("../config/default.toml"));
+        process::exit(0);
+    }
+
     if let Some(value) = matches.opt_str("log") {
         match config::parse_log_level(value.as_ref()) {
             Some(level) => cli.log_level = Some(level),