feat: register works

src/main.rs

@@ -1,3 +1,30 @@
-fn main() {
-    println!("Hello, world!");
-}
+#[macro_use] extern crate rust_util;
+
+mod cmd;
+mod register;
+mod sign;
+
+use clap::App;
+use cmd::{Command, CommandError};
+use cmd::DefaultCommandImpl;
+
+fn main() -> CommandError {
+    let commands: Vec<Box<dyn Command>> = vec![
+        Box::new(register::CommandImpl),
+        Box::new(sign::CommandImpl),
+    ];
+    let mut app = App::new(env!("CARGO_PKG_NAME"))
+        .version(env!("CARGO_PKG_VERSION"))
+        .about(env!("CARGO_PKG_DESCRIPTION"));
+    app = DefaultCommandImpl::process_command(app);
+    for command in &commands {
+        app = app.subcommand(command.subcommand());
+    }
+    let matches = app.get_matches();
+    for command in &commands {
+        if let Some(sub_cmd_matches) = matches.subcommand_matches(command.name()) {
+            return command.run(&matches, sub_cmd_matches);
+        }
+    }
+    DefaultCommandImpl::run(&matches)
+}