feat(coco): support for init subcommand

src/bin/coco.rs

@@ -1,4 +1,5 @@
-use std::env;
+use std::fs::OpenOptions;
+use std::{env, io::Write};
 
 use clap::{App, Arg};
 
@@ -22,8 +23,28 @@ fn main() {
                 .help("config file")
                 .takes_value(true),
         )
+        .subcommand(
+            App::new("init")
+                .version(VERSION)
+                .author("Inherd Group")
+                .about("A DevOps Efficiency Analysis and Auto-suggestion Tool."),
+        )
         .get_matches();
 
+    if matches.is_present("init") {
+        println!("creating coco.yml");
+        match OpenOptions::new()
+            .write(true)
+            .create_new(true)
+            .open("coco.yml")
+            .map(|mut file| file.write(&serde_yaml::to_vec(&CocoConfig::default()).unwrap()))
+        {
+            Ok(_) => println!("success created"),
+            Err(_) => println!("coco.yml already exists"),
+        }
+        std::process::exit(0);
+    }
+
     let config_file = matches.value_of("config").unwrap_or("coco.yml");
 
     let cli_option = CocoCliOption::default();