--- a/src/main.rs	Tue Oct 27 17:17:24 2020 +0900
+++ b/src/main.rs	Wed Oct 28 16:32:25 2020 +0900
@@ -3,6 +3,7 @@
 use std::process::Command;
 
 #[derive(Clap)]
+#[clap(version = "1.0", author = "AnaTofuZ <anatofuz@cr.ie.u-ryukyu.ac.jp>")]
 struct Opts {
     #[clap(subcommand)]
     subcmd: SubCommand,
@@ -12,18 +13,30 @@
 enum SubCommand {
     define(Define),
     shutdown(Shutdown),
+    list(List),
 }
 
+/// define (but don't start) a domain from an template XML file
 #[derive(Clap)]
 struct Define {
     name: String,
 }
 
+/// gracefully shutdown a domain
 #[derive(Clap)]
 struct Shutdown {
     name: String,
 }
 
+/// list domains
+#[derive(Clap)]
+struct List {}
+
+struct list_dump_msg {
+    info_msg: String,
+    border_line: String,
+}
+
 struct VM {
     id: u32,
     name: String,
@@ -31,28 +44,26 @@
 }
 
 fn main() {
+    let opts: Opts = Opts::parse();
+
     let uid = getuid();
     let gid = getgid();
     let user_name = getlogin(uid);
     println!("uid: {} gid: {} name: {}", uid, gid, user_name);
 
-    let matches = App::new("ie-virsh")
-        .version("1.0")
-        .author("AnatofuZ <anatofuz@cr.ie.u-ryukyu.ac.jp>")
-        .about("virsh wrapper for ie members")
-        .get_matches();
+    match opts.subcmd {
+        SubCommand::define(name) => {}
+        SubCommand::shutdown(name) => {}
 
-    /*
-    let opts: Opts = Opts::parse();
-
-    match opts.subcmd {
-        SubCommand::define(name) => {
-        },
-        SubCommand::shutdown(name) => {
-
+        SubCommand::list(list) => {
+            set_root_id();
+            let (vm_list, list_dump_msg) = list_command(user_name);
+            println!("{}\n{}", list_dump_msg.info_msg, list_dump_msg.border_line);
+            for vm in vm_list.iter() {
+                println!("{} {}", vm.id, vm.name);
+            }
         }
     }
-    */
 
     //set_root_id();
     //list_command(user_name);
@@ -75,7 +86,7 @@
     return gid_struct.into();
 }
 
-fn list_command(user_name: &'static str) {
+fn list_command(user_name: &'static str) -> (Vec<VM>, list_dump_msg) {
     let output = Command::new("virsh")
         .arg("list")
         .arg("--all")
@@ -83,26 +94,30 @@
         .expect("failed to virsh");
     let virsh_list = String::from_utf8_lossy(&output.stdout);
     let mut virsh_list = virsh_list.split("\n");
+
     let info_msg = virsh_list.next().unwrap();
     let border_line = virsh_list.next().unwrap();
+    let ldump_msg = list_dump_msg {
+        info_msg: String::from(info_msg),
+        border_line: String::from(border_line),
+    };
 
     let virsh_emit_vm_list = virsh_list.filter(|&x| x.contains(user_name));
 
     let mut vm_list: Vec<VM> = Vec::new();
 
-    println!("{}\n{}", info_msg, border_line);
     for emit_vm in virsh_emit_vm_list {
         let mut vm_infos = emit_vm.split(" ");
         let vm_status = vm_infos.next().unwrap();
         let is_vm_running = if vm_status != "-" { true } else { false };
         let name = vm_infos.next().unwrap();
-        let vm = VM {
+        vm_list.push(VM {
             id: 0,
             is_vm_running: is_vm_running,
             name: String::from(name),
-        };
-        vm_list.push(vm);
+        });
     }
+    return (vm_list, ldump_msg);
 }
 
 fn set_root_id() {